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Clinical Trial Details — Status: Recruiting

Administrative data

NCT number NCT01347008
Other study ID # FAPESP 2011/00012-3
Secondary ID
Status Recruiting
Phase Phase 3
First received May 2, 2011
Last updated May 3, 2011
Start date April 2011
Est. completion date April 2012

Study information

Verified date April 2011
Source Federal University of São Paulo
Contact Fernando V Andrigueti, MD
Phone 55 11 55764239
Email fe_villela@yahoo.com.br
Is FDA regulated No
Health authority Brazil: National Committee of Ethics in Research
Study type Interventional

Clinical Trial Summary

Early phases of systemic sclerosis is characterized by inflammatory and microvasculature alterations. Sildenafil citrate has been shown to have vasodilatory effects and to enhance vasculogenesis. The purpose of this study is to evaluate the effect of sildenafil citrate on hand blood flow of patients with systemic sclerosis, using Laser Doppler Imaging.


Description:

Progressive microangiopathy and endothelial dysfunction are identified in early phases of systemic sclerosis. These alterations may result in progressive reduction of vessel lumen, decreased blood flow, and a state of chronic hypoxia resulting in digital ulcers, digital pitting, and, in more severe cases, gangrene and amputation of the extremities. Few studies aimed to evaluate the effects of Sildenafil on the microcirculatory blood flow in patients with Raynaud's phenomenon secondary to systemic sclerosis (SS). Moreover, no study has evaluated the effect of this drug on the number and function of endothelial progenitor cells in SS patients. The relatively new technique of laser Doppler imaging (LDI) allows an objective measurement of superficial cutaneous microvascular blood flow and constitutes a promising approach in the assessment of the digital microvascular vasoreactivity in response to cold stimulus or in response to treatment in SSc patients.


Recruitment information / eligibility

Status Recruiting
Enrollment 44
Est. completion date April 2012
Est. primary completion date April 2012
Accepts healthy volunteers No
Gender Both
Age group 18 Years and older
Eligibility Inclusion Criteria:

- Systemic sclerosis according to the classification criteria of the American College of Rheumatology (1980) with no more than 4 years since diagnosis

- Early systemic sclerosis as defined by LeRoy and Medsger (2001)

- 6 or more Raynaud's crisis per week

- Written informed consent provided by the subjects prior to initiating study procedures

Exclusion Criteria:

- Smoking

- Peripheral or central vasculopathy other than Systemic sclerosis

- Uncontrolled Diabetes

- Liver disease

- Pregnant or lactating woman

- Current use of cyclosporin, prostanoids, bosentan or any PDE-5 inhibitors (including current Sildenafil use during randomization)

- History of stroke, myocardial infarction or life threatening cardiac condition within the last 6 months

- History of surgical sympathectomy

- Systolic blood pressure < 85mm Hg

- History of scleroderma renal crisis

- Known hypersensitivity to Sildenafil or any of the excipients

- History of Retinitis Pigmentosa

- Current use of Nitrates

Study Design

Allocation: Randomized, Endpoint Classification: Efficacy Study, Intervention Model: Parallel Assignment, Masking: Double Blind (Subject, Caregiver, Investigator, Outcomes Assessor), Primary Purpose: Treatment


Intervention

Drug:
Sildenafil citrate
Oral sildenafil citratre, 50mg b.i.d., 8 weeks
Placebo
Placebo pills similar to sildenafil citrate pills, b.i.d for 8 weeks

Locations

Country Name City State
Brazil Systemic Sclerosis Outpatient Clinic, Hospital Sao Paulo, UNIFESP Sao Paulo SP

Sponsors (2)

Lead Sponsor Collaborator
Federal University of São Paulo Fundação de Amparo à Pesquisa do Estado de São Paulo

Country where clinical trial is conducted

Brazil, 

Outcome

Type Measure Description Time frame Safety issue
Primary Digital skin microvascular blood flow by means of Laser Doppler Imaging (LDI). 8 weeks No
Secondary Number and proliferative capacity of endothelial progenitor cells (EPC) 8 weeks No
Secondary Serum levels of vascular endothelial growth factor (VEGF) 8 weeks No
Secondary Clinical features of Raynaud's phenomenon and digital ulcers Raynaud's Condition Score, HAQ and specific VAS scales for Raynaud's phenomenon and disability. 8 weeks No
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