The hemodynamic and electrophysiological action of the LEFT ATRIUM.
The hemodynamic and electrophysiological action of the HEART ATRIA.
The hemodynamic and electrophysiological action of the RIGHT ATRIUM.
The chambers of the heart, to which the BLOOD returns from the circulation.
Measurement of intracardiac blood flow using an M-mode and/or two-dimensional (2-D) echocardiogram while simultaneously recording the spectrum of the audible Doppler signal (e.g., velocity, direction, amplitude, intensity, timing) reflected from the moving column of red blood cells.
Abnormal cardiac rhythm that is characterized by rapid, uncoordinated firing of electrical impulses in the upper chambers of the heart (HEART ATRIA). In such case, blood cannot be effectively pumped into the lower chambers of the heart (HEART VENTRICLES). It is caused by abnormal impulse generation.
Echocardiography applying the Doppler effect, with velocity detection combined with range discrimination. Short bursts of ultrasound are transmitted at regular intervals and the echoes are demodulated as they return.
An electrical current applied to the HEART to terminate a disturbance of its rhythm, ARRHYTHMIAS, CARDIAC. (Stedman, 25th ed)
Surgical excision (total or partial) of a portion of the pericardium. Pericardiotomy refers to incision of the pericardium.
Contractile activity of the MYOCARDIUM.
Ultrasonic recording of the size, motion, and composition of the heart and surrounding tissues. The standard approach is transthoracic.
Examinations used to diagnose and treat heart conditions.
Ultrasonic recording of the size, motion, and composition of the heart and surrounding tissues using a transducer placed in the esophagus.
The hemodynamic and electrophysiological action of the left HEART VENTRICLE. Its measurement is an important aspect of the clinical evaluation of patients with heart disease to determine the effects of the disease on cardiac performance.
The hemodynamic and electrophysiological action of the HEART VENTRICLES.
The failure by the observer to measure or identify a phenomenon accurately, which results in an error. Sources for this may be due to the observer's missing an abnormality, or to faulty technique resulting in incorrect test measurement, or to misinterpretation of the data. Two varieties are inter-observer variation (the amount observers vary from one another when reporting on the same material) and intra-observer variation (the amount one observer varies between observations when reporting more than once on the same material).
The amount of BLOOD pumped out of the HEART per beat, not to be confused with cardiac output (volume/time). It is calculated as the difference between the end-diastolic volume and the end-systolic volume.
A value equal to the total volume flow divided by the cross-sectional area of the vascular bed.
The movement and the forces involved in the movement of the blood through the CARDIOVASCULAR SYSTEM.
The hemodynamic and electrophysiological action of the right HEART VENTRICLE.
The rights of the individual to cultural, social, economic, and educational opportunities as provided by society, e.g., right to work, right to education, and right to social security.
A condition in which the RIGHT VENTRICLE of the heart was functionally impaired. This condition usually leads to HEART FAILURE or MYOCARDIAL INFARCTION, and other cardiovascular complications. Diagnosis is made by measuring the diminished ejection fraction and a depressed level of motility of the right ventricular wall.
Echocardiography amplified by the addition of depth to the conventional two-dimensional ECHOCARDIOGRAPHY visualizing only the length and width of the heart. Three-dimensional ultrasound imaging was first described in 1961 but its application to echocardiography did not take place until 1974. (Mayo Clin Proc 1993;68:221-40)
Diversion of the flow of blood from the entrance of the right atrium directly to the aorta (or femoral artery) via an oxygenator thus bypassing both the heart and lungs.
Abnormally low BODY TEMPERATURE that is intentionally induced in warm-blooded animals by artificial means. In humans, mild or moderate hypothermia has been used to reduce tissue damages, particularly after cardiac or spinal cord injuries and during subsequent surgeries.
Observation of a population for a sufficient number of persons over a sufficient number of years to generate incidence or mortality rates subsequent to the selection of the study group.
Developmental abnormalities in any portion of the ATRIAL SEPTUM resulting in abnormal communications between the two upper chambers of the heart. Classification of atrial septal defects is based on location of the communication and types of incomplete fusion of atrial septa with the ENDOCARDIAL CUSHIONS in the fetal heart. They include ostium primum, ostium secundum, sinus venosus, and coronary sinus defects.
Intellectual or mental process whereby an organism obtains knowledge.
Disturbances in mental processes related to learning, thinking, reasoning, and judgment.
A procedure to stop the contraction of MYOCARDIUM during HEART SURGERY. It is usually achieved with the use of chemicals (CARDIOPLEGIC SOLUTIONS) or cold temperature (such as chilled perfusate).
The time span between the beginning of physical activity by an individual and the termination because of exhaustion.
Echocardiography applying the Doppler effect, with the superposition of flow information as colors on a gray scale in a real-time image.
Physical activity which is usually regular and done with the intention of improving or maintaining PHYSICAL FITNESS or HEALTH. Contrast with PHYSICAL EXERTION which is concerned largely with the physiologic and metabolic response to energy expenditure.
The volume of the HEART, usually relating to the volume of BLOOD contained within it at various periods of the cardiac cycle. The amount of blood ejected from a ventricle at each beat is STROKE VOLUME.
A pathological constriction that can occur above (supravalvular stenosis), below (subvalvular stenosis), or at the AORTIC VALVE. It is characterized by restricted outflow from the LEFT VENTRICLE into the AORTA.
Use or insertion of a tubular device into a duct, blood vessel, hollow organ, or body cavity for injecting or withdrawing fluids for diagnostic or therapeutic purposes. It differs from INTUBATION in that the tube here is used to restore or maintain patency in obstructions.
The downward displacement of the cuspal or pointed end of the trileaflet AORTIC VALVE causing misalignment of the cusps. Severe valve distortion can cause leakage and allow the backflow of blood from the ASCENDING AORTA back into the LEFT VENTRICLE, leading to aortic regurgitation.
Pathological condition characterized by the backflow of blood from the ASCENDING AORTA back into the LEFT VENTRICLE, leading to regurgitation. It is caused by diseases of the AORTIC VALVE or its surrounding tissue (aortic root).
Presence of fluid in the pleural cavity resulting from excessive transudation or exudation from the pleural surfaces. It is a sign of disease and not a diagnosis in itself.
Blood tests that are used to evaluate how well a patient's liver is working and also to help diagnose liver conditions.
The production of adhesions between the parietal and visceral pleura. The procedure is used in the treatment of bronchopleural fistulas, malignant pleural effusions, and pneumothorax and often involves instillation of chemicals or other agents into the pleural space causing, in effect, a pleuritis that seals the air leak. (From Fishman, Pulmonary Diseases, 2d ed, p2233 & Dorland, 27th ed)
Presence of fluid in the PLEURAL CAVITY as a complication of malignant disease. Malignant pleural effusions often contain actual malignant cells.
Finely powdered native hydrous magnesium silicate. It is used as a dusting powder, either alone or with starch or boric acid, for medicinal and toilet preparations. It is also an excipient and filler for pills, tablets, and for dusting tablet molds. (From Merck Index, 11th ed)
Inflammation of the PERICARDIUM that is characterized by the fibrous scarring and adhesion of both serous layers, the VISCERAL PERICARDIUM and the PARIETAL PERICARDIUM leading to the loss of pericardial cavity. The thickened pericardium severely restricts cardiac filling. Clinical signs include FATIGUE, muscle wasting, and WEIGHT LOSS.
Pathological processes of the LIVER.
The restoration of the sequential order of contraction and relaxation of the HEART ATRIA and HEART VENTRICLES by atrio-biventricular pacing.
Backflow of blood from the LEFT VENTRICLE into the LEFT ATRIUM due to imperfect closure of the MITRAL VALVE. This can lead to mitral valve regurgitation.
Regulation of the rate of contraction of the heart muscles by an artificial pacemaker.
A potent natriuretic and vasodilatory peptide or mixture of different-sized low molecular weight PEPTIDES derived from a common precursor and secreted mainly by the HEART ATRIUM. All these peptides share a sequence of about 20 AMINO ACIDS.
A complex of ferric oxyhydroxide with dextrans of 5000 to 7000 daltons in a viscous solution containing 50 mg/ml of iron. It is supplied as a parenteral preparation and is used as a hematinic. (Goodman and Gilman's The Pharmacological Basis of Therapeutics, 8th ed, p1292)
A hormone secreted by the ADRENAL CORTEX that regulates electrolyte and water balance by increasing the renal retention of sodium and the excretion of potassium.
An element in the alkali metals family. It has the atomic symbol Li, atomic number 3, and atomic weight [6.938; 6.997]. Salts of lithium are used in treating BIPOLAR DISORDER.
Cell surface proteins that bind ATRIAL NATRIURETIC FACTOR with high affinity and trigger intracellular changes influencing the behavior of cells. They contain intrinsic guanylyl cyclase activity.
A highly specific (Leu-Leu) endopeptidase that generates ANGIOTENSIN I from its precursor ANGIOTENSINOGEN, leading to a cascade of reactions which elevate BLOOD PRESSURE and increase sodium retention by the kidney in the RENIN-ANGIOTENSIN SYSTEM. The enzyme was formerly listed as EC
A PEPTIDE of 22 amino acids, derived mainly from cells of VASCULAR ENDOTHELIUM. It is also found in the BRAIN, major endocrine glands, and other tissues. It shares structural homology with ATRIAL NATRIURETIC FACTOR. It has vasorelaxant activity thus is important in the regulation of vascular tone and blood flow. Several high molecular weight forms containing the 22 amino acids have been identified.

Regional differences in the recovery course of tachycardia-induced changes of atrial electrophysiological properties. (1/150)

BACKGROUND: Regional differences in recovery of tachycardia-induced changes of atrial electrophysiological properties have not been well studied. METHODS AND RESULTS: In the control group (5 dogs), atrial effective refractory period (AERP) and inducibility of atrial fibrillation (AF) were assessed before and every 4 hours for 48 hours after complete atrioventricular junction (AVJ) ablation with 8-week VVI pacing. In experimental group 1 (15 dogs), AERP and inducibility of AF were assessed before and after complete AVJ ablation with 8-week rapid right atrial (RA) pacing (780 bpm) and VVI pacing. In experimental group 2 (7 dogs), AERP and inducibility of AF were assessed before and after 8-week rapid left atrial (LA) pacing and VVI pacing. AERP and inducibility and duration of AF were obtained from 7 epicardial sites. In the control group, atrial electrophysiological properties obtained immediately and during 48-hour measurements after pacing did not show any change. In the 2 experimental groups, recovery of atrial electrophysiological properties included a progressive recovery of AERP shortening, recovery of AERP maladaptation, and decrease of duration and episodes of reinduced AF. However, recovery of shortening and maladaptation of AERP and inducibility of AF was slower at the LA than at the RA and Bachmann's bundle. CONCLUSIONS: The LA had a slower recovery of tachycardia-induced changes of atrial electrophysiological properties, and this might play a critical role in initiation of AF.  (+info)

Influence of right atrial pressure on the cardiac pacemaker response to vagal stimulation. (2/150)

We have recently shown that the intrinsic rate response to an increase in right atrial pressure is augmented when cardiac muscarinic receptors are activated. This present study examines the cardiac pacemaker response to vagal stimulation at different values of right atrial pressure in isolated rat right atrium and in the rabbit heart in situ. In the rat atrium, when pressure was raised in steps from 2 to 10 mmHg, there was a progressive reduction in the response to vagal stimulation [40.5 +/- 7.2% reduction (mean +/- SE) at 8 mmHg, P < 0.01], which was independent of the level of vagal bradycardia, that persisted in the presence of the beta-adrenergic agonist isoproterenol. In barbiturate-anesthetized rabbits with cervical vagi cut and beta-adrenergic blockade, raising right atrial pressure approximately 2.5 mmHg by blood volume expansion reduced the bradycardia elicited by electrical stimulation of the peripheral end of the right vagus nerve (9.1 +/- 1.1% reduction, P < 0.0001). These results demonstrate that vagal bradycardia is modulated by the level of right atrial pressure and suggest that normally right atrial pressure may interact with cardiac vagal activity in the control of heart rate.  (+info)

Effects of Saiko-ka-ryukotsu-borei-to, a Japanese Kampo medicine, on tachycardia and central nervous system stimulation induced by theophylline in rats and mice. (3/150)

Effects of Saiko-ka-ryukotsu-borei-to (SRBT) on theophylline-induced tachycardia in anesthetized rats and theophylline-induced locomotion and convulsions in mice were examined. An intraduodenal administration of SRBT (1 g/kg) prevented theophylline (5 mg/kg, i.v.)-induced tachycardia in rats. SRBT also attenuated an increase in arterial blood pressure with a slow reduction in heart rate of rats treated with theophylline, with no influence on the plasma level of theophylline. However, SRBT did not change the beating rate of right atrium isolated from rats in the absence or presence of theophylline or isoproterenol. The locomotor activity of theophylline in mice was reduced by the treatment with SRBT. Furthermore, the latency of convulsions in mice induced by administration of theophylline at a higher dose (240 mg/kg, i.p.) was prolonged by treatment with SRBT (1 g/kg, p.o.) and seven out of fifteen mice were saved from death due to convulsions. These results suggest that theophylline-induced tachycardia and central nervous stimulation are suppressed by SRBT and that SRBT may reduce the undesirable actions of theophylline on the cardiovascular and central nervous systems.  (+info)

Rate-dependent conduction block of the crista terminalis in patients with typical atrial flutter: influence on evaluation of cavotricuspid isthmus conduction block. (4/150)

BACKGROUND: The crista terminalis (CT) has been identified as the posterior boundary of typical atrial flutter (AFL) in the lateral wall (LW) of the right atrium (RA). To study conduction properties across the CT, rapid pacing was performed at both sides of the CT after bidirectional conduction block was achieved in the cavotricuspid isthmus by radiofrequency catheter ablation. METHODS AND RESULTS: In 22 patients (aged 61+/-7 years) with AFL (cycle length, 234+/-23 ms), CT was identified during AFL by double electrograms recorded between the LW and posterior wall (PW). After the ablation procedure, decremental pacing trains were delivered from 600 ms to 2-to-1 local capture at the LW and PW or coronary sinus ostium (CSO). At least 5 bipolar electrograms were recorded along the CT from the high to the low atrium next to the inferior vena cava. No double electrograms were recorded during sinus rhythm in that area. Complete transversal conduction block all along the CT (detected by the appearance of double electrograms at all recording sites and craniocaudal activation sequence on the side opposite to the pacing site) was observed in all patients during pacing from the PW or CSO (cycle length, 334+/-136 ms), but it was fixed in only 4 patients. During pacing from the LW, complete block appeared at a shorter pacing cycle length (281+/-125 ms; P<0.01) and was fixed in 2 patients. In 3 patients, complete block was not achieved. CONCLUSIONS: These data suggest the presence of rate-dependent transversal conduction block at the crista terminalis in patients with typical AFL. Block is usually observed at longer pacing cycle lengths with PW pacing than with LW pacing. This difference may be a critical determinant of the counterclockwise rotation of typical AFL.  (+info)

Free-floating thrombi in the right heart: diagnosis, management, and prognostic indexes in 38 consecutive patients. (5/150)

BACKGROUND: Floating right heart thrombi (FRHTS) are a rare phenomenon, encountered almost exclusively in patients with suspected or proven pulmonary embolism and diagnosed by transthoracic echocardiography. Their management remains controversial. METHODS AND RESULTS: We report on a series of 38 consecutive patients encountered over the past 12 years. Thirty-two patients were in NYHA class IV, 20 in cardiogenic shock. Echocardiography usually demonstrated signs of cor pulmonale: right ventricular overload (91.7% of the population), paradoxical interventricular septal motion (75%), and pulmonary hypertension (86. 1%). The thrombus was typically wormlike (36 of 38 patients). It extended from the left atrium through a patent foramen ovale in 4 patients. Pulmonary embolism was confirmed in all but 1. Mortality was high (17 of 38 patients) irrespective of the therapeutic option chosen: surgery (8 of 17), thrombolytics (2 of 9), heparin (5 of 8), or interventional percutaneous techniques (2 of 4). The in-hospital mortality rate was significantly linked with the occurrence of cardiac arrest. Conversely, the outcome after discharge was usually good, because 18 of 21 patients were still alive 47.2 months later (range, 1 to 70 months). CONCLUSIONS: Severe pulmonary embolism was the rule in our series of FRHTS (mortality rate, 44.7%). The choice of therapy had no effect on mortality. Emergency surgery is usually advocated. However, thrombolysis is a faster, readily available treatment and seems promising either as the only treatment or as a bridge to surgery. In patients with contraindications to surgery or lytic therapy, interventional techniques may be proposed.  (+info)

Short-term effect of atrial fibrillation on atrial contractile function in humans. (6/150)

BACKGROUND: Conversion of chronic atrial fibrillation (AF) is associated with atrial stunning, but the short-term effect of a brief episode of AF on left atrial appendage (LAA) emptying velocity is unknown. The purpose of this study was to determine whether a short episode of AF affects left atrial function and whether verapamil modifies this effect. METHODS AND RESULTS: The subjects of this study were 19 patients without structural heart disease undergoing an electrophysiology procedure. In 13 patients, LAA emptying velocity was measured by transesophageal echocardiography in the setting of pharmacological autonomic blockade before, during, and after a short episode of AF. During sinus rhythm, the baseline LAA emptying velocity was measured 5 times and averaged. AF was then induced by rapid right atrial pacing. After either spontaneous or electrical conversion, LAA emptying velocity was measured immediately on resumption of sinus rhythm and every minute thereafter. The mean duration of AF was 15.3+/-3.8 minutes. The mean baseline emptying velocity was 70+/-20 cm/s. The first post-AF emptying velocity was 63+/-20 cm/s (P=0.02 versus baseline emptying velocity). The post-AF emptying velocity returned to the baseline emptying velocity value after 3.0 minutes. The mean percent reduction in post-AF emptying velocity was 9.7+/-21% (range, 15% increase to 56% decrease). A second group of 6 patients were pretreated with verapamil (0.1-mg/kg IV bolus followed by an infusion of 0.005 mg. kg-1. min-1). In these patients, the first post-AF emptying velocity, 58+/-14 cm/s, was not significantly different from the pre-AF emptying velocity, 60+/-13 cm/s (P=0.08). CONCLUSIONS: In humans, several minutes of AF may be sufficient to induce atrial contractile dysfunction after cardioversion. When atrial contractile dysfunction occurs, there is recovery of AF within several minutes. AF-induced contractile dysfunction is attenuated by verapamil and may be at least partially mediated by cellular calcium overload.  (+info)

Functional studies in atrium overexpressing A1-adenosine receptors. (7/150)

1. Adenosine and the A1-adenosine receptor agonist R-PIA, exerted a negative inotropic effect in isolated, electrically driven left atria of wild-type mice. 2. In left atria of mice overexpressing the A1-adenosine receptor, adenosine and R-PIA exerted a positive inotropic effect. 3. The positive inotropic effect of adenosine and R-PIA in transgenic atria could be blocked by the A1-adenosine receptor antagonist DPCPX. 4. In the presence of isoprenaline, adenosine exerted a negative inotropic effect in wild-type atria but a positive inotropic effect in atria from A1-adenosine receptor overexpressing mice. 5. The rate of beating in right atria was lower in mice overexpressing A1-adenosine receptors compared with wild-type. 6. Adenosine exerted comparable negative chronotropic effects in right atria from both A1-adenosine receptor overexpressing and wild-type mice. 7. A1-adenosine receptor overexpression in the mouse heart can reverse the inotropic but not the chronotropic effects of adenosine, implying different receptor-effector coupling mechanisms.  (+info)

Calf blood flow during prolonged tilt in idiopathic dilated cardiomyopathy and after cardiac transplantation. (8/150)

In severe congestive heart failure (CHF), abnormal reflex control of calf blood flow during brief head-up tilt that appears to normalize after transplantation (HTX) may be present during prolonged observation also. Therefore, we studied the effect of prolonged (30 min) 50 degrees head-up tilt on calf skeletal muscle blood flow measured by the local (133)Xe washout method in CHF and after HTX and in patients with the presence vs. absence of native right atrium (+PNA and -PNA, respectively). During brief head-up tilt, skeletal muscle blood flow increased 13 +/- 42% in 9 severe CHF patients in contrast to a -28 +/- 22% decrease (P < 0.01) in 11 control subjects, -24 +/- 30% decrease in 15 moderate CHF patients (P < 0.05), -25 +/- 14% decrease in 12 patients with recent HTX (P < 0.01), and -21 +/- 24% decrease in 8 patients with distant HTX (P = 0.06). However, during sustained tilt, blood flow declined to similar levels of that in the other groups in severe CHF. HTX -PNA vs. +PNA showed blunted skeletal muscle vasomotor control (P < 0.05) and a higher systolic blood pressure (139 +/- 14 vs. 125 +/- 15 mmHg, P < 0.05) and heart rate (92 +/- 10 vs. 83 +/- 8 beats/min, P < 0.05). Thus paradox vasodilatation of calf skeletal muscle in severe CHF is present only during brief but not prolonged tilt. This may be one explanation of the rare presence of orthostatic intolerance in CHF and implies only a minor possible role for the abnormality in edema pathogenesis. Removal of all right atrium in HTX has an important hemodynamic impact that may possibly affect later clinical outcome.  (+info)

