The association between medication use and cognitive performance in people with SCI.

Abstract

Polypharmacy is common in people with spinal cord injury (SCI). Given the high rates of medication use, and the complicated side effect profile of many of the medications that are regularly prescribed in people with SCI, we were interested in the association between the use of different classes of medications and cognitive function in these individuals. Research Method/Design: One-hundred and 73 people with SCI participated in an observational study. Self-reported medications were provided by participants. Participants also completed several cognitive tests designed to capture multiple aspects of cognition (processing speed, attention, working memory, learning, free-recall memory, delayed free recall memory, executive function), as well as a self-report measure that captures participant perceptions of cognitive function. A series of multivariable linear regressions were used to test for associations between medications and the seven measures of cognition. In general, there was not a robust relationship between medication use and cognitive function; the sole exception was an association between opioid use and subjective cognitive function. There was some preliminary support for an association between medication use, especially benzodiazepine and opioid analgesic use, and poorer cognitive performance. Specifically: Opioid analgesic use was associated with slowed processing speed, worse attention, poorer working memory, poorer executive function and more subjective cognitive complaints; benzodiazepine use was associated with slower processing speed, poorer working memory, and worse executive function; anticonvulsant use was related to worse delayed free recall memory; and the number of medication categories a person with SCI was taking was related to slower processing speed, and worse subjective cognitive function. Antidepressant, cannabis, skeletal muscle relaxant, sedative and stimulant use were not significantly related to cognitive performance, nor to subjective reports of cognitive function. Findings did not support a strong relationship between medication use and cognitive function in people with SCI. There is some preliminary support for an association between benzodiazepine use and cognitive performance, but this needs to be confirmed in future research. (PsycInfo Database Record (c) 2021 APA, all rights reserved).