ISSN : 1301-5680
e-ISSN : 2149-8156
Turkish Journal of Thoracic and Cardiovascular Surgery     
Cardiopulmonary bypass circulation does not have adverse effects on ear functions: a study of otoacoustic emissions
Erkan İriz1, Metin Yılmaz2, Bülent Gündüz3, Ayşe İriz4, Emrah Ereren1, Yıldırım Ahmet Bayazit2, Ali Yener1
1Departments of Cardiovascular Surgery, Medicine Faculty of Gazi University, Ankara
2Departments of Otolaryngology, Medicine Faculty of Gazi University, Ankara
3Departments of Audiology, Medicine Faculty of Gazi University, Ankara
4Department of Otolaryngology, Ankara Numune Training and Research Hospital, Ankara
Background: This study was performed to investigate the effects of coronary artery bypass grafting with cardiopulmonary bypass circulation on hearing and inner ear status.

Methods: The study included 42 ears of 21 patients (11 males, 10 females; mean age 61 years; range 44 to 76 years) who underwent coronary artery bypass grafting. None of the patients had a history of cerebrovascular disease such as ischemic cerebrovascular event, syncope, or hearing loss. The number of arteries bypassed ranged from 1 to 4 (mean 2.7). The patients were examined with pure tone audiometry, speech discrimination test, and tympanometry, and transiently evoked (TEOAE) and distortion product (DPOAE) otoacoustic emissions were recorded preoperatively and on the postoperative sixth day. The pure tones were obtained at the frequencies of 250, 500, 1,000, 2,000, 4,000, and 6,000 Hz.

Results: None of the patients had hearing loss or sudden deafness after surgery. Preoperative and postoperative pure tone results of the patients did not differ significantly (p>0.05). The mean pre- and postoperative speech discrimination scores were 88±14% and 91±1%, respectively (p<0.05). Pre- and postoperative DPOAE findings did not differ significantly (p>0.05). Audiometric results showed no correlations with the number of bypassed arteries and operative variables (p>0.05).

Conclusion: Our findings suggest that coronary artery bypass grafting with extracorporeal circulation does not impose a risk for hearing loss and for the functions of outer hair cells in the inner ear.

Keywords : Audiometry, pure-tone; cardiopulmonary bypass/ adverse effects; hearing loss, sensorineural/etiology; otoacoustic emissions, spontaneous; postoperative complications
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