Right atrial enlargement is less common, and harder to delineate on chest radiograph, than left atrial enlargement. Pathology Causes Enlargement of the right atrium can result from a number of conditions, including: raised right ventricular p...
Defective conduit function of the oesophagus readily induces clinical symptoms and may have serious effects on nutrition and the lungs, the latter resulting from aspiration of gastro-oeophageal contents. Oesophageal pain and dysphagia caused by benign or malignant diseases of the muscular layer or epithelium are often disabling....
TY - JOUR. T1 - Echocardiographic assessment of estimated right atrial pressure and size predicts mortality in pulmonary arterial hypertension. AU - Austin, Christopher. AU - Alassas, Khadija. AU - Burger, Charles. AU - Safford, Robert. AU - Pagan, Ricardo. AU - Duello, Katherine. AU - Kumar, Preetham. AU - Zeiger, Tonya. AU - Shapiro, Brian. N1 - Funding Information: Other contributions: The work was performed at Mayo Clinic, Jacksonville, FL. We thank the Center for Translational Science Activities grant support (UL1 TR000135) for assistance with this study.. PY - 2015/1/1. Y1 - 2015/1/1. N2 - Background: Elevated mean right atrial pressure (RAP) measured by cardiac catheterization is an independent risk factor for mortality. Prior studies have demonstrated a modest correlation with invasive and noninvasive echocardiographic RAP, but the prognostic impact of estimated right atrial pressure (eRAP) has not been previously evaluated in patients with pulmonary arterial hypertension (PAH). Methods: ...
We evaluated the relationship between susceptibility to arrhythmias caused by right atrial (RA) enlargement and alterations in transmembrane potentials and ultrastructure. RA enlargement was produced in eight dogs (TI) by excising the septal cusp of the tricuspid valve through a right atriotomy and constricting the pulmonary artery. This procedure resulted in RA dilation and hypertrophy. Four sham-operated dogs (S) also were studied. Neither TI nor S dogs developed spontaneous atrial arrhythmias. Atrial overdrive (OD) and premature stimulation (PS) were used to initiate and terminate arrhythmias. At 2 weeks and for 20 to 30 weeks after surgical preparation, TI dogs were more susceptible to arrhythmias than S dogs. The duration of arrhythmias exceeded 10 minutes more often in TI dogs than in S dogs. Sixty-one percent of all arrhythmias in the TI dogs had rates of 320-450 impulses/min, and electrogram and ECG characteristics of atrial flutter (type II rhythm), whereas no S dogs developed rhythms ...
Based on observations that as cardiac output (as determined by an artificial pump) was experimentally increased the right atrial pressure decreased, Arthur Guyton and coworkers proposed an interpretation that right atrial pressure represents a back p
Catchable fatal error: Object of class WP_Error could not be converted to string in /home/lawrence/public_html/wp-content/themes/conduit/functions/breadcrumbs.php on line 68 ...
Four countries where pot is very well tolerated-and one surprising place where its completely legal. (Hint: Its not the Netherlands.)
1Democritus University of Thrace, Dept. of Cardiology, Greece; 2The Ohio State University, Columbus, OH, USA; 3Foundation of Biomedical Research, Academy of Athens, Greece. Increased Right Atrial Volume Index Predicts Low Duke Activity Status Index in Patients with Chronic Heart Failure [PDF] ...
In a patient with diminished right-sided cardiac output or high right atrial pressure, once the contrast material is injected there is reflux of contrast material into the inferior vena cava and hepatic veins. This is one of the radiographic feat...
The present study investigates for the first time the relationship of LA volumes and reservoir function with subclinical cerebrovascular disease. We demonstrated that greater LA volumes and smaller LA reservoir function are associated with SBI and WMHV. In addition, we showed that LAVmin is a stronger predictor of silent cerebrovascular lesions than the commonly used LAVmax, and that its significant association with subclinical brain disease persisted after controlling for potential confounders and risk factors.. The mechanisms linking an increase in LA volume with cerebrovascular disease are not completely understood, but it is reasonable to hypothesize that the mechanisms suggested for the relationship between LA size and stroke may, at least in part, apply to silent cerebrovascular disease as well. This is biologically plausible considering that: 1) subjects with subclinical brain lesions are more likely to experience an overt cerebrovascular event; and 2) subclinical and overt ...
Detecting left atrial enlargement is frequently suspected in line with the presentation of signs and symptoms of the underlying cardiogenic condition. Once other tests addressing other complications are carried out to assist eliminate any potentially existence-threatening disorders, additional testing searching in the structure from the heart can be achieved to find out if left atrial enlargement exists.. Probably the most generally done test to identify left atrial enlargement is applying imaging methods known as echocardiograms. To control your emotions by utilizing seem waves to consider images of the center structures. Using other imaging tests, namely CT or MRI scans, may also be used to identify left atrial enlargement.. With respect to the underlying condition, treatment will normally follow. For instance, treating high bloodstream pressure calls for the effective use of bloodstream pressure medication for example beta-blockers and diuretics. Also, maintaining a healthy diet plan, ...
This study aimed to assess the changes of RA function in patients with obstructive sleep apnea syndrome (OSAS) using velocity vector imaging (VVI) and to evaluate the application of VVI technology. According to the apnea-hypopnea index (AHI), 71 patients with OSAS were divided into three groups: mild, moderate, and severe. A total of 30 cases of healthy subjects were enrolled as the control group. Digital images of apex four-chamber views were acquired to measure the right atrium (RA) linear dimensions and volume parameters including RA longitudinal diameter (RAL), transverse diameter (RAT), RA maximum volume (Vmax), RA minimum volume (Vmin), right atrial volume before contraction (Vpre). Right atrial volume parameters were corrected by body surface area (VImax, VImin, VIpre). The total right atrial emptying fraction (RATEF), right atrial passive emptying fraction (RAPEF), right atrial active contraction emptying fraction (RAAEF) were calculated. The VVI data measuring right atrial global strain (RA-GLS
We previously reported the use of a catheter system to damage the tricuspid valve and create infectious endocarditis (IE) in an animal model. The current study aims to create a faint IE model suitable for antibiotic prophylaxis using a low bacterial inoculum. We also aim to explore a way to quantitatively assess valvular impairment and to predict the success of the IE models during catheterization. Ninety rabbits were assigned to two groups according to the density of bacteria inoculated (1 × 105 CFU for Group A and 1 × 104 CFU for Group B). A catheter system consisting of a polyethylene catheter and a guide wire were used to damage the valve. The catheter system was passed through the rabbits tricuspid valves under echocardiographic guidance. A pressure transducer was used to assess right atrial pressure (PRA) before and just after valvular damage to calculate the pressure alterations (ΔPRA). The animals in group A and B were divided into 3 subgroups according to the ΔPRA (0-5 mmHg for Groups A1
Vi beskriver en ny intrathorax esophagogastrisk anastomotisk teknikk designet for å skape en stor diameter anastomose samtidig...
نحن نصف رواية داخل الصدر المريء تقنية anastomotic مصممة لخلق anastomosis قطركبير مع الحفاظ في وقت واحد على إمدادات الدم قناة للحد من...
The most common cause of RV failure is LV failure. In a sick patient, atrial flutter is definitely sufficient to result in elevated left sided pressures, with pulmonary edema and then subsequent right sided fluid overload. There are only 4 causes of LV failure: valve (valves were ok), systolic dysfct (it was good enough), diastolic dysfct (no evidence of this) and dysrhythmia (this was present). Turns out it had been present for a week, resulting in slow accumulation of fluid (this also explains the pleural effusions).. Delete ...
ECG: left atrial enlargement answers are found in the Diagnosaurus powered by Unbound Medicine. Available for iPhone, iPad, Android, and Web.
In patients with MS, several studies have demonstrated that LA enlargement is a marker of increased thromboembolic risk (4,6,7,9,11,25,26). However, the great majority of studies considered LA size or volume as an indicator of risk. This study aimed to look specifically at LA shape and not just LAVs and LA function in predicting stroke. As LA dilation may not occur in a uniform fashion, LA shape might be a better measure of the pattern of LA remodeling and a better predictor of embolic risk than absolute LAV.. The results of this study show that the atrial shape adds incremental value in predicting embolic events. Additionally, in agreement with a recently published study (27), we found that LA reservoir function was also associated with an increased risk for ECE. Although the LA has 3 major roles that affect LV filling, its reservoir function represents the most important component of the LA function in MS. LA contractile force cannot overcome the mechanical obstruction across the valve and ...
Figure 3: Cardiac catheterization. Figure 3.1: right atrial pressure waveform with a steep y descent (dashed arrow). Figure 3.2: right ventricular pressure waveform with a dip and plateau sign (solid arrow). Equalization of enddiastolic pressures ...
Article Double potential step chronocoulometric studies to determine the role of thiocyanate in electroanalytical determination of gallium in Pu-Ga and U-Ga alloys. Two rapid, selective and simple methods are developed for the determination of galliu...
Does anyone know what CM is supposed to look like right before you are due to start your period? - what does it look like right before your period starts ...
A cardiac function curve is a graph showing the relationship between right atrial pressure (x-axis) and cardiac output (y-axis). Superimposition of the cardiac function curve and venous return curve is used in one hemodynamic model. It shows a steep relationship at relatively low filling pressures and a plateau, where further stretch is not possible and so increases in pressure have little effect on output. The pressures where there is a steep relationship lie within the normal range of right atrial pressure (RAP) found in the healthy human during life. This range is about -1 to +2 mmHg. The higher pressures normally occur only in disease, in conditions such as heart failure, where the heart is unable to pump forward all the blood returning to it and so the pressure builds up in the right atrium and the great veins. Swollen neck veins are often an indicator of this type of heart failure. At low right atrial pressures this graph serves as a graphic demonstration of the Frank-Starling mechanism, ...
The right atrium is one of the four chambers of the heart. The heart is comprised of two atria and two ventricles. Blood enters the heart through the two atria and exits through the two ventricles. Deoxygenated blood enters the right atrium through the inferior and superior vena cava. The
Hi, new pool owner here. I just recently got a Taylor K2006 test kit and I wanted to post my numbers to see if anyone had any advice. I have an SWG and a 9,400 gallon round above ground pool. FC 10 CC 1 PH 7.4 TA 120 CYA 50 Salt 3300 ppm I didnt get the CH number yet. I recently just got done fighting algae so I know my FC is kind of high right now. The pool is still a little cloudy though.
Whenever we are talking, expressing, sharing anything with other, we think ten time How to share? How to talk? How to to espress? what is the rigth way to express ourself. ?? is it right? is it right??? is it right??? is it right??? Which one is right foramt to express.? There is no rigth formate to express…
สโมสรอินเตอร์ มิลาน ทีมชื่อดังแห่งเวทีกัลโช่ เซเรีย อิตาลี มีข่าวว่าพวกเขาทำการติดต่อไปหา เลโอนาร์โด้ ชาร์ดิม นายใหญ่ของสโมสรอาแอส โมนาโก ทีมในลีกเอิง ฝรั่งเศส เพื่อหวังคว้าตัวมาคุมทีมในซีซั่นหน้า หลังจากที่พวกเขา อดได้ อันโตนิโอ คอนเต้,เมาริซิโอ โปเช็ตติโน่ รวมไปถึง ดีเอโก้ ซิเมโอเน่ แน่นอนแล้ว และทีมงูใหญ่ ...
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Is Rascal Does Not Dream Of Bunny Girl Senpai the most popular anime right now? If you want to know what the hottest current anime is, youve come to the ...
Intracardiac Echocardiography Industry Analysis by Future Market Insights: Covering dominant region, Intracardiac Echocardiography Market growth, competition analysis, & future prospects
TY - JOUR. T1 - Antegrade late diastolic arterial blood flow in the fetus. T2 - Insight into fetal atrial function. AU - Howley, Lisa W.. AU - Yamamoto, Yuka. AU - Sonesson, Sven Erik. AU - Sekar, Priya. AU - Jain, Venu. AU - Motan, Tarek. AU - Savard, Winnie. AU - Wagner, Brandie D.. AU - Trines, Jean. AU - Hornberger, Lisa K.. PY - 2013/6. Y1 - 2013/6. N2 - Objective: The purpose of this study was to examine the presence and frequency of antegrade late diastolic arterial blood flow (ALDAF) in the fetus and to determine its contribution to cardiac output. Study Design: We evaluated the presence of ALDAF in 457 fetal and 21 postnatal echocardiograms. The timing of ALDAF to the ventricular systolic Doppler recording (ALDAF-V) was compared with the mechanical atrioventricular interval and, in neonates, the electrical PR interval. Velocity time integrals of ALDAF and the ventricular systolic Doppler signals were measured, and the percent contribution of ALDAF was calculated. Results: ALDAF was ...
Establishing adequate venous access, in some cases through a central venous catheter, is essential to ensure ease of fluid replacement and adequate monitoring of the patient. In patients with ascites, the elderly patients, and those with associated medical conditions such as ischaemic heart disease, the right atrial pressure may not accurately reflect left sided heart pressures so fluid replacement should be monitored with a Swan- Ganz catheter.. Detailed attention to fluid replacement is important for any gastrointestinal bleed and even more so in patients with established chronic liver disease. These patients may have reduced vascular tone and fail to mobilise pooled venous blood from the splanchnic circulation.3Failure to achieve prompt volume replacement may jeopardise renal and hepatic function, a major factor in the morbidity and mortality associated with a variceal bleed.3It is equally important to avoid overfilling as this may precipitate rebleeding, so the right atrial pressure should ...
Right atrial appendage aneurysm (RAAA) is rare with fewer than 20 cases reported in the literature. We sought to systematically review the published cases of RAAA in terms of demographics, clinical characteristics, treatment, complications, and outco
Download PDF D. Caivano¹, V. Patata¹, F. Birettoni¹, M.E. Giorgi¹, M. Rishniw², F. Porciello¹ ¹University of Perugia, Perugia, Italy ²Veterinary Information Network, Davis, United States of America
Randomized controlled trial of 433 patients at 26 sites randomized to receive therapy guided by clinical assessment and a PAC or clinical assessment alone. The target in both groups was resolution of clinical congestion, with additional PAC targets of a pulmonary capillary wedge pressure of 15 mm Hg and a right atrial pressure of 8 mm Hg. Medications were not specified, but inotrope use was explicitly discouraged. Results: PAC did not significantly affect the primary end point of days alive and out of the hospital during the first 6 months (p = 0.99), mortality (p = 0.35), or number of days hospitalized (p = 0.67). In-hospital adverse events were more common among patients in the PAC group (21.9% vs. 11.5%, p = 0.04), although there were no deaths related to PAC use.. ...
Relationships between P wave dispersion, atrial electromechanical delay, left atrial remodeling, and NT-proBNP levels, in patients with hypertrophic cardiomyopathy. Tuluce K, Ozerkan F, Yakar Tuluce S, Yavuzgil O, Gurgun C, Bilgin M, Kahya Eren N, Kocabas U, Nalbantgil S, Soydas Cinar C. Cardiol J. 2015;22(1):94-100. doi: 10.5603/CJ.a2014.0025. Epub 2014 Mar 27 ...
Doctors give trusted, helpful answers on causes, diagnosis, symptoms, treatment, and more: Dr. Krauser on numbness and tingling on right side of body: Impossible to say without more information. However if it has persisted greater than 2 weeks, it should be evaluated. Could be anything from a temporary viral inflammation to ms, to a brain tumor.
There is no place to take a right, I thought as I tried to navigate My way from the center of my brain back to a world I once knew. If I couldnt take a right I wasnt going to take a left. So I barreled straight ahead Picked up steam and blew out the…
το κείμενο με τίτλο Guided in the right direction σχετίζετε με Τεχνίτη Νοημοσύνη και Ρομποτική
23.12.2012, Brno - Radnice Brno středVánoční hra 20.12.2012, Brno - Klub Leitnerova (14hod.)Vánoční hra18.12.2012, MŠ ...
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Central venous pressure (CVP) is the blood pressure in the venae cavae, near the right atrium of the heart. CVP reflects the amount of blood returning to the heart and the ability of the heart to pump the blood back into the arterial system. CVP is often a good approximation of right atrial pressure (RAP),[1] although the two terms are not identical, as a pressure differential can sometimes exist between the venae cavae and the right atrium. CVP and RAP can differ when arterial tone is altered. This can be graphically depicted as changes in the slope of the venous return plotted against right atrial pressure (where central venous pressure increases, but right atrial pressure stays the same; VR = CVP − RAP).. CVP has been, and often still is, used as a surrogate for preload, and changes in CVP in response to infusions of intravenous fluid have been used to predict volume-responsiveness (i.e. whether more fluid will improve cardiac output). However, there is increasing evidence that CVP, whether ...
Electrical conduction is very rapid and highly anisotropic in atrial fiber bundles, such as the crista terminalis. In contrast to left ventricular myocardium in which the ratio of longitudinal to transverse conduction velocities is approximately 3, propagation velocity in the crista terminalis is approximately 10 times greater in the longitudinal than in the transverse direction. To elucidate potential determinants of these distinct conduction properties, we characterized structural and molecular features of intercellular coupling in the crista terminalis and left ventricular myocardium of the canine heart. Analysis of the number and spatial orientation of myocyte interconnections at gap junctions revealed that a typical left ventricular myocyte was connected to 11.3 +/- 2.2 other myocytes. Approximately equal numbers of connections occurred between ventricular myocytes juxtaposed in side-to-side and end-to-end orientation. In contrast, a typical myocyte of the crista terminalis was connected to ...
