Deterioration in cardiac systolic and diastolic function late in normal human pregnancy.
The aim of the present study was to undertake a longitudinal study of systolic and diastolic cardiac function during normal pregnancy. At a median of 16 weeks of gestation, 100 primiparous women underwent echocardiography, including tissue Doppler imaging, determining left ventricular mass, cardiac output, systolic and diastolic velocities, and wall stress. A total of 32 were assessed again at a median of 37 weeks of gestation. Non-pregnant control estimates (n=9) were obtained by averaging four separate measures over two menstrual cycles. Initially, the pregnant women had significantly higher pulse rates than controls, associated with greater ventricular wall stress (two-tailed P value=0.015), and systolic (two-tailed P value=0.005) and diastolic (two-tailed P value=0.018) lateral wall myocardial velocities, but no differences in systolic blood pressure, left ventricular mass or cardiac output. By 37 weeks of gestation, increased blood pressure (two-tailed P value<0.001) and left ventricular mass (two-tailed P value=0.002) were associated with a significant increase in ventricular wall stress (two-tailed P value<0.001), and reductions in septal systolic (two-tailed P value=0.004) and septal and lateral early diastolic (two-tailed P value<0.001) myocardial velocities. The diastolic velocities at 37 weeks correlated inversely with maternal weight and age. In conclusion, by term pregnancy, an increase in ventricular wall stress is accompanied by a deterioration in cardiac function.
Zentner
Dominica
D
Department of Physiology, University of Melbourne, Parkville, VIC 3010, Australia. dominica.zentner@mh.org.au
du Plessis
Moira
M
Brennecke
Shaun
S
Wong
James
J
Grigg
Leeanne
L
Harrap
Stephen B
SB
D000328:Adult; D049628:Body Size / Q000502:physiology; D002302:Cardiac Output / Q000502:physiology; D003971:Diastole / Q000502:physiology*; D018618:Echocardiography, Doppler, Color / Q000379:methods; D005260:Female; D006439:Hemodynamics / Q000502:physiology; D006801:Humans; D008137:Longitudinal Studies; D008423:Maternal Age; D011247:Pregnancy / Q000502:physiology*; D011248:Pregnancy Complications / Q000503:physiopathology; D013599:Systole / Q000502:physiology*; D016216:Ultrasonography, Prenatal / Q000379:methods