Baseline pre-CPB TEE evaluation of LVOT diameter and LVOT area in ME-AV long axis view (average of three readings) will be recorded and used as a standard for subsequent calculation of cardiac output and cardiac index post-CPB and in ICU. Intra-operative TEE will be used to calculate the LVOT VTI (mean of three values) either in the transgastric long axis view or the deep transgastric long axis view (which ever gives better alignment) 15 minutes after separation from CPB and before transfer to ICU with simultaneous recording of systemic pressures (SBP,DBP and MAP). Vasoplegia in our study will be defined by mean arterial blood pressure < 60 mmHg with cardiac index ≥ 2.2 l/min/m2 or requirement for vasopressors to maintain MAP > 60 mmHg in presence of cardiac index ≥ 2.2 l/min/m2 65.