OBJECTIVE--To study the prevalence and the characteristics of physiological valve regurgitation. DESIGN--Pulsed wave Doppler echocardiography, continuous wave Doppler echocardiography and Doppler colour flow mapping were performed prospectively in healthy volunteers. SETTING--Echocardiography laboratory in a city hospital. PATIENTS--32 consecutive healthy volunteers (age 21-49 years, mean age 29.4). MAIN OUTCOME MEASURES--Identification of regurgitation with colour Doppler flow mapping and measurement of the jet area, jet length, and maximal velocity of the regurgitation. RESULTS--Regurgitation was recorded at the pulmonary (100%), tricuspid (100%), mitral (56%), and aortic valves (6%). The velocity of pulmonary and tricuspid regurgitation was similar to that predicted from the pressure gradient calculated from the Bernoulli equation. The jet area and jet length were generally small. CONCLUSION--Trivial regurgitation from the pulmonary, tricuspid, and mitral valves is common in healthy people. ...
TY - JOUR. T1 - Clinical determinants of elevated systolic pulmonary artery pressure measured by transthoracic Doppler echocardiography in early systemic sclerosis. AU - EUSTAR co-authors. AU - Carreira, Patricia E.. AU - Carmona, Loreto. AU - Joven, Beatriz E.. AU - Loza, Estibaliz. AU - Andreu, José Luis. AU - Riemekasten, Gabriela. AU - Vettori, Serena. AU - Allanore, Yannick. AU - Balbir-Gurman, Alexandra. AU - Airò, Paolo. AU - Walker, Ulrich A.. AU - Damjanov, Nemanja. AU - Ananieva, Lidia P.. AU - Rednic, Simona. AU - Czirják, L.. AU - Distler, Oliver. AU - Farge, Dominique. AU - Hesselstrand, Roger. AU - Corrado, Ada. AU - Caramaschi, Paola. AU - Tikly, Mohammed. AU - Matucci-Cerinic, Marco. PY - 2017/1/1. Y1 - 2017/1/1. N2 - Objective. To explore the prevalence and clinical associations of elevated systolic pulmonary artery pressure (sPAP), measured by Transthoracic Dopplerechocardiography (TTE) in patients with early systemic sclerosis (SSc). Methods. A cross-sectional analysis of ...
Doppler echocardiographic evaluation of patients with porcine mitral valves.: The application of Doppler echocardiography to the study of valvular function has
Practical Quantitative Doppler Echocardiography by John H Phillips starting at $73.41. Practical Quantitative Doppler Echocardiography has 1 available editions to buy at Alibris
TY - JOUR. T1 - Performance of two-dimensional Doppler echocardiography for the assessment of infarct size and left ventricular function in rats. AU - Nozawa, E.. AU - Takeuchi, Rosemeire. AU - Murad, N.. AU - Carvalho, A. C C. AU - Cravo, S. L D. AU - Campos, O.. AU - Tucci, P. J F. AU - Moises, V. A.. PY - 2006/5. Y1 - 2006/5. N2 - Although echocardiography has been used in rats, few studies have determined its efficacy for estimating myocardial infarct size. Our objective was to estimate the myocardial infarct size, and to evaluate anatomic and functional variables of the left ventricle. Myocardial infarction was produced in 43 female Wistar rats by ligature of the left coronary artery. Echocardiography was performed 5 weeks later to measure left ventricular diameter and transverse area (mean of 3 transverse planes), infarct size (percentage of the arc with infarct on 3 transverse planes), systolic function by the change in fractional area, and diastolic function by mitral inflow parameters. ...
