A type of cardiac arrhythmia with premature atrial contractions or beats caused by signals originating from ectopic atrial sites. The ectopic signals may or may not conduct to the HEART VENTRICLES. Atrial premature complexes are characterized by premature P waves on ECG which are different in configuration from the P waves generated by the normal pacemaker complex in the SINOATRIAL NODE.
A type of cardiac arrhythmia with premature contractions of the HEART VENTRICLES. It is characterized by the premature QRS complex on ECG that is of abnormal shape and great duration (generally >129 msec). It is the most common form of all cardiac arrhythmias. Premature ventricular complexes have no clinical significance except in concurrence with heart diseases.
An antiarrhythmia agent used primarily for ventricular rhythm disturbances.
Method in which prolonged electrocardiographic recordings are made on a portable tape recorder (Holter-type system) or solid-state device ("real-time" system), while the patient undergoes normal daily activities. It is useful in the diagnosis and management of intermittent cardiac arrhythmias and transient myocardial ischemia.
Any disturbances of the normal rhythmic beating of the heart or MYOCARDIAL CONTRACTION. Cardiac arrhythmias can be classified by the abnormalities in HEART RATE, disorders of electrical impulse generation, or impulse conduction.

Exercise-induced uncommon atrioventricular nodal reentrant tachycardia with sick sinus syndrome: a case report. (1/58)

Exercise seldom provokes tachycardia in patients with paroxysmal supraventricular tachycardia (PSVT). This report presents a case of exercise-induced uncommon atrioventricular nodal reentrant tachycardia (AVNRT) with sick sinus syndrome. Treadmill exercise testing provoked AVNRT of long RP' with good reproducibility. Uncommon AVNRT was confirmed by the lack of atrial pre-excitation during PSVT and para-Hisian pacing. The patient has been successfully treated with verapamil and DDD pacing for 5 years.  (+info)

Initiation of atrial fibrillation by ectopic beats originating from the pulmonary veins: electrophysiological characteristics, pharmacological responses, and effects of radiofrequency ablation. (2/58)

BACKGROUND: Atrial fibrillation (AF) can be initiated by ectopic beats originating from the atrial or great venous tissues. This study investigated the anatomic characteristics and electrophysiological properties of pulmonary veins (PVs), as well as the possible mechanisms and response to drugs of ectopic foci, and assessed the effects of radiofrequency (RF) ablation on AF initiated by ectopic beats originating from PVs. METHODS AND RESULTS: Seventy-nine patients with frequent episodes of paroxysmal AF and 10 control patients were included. Distal PVs showed the shortest effective refractory periods (ERPs), and right superior PVs showed a higher incidence of intra-PV conduction block than left superior PVs. Superior and left PVs had longer myocardial sleeves than inferior and right PVs, respectively. These electrophysiological characteristics were similar between AF and control patients. Propranolol, verapamil, and procainamide suppressed ectopic beats that originated from the PVs. Of 116 ectopic foci that initiated AF, 103 (88.8%) originated from PVs. A mean of 7+/-3 RF applications completely eliminated 110 ectopic foci (94.8%). During the 6+/-2-month follow-up period, 68 patients (86. 1%) were free of AF without any antiarrhythmic drugs. Follow-up transesophageal echocardiogram showed 42.4% of ablated PVs had focal stenosis. One patient had mild exertional dyspnea after ablation, but it resolved 3 months later; 1 patient had onset of mild exertional dyspnea 5 months after ablation. CONCLUSIONS: Electrophysiological characteristics of PVs are different from those in the atria. Ectopic beats from PVs can initiate AF, and beta-adrenergic receptor blocker, calcium channel blockers, and sodium channel blockers can suppress these ectopic beats. Careful mapping and elimination of these ectopic foci can cure paroxysmal AF.  (+info)

Altered complexity and correlation properties of R-R interval dynamics before the spontaneous onset of paroxysmal atrial fibrillation. (3/58)

BACKGROUND: Trigger mechanisms for the onset of paroxysmal atrial fibrillation (AF) in patients without structural heart disease are not well established. New analysis methods of heart rate (HR) variability based on nonlinear system theory may reveal features and abnormalities in R-R interval behavior that are not detectable by traditional analysis methods. The purpose of this study was to reveal possible alterations in the dynamics of R-R intervals before the spontaneous onset of paroxysmal AF. METHODS AND RESULTS: Traditional time and frequency domain HR variability indices, along with the short-term scaling exponent alpha(1) and approximate entropy (ApEn), were analyzed in 20-minute intervals before 92 episodes of spontaneous, paroxysmal AF in 22 patients without structural heart disease. Traditional HR variability measures showed no significant changes before the onset of AF. A progressive decrease occurred both in ApEn (1.09+/-0.26 120 to 100 minutes before AF; 0.88+/-0.24 20 to 0 minutes before AF; P<0.001) and in alpha(1) (1.01+/-0.28 120 to 100 minutes before AF, 0.89+/-0.28 20 to 0 minutes before AF; P<0.05) before the AF episodes. Both ApEn (0. 89+/-0.27 versus 1.02+/-0.30; P<0.05) and alpha(1) (0.91+/-0.28 versus 1.27+/-0.21; P<0.001) were also lower before the onset of AF compared with values obtained from matched healthy control subjects. CONCLUSIONS: A decrease in the complexity of R-R intervals and altered fractal properties in short-term R-R interval dynamics precede the spontaneous onset of AF in patients with no structural heart disease. Further studies are needed to determine the physiological correlates of these new, nonlinear HR variability measures.  (+info)

Cardiac arrhythmias and stroke: increased risk in men with high frequency of atrial ectopic beats. (4/58)

BACKGROUND AND PURPOSE: With the exception of atrial fibrillation (AF), little scientific attention has been given the associations between cardiac arrhythmias and incidence of stroke. We sought to study whether atrial and ventricular arrhythmias assessed during a 24-hour ambulatory ECG registration are associated with incidence of stroke. METHODS: The population-based cohort "Men Born in 1914" was examined with 24-hour ambulatory ECG registrations at 68 years of age. Four hundred two men without previous myocardial infarction or stroke were included, and 236 of them had hypertension (>/=160/95 mm Hg or treatment). Fourteen-year rates of stroke (fatal and nonfatal) and all-cause mortality were updated from national and regional registers. Frequent or complex ventricular arrhythmias was defined as Lown class 2 to 5. A high frequency of atrial ectopic beats (AEB) was defined as the fifth quintile (ie, >/=218 AEB per 24 hours). RESULTS: Fifty-eight men suffered a first stroke during the follow-up. Stroke rates (per 1000 person-years) among men with AF (n=14), with frequent AEB (n=77), and without AF or frequent AEB (n=311) were 34.5, 19.5, and 11.6, respectively. The corresponding values among men with hypertension were 40.7, 32.3, and 14.7, respectively. Frequent AEB (compared with absence of AF and frequent AEB) was significantly associated with stroke among all men (relative risk=1.9; 95% CI, 1.02 to 3.4; P:=0.04) and among hypertensive men (relative risk=2.5; 95% CI, 1.3 to 4.8; P:=0.009) after adjustments for potential confounders. The increased stroke rates among men with Lown class 2 to 5 did not reach statistical significance. CONCLUSIONS: A high frequency of AEB is associated with an increased incidence of stroke.  (+info)

