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Early brain-stem auditory evoked responses in vertebrobasilar transient ischemic attacks
Archives of Neurology
|May 1, 1987
Summary
Brain-stem auditory evoked response (BAER) studies reveal transient changes after vertebrobasilar transient ischemic attacks (VB TIA). Sequential BAER monitoring can help distinguish VB TIA from other brain-stem conditions.
Area of Science:
- Neurology
- Neurophysiology
Background:
- Vertebrobasilar transient ischemic attacks (VB TIA) can present with subtle or non-specific symptoms.
- Accurate differentiation of VB TIA from other brain-stem pathologies is clinically important.
Purpose of the Study:
- To investigate the utility of sequential Brain-stem Auditory Evoked Response (BAER) studies in patients following a VB TIA.
- To assess the temporal changes in BAER following VB TIA and their diagnostic value.
Main Methods:
- BAER studies were conducted in eight patients within 16 days of a VB TIA.
- Six patients underwent repeat BAER testing two to 16 days after the initial study.
- Analysis focused on waveform presence, interpeak latencies, and amplitude.
Main Results:
- Initially, all patients exhibited absent waveforms, prolonged latencies, or reduced amplitudes.
- Five of six patients showed normalization of BAER changes within 6 to 24 days post-TIA.
- One patient demonstrated near-normal BAER findings.
Conclusions:
- Sequential BAER studies demonstrate reversible changes following VB TIA.
- These findings differ from previous reports and suggest BAER's potential role in differentiating VB TIA from brain-stem infarction or mimic syndromes.