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TY - JOUR. T1 - Progression of aortic stenosis in adults. T2 - Newappraisal using doppler echocardiography. AU - Roger, Veronique L.. AU - Tajik, A. Jamil. AU - Bailey, Kent R.. AU - Oh, Jae K.. AU - Taylor, Catherine L.. AU - Seward, James B.. PY - 1990/2. Y1 - 1990/2. N2 - This study examined progression of aortic stenosis (AS) as assessed by Doppler echocardiography. One hundred twelve consecutive adult patients had calcific AS and underwent three examinations during a mean 25-month period (range 7 to 54 months). At the time of entry into the study, mean values for initial peak aortic velocity and ejection fraction (EF) were 2.9±0.7 m/sec and 63±10%, respectively; 52% of the patients were symptomatic. At the third examination the percentage of symptomatic patients increased to 65% (p=0.0039 compared to baseline values), and the aortic peak velocity increased to 3.3±0.8 m/sec (p,0.001). Age, sex, and EF were not predictors of progression. Documented coronary artery disease (in 57 patients) ...
Background- Restrictive mitral filling pattern (RFP), the most severe form of diastolic dysfunction, is a predictor of outcome after acute myocardial infarction (AMI). Low power has precluded a definite conclusion on the independent importance of RFP, especially when overall systolic function is preserved. We undertook an individual patient meta-analysis to determine whether RFP is predictive of mortality independently of LV ejection fraction (LVEF), end-systolic volume index, and Killip class in patients after AMI.. Methods and Results- Twelve prospective studies (3396 patients) assessing the relationship between prognosis and Doppler echocardiographic LV filling pattern in patients after AMI were included. Individual patient data from each study were extracted and collated into a single database for analysis. RFP was associated with higher all-cause mortality (hazard ratio, 2.67; 95% CI, 2.23 to 3.20; P,0.001) and remained an independent predictor in multivariate analysis with age, gender, and ...
... auf frohberg.de - This book covers the full range of Doppler echocardiography in infants and children,...
Apical ballooning syndrome (ABS) and obstructive coronary artery disease of the left anterior descending coronary artery (LAD) can both result in similar left ventricular apical wall motion abnormalities. The right ventricle may more likely be involv
Aliasing is associated only with pulsed Doppler, it never appears with continuous wave Doppler. A standard continuous wave Doppler has a receiver and a transmitter. The transmitter produces continuous sound waves which the receiver collects. Both elements are positioned at specific angles from one another enabling the receiver to receive reflected ultrasound waves.. The disadvantage of using a continuous wave Doppler is the range ambiguity. With this technique, velocities along the entire region of overlap between the transmit and receive beams, blend together to form the spectrum. With pulsed Doppler, velocities from blood within the sample volume are measured.. Eliminating aliasing "improves the ability to measure the maximum velocity with Doppler".. ...
Renal dysfunction is associated with a variety of cardiac alterations including left ventricular (LV) hypertrophy, LV dilation, and reduction in systolic and diastolic function. It is common and associated with an increased mortality risk in heart failure (HF) patients. This study was designed to evaluate whether severe diastolic dysfunction contribute to the increased mortality risk observed in HF patients with renal dysfunction ...
BACKGROUND AND AIM: QRS amplitude and duration are associated with increased left ventricular (LV) volume, mass and dysfunction. However, the diagnostic concordance between QRS measurements and LV morphology and function, as shown by Doppler echocardiography, is not well established. We investigated the relationships of QRS duration and amplitude with echocardiographic measurements of LV morphology and systolic and diastolic function in normal individuals. METHODS: Individuals without signs or symptoms of coronary artery disease or heart failure, who underwent clinical examination as a part of a cross-sectional survey for the prevalence of coronary risk factors, randomly selected from the population list in Caltanissetta, Italy, were included in the study ...
A total of 38 patients (mean age 62 ± 14 years, 71% men, 57% with New York Heart Association class , 2) with suspected CA underwent electrocardiography (ECG), TTE (including tissue Doppler), DHE-CMR (Siemens 1.5 T scanner, Erlangen, Germany) and EMB between 1/05 and 4/08. Low voltage on ECG was defined as sum of S wave in lead V1 + R wave in lead V5 or V6 , 15 mm. Measured TTE parameters included left atrial size, interventricular septal thickness, speckled appearance, E/A ratio, E/E ratio, stage of diastology, deceleration time (msec) and myocardial performance index [(isovolumic contraction time + isovolumic relaxation time)/ejection time]. DHE-MR images were obtained in standard long and short axis orientations (covering the entire LV), after injection of Gadolinium dimenglumine using an inversion recovery spoiled gradient echo sequence: TE 4 msec, TR 8 msec, flip angle 30°, bandwidth 140 Hz/pixel, 23 k-space lines acquired every other RR-interval, field of view (varied from 228-330 in the ...