Evaluation of post-repolarization refractoriness for conduction block in cardiac muscle: studies in an artificial isthmus in the canine right atrium. (5/58)

Post-repolarization refractoriness (PRR) is an important factor in determining conduction block and is the difference between the effective refractory period (ERP) and the duration of the monophasic action potential (MAPD). In the present study, conduction block in an artificial isthmus in the canine atrium was evaluated and the coupling interval of a premature beat, which caused the block, was defined as the block coupling interval (BCI). The usefulness of this value was also evaluated. Radiofrequency linear ablation was performed on the right atrial surface parallel to the atrioventricular groove in 5 mongrel dogs, and an artificial isthmus (8-10mm wide and 25-30mm long) was created. Fourteen simultaneous unipolar recordings were performed in the isthmus with a resolution of 1.2 mm. Single extra-stimuli with basic drive train were delivered to induce conduction block in the isthmus and when it occurred, the coupling interval at the recording site just proximal to the site of the block was defined as the BCI. At the site of the block, the ERP and MAPD at each drive cycle length were measured. The PRR was calculated using 2 different formulae: (1) [ERP-MAPD], and (2) [BCI-MAPD]. It was found that each value was shortened in accordance with the shortening of the basic drive cycle length. In all basic drive trains, BCI>ERP>MAPD, and [ERP-MAPD] was always shorter than [BCI-MAPD]. In the shorter cycle length of basic drives, the difference between [ERP-MAPD] and [BCI-MAPD] was more prominent. In the artificial isthmus model in the canine atrium, BCI was always longer than the ERP measured at the same site as the block. Because the ERP may not directly reflect the block phenomenon, the electrophysiologic evaluation should use the BCI instead, as in the PRR evaluation.  (+info)

The class III antiarrhythmic drugs dofetilide and sotalol prevent AF induction by atrial premature complexes at doses that fail to terminate AF. (6/58)

BACKGROUND: Clinical trials suggest that sotalol and dofetilide are much more effective in preventing atrial fibrillation (AF) than in terminating it. This study evaluated potential mechanisms of discordant sotalol and dofetilide effects on AF termination vs. prevention. METHODS: We applied 240-electrode epicardial mapping and programmed stimulation in a vagotonic dog model of AF before and after dofetilide or sotalol. RESULTS: Under control conditions, sustained AF could be induced by single S(2) extrastimuli that caused unidirectional block and macroreentry. Sotalol (2 mg/kg) and dofetilide (0.04 mg/kg) failed to terminate AF in any dog, but prevented AF induction by S(2) stimuli in 19/22 (86%) and 4/5 (80%) of animals, respectively. With sotalol and dofetilide, unidirectional block still occurred, but wavefront reentry failed. The prevention of S(2)-induced reentry was related to large increases in the effective refractory period (ERP) at a BCL of 1000 ms, leading to ERPs that exceeded the conduction delay following S(2). Reverse use-dependent effects resulted in smaller ERP increases at BCLs closer to the AF cycle length. Although the number of zones of reactivation per cycle during sustained AF were decreased by sotalol and dofetilide, the changes were small and insufficient to terminate AF. CONCLUSIONS: Sotalol and dofetilide prevent AF initiation by premature depolarizations at doses that fail to terminate vagotonic AF, by increasing ERP at the basic cycle length beyond the associated conduction delay that leads to reentry.  (+info)

Giant negative T waves during interferon therapy in a patient with chronic hepatitis C. (7/58)

Interferon-alpha (IFN-alpha) has been widely used for treatment of chronic hepatitis C in Japan. In general, cardiovascular adverse reactions are rare in association with IFN-alpha therapy. Here, a 64-year-old man with chronic active hepatitis C complained of fatigue, palpitation and depression, and developed atrial fibrillation with prominent negative T waves during IFN-alpha therapy. Echocardiogram showed septal and apical hypertrophy. Three days after discontinuation of IFN-alpha, subjective symptoms and atrial fibrillation subsided. It is unclear whether or not IFN-alpha induced the giant negative T waves with apical hypertrophy. We might observe the developing course of hepatitis C virus (HCV)-related myocardial hypertrophy by chance. Cardiovascular toxicity should be carefully monitored during IFN-alpha therapy even in patients with minor cardiac disease, such as premature ventricular contracture (PVC) and mild hypertension.  (+info)

Chronic atrial fibrillation in patients with rheumatic heart disease: mapping and radiofrequency ablation of flutter circuits seen at initiation after cardioversion. (8/58)

BACKGROUND: There is little information concerning mapping and radiofrequency ablation (RFA) of arrhythmias seen during reinduction of atrial fibrillation (AF) after pharmacological and/or electrical cardioversion in patients with chronic AF and rheumatic heart disease. METHODS AND RESULTS: Seventeen patients with rheumatic heart disease and symptomatic chronic AF underwent multisite atrial mapping during reinduction of AF after cardioversion. An organized atrial arrhythmia of varying duration was seen to precede the AF in all patients. The earliest atrial activity during this organized rhythm was near the coronary sinus ostium (CS OS) in 14 patients and along the left side of the interatrial septum (IAS) in 3 patients. RFA was performed in 16 patients (14 near the CS OS and 2 along the IAS). Postablation AF was inducible in 1 patient in whom RFA was preformed near the CS OS and in both patients when it was performed along the IAS. At a follow-up of 6 to 56 weeks (mean, 32 weeks), 10 of the 13 patients who had successful ablation were in sinus rhythm. All patients in whom AF was reinducible immediately after RFA continue to be in AF. CONCLUSIONS: Induced AF in patients with rheumatic heart disease begins as a rapid organized arrhythmia with earliest atrial activity near the CS OS in most patients. RFA targeting the region of the CS OS is successful in suppressing the arrhythmia immediately in most of the patients and in most on follow-up.  (+info)

Atrial premature complexes (APCs or APCTs) are extra heartbeats that originate in the atria, which are the upper chambers of the heart. These early beats disrupt the normal rhythm and cause a premature contraction before the next scheduled beat. APCs can sometimes be felt as a "skipped" beat or palpitation. They are usually benign and do not require treatment unless they occur frequently or are associated with underlying heart disease.

Ventricular Premature Complexes (VPCs), also known as Ventricular Extrasystoles or Premature Ventricular Contractions (PVCs), are extra heartbeats that originate in the ventricles, the lower chambers of the heart. These premature beats disrupt the normal sequence of electrical impulses in the heart and cause the ventricles to contract earlier than they should.

VPCs can result in a noticeable "skipped" or "extra" beat sensation, often followed by a stronger beat as the heart returns to its regular rhythm. They may occur occasionally in healthy individuals with no underlying heart condition, but frequent VPCs could indicate an underlying issue such as heart disease, electrolyte imbalance, or digitalis toxicity. In some cases, VPCs can be harmless and require no treatment; however, if they are frequent or associated with structural heart problems, further evaluation and management may be necessary to prevent potential complications like reduced cardiac output or heart failure.

Moricizine is an antiarrhythmic medication that belongs to the class IC. It works by stabilizing the heart's electrical activity and correcting irregular heart rhythms (arrhythmias). Moricizine is used to treat certain types of serious, life-threatening ventricular arrhythmias.

