BACKGROUND: While up to a third of patients may experience a decline in memory following an anterior temporal lobe resection (ATL) for epilepsy, between 10 and 20% may experience a postoperative improvement in function. The aim of this study was to examine the preoperative characteristics of these patients. METHODS: Logistic regression analyses were used to determine which variables influenced postoperative memory improvement following ATL on standardized memory tests in 237 patients with unilateral hippocampal sclerosis (105 right; 132 left). RESULTS: A total of 22% of the right ATL and 9% of the left ATL group demonstrated a significant postoperative improvement in verbal learning. A total of 9% of the right ATL and 16% of the left ATL group demonstrated a significant postoperative improvement in visual learning. In the R ATL group, postoperative improvements in verbal learning were associated with poor preoperative verbal learning, a shorter duration of epilepsy, higher scores on the visual learning task, and an older age at the time of surgery. In the L ATL group, postoperative improvements in visual learning were associated with poor preoperative visual learning, a shorter duration of epilepsy, and a higher IQ. Postoperative improvements in memory functions associated with the ipsilateral temporal lobe were not associated with demographic or epilepsy-related variables. CONCLUSIONS: Memory deficits normally associated with the function of the contralateral temporal lobe in patients with unilateral hippocampal sclerosis may improve postoperatively in patients with a shorter duration of epilepsy and the cognitive capacity to develop compensatory strategies.
BACKGROUND: While up to a third of patients may experience a decline in memory following an anterior temporal lobe resection (ATL) for epilepsy, between 10 and 20% may experience a postoperative improvement in function. The aim of this study was to examine the preoperative characteristics of these patients. METHODS: Logistic regression analyses were used to determine which variables influenced postoperative memory improvement following ATL on standardized memory tests in 237 patients with unilateral hippocampal sclerosis (105 right; 132 left). RESULTS: A total of 22% of the right ATL and 9% of the left ATL group demonstrated a significant postoperative improvement in verbal learning. A total of 9% of the right ATL and 16% of the left ATL group demonstrated a significant postoperative improvement in visual learning. In the R ATL group, postoperative improvements in verbal learning were associated with poor preoperative verbal learning, a shorter duration of epilepsy, higher scores on the visual learning task, and an older age at the time of surgery. In the L ATL group, postoperative improvements in visual learning were associated with poor preoperative visual learning, a shorter duration of epilepsy, and a higher IQ. Postoperative improvements in memory functions associated with the ipsilateral temporal lobe were not associated with demographic or epilepsy-related variables. CONCLUSIONS:Memory deficits normally associated with the function of the contralateral temporal lobe in patients with unilateral hippocampal sclerosis may improve postoperatively in patients with a shorter duration of epilepsy and the cognitive capacity to develop compensatory strategies.
Authors: Silvia B Bonelli; Robert H W Powell; Mahinda Yogarajah; Rebecca S Samson; Mark R Symms; Pamela J Thompson; Matthias J Koepp; John S Duncan Journal: Brain Date: 2010-02-15 Impact factor: 13.501
Authors: Aaron F Struck; Melanie Boly; Gyujoon Hwang; Veena Nair; Jedidiah Mathis; Andrew Nencka; Lisa L Conant; Edgar A DeYoe; Manoj Raghavan; Vivek Prabhakaran; Jeffrey R Binder; Mary E Meyerand; Bruce P Hermann Journal: Epilepsy Behav Date: 2021-02-18 Impact factor: 2.937
Authors: Britta Wandschneider; Maria Centeno; Christian Vollmar; Mark Symms; Pamela J Thompson; John S Duncan; Matthias J Koepp Journal: Brain Date: 2014-07-07 Impact factor: 13.501