Introduction: Disturbances of diastolic function precede systolic heart failure and, although clinically silent, represent the earliest sign of cardiac involvement. Diastolic dysfunction (DD) is associated with age, female, and hypertension.. Hypothesis: However, little is known about the age-specific incidence rates and risk factors for diastolic dysfunction in patients with rheumatoid arthritis (RA).. Methods: We used standard two-dimensional/Doppler echocardiography to screen for the presence of diastolic dysfunction in 61 patients with RA and 107 healthy subjects. All participants were premenopausal women without a history of hypertension and with preserved ejection fraction. DD was defined as impaired relaxation with or without increased filling pressures.. Results: The two groups were similar with respect to age (48.1±7.9 years vs 47.3±9.4 years, P=0.269). Patients with RA had significantly higher left ventricular (LV) mass index and LV filling pressure than controls. DD was more common ...
Cardiovascular Diagnosis by Ultrasound: Transesophageal, Computerized, Contrast, Doppler Echocardiography by Peter Hanrath full download exe or rar online without authorization for free.
PubMed comprises more than 30 million citations for biomedical literature from MEDLINE, life science journals, and online books. Citations may include links to full-text content from PubMed Central and publisher web sites.
Ecografía Doppler (es); Échographie Doppler (fr); Доплерография (ru); Farbkodierte Doppler-Sonografie (de); Siêu âm Doppler (vi); اکوکاردیوگرافی دوپلر (fa); 多普勒超聲 (zh); ドップラー心エコー (ja); USG dopplerowskie (pl); duplexonderzoek (nl); 多普勒超聲 (zh-hant); Ecografía Doppler (gl); Ecografia Doppler (it); Doppler echocardiography (en); الدوبلر الطبي (ar); 多普勒超声 (zh-hans); Ecografia Doppler (ca) tecnica non cruenta e non invasiva quindi facilmente ripetibile utilizzata in medicina per lo studio della situazione anatomica e funzionale dei vasi sanguigni, arteriosi e venosi, e del cuore in tempo reale (it); ultrasound procedure to examine the heart or blood vessels (en); Form der Ultraschalluntersuchung (de); Examen médical. (fr) Ecodoppler, Ecografia doppler, EcoDoppler, Ecocolor Doppler, Ecocolordoppler (it); échographie vasculaire, échographie Doppler vasculaire, échocardiographie-doppler (fr); ...
TY - JOUR. T1 - Fetal Doppler echocardiography. AU - Reed, Kathryn L. PY - 1989. Y1 - 1989. UR - http://www.scopus.com/inward/record.url?scp=0024827199&partnerID=8YFLogxK. UR - http://www.scopus.com/inward/citedby.url?scp=0024827199&partnerID=8YFLogxK. U2 - 10.1097/00003081-198912000-00014. DO - 10.1097/00003081-198912000-00014. M3 - Article. C2 - 2692908. AN - SCOPUS:0024827199. VL - 32. SP - 728. EP - 737. JO - Clinical Obstetrics and Gynecology. JF - Clinical Obstetrics and Gynecology. SN - 0009-9201. IS - 4. ER - ...
In patients with type 1 diabetes mellitus (T1DM) imaging studies have demonstrated an increased prevalence of left ventricular diastolic dysfunction and increased left ventricular mass (LVM) unrelated to arterial hypertension and ischemic heart disease. The aim of our study was to identify potential predictors of early subclinical changes in cardiac chamber size and function in such patients. Sixty-one middle-aged asymptomatic normotensive patients with T1DM were included in the study. Conventional and tissue Doppler echocardiography was performed and fasting serum levels of glucose, glycated hemoglobin (HbA1c), lipids, and creatinine were measured. We found moderate bivariate correlations of body mass index (BMI) with left atrial volume (r = 0.47, p , 0.01), LVM (r = 0.42, p , 0.01), left ventricular relative wall thickness (r = 0.32, p = 0.01), and all observed parameters of diastolic function of both ventricles. The five-year average value of HbA1c weakly correlated with the Doppler index of ...
