Using phonocardiogram to investigate maternal cardiac reserve function in gestational hypertension and preeclampsia
【摘要】：正Objective This study investigated,using phonocardiography,maternal cardiac reserve function with gestational hypertension and preeclampsia. Methods 99 pregnant women with gestational hypertension(50 cases) preeclampsia(49 cases) were included in the study.99 normotensive pregnant women were acted as controls.Using phonocardiography,cardiac reserve function parameters:the heart rate(HR),the ratio of the first heart sound magnitude to second heart sound magnitude(S1/S2) and the ratio of the diastolic duration to systolic duration(D/S) of all participants were recorded. Results The average S1/S2 of the preeclampsia group and gestational hypertension group were 4.3±2.2 and 2.2±1.1 respectively.The average D/S of the preeclampsia group and gestational hypertension group were 1.1±0.3 and 1.4±0.3 respectively.Cases of post-natal adverse maternal outcomes were only observed in the preeclampsia group.A small but significant proportion(2 of 28) suffered cardiac-related complications with 1 of these 2 patients dying from cardiac failure.Both these cases had notably poor cardiac reserve function(S1/S2 5.00 and D/S 1) before birth.Sl/S2 increases and D/S decreases with increasing severity of hypertension-complicated pregnancies. Conclusion These findings indicate that cardiac reserve declines with increasing severity of hypertension during pregnancy.Phonocardiography is a useful,convenient and clinically worthwhile technique in monitoring cardiac reserve function parameters of pregnant women with preeclampsia.