TY - JOUR. T1 - Associations of electrocardiographic P-wave characteristics with left atrial function, and diffuse left ventricular fibrosis defined by cardiac magnetic resonance. T2 - The PRIMERI study. AU - Win, Theingi Tiffany. AU - Venkatesh, Bharath Ambale. AU - Volpe, Gustavo J.. AU - Mewton, Nathan. AU - Rizzi, Patricia. AU - Sharma, Ravi K.. AU - Strauss, David G.. AU - Lima, Joao A.. AU - Tereshchenko, Larisa G.. PY - 2015/1/1. Y1 - 2015/1/1. N2 - BACKGROUND: Abnormal P-terminal force in lead V1 (PTFV1) is associated with an increased risk of heart failure, stroke, atrial fibrillation, and death. OBJECTIVE: Our goal was to explore associations of left ventricular (LV) diffuse fibrosis with left atrial (LA) function and electrocardiographic (ECG) measures of LA electrical activity. METHODS: Patients without atrial fibrillation (n = 91; mean age 59.5 years; 61.5% men; 65.9% white) with structural heart disease (spatial QRS-T angle ≥105° and/or Selvester QRS score ≥5 on ECG) but LV ...
Pericardiotomy definition at, a free online dictionary with pronunciation, synonyms and translation. Look it up now!
We know the atrial pressure wave forms vary between right and left atrium .In the right atrium a waves are prominent and taller than v waves, while the reverse is true in left atrium . The reasons for tall left atrial v waves are V waves are passive atrial filling waves and are timed during ventricular…
Question - Tingling sensation on right side of face. What could be causing this issue ?. Ask a Doctor about diagnosis, treatment and medication for Paresthesia, Ask a General & Family Physician
حق الخليطوَأمّا حَقُّ الخَلِيطِ فَأَنْ لا تَغُرَّهُ ولا تَغُشَّهُ ولا تُكَذِبَهُ ولا تُغَفِّلَهُ ولا تَخدَعَهُ ولا تَعمَلْ فِي انتِقَاضِهِ عَمَلَ الْعَدُوِّ الَّذِي لا يُبقِي عَلَى صَاحِبهِ وَإنِ اطْمَأَنَّ إلَيكَ اسْتَقْصَيتَ لَهُ عَلَى نفْسِكَ وَعَلِمْتَ أَنَّ غَبْنَ الْمُسْتَرْسِلِ رِِبًا. ولا قُوَّةَ إلا باللهِ.
How to ensure the right people, with the right skills, are in the right place at the right time A guide to nursing, midwifery and care staffing capacity and capability 1 Contents Foreword Expectations
There is so much going on right now, but Im having a seriously why me night. Ive been crying on an off all day and everytime I get better something knocks me right back. I saw this video tonight for the first time and of course, I bawl like a big baby everytime I see…
Who has the right to lay the blame on me that I am not healed ?? Who has the right to scream at me in therapy or even have me taken to a whore house...
ANSWER: A third meaning is: doing something. Example: What are you up to right now? So, to answer your second question, it can mean, what are your plans/what are you doing today, although it sounds more natural to use it when asking someone what he is doing right now. Up to is common way to ask
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Associate Professor of Pharmacology and Toxicology Director, Mass Spectrometry Core Facility (MSCF) Associate Director, Mass Spectrometry Resources, Mississippi Center for Heart Research (MCHR) Office: R401 Lab: R402; R416; R417(601) 815-1268EmailCVBibliographyResearch interestsUnderstanding disease models and mechanisms (hypertension, cardiovascular, obesity, diabetes and kidney disease)Characterization of biomarkers in human illness/diseaseUnderstanding and preventing adverse drug responses (ADRs)Disparities in health and treatment outcomesPharmacokinetics/pharmacodynamics/drug metabolismAlcohol/drug-induced hepatotoxicity mechanismsProteomics/peptidomics/lipidomics/metabolomicsMass spectrometry: methods, data collection and analysisUMMC Mass Spectrometry Core Facility (MSCF)Current researchMy research interests are in understanding the dynamic interplay between protein structure and conformation and how this is manifested in protein function. Cytochrome P450s became my research focus while at the
August, 2008. ABOUT ME: Sometimes without impetus, I move to the middle of our living room floor and do gymnastics. I dont think Ive successfully done a back walkover since I was sixteen, or even a back bend for that matter, but hand stands, splits (sort of), pirouettes, anything that my timber body can handle I attempt. Yes, timber. The opposite of limber. As flexible as a tree trunk. One time last year I showed someone in the hallway of our office how to do a round-off even though I hadnt done one in probably a bakers dozen of years. I also wore my triathlon wetsuit to the office because I was dared. Everything is funnier when someones wearing a wetsuit. The wetsuit and the round-off occurred on different days, but next time that might not be the case.. I am a licensed speech-language pathologist, which Im pretty sure means, based on initial letter, that I can wear the same logo as Superman. In 2004, I moved to Pittsburgh and started school for the 21st time. I am working towards my ...
"Thyroid Function Abnormalities during Amiodarone Therapy for Persistent Atrial Fibrillation". The American Journal of Medicine ... Its primary function is to increase the production of T3 and T4 by the thyroid gland. The most useful marker of thyroid gland ... Thyroid disease is a medical condition that affects the function of the thyroid gland. The thyroid gland is located at the ... There are several hormones that can be measured in the blood to determine how the thyroid gland is functioning. These include ...
"Atrial endocrine function in humans with artificial hearts." ; Schwab T.R., Edwards B.S., DeVries W.C., Zimmerman R.S., Burnett ... February 1987 ; "Artificial Organs" ; PMID 3566584 "A clinical estimation model for noninvasive determination of atrial ...
Normal atrial function is essential for embryogenesis, as inactivation of the MYL7 gene was embryonic lethal at ED10.5-11.5. ... Huang C, Sheikh F, Hollander M, Cai C, Becker D, Chu PH, Evans S, Chen J (December 2003). "Embryonic atrial function is ... Atrial Light Chain-1 (ALC-1), also known as Essential Light Chain, Atrial is a protein that in humans is encoded by the MYL4 ... Shift in atrial myosin heavy chains and in ventricular myosin light chains" (PDF). European Heart Journal. 5 Suppl F: 85-93. ...
... has exactly the opposite function of the atrial natriuretic hormone secreted by the heart. Aldosterone is part of ... The amount of plasma renin secreted is an indirect function of the serum potassium as probably determined by sensors in the ... Aldosterone levels vary as an inverse function of sodium intake as sensed via osmotic pressure. The slope of the response of ... they share 11β-hydroxylation and 18-hydroxylation functions), but aldosterone synthase is also able to perform an 18-oxidation ...
The discovery of right atrial mechanical function is a pivotal discovery in his medical research work. He is an editor for the ... He is best known for his discovery of the mechanical function of atrial chambers of the heart. With experimental evidence on ... atrial fibrillation and in improving the design and functioning of prosthetic hearts. Rai captained the Bangalore University ... The functioning of the Heart: Dr. Dinker Rai's Discovery- Bhavan's Journal VOL .5:9&10. February 1986 Newspaper Ten Deccan ...
The project was expanded by inviting all HUNT4 participants with atrial fibrillation to measure cardiac function and cardiac ...
... of the bHLH transcription factor Hrt2 in repression of atrial gene expression and maintenance of postnatal cardiac function". ... all notch proteins fail to function properly. As yet, the manner by which the glycosylation of notch affects function is not ... Studies have revealed that both loss- and gain-of-function of the Notch pathway results in defects in AV canal development. In ... The addition of O-fucose by POFUT1 is absolutely necessary for notch function, and, without the enzyme to add O-fucose, ...
Nocturnal atrial fibrillation caused by gain of function mutation in KCND2, encoding pore-forming alpha subunit of the cardiac ... PCCA2 - Progressive Cerebello-Cerebral Atrophy type 2: due to VPS53 mutation, abrogating function of the gARP complex. 1:37 ... "Nocturnal Atrial Fibrillation Caused by Mutation in KCND2, Encoding Pore-Forming (α) Subunit of the Cardiac Kv4.2 Potassium ...
... was Assessment of sino-atrial and atrio-ventricular nodal function in the conscious horse by intra-atrial electrostimulation. ... "Assessment of sino-atrial and atrio-ventricular nodal function in the conscious horse by intra-atrial electrostimulation". ...
Vengen ØA, Ellingsen Ø, Lande K, Ilebekk A. Significance of right atrial function during right sided inotropic stimulation of ... Vengen ØA, Ellingsen Ø, Ilebekk A. Forward diastolic flow in pulmonary artery induced by right atrial contraction of in situ ... Exercise training before cardiac-specific Serca2 disruption attenuates the decline in cardiac function in mice. J Appl Physiol ... He currently participates in the HUNT-3 survey of physical activity, aerobic capacity, and endothelial function in Nord- ...
The AV node connects the atrial and ventricular chambers. It functions to carry the electrical impulse from the atria to the ... Function[edit]. The common ostrich is an endotherm and maintains a body temperature of 38.1-39.7 °C (100.6-103.5 °F) in its ... Kidney function[edit]. Common ostrich kidneys are fairly large, and so are able to hold significant amounts of solutes. Hence, ... The wings also function as stabilizers to give better maneuverability when running. Tests have shown that the wings are ...
Atrial volume receptors Low pressure receptors Heesch, C. M. (December 1999). "Reflexes that control cardiovascular function". ... In people with essential hypertension the baroreceptors and their reflexes change and function to maintain the elevated blood ... the atrial volume receptors). The low-pressure baroreceptors are involved with the regulation of blood volume. The blood volume ... Baroreceptors are integral to the body's function: Pressure changes in the blood vessels would not be detected as quickly in ...
Gu J.Y., Xu J.H., Yu H., Yang Y.Q. (2012). Novel GATA5 loss-of-function mutations underlie familial atrial fibrillation.. ...
... atrial function MeSH G09.330.582.075.100 - atrial function, left MeSH G09.330.582.075.200 - atrial function, right MeSH G09.330 ... ventricular function MeSH G09.330.582.962.800 - ventricular function, left MeSH G09.330.582.962.900 - ventricular function, ...
Effects of balloon mitral valvuloplasty on left atrial function in mitral stenosis as assessed by pressure-area relation. J Am ... Assessment of left atrial pressure-area relation in humans by means of retrograde left atrial catheterization and ... He subsequently made studies on the elastic properties of aorta and the function of left atrium. A large part of his research ... Aortic function in arterial hypertension determined by pressure-diameter relation: Effects of diltiazem. Circulation. 1997 Sep ...
This pause is critical to heart function, as it allows the atrial cardiomyocytes to complete their contraction that pumps blood ... Atrial contraction, also referred to as the "atrial kick," contributes the remaining 20-30 percent of filling. Atrial systole ... Cardiac physiology or heart function is the study of healthy, unimpaired function of the heart: involving blood flow; ... The function of the right heart, is to collect de-oxygenated blood, in the right atrium, from the body via the superior vena ...
... as one has more functioning renal tissue than is needed to survive. Only when the amount of functioning kidney tissue is ... and atrial natriuretic peptide, among others. Filtration, which takes place at the renal corpuscle, is the process by which ... Kidney function is tested by using blood tests and urine tests. The most common blood test are creatinine, urea and ... The urinary tract including the ureters, as well as their function to drain urine from the kidneys, has been described by Galen ...
Prolonged atrial flutter with fast heart rates may lead to decompensation with loss of normal heart function (heart failure). ... Left atrial flutter is considered atypical and is common after incomplete left atrial ablation procedures. Atypical atrial ... Similar to the abnormal heart rhythm atrial fibrillation, atrial flutter also leads to poor contraction of the atrial chambers ... also known as common atrial flutter or typical atrial flutter, has an atrial rate of 240 to 340 beats/minute. However, this ...
... diastolic intervals consist of early rapid filling E-waves followed by diastasis and followed by atrial systole-generated A- ... Parallel to "diastolic function", the term "systolic function" is usually referenced in terms of the left ventricular ejection ... "diastolic function". Unlike "systolic function", which can be simply evaluated by LVEF, there are no established dimensionless ... To better understand diastolic function, it is crucial to realize that the left ventricle is a mechanical suction pump at, and ...
The main function of ANP is causing a reduction in expanded extracellular fluid (ECF) volume by increasing renal sodium ... Atrial natriuretic peptide (ANP) or atrial natriuretic factor (ANF) is a natriuretic peptide hormone secreted from the cardiac ... These cells contain volume receptors which respond to increased stretching of the atrial wall due to increased atrial blood ... ANP is secreted in response to: Stretching of the atrial wall, via Atrial volume receptors Increased Sympathetic stimulation of ...
A cardiac function curve is a graph showing the relationship between right atrial pressure (x-axis) and cardiac output (y-axis ... This allows the heart to cope with the required cardiac output at a relatively low right atrial pressure. We get what is known ... The pressures where there is a steep relationship lie within the normal range of right atrial pressure (RAP) found in the ... Swollen neck veins are often an indicator of this type of heart failure.[citation needed] At low right atrial pressures this ...
Elevated right atrial pressure (>12mmHg), Moderate pulmonary hypertension, Normal systolic function, Poor diastolic function, ... Vasodilators are also typically ineffective because systolic function is usually preserved in cases of RCM. Heart failure ... Patients will demonstrate normal systolic function, diastolic dysfunction, and a restrictive filling pattern. 2-dimensional and ... except in the subgroup of restrictive cardiomyopathy with atrial fibrillation. ...
A stimulant, atrial natriuretic factor (ANF) increases cGMP production in the kidneys, which increases function of the ... The P region functions as a channel gate since it prevents ion permeation in the closed state. The pore may be hindered by ... Their function can be the result of a combination of the binding of cyclic nucleotides (cGMP and cAMP) and either a ... CNG channels have a very complex structure with various subunits and domains that play a critical role in their function. CNG ...
... since these functioned as lightning rods, as was the case of the huge atrial cross of the Convent of San José de los Naturales ... Atrial cross in Tultitlán de Mariano Escobedo, Mexico. Atrial cross in the Cathedral of Mérida, Yucatán. The distances to ... Atrial cross (Spanish: Cruz atrial) is called, in the Mexican Colonial Conventual constructions, the sculptures of crosses ... The atrial crosses are usually placed on a pedestal or socle; they have only the face of Christ, a cartouche with the legend ...
"Atrial Fibrillation and Cognitive Function: JACC Review Topic of the Week". Journal of the American College of Cardiology. 73 ( ... Valvular atrial fibrillation refers to atrial fibrillation attributable to moderate to severe mitral valve stenosis or atrial ... 193,300 with atrial flutter (2015)[10]. Atrial fibrillation (AF or A-fib) is an abnormal heart rhythm (arrhythmia) ... Left atrial appendage occlusion[edit]. There is tentative evidence that left atrial appendage occlusion therapy may reduce the ...
January 2007). "Germline gain-of-function mutations in SOS1 cause Noonan syndrome". Nature Genetics. 39 (1): 70-4. doi:10.1038/ ... This includes pulmonary valvular stenosis (50-60%), atrial septal defects (10-25%), ventricular septal defects (5-20%) and ... Accommodations for lessening handwriting demands will improve performance and save long-term hand function. Periodic follow up ... August 2007). "Germline gain-of-function mutations in RAF1 cause Noonan syndrome". Nature Genetics. 39 (8): 1013-7. doi:10.1038 ...
Less common findings include left ventricular hypertrophy, premature atrial and ventricular contractions, atrial fibrillation, ... Studies of thyroid function and immune parameters in patients with hyperthyroid Graves' disease in remission. Murakami M, ... January 2009). "Thyroid function abnormalities and cognitive impairment in elderly people: results of the Invecchiare in ... In a large population-based study of 2008, the odds of having poorer cognitive function were greater for subclinical ...
... preservation of systolic function, and/or rate control for atrial fibrillation with a rapid ventricular response. Heart Failure ... atrial fibrillation. Digitalis is hence often prescribed for patients in atrial fibrillation, especially if they have been ... It was also approved for the control of ventricular response rate for patients with atrial fibrillation. American College of ... Human newborns, some animals, and patients with chronic heart failure lack well developed and fully functioning sarcoplasmic ...
Ventricular mass and volume increase, which together adversely affect cardiac function. Eventually, diastolic function, or the ... However, atrial natriuretic peptide is thought to be cardio-protective. Remodeling of the heart is evaluated by performing an ... The size and function of the atria and ventricles can be characterized using this test.[citation needed] Many factors influence ... In cardiology, ventricular remodeling (or cardiac remodeling) refers to changes in the size, shape, structure, and function of ...
A balloon atrial septostomy is also done. This ensures that there is enough of a connection between the two atria of the heart ... as a result of the inability of the left heart to pump enough blood to sustain normal organ function. In fetal life, this is ... The atrial septum is removed, the aortic arch is reconstructed to remove any hypoplasia, and then the main pulmonary artery is ...
... atrial myxomas, and blue nevi. NAME refers to nevi, atrial myxoma, myxoid neurofibromas, and ephelides. Testicular cancer, ... Carney complex is most commonly caused by mutations in the PRKAR1A gene on chromosome 17 (17q23-q24) which may function as a ...
