The purpose of this study is to evaluate pharmacodynamics (PD) in adult subjects with a diagnosis of Raynaud's Phenomenon secondary to Systemic Sclerosis (SSc).
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Pharmacodynamic evaluation: digital perfusion by laser Doppler capillary velocimetry and on digital temperature recovery with thermography.
Timeframe: two hours (intermittently) after cold-challenge and post-dose
Safety assessments based on review of adverse events, vital sign measurements, electrocardiograms, physical examinations, and clinical laboratory tests.
Timeframe: One month