Tissue Doppler imaging and strain rate imaging are quantitative methods for assessing myocardial function and have been shown to overcome the limitations of current ultrasound methods in assessing the complex changes in regional myocardial function that occur in differing ischemic substrates. Tissue Doppler imaging (TDI) measures in real time the myocardial velocity gradient which is an index of myocardial deformation. Strain and strain rate (SR) imaging has been shown to be a sensitive technique for quantifying regional myocardial deformation. Strain rate is less load-dependent that strain and provides therefore a better measure of contractility. In the setting of ischemia, experimental studies have shown that strain imaging was an accurate method for quantitative evaluation of regional myocardial function and may yield important physiological data. In myocardial infarction, transmural extension of scar distribution in the infarct zone is proportionally related to the reduction in systolic ...
An echo Doppler is a medical test used to detect the size, shape, and motion of the heart. Doctors often order an echo Doppler if...
PubMed comprises more than 30 million citations for biomedical literature from MEDLINE, life science journals, and online books. Citations may include links to full-text content from PubMed Central and publisher web sites.
In hypertensive patients the propensity to develop organ damage is under the influence of several factors, including the existence of a prothrombotic state. We tested the hypothesis that an activated hemostatic system is associated with left-ventricu
One of the major criticisms of ultrasound Doppler is its angle dependency, that is its ability to measure velocity components directly to or from the transducer only. The present article aims to investigate the impact of this angular error in a clinical setting. Apical two- and four-chamber views were recorded in 43 individuals, and the myocardium was marked by hand in each image. We assume that the main direction of the myocardial velocities is longitudinal and correct for the angular error by backprojecting measured velocities onto the longitudinal direction drawn. Strain was calculated from both corrected and uncorrected velocities in 12 segments for each individual. The results indicate that the difference between strain values calculated from corrected and uncorrected velocities is insignificant in 5 segments and within a decimal range in 11 segments. The biggest difference between measured and corrected strain values was found in the apical segments. Strain is also found to be more robust ...
Among the 51 patients (34 males, aged 54 ± 14 years) who received ECMO for medical (n = 27), postcardiotomy (n = 11), or posttransplantation (n = 5) cardiogenic shock, 38 tolerated at least one ECMO flow reduction trial and 20 were ultimately weaned. Compared with the 13 patients who tolerated the trial but were not deemed weanable, those successfully weaned had, at each ECMO flow level, higher arterial systolic and pulse pressures, VTI, LVEF, and lateral mitral annulus peak systolic velocity (TDSa). All weaned patients had aortic VTI ≥10 cm, LVEF ,20-25%, and TDSa ≥6 cm/s at minimal ECMO flow support. These Doppler echocardiography parameters better separated weaned and nonweaned patients than any other parameters tested.. ...
After disrobing from the waist up, you will be given a gown and asked to lie down on an exam table. Electrodes are attached to your chest for an electrocardiogram (ECG) at the same time. The ECG helps with the interpretation of the echocardiogram and evaluating the electrical impulses in the heart. The lights will be dimmed so the technician can see your hearts image on the screen more clearly. The Doppler echocardiogram uses colors to indicate the varying speed of your blood as it flows through the heart. The technician spreads gel on your chest and then firmly presses the transducer against your skin, aiming the ultrasound beam through your chest. You may be asked to breathe in a certain way or to roll over onto one side. The transducer uses high-frequency sound waves, which are beyond the range of normal hearing. However, you may hear a pulsing "whoosh" sound, which is the machines approximation of blood flowing past the structures in your heart. The computer then uses the information from ...
second) was identified as the highest velocity produced after the onset of velocity. Acceleration (in degree per second squared) was calculated as the linear slope of the velocity-time curve (Δvelocity/Δtime) from velocity onset to 2 deg/s below the PV attained. The onset of velocity was defined as 2 deg. ...
