Transcranial Electrical Stimulation for Management of Orthostatic Instability in Acute Cervical Spinal Cord Injury
Individuals with acute cervical spinal cord injury (SCI) can suffer from an excessive and prolonged fall in blood pressure when assuming an upright position, such as transitioning from lying to sitting or standing, a condition also known as orthostatic hypotension (OH). Due to a decrease in cerebral oxygenation, affected individuals can develop debilitating symptoms including lightheadedness, blurred vision, fatigue and even loss of consciousness. Recent evidence suggests that OH has a negative impact on cognition in individuals with SCI. Clinical observations suggest that OH can lead to neurological deterioration in individuals who may otherwise have a stable SCI. The presence of symptomatic OH prevented participation in 43% of physical therapy treatment sessions in a study of individuals with acute SCI despite the use of current treatment options. OH is known to adversely affect health, delay rehabilitation and prolong hospitalization in the acute phase of management of individuals who display it. Our team found OH was present in 41 of 55 (75%) patients with acute cervical SCI at our center in 2004.
We plan to research the efficacy of a low-cost, non-invasive device known as transcranial electrical stimulation (TES) to manage OH in individuals with acute cervical SCI. Previous studies have shown that this device is safe to use in individuals with SCI, and has improved blood pressure control in non-SCI individuals.
We hypothesize that in individuals with acute cervical SCI and OH, TES intervention will elicit an attenuation of the drop in systolic BP (SBP)in response to orthostatic stress. TES-induced differences will be most pronounced in those individuals with sparing of spinal autonomic pathways
|Orthostatic Hypotension Postural Hypotension||Device: transcranial electrical stimulation||Phase 2|
|Study Design:||Intervention Model: Single Group Assignment
Masking: None (Open Label)
Primary Purpose: Treatment
|Official Title:||Transcranial Electrical Stimulation for Management of Orthostatic Instability in Acute Cervical Spinal Cord Injury|
- Change in orthostatic decrease in BP in response to six sessions of TES, determined via the established bedside sit-up test [ Time Frame: The change in BP will be measured between time points: 1. immediately before first TES session and 2. immediately after last TES session. ]In brief, the subject will receive six sessions of thirty minutes duration of transcranial electrical stimulation. Immediately after the last session, the subject will be monitored via finger BP cuff in the supine position for 10 minutes resting BP. Next the subject will be transferred to the sit-up position with continuous BP recording. The decline in BP at three minutes (orthostatic decrease) following assumption of the sit-up posture will be documented.
- Long term change in BP. [ Time Frame: Change in BP between timepoints 1. immediately before first TES session and 2. 3 weeks after last TES session. ]
|Study Start Date:||May 2013|
|Study Completion Date:||July 2015|
|Primary Completion Date:||July 2015 (Final data collection date for primary outcome measure)|
Experimental: Transcranial electrical stimulation
Subject will be determined as autonomically complete or incomplete injury with measuring of the sympathetic skin responses (SSR+), an established protocol for measuring integrity of sympathetic spinal pathways, versus complete autonomic injury (SSR-).
Device: transcranial electrical stimulation
TES: medical device TRANSAIR: electrodes placed on the forehead and over the mastoid processes using Velcro straps. Treatment protocol: six 30-minute sessions over a two-week period and stimulation variables (bipolar current; 1.0-3.0 milliamp (mA) amplitude, 3.5 ms duration and 77.5 Hz frequency).
Other Name: TRANSAIR (TES Center, St Petersburg, Russia)
Please refer to this study by its ClinicalTrials.gov identifier: NCT01874782
|Canada, British Columbia|
|GF Strong Rehabilitation Center - Vancouver Coastal Health Research Institute|
|Vancouver, British Columbia, Canada, V5Z 2G9|
|Principal Investigator:||Patricia B Mills, MD FRCPC||University of British Columbia|