PMID: 9170474Jun 1, 1997Paper

Changes in hemodynamics, ventricular remodeling, and ventricular contractility during normal pregnancy: a longitudinal study

Obstetrics and Gynecology
G J GilsonL B Curet

Abstract

To investigate the hemodynamic changes occurring in normal pregnancy and to see if these changes were associated with an increase in myocardial contractility. In a longitudinal study, primigravidas were studied with echocardiography in early (15 +/- 1.8 weeks), mid (26 +/- 1.2 weeks), and late (36 +/- 1.0 weeks) gestation, as well as at 6 weeks postpartum. Cardiac dimensions were measured with two-dimensional and M-mode echocardiography and hemodynamic indices were calculated. All measurements were made with subjects in the left lateral decubitus position. Statistical analysis was performed with repeated measures analysis of variance. Seventy-six women with normal pregnancy outcomes completed all four studies. From the baseline study to late gestation, an increase in cardiac output of 27% (from [mean +/- standard error] 4.2 +/- 0.1 to 5.8 +/- 0.2 L/min, P = .001), and a decrease in total peripheral resistance of 33% (from 1356 +/- 69 to 941 +/- 37 dynes/second cm-5, P = .001) occurred. Over this same time period, left ventricular function, while demonstrating a small and non-significant increase in velocity of circumferential fiber shortening (from 1.25 +/- 0.02 to 1.27 +/- 0.02 cm/second), revealed a 12% decrease in wall stres...Continue Reading

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