Introduction
Pregnancy causes several physiological changes as well as changes in cardiovascular system. These changes are usually seen during pregnancy and mostly resolve after delivery. Plasma volume, heart rate and stroke volume increase in pregnancy and because of these changes cardiac output increases (1). The change in stroke volume occurs by means of increase in ventricular muscle mass and cardiac chamber dilation seen in all four cardiac chambers. The effect of stroke volume on cardiac output is more evident in early course of pregnancy and later in the course it is mainly associated with increased heart rate. Besides these changes, left ventricular (LV) ejection fraction and right ventricular (RV) systolic function do not change in pregnancy (2-3). RV has a key role in cardiovascular physiology and shows compensatory changes including RV dilation and hypertrophy in pregnancy (4). Although there are many studies demonstrated the effects of pregnancy on cardiovascular system; the long-term effect of pregnancy on right heart functions has not been studied. We thought that some changes can persist after delivery in some extent and there may be an additive effect of each pregnancy on these changes. Therefore, we have evaluated the long-term effect of pregnancy on RV dilation and RV hypertrophy and their relation of the number of parity.