J Neuropsychiatry Clin Neurosci 1991; 3:314-319
Copyright © 1991 by American Neuropsychiatric Association
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RANDOMIZED CONTROLLED TRIAL |
The relationship of serum anticholinergic activity to mental status performance in an elderly nursing home population
GD Tollefson, J Montague-Clouse and SP Lancaster
Department of Psychiatry, St. Paul-Ramsey Medical Center, Minnesota 55101.
Adverse drug reactions among elderly patients pose a significant clinical
problem. The authors used a serum radioreceptor assay [RRA] to quantify
drug-induced muscarinic blockade in 34 randomly selected nursing home
residents. A random intervention group and the nonintervention control
subjects were then retested 4 weeks later. The reduction of serum
antimuscarinic activity (as determined by RRA) did relate to changes on
several measures of cognitive function. A calculated "antimuscarinic index"
lost significance with the RRA following intervention and may have
overestimated the impact of a dosage reduction.