 After completion of the cardioplegic arrest and for 10 minutes after termination of the CPB, all the patients will be monitored by TEE for air in the left heart. The residual air showing on TEE after the termination of CPB will be quantified in 4 grades depending upon presence of air in LA, LV and aortic root during one cardiac cycle grade 0 no or occasional air in LA, grade 1 air showing in LA only, grade 2 air showing simultaneously in LA and LV, grade 3 air showing simultaneously in LA, LV and the aortic root. The 10-minute post CPB TEE recording will be saved on a video-tape. 