It's important to note that moricizine has been discontinued in many countries due to the availability of safer and more effective antiarrhythmic medications. The use of moricizine should be under the close supervision of a healthcare professional, and it is usually reserved for situations where other treatments have not been effective.

The medical definition of 'Moricizine' is:

A class IC antiarrhythmic drug that prolongs the refractory period of the ventricles by selectively blocking sodium channels during phase 0 of the action potential, thereby stabilizing cardiac membranes and suppressing ectopic pacemaker activity. Moricizine is used in the treatment of certain types of serious, life-threatening ventricular arrhythmias.

Ambulatory electrocardiography, also known as ambulatory ECG or Holter monitoring, is a non-invasive method of recording the electrical activity of the heart over an extended period of time (typically 24 hours or more) while the patient goes about their daily activities. The device used to record the ECG is called a Holter monitor, which consists of a small, portable recorder that is attached to the patient's chest with electrodes.

The recorded data provides information on any abnormalities in the heart's rhythm or electrical activity during different stages of activity and rest, allowing healthcare providers to diagnose and evaluate various cardiac conditions such as arrhythmias, ischemia, and infarction. The ability to monitor the heart's activity over an extended period while the patient performs their normal activities provides valuable information that may not be captured during a standard ECG, which only records the heart's electrical activity for a few seconds.

In summary, ambulatory electrocardiography is a diagnostic tool used to evaluate the electrical activity of the heart over an extended period, allowing healthcare providers to diagnose and manage various cardiac conditions.

Cardiac arrhythmias are abnormal heart rhythms that result from disturbances in the electrical conduction system of the heart. The heart's normal rhythm is controlled by an electrical signal that originates in the sinoatrial (SA) node, located in the right atrium. This signal travels through the atrioventricular (AV) node and into the ventricles, causing them to contract and pump blood throughout the body.

An arrhythmia occurs when there is a disruption in this electrical pathway or when the heart's natural pacemaker produces an abnormal rhythm. This can cause the heart to beat too fast (tachycardia), too slow (bradycardia), or irregularly.

There are several types of cardiac arrhythmias, including:

1. Atrial fibrillation: A rapid and irregular heartbeat that starts in the atria (the upper chambers of the heart).
2. Atrial flutter: A rapid but regular heartbeat that starts in the atria.
3. Supraventricular tachycardia (SVT): A rapid heartbeat that starts above the ventricles, usually in the atria or AV node.
4. Ventricular tachycardia: A rapid and potentially life-threatening heart rhythm that originates in the ventricles.
5. Ventricular fibrillation: A chaotic and disorganized electrical activity in the ventricles, which can be fatal if not treated immediately.
6. Heart block: A delay or interruption in the conduction of electrical signals from the atria to the ventricles.

Cardiac arrhythmias can cause various symptoms, such as palpitations, dizziness, shortness of breath, chest pain, and fatigue. In some cases, they may not cause any symptoms and go unnoticed. However, if left untreated, certain types of arrhythmias can lead to serious complications, including stroke, heart failure, or even sudden cardiac death.

Treatment for cardiac arrhythmias depends on the type, severity, and underlying causes. Options may include lifestyle changes, medications, cardioversion (electrical shock therapy), catheter ablation, implantable devices such as pacemakers or defibrillators, and surgery. It is essential to consult a healthcare professional for proper evaluation and management of cardiac arrhythmias.

