Topical 10 % Nifedipine Versus 5% Sildenafil in Secondary Raynaud

Objective: To compare the efficacy of topical 10% nifedipine versus 5% sildenafil in patients with secondary Raynaud's phenomenon (RP). Methods: A randomized, double-blind, placebo-controlled pilot study took place in 10 patients with secondary RP. Topical 10% nifedipine on one hand and 5% sildenafil on the other hand were applied. The thumbs didn't receive any cream and served as a control group. The primary outcome was the improvement of blood flow and vessel diameter of the digital arteries measured by high frequency color Doppler ultrasound before and 1 hour after treatment.