شكل موجة الدوبلر النبضي لمخرج البطين الايمن وعلاقتها بشدة ارتفاع ضغط الدم الرئوي == Shape of the right ventricular outflow Doppler envelope and severity of pulmonary hypertension
Author name:
محمد خالد عبد الكريم
Supervisor name:
باسل نجيب سعيد الدليمي
General topic:
Medicine
Specific topic:
Echocardiography
Degree:
Higher Diploma
University:
University of Baghdad - Faculty Of Medicine
Language:
English
University location:
Baghdad
First pages:
19T1276 - p.pdf
Abstract:
Design : cross sectional descriptive study .Setting : Baghdad teaching hospital and Iraqi center of heart diseases.Duration : Beginning of September 2014 to end of August 2015 .Background : Pulmonary arterial hypertension is defined as a group of diseases characterized by a progressive increase in pulmonary vascular load, leading to marked increase in pulmonary artery pressure(PAP) . Although direct pressure measurement with right heart catheterization is the reference method and “gold standard” for quantification of pulmonary artery pressure, The invasive nature of catheterization makes it unsuitable for frequent and repeated use. Alternatively, echocardiography offers the advantages of noninvasiveness and versatility and is commonly used to estimate systolic pulmonary artery pressure . Unfortunately, not all of these echocardiographic variables are always present and at times an adequate jet of tricuspid regurgitation (TR) is not available to provide a very satisfactory estimate of the magnitude of pulmonary hypertension (PH) . The pulsed - wave Doppler of Right ventricular outflow tract (RVOT) velocity curve provides a wealth of physiologic information about RV and pulmonary vascular function. Doppler recordings from the RVOT are available in virtually all patients . Moreover, the shape of the Doppler profile in the Right ventricular outflow contains other physiological insights and it is simple to use in clinical practice .Aim : We devised a study to determine whether visual assessment of the right ventricular outflow Doppler signals can be useful identifying the severity of pulmonary hypertension .Patients and methods : We used a pulsed Doppler technique to examine the flow velocity pattern in the RVOT in 127 patients. Inclusion criteria all patients had a complete echocardiogram including pulsed Doppler spectral signals across the RVOT, discernible tricuspid regurgitation signal, good endocardial border resolution of both right and left ventricular chambers for tracing of the end - systole and end - diastole , as well as M - mode of the lateral tricuspid annulus .In addition, all these patients included for the analysis were in normal sinus rhythm . Exclusion criteria : no atrial or ventricular ectopy or other cardiac arrhythmia was present at the time of the study, none of the patients had a pacer or defibrillator wire in the right ventricle (RV). No previous cardiac surgery .Result : Visual inspection of RVOT spectral Doppler signals from the 127 showed four dynamic patterns , pulmonary artery systolic pressure (PASP)was significantly correlated with these different types of RVOT spectral Doppler signals . Both TR pressure gradient (PG) and PASP increased significantly from groups I to IV with p value ˂ 0.05, mean pulmonary PASP was 32.92 in pattern I, 56.07 in pattern II , 73.65 in pattern III and 113.45 in pattern IV and mean TR PG was 27.57 in pattern I , 47.28 in pattern II, 64.32 in patternIII and 102.27 in pattern IV. Furthermore, Right ventricular outflow velocity time integral (VTI) , acceleration time (ACT) , pulmonary vascular resistance (PVR) showed significant correlation with the four right ventricular outflow Doppler patterns with p value ˂ 0.05.Conclusion : In this study, we show that easily appreciated differences in the shape or morphology of the right ventricular outflow tract Doppler signal provide rapid, powerful hemodynamic insight into the presence and severity of pulmonary hypertension . Keywords Echocardiography , Pulsed wave Doppler , Right ventricular outflow tract , Pulmonary hypertension