... (PAC), also known as atrial premature complexes (APC) or atrial premature beats (APB), are a ... This can be either a premature atrial contraction or a premature impulse from the atrioventricular node. SVES should be viewed ... Often, hypertension goes hand in hand with various atrial fibrillations including premature atrial contractions (PACs). ... narrow QRS complex. However, if the atrial beat is premature enough, it may reach the atrioventricular node during its ...
... premature MeSH C23.550.073.325.050 - atrial premature complexes MeSH C23.550.073.325.800 - ventricular premature complexes MeSH ... atrial flutter MeSH C23.550.073.300 - bradycardia MeSH C23.550.073.325 - cardiac complexes, ... ectopic atrial MeSH C23.550.073.845.880.320 - tachycardia, ectopic junctional MeSH C23.550.073.845.880.840 - tachycardia, ...
... an endoscopic technique for controlling hemorrhage Atrial premature complexes, a type of premature heart beat or irregular ... mutations in which can cause colon cancer Anaphase-promoting complex, a ubiquitin ligase cell cycle protein Antigen-presenting ...
... premature MeSH C14.280.067.325.250 - atrial premature complexes MeSH C14.280.067.325.500 - ventricular premature complexes MeSH ... atrial flutter MeSH C14.280.067.319 - bradycardia MeSH C14.280.067.325 - cardiac complexes, ... atrial MeSH C14.240.400.560.375.518 - Lutembacher's syndrome MeSH C14.240.400.560.375.702 - trilogy of Fallot MeSH C14.240. ... atrial MeSH C14.280.400.560.375.518 - Lutembacher's syndrome MeSH C14.280.400.560.375.702 - trilogy of Fallot MeSH C14.280. ...
"ST-segment abnormalities and premature complexes are predictors of new-onset atrial fibrillation: the Niigata preventive ... PVCs can be distinguished from premature atrial contractions because the compensatory pause is longer following premature ... In those with symptoms suggestive of premature ventricular complexes, the ECG/EKG is the first investigation that may identify ... Ataklte, F; Erqou, S; Laukkanen, J; Kaptoge, S (15 October 2013). "Meta-analysis of ventricular premature complexes and their ...
Doberman Pinschers more commonly have ventricular arrhythmias (e.g., premature ventricular complexes; ventricular tachycardia) ... Atrial septal defect* is a hole in the division between the heart atria (upper chambers of the heart). It is an uncommon ... Glomerulonephritis* is the presence of immune complexes in the glomerulus, resulting in leakage of protein into the urine. It ... Rare causes include trauma, clotting disorders, and left atrial rupture. Serous accumulation is rare and caused by heart ...
... not preceded by any atrial complex or P wave or preceded by an abnormal P wave with a shorter PR interval. Rarely, the abnormal ... Premature atrial contraction Premature ventricular contraction Tipton MJ, Kelleher PC, Golden FS Institute of Naval Medicine, ... On the surface ECG, premature junctional contractions will appear as a normally shaped ventricular complex or QRS complex, ... Premature junctional contractions (PJCs), also called atrioventricular junctional premature complexes or junctional ...
It is more often misinterpreted as a premature ventricular complex. It is named for Richard Ashman (of New Orleans) (1890 -1969 ... Harrigan, RA; Garg, M (Dec 2013). "An interesting cause of wide complex tachycardia: Ashman's phenomenon in atrial fibrillation ... Ashman beats are described as wide complex QRS complexes that follow a short R-R interval preceded by a long R-R interval. This ... Oreto, G; Luzza, F; Satullo, G; Donato, A; Carbone, V; Calabrò, MP (Sep 2009). "[Wide QRS complex tachycardia: an old and new ...
... the QRS complex is normal. A premature atrial pacemaker has a regular underlying rhythm however there is a premature beat which ... Atrial flutter has an atrial rate of 250-400 and can be identified by p waves with saw tooth deflections. Atrial fibrillation ... the QRS complex is premature for the PAC, but is generally normal. Paroxysmal atrial tachycardia has a regular rate, however a ... There are 5 different atrial arrhythmias. A wandering atrial pacemaker can be either normal or irregular in rate, much like a ...
Procainamide can be used to treat atrial fibrillation in the setting of Wolff-Parkinson-White syndrome, and to treat wide ... Class Ib agents are indicated for the treatment of ventricular tachycardia and symptomatic premature ventricular beats, and ... complex hemodynamically stable tachycardias. Oral procainamide is no longer being manufactured in the US, but intravenous ... While procainamide and quinidine may be used in the conversion of atrial fibrillation to normal sinus rhythm, they should only ...
It can also occur following a premature ventricular contraction or blocked premature atrial contraction. Junctional rhythms (if ... P-R interval: If the P wave occurs before the QRS complex, the interval will be less than 0.12 seconds. QRS Complex: Usually ... They will be inverted, and may appear before or after the QRS complex, or they may be absent, hidden by the QRS. ... This rhythm can usually be tolerated if the rate is above 50 beats per minute.[citation needed] A junctional escape complex is ...
Initiation of AVRT may be through a premature impulse of atrial, junctional, or ventricular origin. Acute management is as for ... would appear as a narrow-complex SVT. Between episodes of tachycardia the affected person is likely to be asymptomatic; however ... Then, the electrical impulse pathologically passes back into the atria via the accessory pathway, causing atrial contraction, ...
Premature atrial contractions (PACs or APCs) - Normal beats originate in the SA node and extra beats originating from the atria ... Troponin - The troponin complex is present in skeletal and cardiac muscle, but cardiac-specific forms of troponin I and ... Atrial fibrillation (afib or AF) - Fibrillation of the atria is fairly common and more common with increased age and overall ... Atrial flutter (AFL) - A re-entrant tachycardia greater than 240 beats per minute and produces a characteristic saw-tooth ...
During atrial ectopic activity where the P wave is normally rounded can be inverted or peaked. However the QRS complex and T ... When an ectopic pacemaker initiates a beat, premature contraction occurs. A premature contraction will not follow the normal ... An ectopic pacemaker located in the atria is known as an atrial pacemaker and can cause the atrial contraction to be faster. An ... "Disturbances in Atrial Rhythm and Conduction Following the Surgical Creation of an Atrial Septal Defect by the Blalock-Hanlon ...
Atrial fibrillation and atrial flutter without rapid ventricular response Premature atrial contraction (PACs) and premature ... QRS complexes is the hallmark of atrial fibrillation. A "saw tooth" pattern with QRS complexes is the hallmark of atrial ... Atrial repolarisation is typically hidden in the much more prominent QRS complex and normally cannot be seen without additional ... For example, an "irregularly irregular" QRS complex without P waves is the hallmark of atrial fibrillation; however, other ...
The type of arrhythmia ranges from frequent premature ventricular complexes (PVCs) to ventricular tachycardia (VT) to ... Signs and symptoms of left ventricular failure may become evident, including congestive heart failure, atrial fibrillation, and ... This is described as a terminal notch in the QRS complex. It is due to slowed intraventricular conduction. The epsilon wave may ... Congenital heart disease Repaired tetralogy of Fallot Ebstein's anomaly Uhl's anomaly Atrial septal defect Partial anomalous ...
The GB of MYO5A can form a complex with Rab3A. The involvement of this complex is important for the synaptic vesicles (SVs) ... This defect is due a mutation in which a premature stop codon in the globular tail disrupt melanosome transport producing ... New strategies targeting Kv1.5 current through MYO5A and MYO5B in human atrial fibrillation (AF) are being studied. Over ... organelles and protein complexes along the actin filaments. In humans it is coded for by the MYO5A gene. In the presence of ...
... and intra-atrial re-entrant tachycardia can occur after tetralogy repair. With broad complex tachycardia, the ECG will likely ... Maternal smoking: Maternal smoking has been associated with various fetal complications such as premature delivery and low ... Atrial septal defects (ASDs) are a kind of congenital heart abnormality in which a tiny opening exists between the two atria of ... Differences in right atrial and ventricular mechanics and liver stiffness was also observed in adults with repaired TOF, as ...