Molecular function. • calcium channel activity. • metal ion binding. • voltage-gated ion channel activity. • ion channel ... membrane depolarization during atrial cardiac muscle cell action potential. • cardiac muscle cell action potential involved in ... Structure and function[edit]. This gene encodes an alpha-1 subunit of a voltage-dependent calcium channel. Calcium channels ... Nomenclature and structure-function relationships of voltage-gated calcium channels". Pharmacological Reviews. 57 (4): 411-25. ...
Adrenoceptors: Structure, Function. and Pharmacology. Harwood Academic Publisher, Luxembourg. *^ Kokolus, Kathleen M.; Zhang, ... "Treatment with inverse agonists enhances baseline atrial contractility in transgenic mice with chronic beta2-adrenoceptor ...
Right atrial and right ventricular leads as visualized under x-ray during a pacemaker implant procedure. The atrial lead is the ... Basic functionEdit. Modern pacemakers usually have multiple functions. The most basic form monitors the heart's native ... as in atrial fibrillation. The equivalent atrial pacing mode is AAI or AAIR which is the mode of choice when atrioventricular ... Advancements in functionEdit. Posteroanterior and lateral chest radiographs of a pacemaker with normally located leads in the ...
The gene was identified by positional cloning.[4] The EVC gene maps to the chromosome 4 short arm (4p16). The function of a ... Congenital heart defects (most commonly an atrial septal defect producing a common atrium, occurring in 60% of affected ... and may have served a useful function in defining this then little known condition for the medical profession, as well as the ...
Structure-function relationship in regulation of the energy transfere between mitochondria and ATPases in cardiac cell ( ... Compartmentation of energy metabolism in atrial myocardium of patients undergoing cardiac surgery (kaasautor). // Mol. Cell. ...
Adrenergic storm Alcohol Amphetamine Anaemia Antiarrhythmic agents Anxiety Atrial fibrillation Atrial flutter Atrial ... Unstable means that either important organ functions are affected or cardiac arrest is about to occur. In those that are ... vena cava Atrial fibrillation Atrial flutter AV nodal reentrant tachycardia Accessory pathway mediated tachycardia Atrial ... Atrial fibrillation is one of the most common cardiac arrhythmias. In general, it is an irregular, narrow complex rhythm. ...
Atrial fibrillation[edit]. Atrial fibrillation is one of the most common cardiac arrhythmias. In general, it is an irregular, ... Unstable means that either important organ functions are affected or cardiac arrest is about to occur.[4] ... Sinus tachycardia, which originates from the sino-atrial (SA) node, near the base of the superior vena cava ... Depending on the patient's health and other variables such as medications taken for rate control, atrial fibrillation may cause ...
"Complex" ablations include ablation for arrhythmias such as multifocal atrial tachycardia, atrial fibrillation, and ventricular ... Electrophysiologists are trained in the mechanism, function, and performance of the electrical activities of the heart. ... atrial flutter. These procedures are usually performed using intracardiac catheters (as are used during an electrophysiology ...
... the failure of the electronic functions of his Inspiration closed circuit rebreather (CCR) due to hydrodynamic forces from the ... Atrial septal defect. *Effects of drugs on fitness to dive. *Fitness to dive ...
The AV node connects the atrial and ventricular chambers. It functions to carry the electrical impulse from the atria to the ... Function. The common ostrich is an endotherm and maintains a body temperature of 38.1-39.7 °C (100.6-103.5 °F) in its extreme ... Kidney function. Common ostrich kidneys are fairly large, and so are able to hold significant amounts of solutes. Hence, common ... The wings also function as stabilizers to give better maneuverability when running. Tests have shown that the wings are ...
Atrial fibrillation is often due to serious underlying medical conditions, and should be evaluated by a physician. It is not ... Fibrillation occurs when the heart muscle begins a quivering motion due to a disunity in contractile cell function. ... Atrial fibrillation can also be treated through a procedure, e.g. pulmonary vein isolation. This is performed by a cardiologist ... Depending on the timing, this can produce a sustained abnormal rhythm, such as atrial flutter, a self-limiting burst of ...
pulmonary veins) → left atrium (atrial appendage) → mitral valve → left ventricle → aortic valve (aortic sinus) → (aorta and ... The function of the subvalvular apparatus is to keep the valves from prolapsing into the atria when they close. The subvalvular ... venae cavae, coronary sinus) → right atrium (atrial appendage, fossa ovalis, limbus of fossa ovalis, crista terminalis, valve ... Diastole ends with atrial contraction, which ejects the final 30% of blood that is transferred from the left atrium to the left ...
Ring opening in the indole heterocyclic ring could generate new amine and keto functions. The new quinoline heterocycle would ... In people with atrial fibrillation, conduction defects, or heart block, quinine can cause heart arrhythmias, and should be ... and this nitrogen was then bonded to the acetaldehyde function to yield cinchonaminal. ...
Atrial septostomy. Balloon septostomy. creation of septal defect in heart Blalock-Hanlon procedure. shunt from heart chamber to ...
The liver also has many regulatory functions of the metabolism. An important function is the production and control of bile ... This causes heart muscle cells to secrete the hormone atrial natriuretic peptide (ANP) into the blood. This acts on the kidneys ... Kluge, Matthew J. (2015). Fever: Its Biology, Evolution, and Function. Princeton University Press. p. 57. ISBN 9781400869831.. ... Here blood sugar regulation is unable to function because the beta cells of the pancreatic islets are destroyed and cannot ...
... readily available laboratory tests of thyroid function. Many less severe cases of hypothyroidism went untreated.[citation ... and with higher rates of atrial fibrillation in elderly patients.[citation needed] ...
TIPS has been shown to improve kidney function in patients with hepatorenal syndrome.[8][37][38] Complications of TIPS for ... Effects on renal hemodynamics and atrial natriuretic factor". Gastroenterology. 101 (4): 1060-7. doi:10.1016/0016-5085(91)90734 ... Deteriorating liver function is believed to cause changes in the circulation that supplies the intestines, altering blood flow ... The vasopressin analogue ornipressin was found in a number of studies to be useful in improvement of kidney function in ...
... pulmonary infection or atrial fibrillation, inflammation, longer distances, longer duration of exercise, hard surfaces, ... with consequent loss of lung function. ...
Hemoglobin's function can also be lost by chemically oxidizing its iron atom to its ferric form. This form of inactive ... To improve lung function, doctors frequently place infants at risk of hypoxia inside incubators (also known as humidicribs) ... diseases interfering in lung function resulting in a ventilation-perfusion mismatch, such as a pulmonary embolus, or ... establishing a basis for how oxygen levels affect physiological function.[6][7] ...
The negative chronotropic effects of CCBs make them a commonly used class of agents in individuals with atrial fibrillation or ... Mohanakumar, Sheyanth; Telinius, Niklas; Kelly, Benjamin; Hjortdal, Vibeke (2019-08-20). "Reduced Lymphatic Function ... especially from atrial fibrillation), to prevent peripheral and cerebral vasospasm, and to reduce chest pain caused by angina ... channel poses a threat towards lymphatic removal of interstitial fluid essential for normal lymphatic system functioning.[17] ( ...
FunctionEdit. Major Aorta anatomy displaying Ascending Aorta, Brachiocephalic trunk, Left Common Carotid Artery, Left ... The difference between aortic and right atrial pressure accounts for blood flow in the circulation.[16] When the left ventricle ... The function of the aorta has been documented in the Talmud, where it is noted as one of three major vessels entering or ...
The second chamber functions as a "water seal", which acts as a one way valve allowing gas to escape, but not reenter the chest ... to the retained blood can lead to pleural and pericardial effusions and contribute to the triggering of postoperative atrial ... Alternatively, a large adhesive plaster that functions like a tape bridge may be used.[23] ...
Dynamic surface tensions, i.e. surface tension as a function of time, can be obtained by the maximum bubble pressure apparatus ... Atrial septal defect. *Effects of drugs on fitness to dive. *Fitness to dive ...
Diastole ends with atrial contraction, which ejects the final 30% of blood that is transferred from the left atrium to the left ... The function of the subvalvular apparatus is to keep the valves from prolapsing into the atria when they close. The subvalvular ... This amount of blood is known as the end diastolic volume (EDV), and the mitral valve closes at the end of atrial contraction ... During diastole, a normally-functioning mitral valve opens as a result of increased pressure from the left atrium as it fills ...
The other rare E.C.G. changes include deformity of QRS complexes, prolongation of PR interval, atrial premature beats, and ... Liver function tests. *Serological tests. Management[edit]. This section needs additional citations for verification. Please ... atrial tachycardia. In adults, fatal cases have been reported with a total dose of 0.6 G. or less. The incidence of toxic heart ...
Function[edit]. See also: Circulatory system. Blood vessels function to transport blood. In general, arteries and arterioles ... a b c Anatomy Physiology: The Unity of Form and Function, Saladin, McGraw Hill, 2012 ... Atrial. *Right marginal. *Posterior interventricular. *Left coronary: *Anterior interventricular. *Left circumflex (Left ...
Left atrial contraction (left atrial systole) (during left ventricular diastole) causes added blood to flow across the mitral ... Function[edit]. See also: Heart valves. During left ventricular diastole, after the pressure drops in the left ventricle due to ... pulmonary veins) → left atrium (atrial appendage) → mitral valve → left ventricle → aortic valve (aortic sinus) → (aorta and ... venae cavae, coronary sinus) → right atrium (atrial appendage, fossa ovalis, limbus of fossa ovalis, crista terminalis, valve ...
Intricate regulatory networks determine atrial function. Atrial fibrillation (AF) is the most common sustained arrhythmia, ... Atrial-specific pathways for control of intracellular signaling and myocyte function. Thomas J. Hund1,2,3 and Peter J. Mohler1, ... Atrial function is regulated by a variety of intracellular signaling networks that facilitate rapid communication and ... Cardiac atrial signaling "hubs" regulate local calcium signaling. (A) Schematic of the atrial myocyte TT and AT networks and ...
To obtain normal values for left atrial function noninvasively, volumes of the left atrium and ventricle were calculated in 52 ... Atrial Function*. Cardiac Volume. Echocardiography*. Female. Humans. Male. Middle Aged. Myocardial Contraction. Reference ... These values are similar to those reported in studies in which left atrial function was calculated from contrast angiography.. ... To obtain normal values for left atrial function noninvasively, volumes of the left atrium and ventricle were calculated in 52 ...
Guidelines for the management of atrial fibrillation: the Task Force for the Management of Atrial Fibrillation of the European ... OBJECTIVE: This study aimed to identify novel GATA5 mutations that underlie familial atrial fibrillation. METHODS: A total of ... GATA4 loss-of-function mutations in familial atrial fibrillation. Clin Chim Acta. 2011;412(19-20):1825-30, ... Spontaneous initiation of atrial fibrillation by ectopic beats originating in the pulmonary veins. N Engl J Med. 1998;339(10): ...
Objective: To examine the feasibility of using SI and SR to evaluate phasic atrial function in patients with mild hypertension ... measure regional myocardial deformation and may be a new technique to assess phasic atrial function. ... The following left atrial (LA) volumes were measured: (a) maximal LA volume or Volmax; (b) minimal LA volume or Volmin; (c) ... No significant difference was present in S-Sr, A-Sr or global atrial strain between the normal and HT cohorts. ...
This may either be produced by increased atrial loading and volume or decreased atrial compliance.4 In chronic AF atrial ... In chronic atrial fibrillation (AF) left ventricular function may gradually diminish as a result of an intrinsic ... Factors with potential influence on atrial mechanical function include duration of AF and the properties of the left ventricle- ... In AF increased atrial pressure can be measured. We therefore consider decreased atrial compliance (producing an increased v ...
... and improves left atrial function in patient with mitral stenosis. ... decreases the intensity of spontaneous left atrial contrast, reduces the size of the left atrium, ... and improves left atrial function in patient with mitral stenosis. However, left atrial mechanical functions immediately after ... Left atrial mechanical functions were evaluated before and after PMV, including left atrial passive emptying volume, LA passive ...
... structure and function occur in patients with diastolic heart failure (DHF). The reasons for the transition from asymptomatic ... S), and atrial contraction (LAA) were measured. The ratio of wedge pressure to LAS strain was used as an index of LA stiffness ... Background-Abnormalities in left ventricular (LV) structure and function occur in patients with diastolic heart failure (DHF). ... with no significant difference between patients with DHF and diastolic dysfunction in LA systolic function indices, LV mass, LA ...
Our results indicate that Hrt2 acts in the ventricular myocardium to repress atrial gene expression, thereby functioning as a ... Repression of Atrial Gene Expression by Hrt2.. Based on the up-regulation of multiple atrial genes including Mlc1a, Mlc2a, Sln ... These findings reveal a ventricular myocardial cell-autonomous function for Hrt2 in the suppression of atrial cell identity and ... Repression of Atrial Genes by Hrt2.. To determine whether Hrt2 was sufficient to repress endogenous atrial gene expression, we ...
... Fang Yuan1#, Lan Zhao2#, Juan Wang3, Wei ... PITX2c Loss-of-Function Mutations Responsible for Congenital Atrial Septal Defects. Int J Med Sci 2013; 10(10):1422-1429. doi: ... These findings firstly link PITX2c loss-of-function mutations to atrial septal defects in humans, which provide novel insight ... Atrial myocardium derives from the posterior region of the second heart field, which acquires left-right identity as Pitx2c is ...
M XiaQ JinS BendahhouY HeMM LarroqueY ChenQ ZhouY YangY LiuB LiuA Kir2.1 gain-of-function mutation underlies familial atrial ... Li, J., Liu, W., Yang, Z., Yang, Y.Novel GATA6 loss-of-function mutation responsible for familial atrial fibrillation. ... Li, J., Liu, W., Yang, Z., Yang, Y.Novel GATA6 loss-of-function mutation responsible for familial atrial fibrillation. ... Novel GATA6 loss-of-function mutation responsible for familial atrial fibrillation. *Authors: *Jian Li ...
Cardiopulmonary Bypass to Repair an Atrial Septal Defect Does Not Affect Cognitive Function in Children. Peter L. Stavinoha, ... Cardiopulmonary Bypass to Repair an Atrial Septal Defect Does Not Affect Cognitive Function in Children ... Cardiopulmonary Bypass to Repair an Atrial Septal Defect Does Not Affect Cognitive Function in Children ... Cardiopulmonary Bypass to Repair an Atrial Septal Defect Does Not Affect Cognitive Function in Children ...
However, chronic AF associated with mitral valve disease deteriorates LA mechanical function diffusely throughout the LA wall. ... Multislice computed tomography accurately quantifies left atrial size and function after the MAZE procedure Circulation. 2006 ... Background: Although the MAZE procedure allows for the recovery of sinus rhythm and left atrial (LA) mechanical function in the ... All patients with MAZE were free of AF and other atrial arrhythmias during the follow-up period. In the CABG group, LA maximal ...
Heart Rate Increase Pindolol Cardiac Pacemaker Pump Function Pacemaker Activity These keywords were added by machine and not by ...
Keywords: thyroid function, epicardial fat, atrial fibrillation, causal mediation analysis ... The underlying mechanism of the association between thyroid function and atrial fibrillation (AF) is poorly understood, but ... We report no mediating role of EAT in the association of thyroid function with AF, but found evidence for a suggested ... We found no evidence of a mediating role of EAT in the association of thyroid function with AF (mediated interaction 1.6%, pure ...
... Rundqvist, Louise Jönköping ... 50 mL/m(2) (P amp;lt; 0.001), left atrial volume 27 vs. 19 mL/m(2) (P amp;lt; 0.001), and right ventricular (RV) and right ... The aims of the study were to explore the effects of long-term endurance exercise on atrial and ventricular size and function ... Further, we found improved systolic function in the active group compared with controls: left ventricular ejection fraction 61 ...
Effects of Dronedarone on Cardiac Geometry and Function in Patients With Atrial Fibrillation and Left Atrial Enlargement ( ... left atrial (LA) function was assessed at baseline and after 12 months treatment using 2-D echocardiography and interpreted ... Evaluate the effects of dronedarone versus placebo on left atrial function;. *Evaluate the effects of dronedarone versus ... Changes From Baseline in Left Atrial Function [ Time Frame: baseline (before randomization) and post-baseline (after 3-12 ...
... and Function. Petr Kuchynka,1,2 Jana Podzimkova,1 Martin Masek,3 Lukas Lambert,3 Vladimir Cerny,3 Barbara Danek,1 and Tomas ... atrial fibrillation require the need for detailed knowledge of left atrial and pulmonary venous morphology as well of atrial ... This review article discusses the role of cardiac magnetic resonance and computed tomography in assessment of left atrial size ... The Role of Magnetic Resonance Imaging and Cardiac Computed Tomography in the Assessment of Left Atrial Anatomy, Size, ...
"Right atrial MR imaging studies of cadaveric atrial casts and comparison with right and left atrial volumes and function in ... "Left atrial function and scar after catheter ablation of atrial fibrillation," Heart Rhythm, vol. 5, no. 5, pp. 656-662, 2008. ... "Left atrial transport function in myocardial infarction. Importance of its booster pump function," The American Journal of ... "Assessment of left atrial volume and function in patients with permanent atrial fibrillation: comparison of cardiac magnetic ...
