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Abnormal cingulate and prefrontal cortical neurochemistry in major depression after electroconvulsive therapy.

Abstract：

BACKGROUND:Metabolic changes after electroconvulsive therapy (ECT) have been described in depressed patients, but results are heterogeneous. To determine the concentrations of N-acetyl-aspartate (NAA), choline-containing compounds, creatine + phosphocreatine (tCr), and glutamate in the left dorsolateral prefrontal cortex (DLPFC) and left anterior cingulum of depressed patients before and after ECT, we used proton magnetic resonance spectroscopy. METHODS:Metabolite concentrations in the DLPFC and anterior cingulum were determined in 25 patients with major depressive disorder (MDD) and 27 healthy control subjects using the point resolved spectroscopy sequence. Neuropsychological and clinical parameters were determined before and after nine sessions of right unilateral ultrabrief pulse ECT. RESULTS:In the cingulum, baseline glutamate and NAA levels were decreased in depressed patients. High glutamate at baseline predicted a greater treatment response. After ECT, increased NAA levels were observed in responders to treatment and tCr levels were significantly decreased across all depressive patients. In the left DLPFC, NAA levels were significantly decreased in responders to ECT compared with nonresponders. Autobiographic memory was deteriorated in all patients after ECT. CONCLUSIONS:Low glutamatergic state in depressive patients emphasizes the role of dysfunctional glutamatergic neurotransmission in the pathophysiology of MDD. The low NAA level at baseline in the patients supports neurodegenerative changes in MDD. N-acetyl-aspartate levels might serve as early surrogate marker for dynamic metabolic changes due to ECT, reflecting both neuroprotection and lowered neuronal viability. The tCr decrease in the cingulum suggests altered mitochondrial energy metabolism.

journal_name

Biol Psychiatry

journal_title

Biological psychiatry

authors

Merkl A,Schubert F,Quante A,Luborzewski A,Brakemeier EL,Grimm S,Heuser I,Bajbouj M

doi

10.1016/j.biopsych.2010.08.009

subject

Has Abstract

pub_date

2011-04-15 00:00:00

pages

772-9

issue

8

eissn

0006-3223

issn

1873-2402

pii

S0006-3223(10)00843-7

journal_volume

69

pub_type

杂志文章

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