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The intracarotid amobarbital procedure: when is it worth repeating?
Lindsay A Whitman1, Chris E Morrison, Tibor Becske
1Department of Neurology, New York University School of Medicine, New York, New York 10016, USA.
Epilepsia
|February 8, 2012
Summary
The intracarotid amobarbital procedure (IAP), or Wada test, shows high reliability for assessing language and memory lateralization in epilepsy patients. Repeat testing is beneficial for technical issues but less so for unexpected outcomes.
Area of Science:
- Neurology
- Neurosurgery
- Epileptology
Background:
- The intracarotid amobarbital procedure (IAP), or Wada test, is crucial for lateralizing brain function and assessing memory.
- Formal reliability testing of the IAP is challenging due to ethical and practical constraints.
- However, repeat IAPs are sometimes clinically necessary, offering an opportunity to evaluate test-retest reliability.
Purpose of the Study:
- To determine the frequency and reasons for repeat IAPs in a large epilepsy center.
- To assess the test-retest reliability of the IAP for language and memory lateralization.
Main Methods:
- A retrospective review of 630 IAPs performed between 2001 and 2011 at a tertiary epilepsy center.
- Analysis of 20 patients who underwent two or more IAPs on separate occasions.
- Patients were grouped based on reasons for repeat testing: technical complications versus other clinical indications.
Main Results:
- Language lateralization was consistent across repeat IAPs in nearly all cases.
- For patients with repeat IAPs due to non-technical reasons, consistency rates for memory outcomes were 79% (ipsilateral) and 73% (contralateral).
- Repeat IAPs were reliable even when technical issues recurred, with no significant difference between ipsilateral and contralateral injection outcomes.
Conclusions:
- The IAP demonstrates high test-retest reliability for both language and memory assessments.
- Repeat IAPs are valuable for patients experiencing correctable technical difficulties during the initial procedure.
- Repeating the IAP for discordant or unexpected results offers limited clinical benefit due to the procedure's inherent reliability.
