Document Detail


Evidence of brain overgrowth in the first year of life in autism.
MedLine Citation:
PMID:  12865374     Owner:  NLM     Status:  MEDLINE    
Abstract/OtherAbstract:
CONTEXT: Autism most commonly appears by 2 to 3 years of life, at which time the brain is already abnormally large. This raises the possibility that brain overgrowth begins much earlier, perhaps before the first clinically noticeable behavioral symptoms. OBJECTIVES: To determine whether pathological brain overgrowth precedes the first clinical signs of autism spectrum disorder (ASD) and whether the rate of overgrowth during the first year is related to neuroanatomical and clinical outcome in early childhood. DESIGN, SETTING, AND PARTICIPANTS: Head circumference (HC), body length, and body weight measurements during the first year were obtained from the medical records of 48 children with ASD aged 2 to 5 years who had participated in magnetic resonance imaging studies. Of these children, 15 (longitudinal group) had measurements at 4 periods during infancy: birth, 1 to 2 months, 3 to 5 months, and 6 to 14 months; and 33 (partial HC data group) had measurements at birth and 6 to 14 months (n = 7), and at birth only (n = 28). MAIN OUTCOME MEASURES: Age-related changes in infants with ASD who had multiple-age measurements, and the relationship of these changes to brain anatomy and clinical and diagnostic outcome at 2 to 5 years were evaluated by using 2 nationally recognized normative databases: cross-sectional normative data from a national survey and longitudinal data of individual growth. RESULTS: Compared with normative data of healthy infants, birth HC in infants with ASD was significantly smaller (z = -0.66, P<.001); after birth, HC increased 1.67 SDs and mean HC was at the 84th percentile by 6 to 14 months. Birth HC was related to cerebellar gray matter volume at 2 to 5 years, although the excessive increase in HC between birth and 6 to 14 months was related to greater cerebral cortex volume at 2 to 5 years. Within the ASD group, every child with autistic disorder had a greater increase in HC between birth and 6 to 14 months (mean [SD], 2.19 [0.98]) than infants with pervasive developmental disorder-not otherwise specified (0.58 [0.35]). Only 6% of the individual healthy infants in the longitudinal data showed accelerated HC growth trajectories (>2.0 SDs) from birth to 6 to 14 months; 59% of infants with autistic disorder showed these accelerated growth trajectories. CONCLUSIONS: The clinical onset of autism appears to be preceded by 2 phases of brain growth abnormality: a reduced head size at birth and a sudden and excessive increase in head size between 1 to 2 months and 6 to 14 months. Abnormally accelerated rate of growth may serve as an early warning signal of risk for autism.
Authors:
Eric Courchesne; Ruth Carper; Natacha Akshoomoff
Related Documents :
1576604 - Correlation of ventricular size and head circumference after severe intra-periventricul...
17684214 - A double-blind, placebo-controlled, glutamine-supplementation trial in growth-faltering...
6224924 - Longitudinal growth and late morbidity of survivors of gastroschisis and omphalocele.
2923124 - Longitudinal studies of infectious diseases and physical growth of infants in huascar, ...
24108664 - Fetal thrombotic vasculopathy and perinatal thrombosis: should all placentas be examined?
11497534 - Exposure to soy-based formula in infancy and endocrinological and reproductive outcomes...
Publication Detail:
Type:  Journal Article; Research Support, U.S. Gov't, P.H.S.    
Journal Detail:
Title:  JAMA : the journal of the American Medical Association     Volume:  290     ISSN:  1538-3598     ISO Abbreviation:  JAMA     Publication Date:  2003 Jul 
Date Detail:
Created Date:  2003-07-16     Completed Date:  2003-07-18     Revised Date:  2007-11-14    
Medline Journal Info:
Nlm Unique ID:  7501160     Medline TA:  JAMA     Country:  United States    
Other Details:
Languages:  eng     Pagination:  337-44     Citation Subset:  AIM; IM    
Affiliation:
Department of Neuroscience, School of Medicine, University of California, San Diego, La Jolla, USA. ecourchesne@ucsd.edu
Export Citation:
APA/MLA Format     Download EndNote     Download BibTex
MeSH Terms
Descriptor/Qualifier:
Anthropometry
Autistic Disorder / diagnosis,  pathology*
Brain / growth & development*,  pathology*
Cephalometry
Child, Preschool
Female
Head / growth & development
Humans
Infant
Longitudinal Studies
Magnetic Resonance Imaging
Male
Grant Support
ID/Acronym/Agency:
2-RO1-NS-19855/NS/NINDS NIH HHS
Comments/Corrections
Comment In:
JAMA. 2003 Jul 16;290(3):393-4   [PMID:  12865381 ]

From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine


Previous Document:  Growth hormone receptor expression in atrophying muscle fibers of rats.
Next Document:  Effect of behavioral training with or without pelvic floor electrical stimulation on stress incontin...