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Studies Investigate Emerging Trends and Treatment Options for Patients With Sickle Cell Disease
Date:12/6/2009

e with Sildenafil Therapy) was conducted in 10 medical centers in the United States and United Kingdom to test this application in adults and children over 12 years of age with sickle cell disease.

Before starting treatment, potential study participants were given baseline tests, including a Doppler echocardiogram and a six-minute walk test to measure heart and lung function. Seventy-four patients who had a tricuspid regurgitant jet velocity (TRV) of greater than or equal to 2.7 m/s (a sign of suspected high pulmonary blood pressure) and a six-minute walking distance of only 150-500 meters (reflecting decreased exercise capacity) were included in the study. The researchers then randomly assigned the study participants into two groups of 37 patients each. Half of the patients were treated with sildenafil at escalating doses from 20, 40, and 80 mg three times per day, and the other half received a placebo three times per day. In previous studies of patients with primary pulmonary hypertension, the highest dose of sildenafil (80 mg) had the greatest effect on blood circulation; however, to monitor for possible adverse effects associated with escalating doses, the sildenafil doses in this study were increased slowly, with dose increases made every four weeks.

The study was prematurely stopped when a significant number of the patients in the sildenafil treatment arm (46 percent) began experiencing serious side effects (primarily sickle cell pain crises requiring hospitalization), compared with only 22 percent of those in the placebo arm. Headache and blurred vision, which were expected side effects of sildenafil, were also experienced. The patients in the sildenafil group had more headaches (27 percent versus 14 percent) and more blurred vision (11 percent versus 3 percent) than the placebo group.

Prior to stopping the study, 33 patients had completed the 16-week assessment and were found to have no change in TRV value or in the walkin
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SOURCE American Society of Hematology
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