الفهرس 
Material and methodsOnly 14 pages are availabe for public view
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Abstract
Tricuspid regurgitation is present in 90 - 95% of patients with
pulmonary hypertension, Doppler echocardiography exhibit high
sensitivity and high specificity as a non - invasive assessment of
tricuspid regurgitation. By applying the modifie Bernoulli equation,
we can estimate the right ventricular systolic pressure.
Clinically; estimation of right atrial pressure is not necessary to
achive accurate results in patients without right ventricular outflow
tract obstruction, the estimated right ventricular systolic pressure also
predicts the pulmonary artery systolic pressure on the basis of
Doppler catheters correlative study in a large number of patients. we
suggest that continuos wave Doppler echocardiography is an accurate
non - invasive technique for the estimation of pulmonary artery
systolic pressure in patients with wide spectrum of cardiac lesions.
In the absence of Tricuspid regurgitation jet, by Doppler
as In cases of sever pulmonary hypertention. There is another
non - invasive methods to predict the PASP by pulmonary flow
acceleration time recorded by pulsed Doppler .Although, The
pulmonary flow acceleration time is valueless to evaluate PASP
(Okamoto et al., 1984).
M-Mode echocardiography as a possible non- invasive alternative
methods, was studied by in 20 patients with pulmonary hypertention.
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________________________ CpftCfusion
The interval from the Q wave ofthe electrocardiogram (BCG) to the
mitral valve closure on mitral valve .M-mode echo cardiogram (QMVC)
the interval between the aortic valve closure and mitral valve E
point (AVC - E ) on aortic and mitral valve. M-mode ECG
respectively and the ratio of there intervals (Q-MVC / AVC-E) was
correlated to the mean PASP measured at catheterization (r = 0.89, P
< 0.001) (Sharma et al., 1994) .