Abstract 13554: Left Atrial Function in Children by Volume and Strain Analysis: Impact of Congenital Aortic Stenosis. Divya ... Background: Left atrial (LA) function by volume and strain analysis in children has been little studied. LA dysfunction related ... Abstract 13554: Left Atrial Function in Children by Volume and Strain Analysis: Impact of Congenital Aortic Stenosis ... Abstract 13554: Left Atrial Function in Children by Volume and Strain Analysis: Impact of Congenital Aortic Stenosis ...
2007) Improvement of atrial function and atrial reverse remodeling after cardiac resynchronization therapy for heart failure. J ... 1) several baseline data concerning atrial function are presented (left atrial volume index and mitral regurgitation severity ... Atrial Function in Patients Undergoing CRT Message Subject (Your Name) has forwarded a page to you from JACC: Cardiovascular ... In recent years, there has been growing interest in the potential impact of CRT on atrial function, but the state of knowledge ...
... bosentan therapy improves ventricular and atrial functions resulting in enhancement of physical exercise and reduction in the ... Effect of bosentan therapy on ventricular and atrial function in adults with Eisenmenger syndrome. A prospective, multicenter ... Conclusions: In adult patients with Eisenmenger syndrome, bosentan therapy improves ventricular and atrial functions resulting ... ventricular and atrial function, and pulmonary hemodynamics. Methods: Forty adult patients before and after 24 weeks bosentan ...
Patients with CHF commonly have atrial fibrillation or flutter (AF), which is frequently associated with, may be a marker for, ... of Atrial Fibrillation or Flutter Whether Systolic Function Is Preserved or Depressed" written by Jacob I. Haft, Louis E. ... Letter by Haft Regarding Article, "High Prevalence of Atrial Fibrillation Among Patients With Ischemic Stroke". Stroke, 2015. ... Letter by Haft Regarding Article,"High Prevalence of Atrial Fibrillation Among Patients With Ischemic Stroke" ...
Patients with CHF commonly have atrial fibrillation or flutter (AF), which is frequently associated with, may be a marker for, ... of Atrial Fibrillation or Flutter Whether Systolic Function Is Preserved or Depressed. World Journal of Cardiovascular Diseases ... of Atrial Fibrillation or Flutter Whether Systolic Function Is Preserved or Depressed ... Stroke Risk in Atrial Fibrillation Working Group (2008) Comparison of 12 Risk Stratification Schemes to Predict Stroke in ...
2012) The impact of atrial fibrillation ablation left atrial function: association with baseline left atrial function. Pacing ... left atrial. LAKE. left atrial kinetic energy. LAV. left atrial volume. LAVi. left atrial volume indexed to body surface area. ... 1999) Left atrial relaxation and left ventricular systolic function determine left atrial reservoir function. Circulation 100: ... atrial function is abnormal in HCM. Increases in booster pump function and impaired reservoir and conduit functions have been ...
Effect of low dose infusion of atrial natriuretic peptide on renal function in man. L. R. Solomon, J. C. Atherton, H. Bobinski ... Effect of low dose infusion of atrial natriuretic peptide on renal function in man ... Effect of low dose infusion of atrial natriuretic peptide on renal function in man ... Effect of low dose infusion of atrial natriuretic peptide on renal function in man ...
Impairment of Pulmonary Function is an Independent Risk Factor for Atrial Fibrillation: The Takahata Study Yoko Shibata1✉, ... Keywords: atrial fibrillation, pulmonary function, general population This is an open access article distributed under the ... Impairment of Pulmonary Function is an Independent Risk Factor for Atrial Fibrillation: The Takahata Study. Int J Med Sci 2011 ... The relationship between the prevalence of AF and pulmonary function is unclear. The aim of this study was to evaluate this ...
... function in success of electrial cardioversion (ECV) in patients with nonvalvular atrial fibrillation (NVAF), and observe the ... of LAA and left atrial spontaneous echo contrast (SEC) of left atrial appendage before ECV and after ECV 24 hours, 3 days and 1 ... thrombogenic milieu Patients with atrial fibrillation should be given full anticoagulation to prevent thrombogenesis in left ... course of the recovery of LAA systaltic function Methods To test blood flow wave patterns, peak emptying velocity (PEV) ...
Aged, Atrial Fibrillation/metabolism/physiopathology/*surgery/ultrasonography, Atrial Function, Atrial Natriuretic Factor/blood ... Atrial function after epicardial microwave ablation in patients with atrial fibrillation. Ahlsson, Anders Örebro University, ... Tissue velocity echocardiography on patients in sinus rhythm showed preserved atrial wall velocities, atrial strain, and atrial ... To study epicardial microwave ablation of concomitant atrial fibrillation and its effects on heart rhythm and atrial function ...
Left atrial myocardial function in either physiological or pathological left ventricular hypertrophy: a two-dimensional speckle ... Left atrial myocardial function in either physiological or pathological left ventricular hypertrophy: a two-dimensional speckle ...
1998) Assessment of left atrial appendage function after cardioversion of atrial fibrillation: relation to left atrial ... 1997) Left atrial chamber and appendage function after internal atrial defibrillation: a prospective and serial transesophageal ... 1994) Left atrial appendage function and thrombus formation in atrial fibrillation-flutter: a transesophageal echocardiographic ... 1993) Impact of electrical cardioversion for atrial fibrillation on left atrial appendage function and spontaneous echo ...
  • Normal left atrial function determined by 2-dimensional echocardiography. (
  • To obtain normal values for left atrial function noninvasively, volumes of the left atrium and ventricle were calculated in 52 volunteers by 2-dimensional echocardiography. (
  • Left Atrial Volume index (LAVi) was assessed at baseline and after 12 months treatment using 2-D echocardiography and interpreted blindly via a central Echocardiography Core Lab. (
  • left atrial (LA) function was assessed at baseline and after 12 months treatment using 2-D echocardiography and interpreted blindly via a central Echocardiography Core Lab. (
  • Maximal left atrial diameter in the anteroposterior dimension was assessed at baseline and after 12 months treatment using 2-D echocardiography and interpreted blindly via a central Echocardiography Core Lab. (
  • Minimum vs. maximum left atrial volume for prediction of first atrial fibrillation or flutter in an elderly cohort: a prospective study," European Journal of Echocardiography , vol. 10, no. 2, pp. 282-286, 2008. (
  • Assessment of left atrial volume and function in patients with permanent atrial fibrillation: comparison of cardiac magnetic resonance imaging, 320-slice multi-detector computed tomography, and transthoracic echocardiography," European Heart Journal Cardiovascular Imaging , vol. 15, no. 5, pp. 532-540, 2014. (
  • Atrial size and function can be assessed with echocardiography, cardiac computed tomography (CCT), and cardiac magnetic resonance (CMR). (
  • Tissue velocity echocardiography on patients in sinus rhythm showed preserved atrial wall velocities, atrial strain, and atrial strain rate. (
  • We evaluated the potential utility of two-dimensional (2D) Strain-Strain rate (S-SR) and 3D echocardiography to quantitatively assess RV, LV and atrial function in ARVC patients (pts), with apparently normal LV. (
  • Our aim was to evaluate volumetric and functional atrial parameters, using real time three-dimensional echocardiography (RT3DE) in women in early and late third trimester of pregnancy. (
  • In patients with a documented sinus rhythm (SR) at follow-up, the presence of atrial transport function was assessed with transthoracic echocardiography. (
  • Left atrial functional indices and measurements obtained from 2-dimensional echocardiography of healthy dogs and dogs with myxomatous mitral valve disease. (
  • And two-dimensional speckle tracking echocardiography (2D-STE) has been reported very useful in evaluating left atrial (LA) function, as well as left ventricular (LV) function. (
  • 90 g/L) and group C (Hb60 ~ 90 g/L). Another 30 healthy people were also selected as control group A. Conventional echocardiography parameters, such as left atrial diameter (LAD), peak E and A of mitralis (E, A), E/A, end-diastolic thickness of ventricular septum (IVST d), end-diastolic thickness of LV posterior wall (PWTd) and left ventricular end-diastolic dimension (LVDd) were obtained from these three groups. (
  • Right atrial function with speckle tracking echocardiography: Do we really need it? (
  • 5 Subsequently, analysis of right atrial (RA) mechanics using two-dimensional (2D) speckle tracking echocardiography (STE) also proved feasible, 6-12 and normal reference values have been published. (
  • RECENT FINDINGS: This article will summarize recent developments in left atrial imaging that play a role in patients with atrial fibrillation, with particular emphasis on echocardiography, and with reference made to important advances in cardiac computed tomography and cardiac magnetic resonance. (
  • Percutaneous closure of the left atrial appendage: The value of real time 3D transesophageal echocardiography and the intraoperative change in the size of the left atrial appendage. (
  • The aim of this study was to investigate the value of real time three-dimensional transesophageal echocardiography (RT3DTEE) in percutaneous closure of the left atrial appendage (LAAC). (
  • Transthoracic echocardiography (TTE) was performed immediately after ablation, then repeated after 1 day, 1 week, and 6 weeks to measure peak transmitral velocities and percent atrial contribution to ventricular filling. (
  • Speckle tracking echocardiography (STE) for two-dimensional (2D) strain analysis is a new tool to assess myocardial function. (
  • Background: Left atrial (LA) strain (ε) and ε rate (SR) analysis by 2-dimensional speckle tracking echocardiography is a novel method for functional assessment of the LA. Objective: The purpose of this study was to determine the impact of left atrial appendage (LAA) exclusion by Lariat epicardial ligation on mechanical function of the LA by performing ε and SR analysis before and after the procedure. (
  • Predictive role of left atrial and ventricular mechanical function in postoperative atrial fibrillation: a two-dimensional speckle-tracking echocardiography study. (
  • Left atrial (LA) function (consisting of 3 phases: reservoir, conduit and booster pump) can be evaluated by speckle tracking echocardiography (STE) which measures myofiber deformation during these phases. (
  • Objectives: To investigate whether there is a relation between mitral annular velocities obtained by Doppler tissue imaging (DTI) and LAA function determined by transoesophageal echocardiography (TEE) and to determine if the annular velocities can predict the presence of the inactive LAA in MS. Methods: Sixty MS patients were evaluated by transthoracic echocardiography and all patients underwent transesophageal echocardiography. (
  • Furthermore, advances in catheter ablation procedures used for the treatment of drug-refractory atrial fibrillation require the need for detailed knowledge of left atrial and pulmonary venous morphology as well of atrial wall characteristics. (
  • Special interest is paid to the utility of these rapidly involving noninvasive imaging methods before and after atrial fibrillation ablation. (
  • OBJECTIVES: To study epicardial microwave ablation of concomitant atrial fibrillation and its effects on heart rhythm and atrial function during follow-up. (
  • and atrial function after concomitant surgical ablation for AF. (
  • This guidance provides FDA's recommendations on clinical trial designs for surgical ablation devices intended for the treatment of atrial fibrillation (AF). (
  • The evidence that these modalities can predict who will develop atrial fibrillation, who will achieve sustained sinus rhythm after cardioversion or catheter ablation, and who will have thromboembolic risk will be reviewed. (
  • Atrioventricular conduction properties in patients with prolonged pauses undergoing ablation of longstanding persistent atrial fibrillation: do pauses during atrial fibrillation matter? (
  • Radiofrequency catheter ablation is not superior to antiarrhythmic drug therapy as first-line treatment in patients with symptomatic paroxysmal atrial fibrillation-but it may be a reasonable alternative. (
  • Little is known on atrial mechanical function and the time course of atrial recovery following radiofrequency ablation of AFI. (
  • Left atrial appendage emptying velocities decreased significantly following AFI termination (44 ± 23 cm/s before ablation vs 25 ± 14 cm/s after ablation, p = 0.01). (
  • Four patients had complete atrial standstill after ablation, and 1 patient developed a new left atrial appendage thrombus. (
  • Thus, atrial stunning occurs after catheter ablation of AFI and may lead to rapid formation of thrombus in the left atrial appendage. (
  • By contrast, novel therapeutic options such as radiofrequency catheter ablation techniques and transcatheter closure of the left atrial appendage (LAA) demand advanced imaging to maximize patient safety and procedural outcomes. (
  • We assessed the effects of catheter ablation of PVCs on parameters of LV diastolic function and LA remodeling. (
  • We also compared the changes in the left atrial volumes and left atrial volume index (LAVI) after PVC ablation. (
  • Conclusion: Catheter ablation of PVCs improved LV diastolic function and resulted in left atrial reverse remodeling. (
  • Catheter ablation for atrial fibrillatio. (
  • It is still unknown whether left ventricular ejection fraction (LVEF) might affect the magnitude of improvement after atrial fibrillation (AF) ablation on cardiac function in persistent or longstanding persistent AF (CAF) patients. (
  • Success rate of one-stop procedure for atrial fibrillation ablation and its impact on cardiac function: a propensity-matched study]. (
  • To investigate the effect of the combination of atrial fibrillation (AF) ablation and left atrial appendage closure (LAAC) on cardiac function and the success rate of AF ablation. (
  • but the improvement of cardiac function was more obvious in the control patients undergoing AF ablation alone (P (
  • The one-stop procedure can improve cardiac function of the patients , but AF ablation alone can achieve better improvement of cardiac function. (
  • Here, we have identified a membrane structure and Ca 2+ -signaling complex that may enhance the speed of atrial contraction independently of phospholamban regulation. (
  • In this issue of the JCI , Brandenburg and colleagues describe the identification and characterization of "super-hub" signaling nodes located on atrial axial tubules that regulate atrial contraction. (
  • Together, the results of this study provide important insight into the regulation of atrial contraction and describe potential therapeutic targets to be explored in future studies. (
  • S ), and atrial contraction (LA A ) were measured. (
  • Additional value of analyzing left atrial size, left atrial ejection fraction and the difference in duration of pulmonary venous and mitral flow velocity at atrial contraction," Journal of the American College of Cardiology , vol. 22, no. 7, pp. 1972-1982, 1993. (
  • All patients in sinus rhythm had preserved left and right atrial-filling waves through atrioventricular valves during atrial contraction. (
  • Strong correlation between ALDAF-V, atrioventricular interval, and electrical PR interval suggests that ALDAF coincides with atrial contraction. (
  • Conclusion: ALDAF results from atrial contraction. (
  • This was mainly achieved by increasing atrial contraction (A-wave), maintaining cardiac output by increasing heart rate. (
  • Left atrial minimum volume (LAVmin), left atrial pre-atrial contraction volume (LAVp) and left atrial maximum volume (LAVmax) were measured by Simpson's rule, whereas left atrial active ejection fraction (LAAEF) and left atrial passive ejection fraction (LAPEF) were obtained from calculation. (
  • Booster pump phase: contributing to RV filling in late diastole by atrial contraction. (
  • The reservoir and conduit phases are often termed passive phases, whereas the atrial contraction phase is considered the active phase. (
  • Maximum, minimum and pre-atrial contraction (pre-A) LA volumes (ml/m2) were 21.2 ± 5.5, 7.8 ± 2.5, and 11.0 ± 3.1, respectively. (
  • LA SR curves were similarly obtained to determine the peak positive strain rate (SRs) during left ventricle systole, the first negative peak strain rate (SRe) during early diastole and the second negative peak strain rate (SRa) during atrial contraction. (
  • Two novel heterozygous GATA5 mutations (p.Y138F and p.C210G) were identified in two of the 110 unrelated atrial fibrillation families. (
  • Right atrial peak strain derived from 2D-STE has been proved to be a reliable tool to study RA performance. (
  • Release of atriopeptin in the rat by vasoconstrictors or water immersion correlates with changes in right atrial pressure. (
  • It can be also estimated using various imaging techniques or other pressure readings such as PULMONARY CAPILLARY WEDGE PRESSURE (an estimate of left atrial pressure) and CENTRAL VENOUS PRESSURE (an estimate of right atrial pressure). (
  • Correlations between right atrial longitudinal strain and other echocardiographic parameters in patients with atrial septal defect. (
  • The aim of this study was to assess right atrial (RA) function using STE in patients with an atrial septal defect (ASD) before and one month after percutaneous closure. (
  • We assessed the real-world effectiveness and safety of edoxaban in atrial fibrillation patients in relation to CrCl. (
  • First, anticoagulation is very important for the long-term kidney health of atrial fibrillation patients," said Dr. Bunch. (
  • Atrial fibrillation patients taking Warfarin, a popular blood-thinning drug, are at higher risk of developing kidney failure if anticoagulation levels are not properly managed, according to a new study from researchers at the Intermountain Medical Center Heart Institute. (
  • The aim of this study was to evaluate the effects of atorvastatin on left atrial (LA) function in paroxysmal atrial fibrillation patients. (
  • Fifty-eight paroxysmal atrial fibrillation patients were divided into two groups (treatment and control groups). (
  • Seventeen patients who had successfully undergone direct current electrical cardioversion for persistent lone AF or atrial flutter were studied. (
  • Patients with CHF commonly have atrial fibrillation or flutter (AF), which is frequently associated with, may be a marker for, and may be the mechanism of, ischemic strokes. (
