Microcirculatory modifications of psoriatic lesions during topical therapy

Background/purpose: Videocapillaroscopy (VCP) can be used to explore microcirculatory modifications in skin diseases. Psoriasis presents a specifically altered capillaroscopic pattern with ‘bushy’ capillaries and a disarranged microangioarchitecture. The aim of the present study is to compare the clinical and capillaroscopic modifications of a psoriatic target lesion during topical therapy. Methods: Thirty patients with chronic plaque psoriasis were included in the study. Clinical and capillaroscopic modifications in comparable lesions of the elbows were analyzed during different topical therapies (calcipotriol, betamethasone dipropionate and calcipotriol plus betamethasone dipropionate) at baseline, and after 15 and 30 days of therapy. A clinical global score (modified Psoriasis Area Severity Index), the mecapillary density per square mm and the mean diameter of capillary loops were measured. Results: Topical therapy with combined betamethasone dipropionate and calcipotriol induced a higher decrease in erythema, infiltration and desquamation ( P <0.001), and a significant reduction of the mean ‘bush’ diameter ( P <0.001) and capillary number/mm 2 ( P <0.05) compared with betamethasone and calcipotriol alone. Microvascular restoration to a normal pattern, as detected by VCP, was faster than clinical improvement ( P <0.05). Conclusion: Videocapillaroscopy is an easily executable and non‐invasive technique that detects early microcirculatory changes in psoriasis during topical therapy.