... atrial fibrillation, or atrial flutter. Cardiac electrophysiology Electrocardiogram Electrophysiology study Premature ... The QRS complex is often normal but can also be narrow in LGL syndrome, as opposed to WPW, because ventricular conduction is ... Those with LGL syndrome have episodes of abnormal heart racing with a short PR interval and normal QRS complexes seen on their ... Lown B, Ganong WF, Levine SA (May 1952). "The syndrome of short P-R interval, normal QRS complex and paroxysmal rapid heart ...
... wherein it suppresses chronic premature ventricular complexes. It has a half life of 26.5 +-7.2 hrs. Synthesis starts by ... Untreated arrhythmias may progress to atrial fibrillation or ventricular fibrillation. Treatment is aimed at normalizing ... is a Class 1c antiarrhythmic agent that is used to help restore normal heart rhythm and conduction in patients with premature ...
... abbreviated in the USA as PA-C Plasma aldosterone concentration Post-abortion care Pre-anesthesia checkup Premature atrial ... PAC 750XL PAC Cresco PAC CT/4 PAC Fletcher Pakistan Aeronautical Complex, aerospace manufacturer Polar Air Cargo airline, ...
Rubella can also lead to atrial and ventricular septal defects in the heart. If exposed to rubella in the second trimester, the ... According to the Centers for Disease Control and Prevention (CDC), most birth defects are believed to be caused by a complex ... Exposure during the first eight weeks of development can also lead to premature birth and fetal death. These numbers are ... For 20-25% of anomalies there seems to be a "multifactorial" cause, meaning a complex interaction of multiple minor genetic ...
Atrial repolarization occurs and is masked during the QRS complex by ventricular depolarization on the ECG. The last event of ... This prevents premature relaxation, maintaining initial contraction until the entire myocardium has had time to depolarize and ... The delay in the AV node forms much of the PR segment on the ECG, and part of atrial repolarization can be represented by the ... The spread of electrical activity through the ventricular myocardium produces the QRS complex on the ECG. ...
... atrial fibrillation, atrial flutter, and paroxysmal supraventricular tachycardia). An AV-junctional rhythm, or atrioventricular ... Impulses originating within or below the bundle of His in the AV node will produce a wide QRS complex with heart rates between ... For infants, bradycardia is defined as a heart rate less than 100 BPM (normal is around 120-160 BPM). Premature babies are more ... Those above the bundle of His, also known as junctional, will typically range between 40 and 60 BPM with a narrow QRS complex. ...
Premature infants with immature brains and reflex systems are at high risk for central sleep apnea syndrome, even if these ... CSA with Cheyne-Stokes breathing is characterized by at least one of the criteria of Primary CSA or the presence of atrial ... also called Complex Sleep Apnea). The following symptoms are present in the Primary CSA: excessive daytime sleepiness, frequent ... Premature babies who have the syndrome will generally outgrow it as they mature, provided that they receive careful enough ...
In 1971, he reported on the use of programmed electrical stimulation of the heart in patients with atrial flutter, AV nodal ... In these patients, cardiac arrhythmias were shown to be initiated and terminated by critically timed premature beats. Wellens ... "Josephson and Wellens: How to Approach Complex Arrhythmias Digital Experience". Medtronic Academy. Lévy, Samuel (7 August 2020 ... the arrhythmia of patients with ventricular tachycardia could also reproducibly be initiated and terminated by timed premature ...
Bertrix L, Timour-Chah Q, Lang J, Lakhal M, Faucon G (May 1986). "Protection against ventricular and atrial fibrillation by ... Without the binding of catecholamines to the β-adrenergic receptor, the G protein complex associated with the receptor cannot ... helps to correct arrhythmias by reducing the potential for premature or abnormal contraction of the ventricles but also ... Across several clinical trials, 0.6% of oral sotalol patients with supraventricular abnormal heart rhythms (such as atrial ...
The investigators observed no change in the number of premature ventricular contractions of premature atrial contractions per ... The QRS complex is usually of fixed duration in healthy individuals and does not change during long-duration space flight. Thus ... One crewmember during Apollo 15 experienced a 22-beat nodal bigeminal rhythm, which was followed by premature atrial beats. ... Other heart rhythm problems, such as atrial fibrillation, can develop over time, necessitating periodic screening of ...
Atrial or ventricular septal defects are usually treated with observation but can be surgically corrected in severe cases. Some ... Some of those affected have been reported to have premature fusion of the skull bones (craniosynostosis), particularly those ... HNRNPK codes for heterogeneous nuclear ribonucleoprotein K. Ribonucleoproteins are proteins that form complexes with RNA, and ... Individuals with Okamoto syndrome are typically born with heart defects, which can include aortic valve stenosis, atrial or ...
Recurrent syncope with complex associated symptoms. This is neurally mediated syncope (NMS). It is associated with any of the ... Rarely, cardiac tumors such as atrial myxomas can also lead to syncope. Diseases involving the shape and strength of the heart ... a heart rate of over 100 beats per minute with at least three irregular heartbeats as a sequence of consecutive premature beats ...
Premature Atrial Complex. « Back to Glossary Index. Premature P waves, usually different from the sinus p-wave in morphology. ... The QRS complex is similar to the one that follows sinus P waves ...
Atrial Premature Complexes. Medically reviewed by Debra Sullivan, Ph.D., MSN, R.N., CNE, COI ...
BACKGROUND: Premature atrial complexes from pulmonary veins are the main triggers for atrial fibrillation in the early stages. ... Predictive value of premature atrial complex characteristics in pulmonary vein isolation for patients with paroxysmal atrial ... CONCLUSION: Preprocedural premature atrial complex analysis on 24-hour Holter electrocardiogram in paroxysmal atrial ... MeSH terms: Action Potentials; Aged; Atrial Fibrillation; Atrial Premature Complexes; Catheter Ablation; Clinical Decision- ...
Premature atrial contraction (PAC), also known as atrial premature complexes (APC) or atrial premature beats (APB), are a ... This can be either a premature atrial contraction or a premature impulse from the atrioventricular node. SVES should be viewed ... Often, hypertension goes hand in hand with various atrial fibrillations including premature atrial contractions (PACs). ... narrow QRS complex. However, if the atrial beat is premature enough, it may reach the atrioventricular node during its ...
Atrial Premature Complexes / physiopathology * Ceruloplasmin / metabolism * Copper / blood * Copper / metabolism * ...
Atrial premature complex. J Am Vet Med Assoc 2008;233:561-562. ... Atrial premature complex. J Am Vet Med Assoc 2008;233:561-562. ... Atrial premature complex. J Am Vet Med Assoc 2008;233:561-562. ... Atrial premature complex. . J Am Vet Med Assoc. 2008. ;. 233. : ... Sinus arrhythmia with occasional premature atrial complexes. J Am Vet Med Assoc 1997;210:900-901. ... Sinus arrhythmia with occasional premature atrial complexes. J Am Vet Med Assoc 1997;210:900-901. ...
Premature atrial complexes in an ischemic stroke population and risk of recurrent stroke: a systematic review. Sejr, M. H., ... Atrial flutter and thromboembolic risk: a systematic review. Vadmann, H., Nielsen, P. B., Hjortshøj, S. P., Riahi, S., ... Associations between socioeconomic status, atrial fibrillation, and outcomes: a systematic review. Danielsen Lunde, E., Nielsen ...
QRS complexes without P waves Either ectopic complexes (premature or escape), atrial fibrillation or sinoventricular complexes ... No normal atrial depolarization, e.g., atrial fibrillation, atrial standstill The P waves are hidden within the QRS complexes, ... Narrow complexes therefore indicate complexes of supraventricular origin Wide complexes suggest that the ventricles have taken ... Do all the complexes look the same? If there is more than one form of QRS complex, one should attempt to identify to classify ...
Atrial fibrillation, flutter and ventricular premature complexes can also be found.. b) Becker (BMD). is less common (3 per ...
