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The coronary slow flow phenomenon (CSFP) is the delayed opacification of coronary arteries in the absence of significant stenosis. The pathogenesis of CSFP has not been completely understood yet. There are several proposed mechanisms such as the structural and functional abnormalities in coronary microcirculation. Nail fold capillaroscopy is a simple, noninvasive examination of the microvasculature and suggested to be a useful technique for analysis in various inflammatory and autoimmune diseases. In this study; we hypothesized that; CSFP is a part of systemic vascular entity rather than a problem confined to coronary vasculature and our aim was to investigate the nail fold capillaries of the patients with CSFP and compare to those with normal coronary flow (NCF). The study was designed as a case-control study and total 25 patients (10 male, mean age 55±9 years) with documented CSFP, and 24 …