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Local cold exposure test as therapy control in patients with Raynaud's phenomenon: comparison between laser Doppler fluxmetry and simultaneous red blood cell velocity measurements in nailfold capillaries

Summary Synchronous measurement of laser Doppler flux (LDF) and capillary red blood cell velocity (CBV) was performed in adjacent areas of the same nailfold during a local cold stress test in 12 healthy controls (eight women and four men) and in 22 patients (17 women and seven men) with secondary Raynaud's phenomenon before and after treatment. Two questions were addressed: Are there any differences in the signal pattern between LDF and RBV? Is it possible to detect early on in therapy, before clinical benefit becomes obvious, whether a treatment is successful or not?