Atrial Fibrillation. *Atrial Flutter. *Atrial Premature Complexes. *Tachycardia, Ventricular. *Ventricular Premature Complexes ... Disopyramide may widen the QRS complex. If this happens, your doctor will stop disopyramide. ...
Mechanism and interpretation of two-for-one response to premature atrial complexes during atrioventricular node re-entry ... A premature atrial beat may cause a unidirectional block in the fast pathway (because of its longer ERP) but conduct via the ... Atrial flutter. Acute: ibutilide (I); verapamil and diltiazem, beta-blockers (all IIa); atrial or transesophageal pacing (IIb ... Is the Risk for Atrial Fibrillation With Cancer Drugs Higher Than We Think? 0.25 CME / CE / ABIM MOC Credits Clinical Review ...
29.11.2005 Atrial premature complexes in cattle*17.10.2005 FDA plans reduction of BSE infection risk by 90 percent*12.10.2005 ... 14.08.2010 Complex Vertebral Malformation and Luteal Function in Holstein Cows. *29.07.2010 Myelodysplasia in two calves. * ... 01.09.2018 Flecainide on induced atrial fibrillation in horses. *30.08.2018 Sonographic technique to identify manica flexoria ... 24.03.2016 Treatment of sustained monomorphic narrow-complex ventricular tachycardia in a mare. *19.03.2016 Effects of ...
KEY WORDS: Ventricular fibrillation - Atrial fibrillation - Ventricular premature complexes - Tachycardia, ectopic atrial ... but also as a guide for trans-catheter ablation of complex arrhythmias such as atrial fibrillation. It provides the clinician ...
We searched on Pubmed for ventricular premature complexes (VPC) in pregnant women and found no case reporting increased ... Premature extra beats and sustained tachyarrhythmias are the most common arrhythmias in pregnancy. Symptomatic episodes occur ... Atrial premature complexes (APC), ventricular premature complexes (VPC), and supraventricular tachyarrhythmias are more ... We searched on Pubmed for ventricular premature complexes (VPC) in pregnant women and found no case reporting increased ...
... premature ventricular complexes and paroxysmal atrial fibrillation,compared to otherwise similar subgroup of 22 patients ... study showed in the subgroup of 26 patients with OSA a more prevalent presence of ACDs including premature atrial complexes, ...
Premature atrial complexes detection using the Fisher Linear Discriminant. Elgendi, M., Jonkman, M. & De Boer, F., 2008, ... Goh, W. D. & Misra, R., 2006, Phonological Similarity Effects in Simple and Complex Word Spans. UC Merced School of Natural ... Phonological Similarity Effects in Simple and Complex Word Spans. ...
There was a higher number of premature ventricular and atrial complexes per hour in patients with arrhythmias. In conclusion, ... Predictors pre-determined for analysis included premature ventricular and atrial complex burden (%), degree of QTc change with ... Atrial Flutter and Atrial Fibrillation in Young Patients with Normal Hearts Catheter Ablation of Cardiac Arrhythmias in ... Modelling Left Atrial Flow and Blood Coagulation for Risk of Thrombus Formation in Atrial Fibrillation Qureshi, A., Darwish, O ...
Atrial Fibrillation and Atrial Flutter. Atrial Premature Complexes. Atrial Septal Defect. Atrial Standstill. Atrial Wall Tear. ...
Dive into the research topics of Sinus node response to premature atrial stimulation in the rabbit studied with multiple ... Sinus node response to premature atrial stimulation in the rabbit studied with multiple microelectrode impalements. ... Atrial Premature Complexes 87% * Rabbits 56% * Premature Cardiac Complexes 28% * Heart 12% ...
Heart rate and premature atrial contractions at 24hECG independently predict atrial fibrillation in a population-based study. ... Atrial Premature Complexes 100% * Atrial Fibrillation 61% * Heart Rate 50% * Population 26% ...
Atrial Premature Complexes 16% * Ventricular Premature Complexes 15% * Mortality 15% * Ventricular Septum 14% ...
atrial premature complexes (1) Date. Filter by date. Date range Single date ...
Atrial fibrillation is common, and ventricular or atrial premature complexes may also be evident. Echocardiography reveals ...
premature atrial complex (5) * premature ventricular complex (1) * premture jucnional complex (1) ... atrial fibrillation with complete heart block (2) * atrial fibrillation with entrance block and junctional tachycardia with ...
premature atrial complex (5) * premature ventricular complex (1) * premture jucnional complex (1) ... atrial fibrillation with complete heart block (2) * atrial fibrillation with entrance block and junctional tachycardia with ...
Premature atrial complex (PAC; also referred to a premature atrial beat, premature supraventricular complex, or premature ... 113 : Mapping the conversion of atrial flutter to atrial fibrillation and atrial fibrillation to atrial flutter. Insights into ... Mapping the conversion of atrial flutter to atrial fibrillation and atrial fibrillation to atrial flutter. Insights into ... Premature atrial complex - PAC is important as a trigger of PAF (see Pathogenesis above). The issue of whether they are ...
Atrial Premature Complexes Medicine & Life Sciences 17% * Buffaloes Medicine & Life Sciences 15% ... keywords = "Coronary disease, Electrocardiography, Heart, Premature atrial beats, Premature ventricular beats",. author = "Kohn ... The combined scores of the six variables for all premature ventricular beat fathers and premature ventricular beat fathers ... The combined scores of the six variables for all premature ventricular beat fathers and premature ventricular beat fathers ...
Atrial Premature Complexes Medicine & Life Sciences 28% * Sinus Tachycardia Medicine & Life Sciences 27% ... premature atrial/ventricular contractions, and even atrial fibrillations or flutter patterns. However, events are generally ... premature atrial/ventricular contractions, and even atrial fibrillations or flutter patterns. However, events are generally ... premature atrial/ventricular contractions, and even atrial fibrillations or flutter patterns. However, events are generally ...
  • Predictive value of premature atrial complex characteristics in pulmonary vein isolation for patients with paroxysmal atrial fibrillation. (cepia.team)
  • Premature atrial complexes from pulmonary veins are the main triggers for atrial fibrillation in the early stages. (cepia.team)
  • Thus, pulmonary vein isolation is the cornerstone of catheter ablation for paroxysmal atrial fibrillation. (cepia.team)
  • To assess whether premature atrial complex characteristics before catheter ablation can predict pulmonary vein isolation success in paroxysmal atrial fibrillation. (cepia.team)
  • We investigated consecutive patients who underwent catheter ablation for paroxysmal atrial fibrillation from January 2013 to April 2017 in two French centres. (cepia.team)
  • Preprocedural premature atrial complex analysis on 24-hour Holter electrocardiogram in paroxysmal atrial fibrillation may improve patient selection for pulmonary vein isolation. (cepia.team)
  • Rarely, in patients with other underlying structural heart problems, PACs can trigger a more serious arrhythmia such as atrial flutter or atrial fibrillation. (wikipedia.org)
  • Atrial fibrillation, flutter and ventricular premature complexes can also be found. (escardio.org)
  • ECM is emerging as an important tool not only for diagnostic mapping, but also as a guide for trans-catheter ablation of complex arrhythmias such as atrial fibrillation. (minervamedica.it)
  • Of total 48 patients, the current study showed in the subgroup of 26 patients with OSA a more prevalent presence of ACDs including premature atrial complexes, sinus bradycardia, sinus pauses, premature ventricular complexes and paroxysmal atrial fibrillation,compared to otherwise similar subgroup of 22 patients without OSA. (easychair.org)
  • Atrial Fibrillation and Atrial Flutter. (vacante-insorite.ro)
  • Atrial fibrillation is common, and ventricular or atrial premature complexes may also be evident. (msdvetmanual.com)
  • INTRODUCTION - Atrial fibrillation (AF) is the most common sustained cardiac arrhythmia in clinical practice. (medilib.ir)
  • See "Atrial fibrillation: Overview and management of new-onset atrial fibrillation" . (medilib.ir)
  • EPIDEMIOLOGY - Atrial fibrillation (AF) is a global health care problem with evidence suggesting an increasing prevalence and incidence worldwide [ 4-6 ]. (medilib.ir)
  • It is typically a transitional rhythm between frequent premature atrial complexes (PACs) and atrial flutter / fibrillation. (dvfgm.de)
  • They can also occur when there is increased pressure on the atria such as in cardiac failure or mitral valve disease and may occur prior to the development of atrial fibrillation . (patient.info)
