| Mild head injury tied to psychosocial problems |
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Most cases of mild head injury in young children do not produce any adverse effects, but long-term problems in psychosocial functioning can result from the more severe mild injuries, new findings show. Audrey McKinlay, of the University of Canterbury in New Zealand, and colleagues conducted a prospctive, longitudinal birth cohort study of 132 children who sustained a mild head injury before the age of 10. Children were divided into two groups on the basis of whether they required impatient (N=36) or outpatient care ( N=96) and compared with a reference group of children without head injury (N=613-807) that varied in size depending on variables and missing data. Assessments included a combined version of the Rutter and Connors maternal report questionnaires, Wechsler Intelligence Scale for Children - Revised (WISC-R), Burt Word Reading Test and the Progressive Achievement Test (PAT). "Our study was unique in that it divided the mild head injury group according to level of severity, giving us an inpatient and outpatient group," Mckinlay said in an interview with The Brown University Child & Adolescent Behavior Letter. "The division of the group in this way enabled us to provide an answer to the conflicting views on the effects of mild head injury by showing that adverse outcomes were associated with more severe mild head injury (inpatient cases), whereas less severe mild head injury (outpatient cases) resulted in no detectable deficits." McKinlay's team found that after controlling for potential confounds, the inpatient but not the outpatient group showed an increased number of behaviors associated with hyperactivity/inattention and conduct disorder between the ages of 10 and 13 years, as rated by both mothers and teachers (both p<0.001). In addition they found that these deficits were more prevalent in the inpatient subgroup who had been injured before age five relative to controls, based on mother (p<0.001) and teacher ratings (p<0.01) of hyperactivity/inattention and on combined conduct ratings (all p<0.001). There were no clear effects evident for any of the cognitive/academic measures, irrespective of injury severity or age at injury. McKinlay explained that mild head injury is a common event in childhood, but noted that until now it has generally been considered to be a relatively benign event. "The findings of this study alert clinicians to the fact that some instances of mild head injury in childhood may result in psychosocial problems later in life, McKinlay said. "It also provides some information that may be used in clinical settings, regarding the identification of children who are more likely to have ongoing problems." She added, "More importantly, this study indicates a need for greater awareness of early injuries and adds to growing evidence that brain injury during early life, even mild brain injury, does not necessarily have less adverse outcomes." McKinlay A, Dalrymple-Alford JC, Horwood LJ, et al.: Long-term psychosocial outcomes after mild head injury in early childhood. Journal of Neurology, Neurosurgery and Psyshiatry 2002; 73:281-288. Correspondence to: Audrey McKinlay, Department of Psychology, University of Canterbury, and Christchurch Movement Disorders and Brain Research Group, Christchurch, NewZealand. aco24@student.canterbury.ac.nz |