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To compare maternal cardiovascular indices at 19–23 weeks' gestation between twin and singleton pregnancies and assess the impact of chorionicity on these parameters.The study population of 155 women with twin pregnancy included 86 dichorionic and 69 monochorionic cases. In both types of twin pregnancy, compared with singleton pregnancy, there was an increase in isovolumetric relaxation time, left atrial area and myocardial performance index, and a decrease in mitral valve E/A. Left ventricular mass indexed for body surface area and relative wall thickness were also increased in twin compared with singleton pregnancy. The magnitude of the increase in left atrial area was greater in dichorionic compared with monochorionic pregnancies. In twin pregnancies at mid‐gestation, maternal systolic and diastolic function is reduced when compared with singletons. The patterns of cardiovascular adaptation are similar between monochorionic and dichorionic pregnancies and resemble those reported in uncomplicated singleton pregnancy later in gestation.
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