Brain morphometry and intelligence quotient measurements in children with sickle cell disease

Rong Chen, Mikolaj A. Pawlak, Thomas B. Flynn, Jaroslaw Krejza, Edward H. Herskovits, Elias R. Melhem

Research output: Contribution to journalArticle

Abstract

OBJECTIVE:: To verify the hypothesis that volume of regional gray matter accounts substantially for variability in intelligence quotient (IQ) score among children with sickle cell disease, who have no magnetic resonance visible infarcts. METHODS:: We studied 31 children with sickle cell disease, homozygous for hemoglobin S, with no history of stroke, no magnetic resonance signal-intensity abnormality, and transcranial Doppler velocities <170 cm/sec, with a T1-weighted magnetic resonance sequence and the Kaufman Brief Intelligence Test. On the basis of Kaufman Brief Intelligence Test, we classified these children into 2 groups: high and low IQ based on a median split. We then used an automated and novel Bayesian voxel-based morphometry technique, called Graphical-Model-Based Multivariate Analysis (GAMMA), to assess the probabilistic association between IQ score and regional gray matter volume. RESULTS:: GAMMA found 1 region linking low IQ with smaller cortical gray matter volume. In comparison with the children in the high-IQ group, children in the low-IQ group had smaller regional gray matter volume in both frontal lobes, both temporal lobes, and both parietal lobes. CONCLUSIONS:: In children with sickle cell disease, we found a linear association between IQ and regional gray matter volume. This finding suggests that some variance in intellectual ability in children with sickle cell disease is accounted for by regional variability of gray matter volume, which is independent of neuroradiological evidence of infarct.

Original languageEnglish (US)
Pages (from-to)509-517
Number of pages9
JournalJournal of Developmental and Behavioral Pediatrics
Volume30
Issue number6
DOIs
StatePublished - Dec 2009

Keywords

  • Brain morphometry
  • Intelligence
  • Magnetic resonance
  • Psychological tests
  • Sickle cell disease

ASJC Scopus subject areas

  • Pediatrics, Perinatology, and Child Health
  • Developmental and Educational Psychology
  • Psychiatry and Mental health

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