Ionotropes will be used according to the underlying cardiac pathology. A combination of milrinone and norepinephrine will be used in patients with right ventricular dysfunction and pulmonary arterial hypertension ; a combination of dobutamine and norepinephrine/epinephrine will be used in patients with LV dysfunction ; in patients with biventricular dysfunction milrinone and norepinephrine/epinephrine will be used and low dose norepinephrine will be used in patients with diastolic dysfunction. Total dose of vasoactive drugs used in the postoperative period in the both the groups will be recorded in first 48 hours and analysed. In the ICU, following parameters will be recorded: