To exclude hypovolemia before starting off pump coronary artery grafting surgeries by an efficient and good predictive test. We will assess the sensitivity and specificity of dynamic IVC-derived parameters (dispensability index) in comparison to carotid Doppler peak velocity as predictors of fluid response before skin incision in patients undergoing off Pump cardiac surgery.
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cardiac output by transthoracic echocardiography
Timeframe: immediately before fluid administration
cardiac outputby transthoracic echocardiography
Timeframe: immediately after fluid administration