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Functional changes in the brainstem auditory pathways following open-heart surgery.

A Frenkel1, D Zikk, Y Rapoport

  • 1Department of Otorhinolaryngology, Tel Aviv Sourasky Medical Center, Israel.

ORL; Journal for Oto-Rhino-Laryngology and Its Related Specialties
|January 1, 1990
PubMed
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Auditory brainstem responses (ABR) assess brainstem function after heart surgery. Postoperative ABR changes in patients suggest neurological alterations, not hearing loss, highlighting ABR

Area of Science:

  • Neurology
  • Audiology
  • Cardiovascular Surgery

Background:

  • Open-heart surgery can impact neurological function.
  • Assessing brainstem auditory pathways is crucial post-surgery.
  • Auditory brainstem responses (ABR) offer a non-invasive method for evaluation.

Purpose of the Study:

  • To evaluate the functional integrity of brainstem auditory pathways after open-heart surgery using ABR.
  • To compare postoperative ABR findings with pre-operative data and a control group.

Main Methods:

  • Auditory brainstem responses (ABR) were recorded in 31 patients before and after open-heart surgery.
  • ABR measurements included wave I to wave V interpeak latency (I-V IPL).
  • Data were compared to a control group of normal-hearing subjects.

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Main Results:

  • Postoperative ABR abnormalities were detected in 12 out of 31 patients.
  • Changes in brainstem transmission time (I-V IPL) included prolongation (6 patients) and shortening (8 patients).
  • No concurrent hearing impairment was observed, suggesting neurological rather than auditory deficits.

Conclusions:

  • Postoperative changes in ABR, specifically I-V IPL, indicate potential functional alterations in the brainstem's neurological status.
  • These neurological changes occurred independently of hearing function.
  • ABR measurement is a valuable tool for assessing neurological status following open-heart surgery, warranting further investigation into the underlying mechanisms.