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Audiometric changes in patients undergoing coronary artery bypass surgery
1ENT Department, Royal South Hants Hospital, Southampton, UK.
British Journal of Audiology
|February 1, 1996
Summary
Coronary artery bypass surgery can cause hearing loss. This study found statistically significant hearing threshold shifts in bypass patients compared to controls, linked to age and operative factors.
Area of Science:
- Cardiology
- Audiology
- Neurosurgery
Background:
- Severe hearing loss after coronary artery bypass surgery (CABS) is rare (1 in 1000).
- Subtle audiological changes post-CABS require evaluation.
- Identifying factors contributing to auditory insult is crucial.
Purpose of the Study:
- To assess audiological changes after CABS.
- To detect non-severe hearing losses.
- To identify factors associated with auditory impairment post-CABS.
Main Methods:
- Pre- and post-operative audiograms were performed on CABS patients.
- A control group underwent thoracotomy without cardiopulmonary bypass.
- Patients receiving sedatives, ototoxic drugs, or opiate analgesia were excluded.
Main Results:
- Five ears (four individuals) in the CABS group showed statistically significant high-frequency hearing loss.
- CABS patients exhibited worse hearing threshold shifts than the control group.
- Age, minimum intraoperative temperature, minimum blood pressure, and bypass time predicted hearing impairment.
Conclusions:
- Coronary artery bypass surgery is associated with statistically significant auditory threshold shifts.
- Patient age and specific intraoperative parameters influence the risk of hearing impairment.
- Further research into mitigating auditory risks during CABS is warranted.