Cingulum bundle white matter lesions influence antidepressant response in late-life depression: a pilot study.
BACKGROUND
Late-life depression is associated with white matter hyperintense lesions (WMLs) occurring in specific fiber tracts. In this study, we sought to determine if greater WML severity in the cingulum bundle or uncinate fasciculus was associated with poor short-term antidepressant response.


METHODS
Eleven depressed elders completed a baseline cranial 3T MRI and received antidepressant treatment following a medication algorithm. MRIs were analyzed to measure the fraction of each fiber tract׳s volume occupied by WMLs. Statistical analyses examined the effect of dichotomized fiber tract WML severity on three- and six-month depression severity after controlling for age and baseline depression severity.


RESULTS
Greater WML severity in the left hemispheric cingulum bundle adjacent to the hippocampus was associated with greater post-treatment depression severity at three- (F1,7=6.42, p=0.0390) and six-month assessments (F1,5=9.62, p=0.0268). Other fiber tract WML measures were not significantly associated with outcomes.


CONCLUSIONS
The study had a small sample size and analyses were limited to only a priori fiber tracts.


CONCLUSIONS
This pilot study supports the hypothesis that focal damage to the cingulum bundle may contribute to poor short-term antidepressant response. These findings warrant further investigation with a larger, more definitive study.
The Center for Cognitive Medicine, Department of Psychiatry, Vanderbilt University Medical Center, 1601 23rd Avenue South, Nashville, TN 37212, USA. Electronic address: warren.d.taylor@vanderbilt.edu.
Warren D
WD
Taylor
The Center for Cognitive Medicine, Department of Psychiatry, Vanderbilt University Medical Center, 1601 23rd Avenue South, Nashville, TN 37212, USA.
Kamil
K
Kudra
The Neuropsychiatric Imaging Research Laboratory, Department of Radiology, Duke University Medical Center, Durham, NC 27710, USA.
Zheen
Z
Zhao
Department of Psychiatry, University of Connecticut Health Center, Farmington, CT 06030, USA.
David C
DC
Steffens
The Neuropsychiatric Imaging Research Laboratory, Department of Radiology, Duke University Medical Center, Durham, NC 27710, USA.
James R
JR
MacFall
D000368:Aged; D000465:Algorithms; D000928:Antidepressive Agents / Q000627:therapeutic use*; D003865:Major Depressive Disorder / Q000188:drug therapy* / Q000473:pathology*; D005260:Female; D006179:Gyrus Cinguli / Q000473:pathology*; D006801:Humans; D008279:Magnetic Resonance Imaging; D008297:Male; D008875:Middle Aged; D010865:Pilot Projects; D012720:Severity of Illness Index
D000928:Antidepressive Agents
Depression; Geriatrics; Hyperintense lesions; MRI; Treatment response; Vascular disease