Neurology. 1991 Oct;41(10):1554-7.

Brain injury and neurologic sequelae: a cohort study of dementia, parkinsonism, and amyotrophic lateral sclerosis.

Williams DB, Annegers JF, Kokmen E, O'Brien PC, Kurland LT.

Source

Department of Health Sciences Research, Mayo Clinic, Rochester, MN.

Abstract

We reviewed the medical records of 821 Olmsted County residents who had suffered head trauma with presumed brain injury between 1935 and 1974 and were more than 40 years old at the time of their last medical assessment. These patients were followed over 15,000 person-years for dementia and other degenerative neurologic diseases. The standardized morbidity ratio (SMR) for dementia was 1.06, and the SMR for dementia of the Alzheimer type was 1.00. These values are not significantly elevated and are inconsistent with studies that suggest that head trauma is a risk factor for Alzheimer's disease. In addition, the SMRs for parkinsonism (1.04), Parkinson's disease (0.94), and amyotrophic lateral sclerosis (1.05) were not significantly elevated, providing no evidence that head trauma is a risk factor for these disorders. However, these latter results are based on smaller total case numbers.

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