[Evaluation of pulmonary arterial pressure by pulsed Doppler echocardiography compared with cardiac catheterization].

Twenty-six patients undergoing right cardiac catheterization were examined by pulsed doppler echocardiography (PDE), spectrum analysis of the shape of flow velocity curve of the pulmonary arteria during systole was made. Pulmonary arterial pressure (PAP) was qualitatively and qualitatively evaluated by right ventricular systolic time interval (RSTI) derived from pulmonary doppler blood flow velocity pattern. The correlation between PAP and the values of RSTI was evaluated, multiple stepwise regression analysis was performed. The pulmonary flow pattern and the values of RSTI measured from right ventricular outflow tract (RVOT) and main pulmonary artery (MPA) were compared. The results showed that: 1. Qualitative evaluation of PAP: (1) the triangular configuration of the pulmonary flow pattern was the feature of the pulmonary ejection flow in pulmonary hypertension (PH). (2) AT < 100ms AT/ET < 0.30 and PEP/AT > 1.1 indicated PH (PAMP > or = 2.7 kPa, AT < 100 ms, sensitivity 92.3%, specificity 100%). 2. Quantitative evaluation of PAP: (1) simple regression analysis: AT, AT/PEP especially AT showed a good inverse correlation with PAP, which was improved when a logarithmic function was applied, but not improved by the square root of heart rate. The liner regression equation and the correlation coefficient were: log PASP = -6.3617 AT +2.825 (r = -0.7925, P < 0.001); log PADP = -0.4569 AT +74.182 (r = -0.8513, P < 0.001); log PAMP = -0.0073 AT +2.198 (r = -0.8635, P < 0.001). (2) multiple stepwise regression analysis: the stepwise analysis of six parameters (PEP, ET, AT, AT/ET, AT/PEP, square root of R-R) showed that AT, PEP were the best parameters correlated with PAP.(ABSTRACT TRUNCATED AT 250 WORDS)