  • Efficacy of Dofetilide in the Treatment of Atrial Fibrillation-Flutter in Patients With Reduced Left Ventricular Function. (
  • Atrial stunning, as assessed by left atrial appendage emptying and increased spontaneous echo contrast, is known to occur following direct- current cardioversion of atrial fibrillation (AF) and atrial flutter (AFI). (
  • abstract = "PURPOSE OF REVIEW: This review of emerging approaches to left atrial imaging in atrial fibrillation is relevant because there has been considerable recent development in the noninvasive characterization of left atrial structure and function. (
  • As a result, two novel heterozygous PITX2c mutations, p.H98Q and p.M119T, were identified in 2 unrelated patients with atrial septal defects, respectively. (
  • These findings firstly link PITX2c loss-of-function mutations to atrial septal defects in humans, which provide novel insight into the molecular mechanism responsible for CHD, suggesting potential implications for the early prophylaxis and allele-specific treatment of CHD. (
  • Methods and Results- We evaluated neurocognitive function in subjects aged 3 to 17 years both before and after surgical repair of an atrial septal defect (ASD). (
  • Recently, Visconti et al 15 addressed some of these problems by performing a retrospective study in which a group of children who underwent closure of an atrial septal defect (ASD) by surgery were compared with another group of children who underwent ASD closure by a catheter-delivered device. (
  • We therefore performed a prospective observational study in which we evaluated cognitive function in subjects both before and after surgical repair of an atrial septal defect. (
  • In addition, the development of new interventional transcatheter procedures for AF, mitral valve repair, atrial septal defect closure, and LAA occlusion may result in intentional or unintentional instrumentation of the LAA. (
  • Atrial septal defect (ASD) is one of the most common congenital cardiac anomalies presenting in adulthood. (
  • The three major types of atrial septal defect (ostium secundum, ostium primum and sinus venosus) account for 10% of all congenital heart defects and as much as 20-40% of congenital heart disease presenting in adulthood. (
  • Clinical characteristics and echocardiographic measurements in patients with atrial septal defect. (
  • Effects of atrial septal defect closure on echocardiographic parameters. (
  • All patients with MAZE were free of AF and other atrial arrhythmias during the follow-up period. (
  • We believe that their excellent echocardiographic data could also be useful to better understand another debated issue (i.e., the effect of CRT on the risk of the development of atrial arrhythmias) that is clearly related to atrial remodeling ( 4,5 ). (
  • Small spikes in traffic-related smog seem to trigger clinically relevant atrial arrhythmias in patients with known cardiac disease. (
  • We sought whether LA booster pump function was associated with arrhythmias in patients undergoing primary prevention implantable cardioverter-defibrillator (ICD) implantation for non-ischaemic dilated cardiomyopathy (NICM), independent of global longitudinal strain (GLS) and mechanical dispersion (MD). (
  • LA booster pump function was an independent and incremental predictor of arrhythmias in NICM over GLS and MD, and may aid better risk stratification in this population. (
  • BACKGROUND: Impaired left atrial (LA) mechanical function is present in hypertension and likely contributes to various complications, including atrial arrhythmias, stroke, and heart failure. (
  • GATA4 loss-of-function mutations in familial atrial fibrillation. (
  • Novel KCNA5 loss-of-function mutations responsible for atrial fibrillation. (
  • Atrial fibrillation (AF) is a cardiac arrhythmia that arises from electrical and contractile dysfunction in the atria. (
  • The findings expand the spectrum of GATA5 mutations linked to AF and provide novel insights into the molecular mechanism involved in the pathogenesis of atrial fibrillation, suggesting potential implications for the early prophylaxis and personalized treatment of this common arrhythmia. (
  • Atrial fibrillation (AF) is the most common form of cardiac arrhythmia seen in clinical practice, accounting for approximately one-third of hospitalizations for cardiac rhythm disturbances. (
  • Atrial fibrillation (AF) is the most commonly sustained cardiac arrhythmia, and confers a substantially increased risk of morbidity and mortality. (
  • Atrial fibrillation (AF) is the most common type of sustained cardiac arrhythmia, accounting for approximately 1/3 of hospitalizations for heart rhythm disorders ( 1 ). (
  • Atrial fibrillation (AF) is the most common arrhythmia seen in clinical practice. (
  • Influence of heart rate and atrial transport on left ventricular volume and function: relation to hemodynamic changes produced by supraventricular arrhythmia. (
  • Atrial fibrillation is a complex arrhythmia and its precise mechanisms remain unclear. (
  • Atrial fibrillation is a common arrhythmia that is associated with substantial morbidity and mortality, particularly due to stroke and thromboembolism. (
  • Atrial Fibrillation (AF) is the most common type of arrhythmia. (
  • Atrial fibrillation is the most common type of heart arrhythmia, which means the heart beats too slowly, too fast, or in an irregular pattern. (
  • Left atrial (LA) function helps to preserve cardiac output and to control pulmonary capillary wedge pressure in the setting of left ventricular (LV) impairment, but little is known about the contribution of the LA function to ventricular arrhythmia. (
  • The perioperative complications , thromboembolic events, recurrence of atrial arrhythmia and cardiac function were compared between the groups. (
  • Then, to calculate end-systolic and end-diastolic atrial and ventricular volumes, a modified Simpson's rule formula was used. (
  • End-systolic left atrial volume (mean +/- standard deviation) was 37 +/- 11.7 ml or 21 +/- 6.6 ml/m2. (
  • 1 This tachycardia induced cardiomyopathy is characterised by decreased systolic function, ventricular dilation, and raised ventricular filling pressures. (
  • In such patients left ventricular systolic function may gradually improve after electrical cardioversion. (
  • All 3 patient groups had increased LA volumes and depressed LA EF, a′, and LA A strain, with no significant difference between patients with DHF and diastolic dysfunction in LA systolic function indices, LV mass, LA volumes, LV, and arterial elastance. (
  • Further, we found improved systolic function in the active group compared with controls: left ventricular ejection fraction 61 vs. 59% (P = 0.036), tricuspid annular plane systolic excursion 12 vs. 10 mm/m(2) (P = 0.008), and RV early peak systolic velocity s 11 vs. 10 cm/s (P = 0.031). (
  • For example, although reservoir function is governed by atrial compliance during ventricular systole (and, to a lesser extent, by atrial contractility and relaxation), it is influenced by descent of the LV base during systole and by LV end-systolic volume (1) . (
  • Finally, atrial booster pump function reflects the magnitude and timing of atrial contractility but is dependent on the degree of venous return (atrial pre-load), LV end-diastolic pressures (atrial afterload), and LV systolic reserve. (
  • We measured 2D longitudinal systolic ventricular and atrial S-SR in apical 4 and 2-chambers views, at level of LV segments (4 basal,4 mid,4 apical), RV segments (1 basal,1 mid,1apical) and atrial walls and circonferential and radial peak systolic LV 2D S-SR in short axis views. (
  • The electromechanical delay parameters were measured from the onset of the P wave on the surface electrocardiogram to the onset of the atrial systolic wave on tissue Doppler imaging from septum, lateral, and right ventricular annuli. (
  • Methods: We studied pregnant women in early third trimester (III-E = gestational age 26-33 weeks), in late third trimester (III-L = gestational age 34-40 weeks), and control nonpregnant women (C). Two-dimensional (2D-Echo) and RT3DE were used to study 3D left atrial (LA) systolic and diastolic stroke volumes and index (LASVI, LAEDVI), emptying fraction, left ventricular and LA cavities. (
  • The global peak atrial longitudinal strain and strain rate of systolic LV (GLSs, GLSRs) as well as early and late diastolic LV strain rate (GLSRe, GLSRa) curves of LA were acquired in each LA segment from basal segment to top segment of LA by 2D-STE. (
  • IMSEAR at SEARO: Role of Mitral Annular Systolic Velocity in The Evaluation of Left Atrial Appendage Function in Mitral Stenosis. (
  • Majumder A A S, Tanveer M S, Reza A Q M, Chowdhury A W, Shahabuddin M. Role of Mitral Annular Systolic Velocity in The Evaluation of Left Atrial Appendage Function in Mitral Stenosis. (
  • 16 Peak atrial strain (the peak of the positive deflection occurring during the reservoir phase, when the right ventricle contracts and the right atrium fills against a closed tricuspid valve) is perhaps the most used parameter of RA function. (
  • RA volume 18 - for the same amount of blood received, dilated atria have lower peak atrial strain than non-dilated atria ( Figure 3 ). (
  • In accordance with the above, since a chronic significant left-to-right shunt through an ASD leads to a varying degree of RA dilatation due to volume overload, peak atrial strain should be decreased in ASD patients, who have dilated atria. (
  • Atrial kick (AK) accounts for 10-15% of the ejection fraction. (
  • In 10 patients count-derived left ventricular ejection fraction, end-diastolic volume and stroke volume were measured during sinus rhythm and during atrial pacing at 120, 140 and 160 beats/min. (
  • Left ventricular ejection fraction did not change significantly with atrial pacing (from 0.65 +/- 0.02 [mean +/- standard error of the mean] at a baseline sinus rate of 91 +/- 3 beats/min to 0.62 +/- 0.03 at 160 beats/min) despite a progressive decrease in end-diastolic volume. (
  • The data indicate that the hemodynamic consequences of supraventricular tachyarrhythmias in patients with normal ventricular function are due primarily to decreases in ventricular volume as heart rate is increased and atrial contribution is lost rather than to any changes in left ventricular ejection fraction. (
  • While 'ejection fraction' is the phrase used for reduction of ventricular cavity volume, 'emptying function' is more appropriate for reductions of atrial volume as the atria lack inflow valves and empty passively as well as actively. (
  • We correlated post AFCA scar with cardiac volumes and function including LA volume, LV ejection fraction (LVEF), and LV cardiac output (LVCO). (
  • Left atrial dysfunction relates to symptom onset in patients with heart failure and preserved left ventricular ejection fraction. (
  • Strain (SI) and strain rate (SR) measure regional myocardial deformation and may be a new technique to assess phasic atrial function. (
  • No significant difference was present in S-Sr, A-Sr or global atrial strain between the normal and HT cohorts. (
  • Left atrial (LA) function by volume and strain analysis in children has been little studied. (
  • Significantly higher phasic indexed LAVs and indexed active LA stroke volume (pump function) and lower strain values for LA reservoir and conduit function were noted in AS cases (Fig 2). (
  • Children with significant AS have abnormal LA function with higher phasic LA volumes, higher LA pump function, and lower strain-derived reservoir and conduit LA function. (
  • Sameh Refaat Hassa Allam ,Abdel Aziz Rezk Hassan Sheredah ,Mohammad Al Deftar ,Ahmad Kamal Mohammad Hashem , Strain/strain rate imaging of impaired left atrial function in patients with metabolic syndrome, Egypt. (
  • LA function was analysed using strain derived from speckle tracking in sinus rhythm patients (n = 83). (
  • We acquired 2D echocardiographic cineloops from the left apical 4-chamber view optimized for the LA, and analyzed atrial longitudinal strain (St) and strain rate (SR) in 27 dogs (10 healthy dogs and 17 dogs with MMVD - 5 ACVIM Stage B1, 5 Stage B2 and 7 Stage C). (
  • We aimed to use strain / strain rate (SR) imaging to investigate the effect of MS on LA function. (
  • These findings reveal a ventricular myocardial cell-autonomous function for Hrt2 in the suppression of atrial cell identity and the maintenance of postnatal cardiac function. (
  • Left atrial volume: a powerful predictor of survival after acute myocardial infarction," Circulation , vol. 107, no. 17, pp. 2207-2212, 2003. (
  • A consecutive group of patients with chronic hypertension but without significant valvular disease or prior MI underwent clinically-indicated CMR for assessment of left ventricular (LV) function, myocardial ischemia, or viability. (
  • Patients were referred either for a) evaluation for myocardial ischemia with stress CMR or b) assessment of regional and global left ventricular function and myocardial mass. (
  • OBJECTIVES: To assess the comparative effectiveness of left atrial (LA) functional parameters (left atrial emptying fraction (LAEF), left atrial expansion index (LAi) and minimal left atrial volume index (MinLAVI)) with that of LA volume index (LAVI) in predicting heart failure (HF) and death following ST-elevated myocardial infarction (STEMI). (
  • A rapid and potent natriuretic response to intravenous injection of atrial myocardial extract in rats. (
  • Echocardiographic LA volumes (LAVs), mitral valve early (MV-E) and late (MV-A) peak flow velocities, and mitral atrioventricular plane tissue-Doppler early (TD-e ') and late (TD-a ') peak velocities were obtained in 320 patients with acute myocardial infarction (AMI) free from atrial fibrillation and more than moderate valvular disease. (
  • The aim of this prospective longitudinal study was to identify physiologic effects of reinnervation on changes in heart rate at rest and in response to various stimulations and on atrial function after the Cox maze III procedure. (
  • Additionally, AF can also result in other complications, such as adverse hemodynamics, impaired cognitive function or dementia, congestive heart failure and tachycardia-induced cardiomyopathy ( 6 ). (
  • Subjects were excluded if they did not speak English or if any of the following was present: associated congenital heart defects that required cardiac surgery (except for partial anomalous pulmonary venous return associated with a sinus venosus ASD or a very small patent ductus arteriosus), congestive heart failure or pulmonary hypertension, anomalies that affect cognitive function, or chronic disease likely affecting development, such as bronchopulmonary dysplasia. (
  • Heart function improved by up to 25 percent in a trial using gene therapy to reverse cardiac damage from congestive heart failure in a large animal model, Mount Sinai researchers report. (
  • Our data suggest that STE might be useful in assessing LA function in dogs with MMVD, and might potentially differentiate dogs with severe subclinical disease from dogs with congestive heart failure. (
  • Background: Half of the patients with end-stage heart failure suffer from persistent atrial fibrillation (AF). (
  • Electrophysiological characteristics of the human atria after cardioversion of persistent atrial fibrillation. (
  • Left atrial mechanical functions were evaluated before and after PMV, including left atrial passive emptying volume, LA passive emptying fraction, conduit volume, left ventricular stroke volume, LA active emptying volume, LA active emptying fraction, LA total emptying volume and LA total emptying fraction. (
  • The early increase in conduit volume and the decrease in left atrial presystolic volume indicate that PMV has favorable effects on atrial reservoir and conduit functions. (
  • Data are sufficient to recommend evaluation of left atrial volume in certain populations, and although analysis of atrial reservoir, conduit, and booster pump function trails in that regard, the gap is rapidly closing. (
  • The principal role of the left atrium is to modulate left ventricular (LV) filling and cardiovascular performance by functioning as a reservoir for pulmonary venous return during ventricular systole, a conduit for pulmonary venous return during early ventricular diastole, and a booster pump that augments ventricular filling during late ventricular diastole. (
  • Conduit function is influenced by atrial compliance and is reciprocally related to reservoir function but by necessity is closely related to LV relaxation and compliance. (
  • The left atrium (LA) functions as a reservoir during systole, a conduit during early diastole and an active contractile chamber in late diastole [ 5 , 6 ]. (
  • conduit function i.e. (
  • Successful BMV leads to early improvement in left atrial reservoir and conduit functions, without significantly affecting left atrial pump function. (
  • SR during ventricular systole (LA-SRs) represents LA reservoir function, and SR during early ventricular diastole (LA-SRe) represents LA conduit function. (
  • P=0.039), indicating impaired LA conduit function. (
  • Kidney function was assessed by estimated glomerular filtration rate (eGFR) calculated using the Modification of Diet in Renal Disease equation, and the presence of proteinuria was measured by a urine dipstick. (
  • An important cytoprotective enzyme that has been shown to improve renal function is heme-oxygenase (HO). (
  • Atrial receptors and renal function. (
  • Adherence to the Mediterranean diet is associated with positive renal function in healthy adults. (
  • To evaluate the frequency and severity of renal function impairment and the potential impact of using the most common estimates of renal function on the dosing of direct oral anticoagulants (DOACs) among patients with atrial fibrillation (AF) and acute coronary syndrome or a planned percutaneous coronary intervention. (
  • 117.3) μmol/L. The discrepancy between renal function categories assessed using GFR MDRD and GFR CKD-EPI when compared with CrCl was observed in 23.4% and 27.6% of the cases, respectively. (
  • Renal dysfunction is an independent risk factor for stroke, especially in the setting of atrial fibrillation (AF), and adding it as a scoring element to current risk stratification models, such as CHADS2 , seems to improve stroke risk prediction. (
  • The purpose of the present study was to determine whether endogenous atrial natriuretic factor participates in the maintenance of normal vascular pressure and renal function in ovine fetuses at 128 to 130 days' gestation. (
  • Fetuses in the low-dose and control groups showed no significant change in cardiovascular or renal function. (
  • Cheung, CY 1991, ' Role of endogenous atrial natriuretic factor in the regulation of fetal cardiovascular and renal function ', American journal of obstetrics and gynecology , vol. 165, no. 4, pp. 1558-1567. (
