Effect of Tadalafil (Cialis) on the Cardiovascular System of Spinal Cord Injury (SCI) Males
To address the effect of tadalafil (Cialis) on the cardiovascular system of men with complete spinal cord injury at T-6 and above. The hypothesis is that tadalafil will cause significant hypotension in people with tetraplegia.
|Study Design:||Allocation: Randomized
Intervention Model: Crossover Assignment
Masking: Double Blind (Subject, Caregiver, Investigator, Outcomes Assessor)
Primary Purpose: Treatment
|Official Title:||A Randomized, Double-blind, Placebo-controlled Cross-over Trial Assessing the Effect of Tadalafil (Cialis) on the Cardiovascular System in Men With Complete Spinal Cord Injury (SCI) at or Above the Sixth Thoracic Level|
- Supine and sitting blood pressure and heart rate (HR), as well as perceived dizziness upon sitting up. [ Time Frame: Pre-dose, 1 hour, 2, 4, 12, 22, 29 and 36 hours post-dose. ] [ Designated as safety issue: Yes ]
|Study Start Date:||October 2009|
|Estimated Study Completion Date:||December 2013|
|Estimated Primary Completion Date:||October 2013 (Final data collection date for primary outcome measure)|
Active Comparator: tadalafil 20 mg
Oral study medication to be administered once to each participant
20 mg tablet, administered once per study protocol
Other Name: Cialis
Placebo Comparator: placebo
oral study medication to be administered once to each study participant
placebo tablet administered once per study protocol
Tadalafil is a long-acting PDE-5 inhibitor, used to treat erectile dysfunction (ED). ED is a common issue for males with spinal cord injury (SCI).Patients with SCI are at risk of developing orthostatic hypotension, especially those with an injury at or above the T-6 level.An earlier study of the shorter-acting PDE-5 inhibitor sildenafil (Viagra) revealed that it can cause orthostatic hypotension, tachycardia and dizziness after administration in the SCI population, and suggested that caution should be used in prescribing sildenafil in this population, as blood pressure can drop significantly. There is potential for the significant hypotension seen with the short-acting medications to be much more problematic with the longer-acting tadalafil.
The study will be a prospective, randomized, double-blind, placebo-controlled cross-over design. This will be done by comparing the effects of administering tadalafil 20 mg and placebo on blood pressure (lying and sitting), and heart rate (lying and sitting). These measurements will be taken in the clinic setting prior to dosing, then repeated hourly for the first two hours post-dose, and again at four hours post-dose. The patient will repeat the measurements at home using an automated blood pressure apparatus at 12, 22,29 and 36 hours post-dose.In addition, the patient will record perceived dizziness on a visual analog scale ecah time the BP and HR are recorded.
|Health Sciences Centre Rehabilitation Hospital|
|Winnipeg, Manitoba, Canada, R3A 1M4|
|Principal Investigator:||Karen D. Ethans, MD||University of Manitoba|