Objective: To evaluate the value of two-dimensional strain rate imaging (STE) in detecting the alteration of regionally left ventricular long-axis sys..
In this study we sought to assess the clinical significance of peak negative MVG derived from TDI as a noninvasive indicator of LV diastolic function. By comparing peak negative MVG among patients with or without impairment of systolic and diastolic performance, we have demonstrated that peak negative MVG reflected diastolic abnormalities in these patients. We have also found that peak negative MVG was relatively independent of preload alterations because peak negative MVG was unaltered, while the transmitral flow velocity indices were significantly altered, by passive leg lifting maneuver. Finally, we have found that peak negative MVG showed an improvement by volume-reducing therapy in contrast to the transmitral flow velocity indices, which apparently worsened toward an abnormal relaxation pattern. Thus, peak negative MVG may be a noninvasive indicator of LV diastolic function that is relatively independent of preload alterations, and thereby could be used for the follow-up of patients with ...
Atrial fibrillation (AF) is the most frequent form of arrhythmia, and the number of patients with AF has increased with the rapid aging of society (1). AF is an important risk factor for heart failure (2), wherein left ventricular (LV) diastolic function is more closely related to the symptoms, exercise tolerance, and prognosis of patients compared with systolic function (3,4). In the clinical setting, LV diastolic function is mainly evaluated by the transmitral flow velocity pattern using Doppler echocardiography. Evaluation of LV diastolic function is also needed in patients with AF which is extremely challenging because of the lack of atrial systolic transmitral flow wave and the irregularity of Doppler parameters caused by irregular R-R intervals (5-7).. As an alternative method for evaluating LV diastolic function, mitral annular velocity waveforms, which can be recorded using tissue Doppler echocardiography, have been used. The ratio of early diastolic transmitral flow velocity (E) to ...
Doppler echocardiography was used to evaluate blood flow in the pulmonary artery in 14 patients 2 to 42 months (mean (SD) 17 (12) months) after a modified Fontan operation incorporating a direct atriopulmonary anastomosis. Preoperatively six patients had tricuspid atresia, six had a double inlet left ventricle, and two had pulmonary atresia with an intact ventricular septum. The postoperative rhythm was sinus in 11 patients, junctional in one, ventricular pacing in one, and atrioventricular sequential pacing in one. In one patient the Doppler trace was unsatisfactory for analysis. In all patients forward flow in the pulmonary artery had biphasic peaks related to both atrial and ventricular contraction. The mean (SD) peak flow velocity that was synchronous with atrial contraction was 80 (30) cm/s and that synchronous with ventricular contraction was 74 (23) cm/s. The atrial contribution to total pulmonary artery flow, assessed by velocity-time integrals, varied between 22% and 73% (mean (SD) 45 ...
TY - JOUR. T1 - Accuracy of cardiac output estimation with biplane transesophageal echocardiography.. AU - Hozumi, T.. AU - Shakudo, M.. AU - Applegate, Richard Lee. AU - Shah, P. M.. PY - 1993/1. Y1 - 1993/1. N2 - To evaluate the accuracy of cardiac output measurements with biplane transesophageal Doppler echocardiography, we examined 26 sets of observations in 14 patients using thermodilution technique as the standard. A mitral inflow method by single-plane combined the time-velocity integral of mitral inflow at the mitral annulus with the area of mitral annulus, assuming it to be a circular shape, by use of either the four- or the two-chamber view. With both views, a mitral inflow method by biplane combined the average of time-velocity integral of mitral inflow from the four- and the two-chamber views with the area of mitral annulus, assuming it to be an ellipsoid shape. The correlation coefficients between thermodilution and single-plane method of cardiac output were 0.81 (SEE = 0.72 L/min) ...
