The Impact of Maternal Sound on Awareness for Pediatric Patients Undergoing Cardiac Surgery

children (4 to 8 years) undergoing repair of Atrial Septal Defect (ASD). Patients will be randomized into two groups (music group and maternal sound group); in music group patients listened to a recorded CD by music and songs preferred by the child, while in maternal sound group patients listened to a recorded CD where the mother singing the most popular songs their children like or telling a story to their children. In both groups bi spectral index (BIS) to detect depth of anesthesia. An interview will be conducted with the patients and their parent within the first postoperative week by a semi-structured in-depth questionnaire to evaluate occurrence of awareness.