Assessment of pulmonary vascular resistance via doppler echocardiography in ischemic heart disease with reduced ejection fraction

To determine pulmonary vascular resistance (PVR) by echocardiography - Doppler; and evaluate the correlation between pulmonary vascular resistance and some variables such as left ventricular EF, PASP, TAPSE, and tissue S-wave of the tricuspid valve in patients with ischemic heart disease.