TY - JOUR. T1 - The Prognostic Value of Pulmonary Vascular Capacitance Determined by Doppler Echocardiography in Patients with Pulmonary Arterial Hypertension. AU - Mahapatra, Srijoy. AU - Nishimura, Rick A.. AU - Oh, Jae Kuen. AU - McGoon, Michael D.. PY - 2006/8. Y1 - 2006/8. N2 - Objectives: We sought to determine if a novel measurement of pulmonary vascular (PV) capacitance (PVCAP) by Doppler echocardiography predicts all-cause mortality in patients with primary pulmonary arterial (PA) hypertension (PPAH). Background: The prognosis of patients with PPAH is variable and has been difficult to predict using clinical or hemodynamic parameters. PVCAP is a measure of the workload on the right ventricle (RV) and we recently have shown that PVCAP determined by cardiac catheterization is a strong predictor of survival. This same hemodynamic information to calculate PVCAP can be derived from Doppler echocardiography. Therefore, the purpose of this study was to determine if PVCAP from noninvasive ...
Thirty adult patients with aortic stenosis had Doppler echocardiography within 1 day of cardiac catheterization. Noninvasive measurement of the mean transaortic pressure gradient was calculated by applying the simplified Bernoulli equation to the continuous wave Doppler transaortic velocity recording. Stroke volume was measured noninvasively by multiplying the systolic velocity integral of flow in the left ventricular outflow tract (obtained by pulsed Doppler ultrasonography) by the cross-sectional area of the left ventricular outflow tract (measured by two-dimensional echocardiography). Non-invasive measurement of aortic valve area was calculated by two methods. In method 1, the Gorlin equation was applied using Doppler-derived mean pressure gradient, cardiac output and systolic ejection period. Method 2 used the continuity equation. These noninvasive measurements were compared with invasive measurements using linear regression analysis, and mean pressure gradients correlated well (r = 0.92). ...
This manual introduces the extraordinary diagnostic possibilities of Transesophageal Color Doppler Echocardiography and therefore enables readers to recognize and diagnose a wide range of heart diseases.The atlas covers a comprehensive collection ofMoreThis manual introduces the extraordinary diagnostic possibilities of Transesophageal Color Doppler Echocardiography and therefore enables readers to recognize and diagnose a wide range of heart diseases.The atlas covers a comprehensive collection of cardiac pathology, selected from routine perioperative examinations.. A CD-ROM will also be available, offering more than 160 movies of examinations and covering all important heart diseases such as abnormalities of the valves. ...
Pulmonary arterial pressure (PAP) represents an important prognostic factor in patients affected by chronic obstructive pulmonary disease (COPD). A noninvasive diagnostic approach is offered by several imaging techniques, such as chest X-ray, nuclear medicine, real-time sonography, color Doppler US, CT and MRI. However, at present a quantitative assessment of PAP is not achieved with reasonable precision with any of these techniques. Tricuspid regurgitation can be estimated by continuous wave Doppler but it may be difficult in patients with COPD. On the contrary, the severity of pulmonary hypertension can be accurately assessed with pulsed Doppler echocardiography from the subxiphoid region, using a general purpose US device. Nineteen adult patients with COPD were studied by duplex-Doppler from an oblique subxiphoid approach and right heart catheterization. The study was diagnostic in all cases with quality Doppler recordings. A significant relationship was found between AcT and pulmonary mean or
In a number of patients with EF 60% or more, signs of heart failure are clinically detected. As a rule, such a condition is caused by LV diastolic dysfunction (impaired relaxation processes due to ischemia, cardiosclerosis, hypertrophy of the walls, pericardial effusion, etc.). According to a number of researchers, patients with signs of heart failure caused only by diastolic dysfunction constitute 15-25% of all patients with HF.. Diastolic dysfunction of the LV is estimated according to the results of a study of transmitral diastolic blood flow in a pulsed mode. Determine: 1. the maximum speed of the early peak of the diastolic filling M1, 2. the maximum speed in the atrial systole M2, 3. the integral of speed (area under the curve) of the early diastolic filling (VTI E), 4. the integral of the speed of atrial systole (VTI A), 5 LV isovolumetric relaxation time (IVRT), 6. time to slow the early diastolic filling (DT).. In the early stages of LV diastolic dysfunction with a slight increase in ...
