STUDY ON PULMONARY VASCULAR RESISTANCE BY ECHOCARDIOGRAPHY IN PATIENTS WITH MITRAL STENOSIS

Abstract

Objective: assessing changes in pulmonary vascular resistance by Doppler ultrasound in patients with mitral stenosis who had pulmonary hypertension and evaluating the relationship between pulmonary vascular resistance with the degree of heart failure (NYHA), mitral valve area and systolic pulmonary pressure. Methods: 56 patients with mitral stenosis were admitted to the Department of Cardiology, Hue Central Hospital. The Doppler ultrasound was maded in all patients. Results: The proportion of patients with pulmonary vascular resistance ≥ 2 Wood UI is 83,90%. Pulmonary vascular resistance in group with mild mitral stenosis was 2.55 ± 0.97 (Wood), in group with moderate mitral stenosis was 2.71 ± 1.27 (Wood) and in group with severe mitral stenosis was 3.70 ± 1, 24 (Wood). Pulmonary vascular resistance in the group with mild pulmonary hypertension was 2.80 ± 0.84 (Wood), moderate pulmonary hypertension was 2.96 ± 0.40 (Wood) and severe pulmonary hypertension was 4.73 ± 1.40 (Wood). There is a positive correlation between pulmonary vascular resistance with heart failure according to the NYHA classification (r=0.58 p<0.0001), systolic pulmonary artery pressure (r = 0.79 and p <0, 0001). There was a negative correlation between pulmonary vascular resistance with mitral valve area (r = -0.57 p <0.0001). Conclusions: We found a good correlation between the pulmonary vascular resistance by Echo –Doppler and the severity of mitral stenosis, systolic pulmonary pressure, NYHA classification. Keywords: Pulmonary vascular resistance; mitral stenosis.