  • A total of 2,753 patients with atrial fibrillation who were anticoagulated using Warfarin and managed by Intermountain Healthcare Clinical Pharmacist Anticoagulation Services - who had a baseline creatinine level of less than 2.0 mg/dL or a glomerular filtration rate greater than 30 and serial renal function studies - were included in the study. (
  • New data from a cohort of 13,535 patients (33,165 patient-years of data) indicate that a reduced creatinine clearance and/or proteinuria are associated with an increased risk of stroke in patients with non-valvular atrial fibrillation who were not receiving anticoagulation. (
  • Twenty seven patients with non-valvular atrial fibrillation (NVAF) and no history of stroke, transient ischaemic attack, dementia, and thyrotoxicosis were compared with 54 age and sex matched controls in sinus rhythm. (
  • Factors such as advanced age, hypertension, coronary heart disease, prior stroke, and diabetes are recognized risk factors for stroke in patients with atrial fibrillation. (
  • Despite the efficacy of antithrombotic treatment in preventing stroke in patients with atrial fibrillation, 1 community surveys report a low uptake of such treatment. (
  • Parameters of LA reservoir function i.e. (
  • PPaV 1 and PTFV 1 were associated with an increase in LA volumes and decrease in LA emptying fraction and LA reservoir function. (
  • In conclusion, a reduced atrial function was associated with smaller LA reservoir volume, larger LA transit volume, lower TD-a ', a non-linear decrease in MV-A and a non-linear increase in E/A. Our findings are likely a reflection of the adaptation to sustain LV filling volume and counteracting a rise in pulmonary venous pressure in face of an enhanced LV end-diastolic pressure. (
  • 1 Little is known about left ventricular diastolic function in AF. (
  • Increasing gestational age results in less ALDAF, and reduced ALDAF contribution to cardiac output likely due to improved diastolic function. (
  • Background: Alteration of diastolic function is considered a sensitive means for detecting changes in the normal cardiac adaptation to pregnancy. (
  • however, the effect on diastolic function and left atrial (LA) remodeling is unclear. (
  • The left atrial diameter and volume indices and left atrium / aorta ratio correlated positively with the transmitral flow peak velocity E wave and E wave /IVRT ratio, which are important indices of diastolic function. (
  • Although the MAZE procedure allows for the recovery of sinus rhythm and left atrial (LA) mechanical function in the great majority of patients with chronic atrial fibrillation (AF), the effects of MAZE on the precise LA geometry and wall motion remain to be elucidated. (
  • Levels of natriuretic peptides tended to decrease in patients with stable sinus rhythm at one year compared to patients in atrial fibrillation. (
  • Left atrial function after the Cox maze procedure improved parallel to the recovery of sinus node function. (
  • Conclusion: Progressive improvement of sinus node function and atrial contractions with significant functional normalization 1 year after the Cox maze procedure corresponded to functional reinnervation and recovery of the autonomic nervous system. (
  • These findings support the relationship of LA dysfunction with HFPEF, suggesting that the analysis of LA function may be useful in sinus rhythm patients with new-onset dyspnoea. (
  • Thromboembolism is one of the most important complications of MS, especially when it is associated with atrial fibrillation (AF).Patients with sinus rhythm (SR) are also sussceptible to this complication when it is associated with left atrial appendage (LAA) dysfunction .LAA dysfunction is an independent predictor of thromboembolism in mitral stenosis. (
  • In adult patients with Eisenmenger syndrome, we aimed to evaluate the midterm effect of bosentan on physical exercise, ventricular and atrial function, and pulmonary hemodynamics. (
  • In adult patients with Eisenmenger syndrome, bosentan therapy improves ventricular and atrial functions resulting in enhancement of physical exercise and reduction in the NT-proBNP level, while the pulmonary vascular resistance does not change substantially. (
  • Chronic pulmonary disorders, such as chronic obstructive pulmonary disease (COPD) and fibrosing lung diseases, and atrial fibrillation (AF), are prevalent in elderly people. (
  • The impact of cardiac co-morbidities in the elderly, where pulmonary function is impaired, cannot be ignored as they influence mortality. (
  • The relationship between the prevalence of AF and pulmonary function is unclear. (
  • Impaired pulmonary function is an independent risk factor for AF in the Japanese general population. (
  • These LA functions mechanically facilitate the transition between flow through the pulmonary venous circulation and the intermittent filling of the left ventricle [ 6 , 7 ]. (
  • Atrial natriuretic peptide concentrations in plasma of children with congenital heart and pulmonary diseases. (
  • BACKGROUND: Patients with mitral stenosis (MS) and heart failure (HF) are characterized by changes in the left atrial (LA) function and activation of the apoptotic process. (
  • Although the clinical impact of left atrial appendage (LAA) leaks still requires confirmation, the open pouch with residual flow resulting from incomplete LAA closure may promote blood sta. (
  • It has been suggested that successful percutaneous balloon mitral valvuloplasty (PMV) decreases the intensity of spontaneous left atrial contrast, reduces the size of the left atrium, and improves left atrial function in patient with mitral stenosis. (
  • Rheumatic mitral stenosis (MS) is associated with progressive impairment of left atrial (LA) mechanical functions. (
  • Left atrial function, cytokines and soluble apoptotic markers in mitral stenosis: effects of valvular replacement. (
  • Progressive left ventricular (LV) diastolic dysfunction due to hypertension (HTN) alters left atrial (LA) contractile function in a predictable manner. (
  • While increased LA size is a marker of LV diastolic dysfunction and has been shown to be predictive of adverse cardiovascular outcomes, the prognostic significance of altered LA contractile function is unknown. (
  • In hypertensive patients at risk for left ventricular diastolic dysfunction, a decreased contribution of LA contractile function to ventricular filling during diastole is strongly predictive of adverse cardiac events and death. (
  • While evidence exists that LA enlargement is a strong predictor of adverse cardiovascular outcomes in selected populations, there is little data regarding the prognostic implication of altered left atrial contractile function in patients with chronic hypertension at risk of diastolic dysfunction. (
  • Second, all patients were at risk of developing kidney dysfunction, including those who started with healthy kidney function and those who started with moderate-severe kidney disease. (
  • Heart and kidney dysfunction are often correlated with each other, meaning if the function of either organ begins to decline, the other may be adversely affected, causing further organ damage. (
  • Metabolic syndrome (MS) predisposes to left ventricular dysfunction and heart failure , however, alterations in left atrial (LA) function in MS are unknown. (
  • Background and Purpose-Edoxaban is a direct oral factor Xa inhibitor with proven efficacy and safety among patients with atrial fibrillation. (
  • B. Hoit, "Assessment of echocardiographic left atrial size: how accurate do we need to be? (
  • We tested the hypothesis that LA function index (LAFI), an echocardiographic index of LA structure and function, may better characterize adverse LA remodeling and predict incident AF and CVD than existing measures. (
  • Left atrial function during pregnancy: a three-dimensional echocardiographic study. (
  • However, whether echocardiographic parameters of LA function, such as LAEF, LAi and MinLAVI, are superior to LAVI for predicting prognosis following STEMI is unknown. (
  • All subjects underwent conventional echocardiographic examination and assessment of LA function by speckle tracking. (
  • The other left atrial volumes were not altered after PMV. (
  • In the 1995 participants (mean age 64.5 years) from the population-based Rotterdam Study, we measured thyroid function (thyroid-stimulating hormone, free thyroxine [FT4]) and performed computed tomography to quantify EAT volumes. (
  • We report no mediating role of EAT in the association of thyroid function with AF, but found evidence for a suggested interaction of FT4 with EAT volumes on AF risk. (
  • During simultaneous V/A pacing at 160 beats/min, the reduction in end-diastolic and stroke volumes from the baseline value was -26.6 +/- 3.8 percent and -28.8 +/- 4.3 percent, respectively (both p less than 0.01), but was significantly smaller (-16.1 +/- 3.6 percent and -19.2 +/- 4.1 percent, respectively [p less than 0.05]) when atrial transport was maintained during sequential A-V pacing at the same heart rate. (
  • During simultaneous V/A pacing at 160 beats/min, two thirds of the reduction in end-diastolic and stroke volumes from the baseline value was due to the increment in heart rate as assessed from sequential A-V pacing and the other third was due to loss of atrial transport. (
  • The left atrial volumes were calculated by the disk method. (
  • Calculation of LA volumes used in determining LA emptying functions was performed using the biplane area-length method. (
  • Echocardiographically, LA volumes were measured at mitral valve opening (Vmax), at the onset of left atrial systole (P wave of the electrocardiogram, Vp) and at the mitral valve closure (Vmin). (
  • CONCLUSION: The risk of AF, including asymptomatic AF, increases significantly with increasing LA volumes and worsening LA function. (
  • Recent findings suggest that left atrial (LA) function is more strongly related to adverse prognosis than LA volumes. (
  • We aimed to evaluate the associations between LA volumes and Doppler filling indices with LA function. (
  • This study aimed to identify novel GATA5 mutations that underlie familial atrial fibrillation. (
  • A total of 110 unrelated patients with familial atrial fibrillation and 200 unrelated, ethnically matched healthy controls were recruited. (
  • Accumulating evidence reveals that genetic variants play pivotal roles in familial atrial fibrillation (AF). (
  • The heart and the atrial natriuretic factor. (
  • Dietz , J. R. Release of natriuretic factor from rat heart-lung preparation by atrial distension. (
  • Atrial natriuretic factor-a circulating hormone stimulated by volume loading. (
  • Radioimmunoassay of atrial natriuretic factor: human plasma levels. (
  • Circulating atrial natriuretic factor in the fetus was immunoneutralized by an intravenous bolus injection of an atrial natriuretic factor antiserum at a dilution of 1:2000 (low dose, n = 7) or 1:400 (high dose, n = 6). (
  • In the high-dose group, plasma atrial natriuretic factor concentration was significantly reduced by 65 ± 14 pg/ml from basal levels of 165 ± 12 pg/ml within 10 minutes and remained reduced for the 90-minute period after the injection. (
  • Urine flow rate was suppressed for as long as plasma atrial natriuretic factor concentrations were reduced. (
  • In response to atrial natriuretic factor antiserum injection, plasma angiotensin II concentrations were increased, whereas plasma arginine vasopressin concentrations were unchanged. (
  • These results suggest that endogenous atrial natriuretic factor is involved in the maintenance of arterial pressure and urinary excretion in the ovine fetus. (
  • Background- Changes in neurocognitive function after cardiopulmonary bypass (CPB) are difficult to assess in children with congenital cardiovascular malformations in part because identification of a suitable control group of children is difficult. (
  • Left atrial volume predicts cardiovascular events in patients originally diagnosed with lone atrial fibrillation: three-decade follow-up," European Heart Journal , vol. 26, no. 23, pp. 2556-2561, 2005. (
  • Prediction of cardiovascular outcomes with left atrial size: is volume superior to area or diameter? (
  • Clinical utility and prognostic value of left atrial volume assessment by cardiovascular magnetic resonance in non-ischaemic dilated cardiomyopathy," European Journal of Heart Failure , vol. 15, no. 6, pp. 660-670, 2013. (
  • The author examines the ability of left atrial size and function to predict cardiovascular outcomes. (
  • In this state-of-the-art paper, the author reviews the methods used to assess left atrial size and function and discusses their role in predicting cardiovascular events in general and referral populations and in patients with atrial fibrillation, cardiomyopathy, ischemic heart disease, and valvular heart disease. (
  • The resurgence of interest in atrial size and function has enhanced our understanding of the atrial contributions to cardiovascular performance in health and disease. (
  • Among these measurements, maximal left atrial volume (LAV) indexed to body surface area (LAVi) is most strongly associated with cardiovascular disease and is the most sensitive in predicting cardiovascular outcomes and providing uniform and accurate risk stratification (3) . (
  • In 1909, Welch (4) noted that cardiovascular stroke associated with AF was due to left atrial appendage (LAA) thrombi and that this was the most common site for thrombus formation in the setting of AF (5) . (
  • Association of Left Atrial Function Index with Atrial Fibrillation and Cardiovascular Disease: The Framingham Offspring Study. (
  • Left atrial (LA) size, a marker of atrial structural remodeling, is associated with increased risk for atrial fibrillation (AF) and cardiovascular disease (CVD). (
  • It is well known that, as for most cardiovascular disorders, diabetes is an independent risk factor for atrial fibrillation (AF), and that the risk of AF is 1.4 to 2.1 times greater in patients with diabetes than the normal population [ 1 ]. (
  • In humans , left atrial enlargement and reduced contractile functions are associated with adverse cardiovascular events and a poor prognosis in many dilatation of the left atrium occurs with the gradual evolution of chronic mitral valve disease and is well diseases . (
  • AIMS: We aimed to investigate whether left atrial (LA) markers from cardiovascular magnetic resonance (CMR) were able to predict atrial fibrillation (AF) in elderly patients with risk factors for stroke. (
  • Early effects of percutaneous mitral valvuloplasty on left atrial mechanical functions. (
  • However, left atrial mechanical functions immediately after PMV have not been extensively evaluated yet. (
  • The aim of this study was to evaluate the effects of PMV on left atrial mechanical functions. (
  • We hypothesized that LA size and mechanical function in patients with chronic AF and mitral valvular disease are well restored after MAZE. (
  • However, chronic AF associated with mitral valve disease deteriorates LA mechanical function diffusely throughout the LA wall. (
  • The aim of this study was to investigate atrial conduction times and left atrial mechanical functions, the noninvasive predictors of atrial fibrillation, in prediabetic patients with impaired fasting glucose (IFG) and impaired glucose tolerance (IGT). (
  • Left atrial mechanical functions were calculated. (
  • In addition, the left atrial mechanical functions were impaired secondary to a deterioration in the diastolic functions in the prediabetic patients. (
  • This study investigated LA conduction times and LA mechanical functions that are predictors of AF and discussed possible mechanisms of AF development in patients with IFG and IGT at a prediabetic stage. (
  • 023). Conclusion: LAA exclusion seems to improve mechanical function of the LA and results in reverse LA remodeling. (
  • Objective: The aim of this study was to determine the role of left-sided mechanical parameters in postoperative atrial fibrillation (POAF) in patients undergoing coronary artery bypass grafting (CABG). (
  • Significant improvement in left atrial function occurs in 7 days. (
  • The aim of the study LA-EU-01 was to examine the safety and the feasibility of the LAmbreTM Left Atrial Appendage Closure System in patients with non-valvular paroxymal, persistent or perm. (
  • Comparison of Amplatzer Amulet and Watchman Device in Patients Undergoing Left Atrial Appendage Closure. (
  • Left atrial appendage closure (LAAC) is an emerging therapeutic option in non-valvular atrial fibrillation (NVAF) patients with high thromboembolic and bleeding risks. (
  • This study will evaluate thrombogenicity in patients undergoing left atrial appendage closure using the WATCHMAN device. (
  • Intracardiac echography for left atrial appendage closure : A step-by-step tutorial. (
  • Numerous studies have clearly demonstrated the prognostic value of left atrial volume for long-term outcome. (
  • Does Obesity Increase the Risk of Atrial Fibrillation? (
  • This association could underlie the increased risk of atrial fibrillation and stroke seen with the use of beta-blockers (as opposed to other antihypertensive agents) demonstrated in recent trials. (
  • Patients who use Warfarin as part of their anticoagulation treatment for atrial fibrillation should have their anticoagulation levels closely monitored to ensure proper levels," said Dr. Bunch. (
  • Effect of bosentan therapy on ventricular and atrial function in adults with Eisenmenger syndrome. (
  • LA C.O.: Left Atrial Cardiac Output. (
  • AF may also worsen heart failure in individuals who are dependent on the atrial component of the cardiac output. (
  • This review article discusses the role of cardiac magnetic resonance and computed tomography in assessment of left atrial size, its normal and abnormal morphology, and function. (
  • In this elegant study, the authors performed a comprehensive assessment of LV function, showing that extensive LV remodeling at baseline is associated with poor improvement after CRT. (
  • METHODS AND RESULTS: A total of 369 patients with STEMI but without atrial fibrillation or HF who were treated with primary percutaneous coronary intervention were prospectively enrolled in the period between September 2006 and December 2008. (
  • Percutaneous left atrial appendage (LAA) closure (placement of an occluder to close the appendage) is a novel procedure for stroke prevention in patients suffering from atrial fibrillation. (
  • We sought to provide a practical educational tool for the utilization of intracardiac echography (ICE) in the left atrium for the percutaneous closure of the left atrial appendage (LAA). (
  • CONCLUSION: The present findings indicate that mitral valve replacement in patients with mitral valve stenosis, reduces the size of the left atrium, improves left atrial contractile function and depresses inflammatory and apoptotic process. (