Nghiên cứu biến đổi theo hô hấp dòng chảy qua van hai lá và van ba lá ở bệnh nhân tràn dịch màng ngoài tim có ép tim

Obiective: To evaluate the respiratory variations of mitral and tricuspid in flow in patients with cardiac tamponade. Methods: Respiratory hemodynamic changes in mitral and tricuspid inflows were evaluated using Doppler echocardiography in 17 patients with medium or large pericardial effusion with clinical cardiac tamponade, compared with those of 24 patients with medium or large pericardial effusion without cardiac tamponade (control). Results: Peak velocity of early diastolic mitral inflow (E velocity) decreased during ins(!iration com,!arJd with expiratory increase; the mean percentage change was 37.76 + or - 18.58 percent: Peak velocity of late diastolic mitral inflow (A velocity) decreased 11.43 + or - 9.56 percent during inspiration. But respiratory variations of tricuspid inflow were opposite to those of mitral inflow. Tricuspid E velocity increased during inspiration and decre-ased during expiration. The mean percentage change was 100.86 + or -.58.5 percent. Conclusion: Patients with cardiac tamponade showed inspiratory increases of diastolic tricuspid .filling flow. Expiratory increases diastolic mitral filling flow.