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Amygdala and regional volumes in treatment‐resistant versus nontreatment‐resistant depression patients
Author(s) -
Sandu AncaLarisa,
Artiges Eric,
Galinowski André,
Gallarda Thierry,
Bellivier Frank,
Lemaitre Hervé,
Granger Bernard,
Ringuenet Damien,
Tzavara Eleni T.,
Martinot JeanLuc,
Paillère Martinot MarieLaure
Publication year - 2017
Publication title -
depression and anxiety
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 2.634
H-Index - 129
eISSN - 1520-6394
pISSN - 1091-4269
DOI - 10.1002/da.22675
Subject(s) - treatment resistant depression , amygdala , depression (economics) , psychology , medicine , bipolar disorder , magnetic resonance imaging , voxel , mania , psychiatry , major depressive disorder , lithium (medication) , radiology , economics , macroeconomics
Background Although treatment‐resistant and nontreatment‐resistant depressed patients show structural brain anomalies relative to healthy controls, the difference in regional volumetry between these two groups remains undocumented. Methods A whole‐brain voxel‐based morphometry (VBM) analysis of regional volumes was performed in 125 participants’ magnetic resonance images obtained on a 1.5 Tesla scanner; 41 had treatment‐resistant depression (TRD), 40 nontreatment‐resistant depression (non‐TRD), and 44 were healthy controls. The groups were comparable for age and gender. Bipolar/unipolar features as well as pharmacological treatment classes were taken into account as covariates. Results TRD patients had higher gray matter (GM) volume in the left and right amygdala than non‐TRD patients. No difference was found between the TRD bipolar and the TRD unipolar patients, or between the non‐TRD bipolar and non‐TRD unipolar patients. An exploratory analysis showed that lithium‐treated patients in both groups had higher GM volume in the superior and middle frontal gyri in both hemispheres. Conclusions Higher GM volume in amygdala detected in TRD patients might be seen in perspective with vulnerability to chronicity, revealed by medication resistance.