Left atrial volume (LAV) provides the significant prognostic information in the general population and patients with heart disease, including acute myocardial infarction, left ventricular dysfunction, mitral regurgitation, cardiomyopathy and atrial fibrillation. Large left atrial volume, which represents chronic diastolic dysfunction, is associated with poor outcome, regardless of systolic function. Thereby, LAV provides a long-term view of whether or not the patient has the disease of diastolic dysfunction, regardless of whatever loading conditions are present at the time of the examination, as the hemoglobin A1C in diabetes. However, whether left atrial (LA) parameters could correlate with LVFP and reflect short-term change in left ventricular filling pressure(LVFP) remains unknown. Only one article of our team confirmed the relationship between LAV and LVFP in patients with severe mitral regurgitation by simultaneous echocardiography-catheterization. The prior report proposed a new parameter, ...
TY - JOUR. T1 - Impact of ventricular dyssynchrony on postexercise accommodation of systolic myocardial motion in hypertensive patients with heart failure and a normal ejection fraction. T2 - A tissue-Doppler echocardiography study. AU - Wang, Yi Chih. AU - Yu, Chih Chieh. AU - Chiu, Fu Chun. AU - Klepfer, Ruth. AU - Hilpisch, Kathryn. AU - Splett, Vincent. AU - Tsai, Chia Ti. AU - Lai, Ling Ping. AU - Hwang, Juey Jen. AU - Lin, Jiunn Lee. PY - 2012/2/1. Y1 - 2012/2/1. N2 - Background: We hypothesized left ventricular (LV) dyssynchrony would affect postexercise accommodation of regional myocardial motion in patients with heart failure and a normal ejection fraction (HFNEF). Methods and Results: Tissue-Doppler echocardiography was studied in 100 hypertensive patients with LV ejection fraction ,50%. Among them, 70 HFNEF patients were classified into the systolic dyssynchrony (Dys: ,65 ms difference of electromechanical delay between septal and lateral segments) (43 patients) and nondyssynchrony ...
Objective: To determine the efficacy of using echocardiography, compared with cardiac catheterization, to diagnose elevated left ventricular filling pressure (LVFP), according to the 2016 American Society of Echocardiography and the European Association of Cardiovascular Imaging (ASE/EACVI) recommendations, among patients with at least one coronary
Echocardiographic Workshop on 2-D and Doppler Echocardiography at Vail is a cardiovascular CME conference that will provide a comprehensive review of state-of-the-art 2-D, Doppler and transesophageal echocardiography with a strong emphasis on newer and more rapidly changing areas. Find more cardiology conferences here!
Chemical Engineering Assignment Help, bernoulli equations, air flows through apipe at arte of 200L/S. The pipe of two sections of diameters 20cm and 10cm with asmoth reducing section the pressure are difference between the two pipe section is measured by awater manometer . Neglecting Frictional effects dete
TY - JOUR. T1 - Tissue Doppler imaging of the fetal heart. AU - Paladini, D.. AU - Lamberti, A.. AU - Teodoro, A.. AU - Arienzo, M.. AU - Tartaglione, A.. AU - Martinelli, P.. PY - 2000. Y1 - 2000. N2 - Objectives: The objectives of this study were: (i) to assess the feasibility of a tissue Doppler imaging (TDI) evaluation in the fetus, (ii) to identify color-TDI patterns consistent with the various phases of the cardiac cycle; and (iii) to assess myocardial velocities and the myocardial velocity gradient. Methods: Eighty-nine normal fetuses between the 17th and the 37th week of gestation were studied. Color-TDI was superimposed on an apical four-chamber view of the fetal heart and three cardiac cycles captured in cine-loop format. By reviewing the cine-loop strip, color patterns consistent with the various phases of the cardiac cycle were identified. The procedure was then repeated with a transverse four-chamber view. On each frame corresponding to mid-systole, early and late diastole, ...
