M-Mode echocardiography of a healthy pregnant patient, in parasternal long-axis view showing left ventricular fractional shortening and ejection fraction–IVSd (interventricular septum thickness at diastole, LVIDd (left ventricle internal diameter during diastole), LVIDs (left ventricular internal diameter during systole, LVPWd (left ventricular posterior wall thickness during diastole, EDV (end diastole volume), ESV (end systole volume), EF (ejection fraction), FS (fractional shortening). Courtesy of Elias Cardiology Department.