HOME HELP FEEDBACK SUBSCRIPTIONS ARCHIVE SEARCH TABLE OF CONTENTS		QUICK SEARCH:   [advanced] Author: Keyword(s): Year:  Vol:  Page:

This Article Full Text Full Text (PDF) Correspondence: Submit a response Alert me when this article is cited Alert me when Correspondence are posted Alert me if a correction is posted Citation Map Services Email this article to a friend Similar articles in this journal Similar articles in PubMed Alert me to new issues of the journal Download to citation manager Citing Articles Citing Articles via HighWire Citing Articles via Google Scholar Google Scholar Articles by Alpherts, W.C.J. Search for Related Content PubMed PubMed Citation Articles by Alpherts, W.C.J. Related Collections Prognosis Memory All Epilepsy/Seizures Epilepsy surgery

Verbal memory decline after temporal epilepsy surgery?

A 6-year multiple assessments follow-up study

From the Department of Psychology (W.C.J.A., J.V.), Epilepsy Institute of the Netherlands, SEIN, Heemstede, The Netherlands; Department of Functional Neurosurgery (P.C.v.R.), University Hospital of Utrecht, Utrecht, The Netherlands; Institute of Neurobiology (F.H.L.d.S.), University of Amsterdam, Amsterdam, The Netherlands; and Rudolf Magnus Institute for Neurosciences (C.W.M.v.V.), University of Utrecht, Utrecht, The Netherlands.

Address correspondence and reprint requests to Dr. Willem C.J. Alpherts, Department of Psychology, Epilepsy Institute of the Netherlands, SEIN, Achterweg 5, 2103 SW Heemstede, The Netherlands; e-mail: walpherts{at}sein.nl

Objective: To assess the long-term effects of temporal lobe epilepsy surgery on verbal memory.

Methods: We assessed verbal memory performance as measured by a verbal learning test ("15 Words Test," a Dutch adaptation of Rey's Auditory Verbal Learning Test) before surgery and at three specific times after surgery: 6 months, 2 years, and 6 years in 85 patients (34 left temporal lobe [LTL] vs. 51 right temporal lobe [RTL]). An amygdalo-hippocampectomy and a neocortical temporal resection between 2.5 and 8 cm were carried out in all patients.

Results: LTL patients showed an ongoing memory decline for consolidation and acquisition of verbal material (both 2/3 SDs) for up to 2 years after surgery. RTL patients at first showed a gain in both memory acquisition and consolidation, which vanished in the long term. Breaking the group up into a mesiotemporal (MTS) group and a non-MTS group showed clear differences. The group with pure MTS showed an overall lower verbal memory performance than the group without pure MTS, in the LTL group more pronounced than in the RTL group. After surgery, both pathology groups showed an ongoing decline for up to 2 years, but the degree of decline was greater for the LTL patients with MTS compared with the non-MTS group. Becoming and remaining seizure-free after surgery does not result in a better performance in the long term. Predictors of postoperative verbal memory performance at 6 years after surgery were side of surgery, preoperative memory score, and age.

Conclusions: The results provide evidence for a dynamic decline of verbal memory functions up to 2 years after left temporal lobectomy, which then levels off.

Disclosure: The authors report no conflicts of interest.

Received July 8, 2004. Accepted in final form April 20, 2006.

This article has been cited by other articles:

				S. Baxendale, P. J. Thompson, and J. S. Duncan Improvements in memory function following anterior temporal lobe resection for epilepsy Neurology, October 21, 2008; 71(17): 1319 - 1325. [Abstract] [Full Text] [PDF]

				J. T. Langfitt, M. Westerveld, M. J. Hamberger, T. S. Walczak, D. V. Cicchetti, A. T. Berg, B. G. Vickrey, W. B. Barr, M. R. Sperling, D. Masur, et al. Worsening of quality of life after epilepsy surgery: Effect of seizures and memory decline Neurology, June 5, 2007; 68(23): 1988 - 1994. [Abstract] [Full Text] [PDF]