Citation: Mohamed R. Morsi , Evidence of valve regurgitation by doppler echocardiography in patients with rheumatic fever without clinical carditis, Alex. J. Pediatr. 1994; 8 (3): 341-6 ...
Standard apical 2- and 4-chamber views were obtained. LV end-systolic and end-diastolic volumes were obtained by planimetry with the biplane method of discs as described (9). The LVEF was calculated as (end-diastolic volume − end-systolic volume)/end-diastolic volume.. Left and right atrial volumes were obtained at end-ventricular systole by manual planimetry with the biplane method of discs for the left atrium and single plane method of discs for the right atrium, as previously described and validated (10). All chamber volumes were subsequently indexed to body surface area.. LV mass was calculated with a truncated ellipsoid equation and indexed to body surface area as previously described and validated (9,11).. The tricuspid regurgitation jet was visualized with color flow mapping, and continuous wave Doppler was used to capture the flow signal from measurement of peak tricuspid regurgitant velocity. The peak tricuspid regurgitant velocity for the current study was the highest measurement ...
BACKGROUND: Myocardial dysfunction in children diagnosed with mitochondrial disease is an ominous sign and has been associated with substantial increased mortality rates. Early detection of cardiac involvement would therefore be desirable. Two dimensional strain echocardiography (2DSTE) has proven to be more sensitive than conventional echocardiography for the detection of early myocardial dysfunction in various (cardiac) conditions. AIMS: To determine left ventricular systolic function in children with mitochondrial disorders by means of physical examination, electrocardiography (ECG), conventional echocardiography and 2DSTE. METHODS: A total of 27 children with established mitochondrial disease and 54 age-matched control subjects underwent cardiac evaluation. Longitudinal, circumferential and radial peak systolic strain (S) values were determined as well as peak systolic strain rate (Sr) and the time to peak global systolic strain (T2P). One Way analysis of Variance was performed to assess the ...
Doppler echocardiography is a fundamental instrument to understand heart damage during essential arterial hypertension. Left ventricular (LV) hypertrophy may also be conveniently studied in its morphological and functional aspects by ultrasound application. Echocardiography can also provide important morphological and functional information in hypertensive patients for therapeutic management and prognostic stratification. In recent years, echocardiography has been enriched by very refined techniques that are capable of studying the physiopathological intramyocardial phenomena: (i) tissue Doppler (which studies intramyocardial velocities and time intervals and allows the analysis of strain and strain rate); (ii) integrated backscatter (which analyzes variations of myocardial reflectivity in decibels); (iii) transthoracic Doppler derived coronary flow reserve (which quantifies the vasodilator response of coronary velocities to a hyperaemic stimulation); (iv) myocardial echo-contrast- ...
The extent to which Doppler echocardiography information can be used in the assessment of prosthesis hemodynamic performance is still controversial. The goals of our study were to assess the importance of valve design and size both on Doppler echocardiography findings and on pressure recovery in a fluid mechanics model. We performed Doppler and catheter measurements in the different orifices of the bileaflet St Jude (central and side orifices), the monoleaflet Omnicarbon (major and minor orifices), and the stented Biocor porcine prosthesis. Net pressure gradients were predicted from Doppler flow velocities, assuming either independence or dependence of valve size. The peak Doppler estimated gradients (mean +/- SD for sizes 21 to 27) were 21 +/- 10.3 mm Hg for St Jude, 18 +/- 9.3 mm Hg for Omnicarbon, and 37 +/- 14.5 mm Hg for Biocor (P ,.05 for St Jude and Omnicarbon vs Biocor). The pressure recovery (proportion of peak catheter pressure) was 53% +/- 8.6% for central-St Jude, 29% +/- 8. 9% for ...
Read about how non-invasive Doppler echocardiography is useful in detecting pulmonary hypertension in patients with interstitial lung disease.