HAEMODYNAMICS OF HYPERTENSION IN PREGNANCY ASSESSED BY M‐MODE ECHOCARDIOGRAPHY

SUMMARY 1. Echocardiographic haemodynamic and left ventricular parameters were determined in twenty-one normotensives and thirty-six hypertensives during the last trimester of pregnancy. 2. Equivalent blood pressure control was obtained in hypertensives with bed rest only, oxprenolol or methyldopa, but remained above normotensive levels. 3. Cardiac output was elevated in the last trimester of pregnancy in normotensives and hypertensives. 4. Left ventricular mass was increased in normal pregnancy, but displayed an exaggerated increase in hypertensives. 5. Total peripheral resistance was inappropriately elevated in hypertensive pregnancy, but was normalized in the oxprenolol-treated group. 6. There was no reduction in heart rate or cardiac output in the β-adrenoreceptor blocker-treated group. This feature, in combination with lowered peripheral resistance, may contribute to the improvement in foetal outcome observed in maternal hypertension of pregnancy treated with oxprenolol.