NCT00317421

Effect of Regular Sildenafil on Blood Pressure and Arterial Function in Hypertension

Effects of Regular Treatment With Sildenafil on Blood Pressure and Endothelial Function in Untreated Hypertensives

• Status: Completed
• Phase: Phase 2
• Study type: Interventional
• Enrollment: 20 (planned)
• Sponsor: University of Edinburgh · Academic / Other
• Sex: All
• Age: 0 Years
• Healthy volunteers: Not accepted

Summary

The purpose of the study is to investigate if regular treatment with sildenafil reduces blood pressure and improves blood vessel function in patients with hypertension (high blood pressure).

Detailed description

Inhibitors of phosphodiesterase type 5 (PDE5), such as sildenafil, relax blood vessels. In the penis this facilitates erection and sildenafil has proved a very effective treatment for male erectile dysfunction. To date, most work on the effects of sildenafil on blood pressure have mainly been investigated in single dose studies. These have shown that sildenafil causes a modest reduction in blood pressure, even when taken with other blood pressure-lowering drugs, providing reassurance on safety when taken as a single dose for erectile dysfunction. However, these studies do not offer any insight into the potential of PDE5 inhibition in the long-term treatment of hypertension. We will address this question by investigating the effects of regular administration of sildenafil on blood pressure. It may also be postulated that, because of its mechanism of action, sildenafil will also improve the function of the endothelium, the single layer of cells that lines all blood vessels. Therefore, the effect of regular sildenafil on endothelial function in hypertension will also be investigated in the study. The study will be performed in a randomised, placebo-controlled, double blind, 2-way crossover manner. Sildenafil and matched placebo will each will taken three times daily for 2 weeks, with a washout of at least 6 days between treatments. Measurements will be made acutely (before and 1 hour after oral sildenafil) of heart rate, blood pressure, pulse wave analysis (a measure of wave reflection in arteries), pulse wave velocity (a measure of arterial stiffness) and flow-mediated dilatation (a measure of endothelial function). These measurements will be repeated 2 weeks later (again just before and 1 hour after oral sildenafil). In addition, ambulatory blood pressure will be recorded after 2 weeks of treatment (baseline ambulatory BP will be taken as the recording made at diagnosis).

Conditions

• Hypertension

Interventions

Type	Name	Description
DRUG	Sildenafil citrate

Timeline

• Start date: 2004-03-01
• Completion: 2005-11-01
• First posted: 2006-04-24
• Last updated: 2006-04-24

Locations

1 site across 1 country: United Kingdom