J Clin Neurol.  2016 Apr;12(2):151-159. 10.3988/jcn.2016.12.2.151.

Changes in Central Auditory Processing in Patients with Mesial Temporal Lobe Epilepsy after Anterior Temporal Lobectomy with Amygdalohippocampectomy

• Han SH
• Lee EM
• Choi EJ
• Ryu HU
• Kang JK
• Chung JW

• KMID: 2354134
• DOI: http://doi.org/10.3988/jcn.2016.12.2.151

Abstract

BACKGROUND AND PURPOSE
This study aimed to determine the effects of anterior temporal lobectomy with amygdalohippocampectomy (ATL-AH) on central auditory processing (CAP) in patients with mesial temporal lobe epilepsy with hippocampal sclerosis (mTLE-HS), and to identify factors that may contribute to the postoperative worsening of CAP.
METHODS
Frequency-pattern, duration-pattern, and dichotic tests were performed before and after epilepsy surgery in 22 patients with normal hearing according to pure-tone audiometry.
RESULTS
No significant difference in CAP scores was detected between pre- and postoperative tests, but there was a strong association between surgery in the language-dominant temporal lobe and postoperative worsening in the non-dominant-side dichotic test (p<0.05). The probability of a decreased performance in a non-dominant-side dichotic test after surgery was 7.5-fold greater in patients who underwent surgery on the dominant temporal lobe compared with the nondominant temporal lobe. No significant association of postoperative worsening in CAP with the verbal, nonverbal intelligence quotient, or right- or left-side lobectomy was noted.
CONCLUSIONS
These results suggest that ATL-AH on the dominant side in patients with mTLE-HS worsens the CAP ability in the non-dominant-side dichotic test.

Keyword

central auditory processing disorder; auditory perceptual disorder; temporal lobe epilepsy; hippocampus; temporal lobectomy; amygdalohippocampectomy

MeSH Terms

Anterior Temporal Lobectomy*
Audiometry, Pure-Tone
Auditory Perceptual Disorders
Epilepsy
Epilepsy, Temporal Lobe*
Hearing
Hippocampus
Humans
Intelligence
Language Development Disorders
Sclerosis
Temporal Lobe*

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