  • BACKGROUND: Atrial fibrillation (AF) is often detected for the first time in patients who are hospitalized for another reason. (bvsalud.org)
  • AIMS: Atrial fibrillation (AF) costs are expected to be substantial, but cost comparisons with the general population are scarce. (bvsalud.org)
  • Atrial fibrillation (AF) is reported to be a less frequent cause of ischemic stroke in China than in Europe and North America, but it is not clear whether this is due to underestimation. (biomedcentral.com)
  • Factors Modifying the Risk of Atrial Fibrillation Associated With Atrial Premature Complexes in Patients With Hypertension. (wakehealth.edu)
  • High-Sensitivity C-Reactive Protein and Risk of Stroke in Atrial Fibrillation (from the Reasons for Geographic and Racial Differences in Stroke Study). (wakehealth.edu)
  • O'Neal WT, Soliman EZ, Qureshi W, Alonso A, Heckbert SR, Herrington D. Sustained pre-hypertensive blood pressure and incident atrial fibrillation: the Multi-Ethnic Study of Atherosclerosis. (wakehealth.edu)
  • Qureshi W, Soliman EZ, Solomon SD, Alonso A, Arking DE, Shah A, Gupta DK, Wagenknecht LE, Herrington D. Risk factors for atrial fibrillation in patients with normal versus dilated left atrium (from the Atherosclerosis Risk in Communities Study). (wakehealth.edu)
  • He cares for patients with all types of heart rhythm disorders and is interested in both medical and procedural management of atrial fibrillation, atrial flutter, supraventricular tachycardia, and ventricular tachycardia. (ucsd.edu)
  • Dr. Hoffmayer focuses on complex ablation including atrial fibrillation, premature ventricular contractions (PVC) and ventricular tachycardia, including epicardial ventricular tachycardia ablation. (ucsd.edu)
  • Intracavitary studies may also be useful in many cases, even in atrial fibrillation/atrial flutter with small or apparently non‐existent "f" waves ( Figures 15.37 and 18.1 ). (thoracickey.com)
  • F waves of atrial fibrillation show low but variable voltages, being more evident in V1 (see Figures 15.25 and 15.26 ), whereas the typical common flutter waves display a sawtooth morphology with a predominant negative component in leads II, III, and VF (see Figure 15.33 ). (thoracickey.com)
  • To diagnose abnormal ECGs like Atrial Fibrillation during normal rhythm using signs invisible to the human eyes. (checkmecare.com)
  • Electrophysiology devices are primarily used for the diagnosis and treatment of diseases affecting the heart, including atrial fibrillation and ventricular fibrillation, and tachycardia. (pmarketresearch.com)
  • During atrial fibrillation, the AVN limited the number of action potentials transmitted to the ventricle. (cellml.org)
  • BrS is associated with an increased risk of syncope, palpitations, chest pain, convulsions, difficulty in breathing (nocturnal agonal breathing) and/or Sudden Cardiac Death (SCD) secondary to PVT/VF, unexplained cardiac arrest or documented PVT/VF or Paroxysmal atrial fibrillation (AF) in the absence of apparent macroscopic or structural heart disease, electrolyte disturbance, use of certain medications or coronary heart disease and fever. (bvsalud.org)
  • MAs may be manifested either in hemodynamic collapse or in cardiac arrest: The sudden loss of effective blood flow due to atrial fibrillation (AF) with rapid VT leads to hemodynamic collapse, and VT and VF result in cardiac arrest necessitating CPR or electric defibrillation. (medscape.com)
  • this is a novel mutation, in that it is associated with a gain-of-function mechanism and is associated with paroxysmal atrial fibrillation and no structural heart disease. (medscape.com)
  • INTRODUCTION: Hypergravitational exposures during human centrifugation are known to provoke dysrhythmias, including sinus dysrhythmias/tachycardias, premature atrial/ventricular contractions, and even atrial fibrillations or flutter patterns. (utmb.edu)
  • In particular, when the atrial rate is around 200 bpm, it is challenging to distinguish between atypical flutter and tachycardia due to an atrial macro‐reentry (MAT‐MR). In fact, these two arrhythmias could be considered the same (see Chapter 15 , Atrial flutter: ECG findings) from a morphological point of view, but different in terms of definitive treatment with ablation. (thoracickey.com)
  • Often, hypertension goes hand in hand with various atrial fibrillations including premature atrial contractions (PACs). (wikipedia.org)
  • Additional factors that may contribute to spontaneous premature atrial contractions could be: Increased age Abnormal body height Family history of heart disease History of cardiovascular disease (CV) Abnormal atrial natriuretic peptide (ANP) levels Elevated cholesterol Premature atrial contractions are typically diagnosed with an electrocardiogram, Holter monitor, long-term continuous monitor, cardiac event monitor, or with a smartwatch with an ECG functionality. (wikipedia.org)
  • Premature atrial contractions are often benign, requiring no treatment. (wikipedia.org)
  • In otherwise healthy patients, occasional single premature atrial contractions are a common finding and most of times do not indicate any particular health risk. (wikipedia.org)
  • Premature Atrial Contractions (PACs) Premature Atrial Contractions (PACs) are amongst the most common forms of arrhythmias. (dayofdifference.org.au)
  • In medicine, the medical term PACs stands for Premature Atrial Contractions. (dayofdifference.org.au)
  • Premature ventricular contractions have been described in 1% of clinically normal people as detected by a standard ECG and 40-75% of apparently healthy persons as detected by 24- to 48-hour ambulatory ECG recording [ 1 ] . (patient.info)
  • If 3 or more consecutive PACs occur in a row and at a frequency of 100 or more beats per minute, it may be called atrial tachycardia. (wikipedia.org)
  • Atrial premature complexes (APC), ventricular premature complexes (VPC), and supraventricular tachyarrhythmias are more prevalent than ventricular tachycardia, especially in women without structural heart disease. (hindawi.com)
  • As an assistant professor in the Department of Medicine, Dr. Hoffmayer conducts research on the electrophysiologic mechanisms and pathophysiology of atrial and ventricular arrhythmias, novel mapping and ablation techniques of ventricular tachycardia, safety and efficacy of antiarrhythmic therapy, body surface mapping and electrocardiographic imaging (ECGI), and cardiac resynchronization therapy. (ucsd.edu)
  • For instance, in the case of chaotic atrial tachycardia (see Figure 15.21 ), by definition, there is no dominant rhythm (see Chapter 15 , Chaotic atrial tachycardia). (thoracickey.com)
  • In an ECG tracing with narrow or broad QRS tachycardia, sometimes atrial activity is not observed because the atrial wave is hidden within the QRS complex (see Figure 15.13 A). Sometimes, it could be useful to take an ECG during deep breathing (see Figure 15.5 ) or during carotid sinus compression. (thoracickey.com)
  • In the case of monomorphic atrial tachycardia of ectopic focus (MAT‐EF), the algorithm shown in Figure 15.10 allows us to localize the atrial origin of the ectopic P′ wave (Kistler et al . (thoracickey.com)
  • The initial four QRS complexes have an atypical right bundle branch block morphology suggesting either ventricular tachycardia (VT) or a preexcited tachycardia. (mhmedical.com)
  • In such a situation, the differential diagnosis includes VT with 1:1 VA conduction, atrial tachycardia or AV node reentry with anterograde conduction over an accessory pathway (AP), and antidromic tachycardia with anterograde conduction over an AP and retrograde conduction over either a second septal AP or the normal VA conduction system. (mhmedical.com)
  • An atrial stimulus (S2) introduced during tachycardia at the MCS electrode site terminates tachycardia without conduction to the ventricle. (mhmedical.com)
  • A 46-year-old man with a history of recurrent palpitations and documented wide complex QRS tachycardia undergoes electrophysiologic study. (mhmedical.com)
  • Torsade de pointes is an uncommon and distinctive form of polymorphic ventricular tachycardia (VT) characterized by a gradual change in the amplitude and twisting of the QRS complexes around the isoelectric line (see the image below). (medscape.com)
  • Premature extra beats and sustained tachyarrhythmias are the most common arrhythmias in pregnancy. (hindawi.com)
  • Or is there evidence of atrial ventricular arrhythmias or any evidence of atrioventricular block? (medmastery.com)
