Diverse cognitive impairment after spinal cord injury is associated with orthostatic hypotension symptom burden

Research output: Contribution to journalArticlepeer-review

Authors

Colleges, School and Institutes

External organisations

  • International Collaboration On Repair Discoveries (ICORD)
  • University of British Columbia
  • University of Calgary
  • GF Strong Rehabilitation Centre, Vancouver Coastal Health, Vancouver

Abstract

This study: 1) compared cognitive functioning between individuals with chronic (>1 year) spinal cord injury (SCI) and non-injured controls and, 2) assessed associations between symptoms of autonomic dysreflexia and orthostatic hypotension with cognitive functioning in SCI participants with a history of unstable blood pressure (BP). Thirty-two individuals with SCI (C4–L2, American Spinal Injury Association Impairment Scale A-D) and thirty age, sex-matched non-injured controls participated in this study. Participants completed a motor-free neuropsychological test battery assessing 1) memory, 2) attention/concentration/psychomotor speed and, 3) executive function. Nineteen participants with SCI who had injuries ≥T6 and a history of unstable BP also completed the Autonomic Dysfunction Following Spinal Cord Injury (ADFSCI) questionnaire. Cognitive function was significantly lower in people with SCI across measures of memory and executive function compared to non-injured controls. Significant, moderate-to-large associations were observed between cumulative (frequency x severity) orthostatic hypotension and total BP instability symptoms scores, with measures of attention/concentration/psychomotor speed and executive function. These data demonstrate a 10 – 65% reduced performance across specific realms of cognitive functioning in individuals with SCI relative to non-injured controls. Furthermore, cumulative subjective scores for symptoms of unstable BP were associated with diverse cognitive deficits. These findings, in individuals without co-occurring traumatic brain injury, imply cardiovascular dysregulation plays a role in cognitive deficits observed in this population.

Details

Original languageEnglish
Article number112742
Number of pages6
JournalPhysiology and Behavior
Volume213
Early online date16 Nov 2019
Publication statusPublished - 1 Jan 2020

Keywords

  • Autonomic dysreflexia, Blood pressure, Cognition, Orthostatic hypotension, Spinal cord injuries