ABSTRACT
Coronary artery bypass graft is one of the most common surgeries in hospitals. Almost 50% of patients have complications. One of these complications is hearing loss. Coronary artery bypasses grafting patients having inclusion criteria participated. One day before surgery, One day after surgery and if patients had hearing loss, the nest week otoacoustic emission test was done. Patients were divided in to two groups: on pump and off pump bypass surgeries. Hearing loss occurred in 12%. Hearing loss in on-pump patients was 14.3% and in off-pump was 6/7% [p=0.09]. The relation of preoperative OAE test and final OAE was tested and it was significant [p<0.005]. In male patients, hearing loss in on-pump operation was 18/6% [p=0.002] and in females in on-pump operation was 7/4% and in off-pump operation was 18.2% [p=0.1]. Hearing loss occurred in 4/2% in 1500, 2000 HZ; 12./5% in 2500, 3000 HZ and 83/3% in 3500, 4000 HZ. It after coronary artery bypass graft is rather Frequents [12%] and is more common in on-pump surgery, and occurs in high frequency, hearing loss is more common in male patients