  • vided that no complex arrhythmias exist. (lu.se)
  • Atrial Septal Defect. (vacante-insorite.ro)
  • A 2-dimensional echocardiographic picture taken from subxiphoid window showing a large secundum atrial septal defect (arrow) in a 7-year-old boy with Holt-Oram syndrome. (medscape.com)
  • Premature atrial contraction (PAC), also known as atrial premature complexes (APC) or atrial premature beats (APB), are a common cardiac dysrhythmia characterized by premature heartbeats originating in the atria. (wikipedia.org)
  • Typically, the atrial impulse propagates normally through the atrioventricular node and into the cardiac ventricles, resulting in a normal, narrow QRS complex. (wikipedia.org)
  • Figure 18.2 shows the morphology of atrial activation waves in the different supraventricular tachycardias with regular and monomorphic waves (see also Table 15.5 ) and Figures 18.3 and 18.4 show the different algorithms that, depending on whether atrial activity is present or not, allow us to determine the type of active supraventricular arrhythmia with narrow QRS and regular ( Figure 18.3 ) or irregular RR ( Figure 18.4 ). (thoracickey.com)
  • There is an abnormal P wave, usually followed by a normal QRS complex. (dvfgm.de)
  • An atrial premature beat is an extra heartbeat caused by electrical activation of the atria (upper chambers of the heart) from an abnormal site before a normal heartbeat would occur. (msdmanuals.com)
  • Catheter ablation success was defined as freedom from any sustained atrial arrhythmia recurrence after a 3-month blanking period following catheter ablation. (cepia.team)
  • all had an acute successful pulmonary vein isolation procedure, and 34 (33%) had atrial arrhythmia recurrences during a mean follow-up of 30±15 months (group 1). (cepia.team)
  • We searched on Pubmed for ventricular premature complexes (VPC) in pregnant women and found no case reporting increased incidence of this arrhythmia while supine. (hindawi.com)
  • This can be either a premature atrial contraction or a premature impulse from the atrioventricular node. (wikipedia.org)
  • SVES should be viewed in contrast to a premature ventricular contraction that has a ventricular origin and the associated QRS change. (wikipedia.org)
  • It is due to the premature discharge of an electrical impulse in the atrium, causing a premature contraction. (dayofdifference.org.au)
  • Therefore, it is named "premature atrial contraction," or PAC. (dayofdifference.org.au)
  • While the sinoatrial node typically regulates the heartbeat during normal sinus rhythm, PACs occur when another region of the atria depolarizes before the sinoatrial node and thus triggers a premature heartbeat, in contrast to escape beats, in which the normal sinoatrial node fails, leaving a non-nodal pacemaker to initiate a late beat. (wikipedia.org)
  • Since the premature beat initiates outside the sinoatrial node, the associated P wave appears different from those seen in normal sinus rhythm. (wikipedia.org)
  • Depending whether there are one, two, or three normal (sinus) beats between each PACs, the rhythm is called atrial bigeminy, trigeminy, or quadrigeminy. (wikipedia.org)
  • The normal heart rate and rhythm are determined by the sino-atrial node in the right atrium, which acts as the pacemaker for the heart. (patient.info)
  • When atrial activity is not observed, it may also be quite difficult to determine which the dominant rhythm is. (thoracickey.com)
  • However, the fact that no atrial activity is detected in the surface ECG even in the presence of slow heart rate is not conclusive evidence for atrial paralysis (see Figure 15.37 ), because the atrial rhythm may be concealed in the QRS complex or undetectable in the surface ECG ( Figure 15.37 ). (thoracickey.com)
  • nbsp;When the conduction impulses from SA nodes do not reach the ventricles for some reason or when the rate of these impulses falls below the base rate determined by the ventricular pacemaker cells, the impulses are generated by lower heart region, resulting in idioventricular rhythm or ventricle escape complexes commonly known as irregular heartbeats. (petyourdog.com)
  • A decrese in the frequency of sinus node pacemaker impulses or its blockage to the ventricles results in taking over of pacemaker role by lower heart region, which results in ventricular escape complexes or an idioventricular rhythm. (petyourdog.com)
  • In dogs with idioventricular rhythm, the P wave is either absent or hidden behind the QRS complex. (petyourdog.com)
  • However, a 2017 meta-analysis demonstrated that frequent premature atrial complexes were associated with an increased risk of stroke and death from all causes, cardiovascular diseases and coronary artery disease [ 2 ] . (patient.info)
  • Reentrant rhythms can usually be initiated and terminated by pacing or premature beats. (medscape.com)
  • Individuals with electrocardiographic evidence of ventricular premature beats had higher levels for each of the six variables tested than either normal individuals or those with premature atrial beats. (johnshopkins.edu)
  • The children of fathers with premature ventricular beats had significantly higher values for the six variables combined than did children of normal fathers. (johnshopkins.edu)
  • It is suggested that premature ventricular beats are associated with certain coronary heart disease risk factors and hence may presage a predisposition to coronary artery disease. (johnshopkins.edu)
  • The higher level of risk factors among children of fathers with premature ventricular beats suggests that the predisposition to coronary disease may begin at early age. (johnshopkins.edu)
  • When you see premature beats, you need to identify whether they are coming from the atria or the ventricles. (medmastery.com)
  • Atrial premature beats occur in many healthy people and rarely cause symptoms. (msdmanuals.com)
  • Atrial premature beats only rarely cause symptoms. (msdmanuals.com)
  • Premature P waves, usually different from the sinus p-wave in morphology. (ecgmadesimple.ca)
  • The atrial wave morphology suggests sinus or ectopic origin. (thoracickey.com)
  • In torsade, the morphology of the QRS complexes varies from beat to beat. (medscape.com)
  • After premature stimulation, atrioventricular nodal reentry could occur. (cellml.org)
  • Notice the unconducted atrial premature complexes (APCs) superimposed on the ST segment of the previous depolarization (arrows) that appear in a bigeminal pattern. (avma.org)
  • The P wave represents atrial depolarization and the QRS represents ventricular depolarization. (petyourdog.com)
  • The last two QRS complexes show no evidence of anterograde AP conduction. (mhmedical.com)
  • This was a very unusual AP that only became manifest with multiple premature atrial extrastimuli that resulted in block over the AV node and a very long conduction time over the AP. (mhmedical.com)
  • The relationship between the AVN conduction time and the timing of a premature stimulus (conduction curve) is consistent with experimental data. (cellml.org)
  • These atrial dysrhythmias primarily affect the P wave. (ekg.academy)
  • Heart rate (a) and ventricular premature complexes (b) during 24-hour Holter monitoring. (hindawi.com)
  • What is the relationship between the P waves and QRS complexes? (vin.com)
  • There is no connection between the P waves and the QRS complex on the ECG graph. (petyourdog.com)
  • The cadence of atrial activity may be regular or irregular. (thoracickey.com)
  • However, if the atrial beat is premature enough, it may reach the atrioventricular node during its refractory period, in which case it will not be conducted to the ventricle and there will be no QRS complex following the P wave. (wikipedia.org)
  • citation needed] A supraventricular extrasystole (SVES) is an extrasystole or premature electrical impulse in the heart, generated above the level of the ventricle. (wikipedia.org)
  • They occur when there is electrical discharge from somewhere in the heart other than the sino-atrial node. (patient.info)
  • Holt-Oram syndrome (HOS) (OMIM 142900) is a heart-upper limb malformation complex with an autosomal dominant inheritance and near-complete penetrance but variable expression. (medscape.com)
  • Using these models, together with models for the sinoatrial node (SAN) and atrial muscle, we have developed a one-dimensional (1D) multicellular model including the SAN and AVN. (cellml.org)
  • When the current codes and descriptors were written in 2011, 3D mapping, left-atrial pacing, and ICE were not typically performed with the underlying ablations. (acc.org)