Abstract:
OBJECTIVE:This study prospectively examined the relationships among late night salivary cortisol (NSC) levels and depressive symptoms, memory performance, and hippocampal volumes in patients with medically intractable temporal lobe epilepsy (TLE) and the potential mediating effects of cortisol in the relationships between these variables. METHODS:Participants included 24 adults with well-characterized medically refractory TLE (right = 11; left = 12; bitemporal = 1). All patients provided saliva samples and completed measures of mood, anxiety, and memory (objective and subjective). MRI-based volumetric analyses of the hippocampi were also conducted. RESULTS:As hypothesized, cortisol was found to be negatively related to several memory measures such that patients with higher cortisol levels demonstrated lower memory performance. However, unexpectedly, cortisol was not related to current symptoms of depression or anxiety, subjective memory ratings, or hippocampal volumes. Consistent with previous findings in the literature, a number of other relationships among the study variables were observed (objective memory and hippocampal volume; subjective memory and mood/anxiety). Results of mediator analyses suggested that cortisol does not mediate the relationship between depression and memory dysfunction or the relationship between depression and hippocampal atrophy. CONCLUSIONS:While cortisol may play a role in memory performance in patients with TLE, it does not fully explain the relationship between depression and mesial temporal dysfunction, likely reflecting the complex and multifactorial relationships among these variables. Results confirm the relationship between memory performance and structural brain integrity and provide further support for a role of depression in subjective memory complaints.
journal_name
Neurologyjournal_title
Neurologyauthors
Busch RM,Frazier T,Chapin JS,Hamrahian AH,Diehl B,Alexopoulos A,Unnwongse K,Naugle RI,Kubu CS,Tesar GE,Najm IMdoi
10.1212/WNL.0b013e31824e8efbsubject
Has Abstractpub_date
2012-04-03 00:00:00pages
1064-8issue
14eissn
0028-3878issn
1526-632Xpii
WNL.0b013e31824e8efbjournal_volume
78pub_type
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