Effects of vasodilators on pulmonary venous and mitral flow velocity patterns in patients with congestive heart failure.

Abstract

To characterize abnormalities in pulmonary venous flow velocity patterns and to explore the changes in these patterns following short-term (3 to 14 days) administration of vasodilators, pulmonary venous and mitral flow velocity patterns were serially studied at congestive heart failure and after vasodilator administration in 18 patients. Peak mitral early diastolic filling velocity (E) and the ratio of E to peak filling velocity at atrial contraction (E/A) consistently decreased after vasodilator administration by 30 +/- 4 cm/s and 0.74 +/- 0.13 (mean +/- SD), respectively. Peak pulmonary venous diastolic forward flow velocity also decreased by 29 +/- 4 cm/s. However, changes in peak pulmonary venous systolic forward flow velocity (S, cm/s) did not correlate with changes in E, the E/A ratio, or D (peak pulmonary venous diastolic forward flow velocity). Thus, when patients were divided into two groups on the basis of changes in S, indices of left ventricular systolic performance, such as end-systolic dimension and fractional shortening, improved more in the group which showed an increase in S after vasodilator administration than in the group which showed a decrease in S (-7 +/- 6 vs -1 +/- 4 mm, p < 0.05; 8 +/- 6 vs -1 +/- 4%, p < 0.05). Although the mitral flow velocity pattern changed uniformly with vasodilator administration in patients with mild to moderate congestive heart failure, the changes in pulmonary venous flow velocity patterns were not uniform among patients. Pulmonary venous flow velocity patterns appear to reflect changes in left ventricular systolic performance in addition to those in left ventricular diastolic performance.