Capillary Microscopy of the Nailfold in Psoriatic and Rheumatoid Arthritis

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Abstract
The nailfold capillaries of 35 patients with psoriatic arthritis and 30 with rheumatoid arthritis were studied by capillary microscopy and the findings compared. Healthy subjects [70] served as controls. The pronounced subpapillary plexus visibility, greater number of vessels and their elongation are indicative of rheumatoid arthritis, while shorter, fewer capillaries and especially characteristic psoriatic capillaries, when present, suggest psoriatic arthritis. Sluggish blood flow, higher number of hemorrhages and higher subpapillary plexus visibility are common to both patient groups as opposed to the controls.

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