Three-dimensional mapping of hippocampal anatomy in adolescents with bipolar disorder

Carrie E. Bearden, Jair C. Soares, Andrea D. Klunder, Mark Nicoletti, Nicole Dierschke, Kiralee M. Hayashi, Katherine L. Narr, Paolo Brambilla, Roberto B. Sassi, David Axelson, Neal Ryan, Boris Birmaher, Paul M. Thompson

Research output: Contribution to journalArticlepeer-review

Abstract

OBJECTIVE: Early-onset bipolar disorder is thought to be a particularly severe variant of the illness. Continuity with the adult form of illness remains unresolved, but preliminary evidence suggests similar biological underpinnings. Recently, we observed localized hippocampal decreases in unmedicated adults with bipolar disorder that were not detectable with conventional volumetric measures. Using the same three-dimensional mapping methods, we sought to investigate whether a similar pattern exists in adolescents with bipolar disorder. METHOD: High-resolution brain magnetic resonance images were acquired from 16 adolescents meeting DSM-IV criteria for bipolar disorder (mean age 15.5 ± 3.4 years, 50% female) and 20 demographically matched, typically developing control subjects. Three-dimensional parametric mesh models of the hippocampus were created from manual tracings of the hippocampal formation. RESULTS: Controlling for total brain volume, total hippocampal volume was significantly smaller in adolescent patients with bipolar disorder relative to controls (by 9.2%). Statistical mapping results, confirmed by permutation testing, revealed significant localized deformations in the head and tail of the left hippocampus in adolescents with bipolar disorder, relative to normal controls. In addition, there was a significant positive correlation between hippocampal size and age in patients with bipolar disorder, whereas healthy controls showed an inverse relation. DISCUSSION: Localized hippocampal deficits in adolescent patients with bipolar disorder suggest a possible neural correlate for memory deficits observed in this illness. Moreover, age-related increases in hippocampal size in patients with bipolar disorder, not observed in healthy controls, may reflect abnormal developmental mechanisms in bipolar disorder. This possibility must be confirmed by longitudinal studies. Copyright 2008

Original languageEnglish
Pages (from-to)515-525
Number of pages11
JournalJournal of the American Academy of Child and Adolescent Psychiatry
Volume47
Issue number5
DOIs
Publication statusPublished - May 2008

Keywords

  • Hippocampus
  • Juvenile
  • Magnetic resonance imaging
  • Mania
  • Mood disorder

ASJC Scopus subject areas

  • Psychiatry and Mental health
  • Developmental and Educational Psychology

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