The local microcirculatory dynamics underlying phenomenon of urticarial dermographism (UD) are not yet sufficiently
elucidated in dermatological patients. A fiber optic laser Doppler flowmeter (LDF) was used to monitor skin blood flow
(SBF) changes on the back of the patients with UD before and after application of the series of pressure stimuli (9.8×104, 14.7×104, 19.6×104 and 24.5×104 Pa). All patients acted as self-controls to assess their disease activity by means of SBF values based on response to pressure stimuli before and after treatment with antihistamines, when compared to baseline SBF. Throughout 30 minutes evaluation inter-subject SBF values at pressure-tested sites were noticeably distinguished as high, moderate and low. By LDF we could differentiate the highest development of vascular dynamics after 5 minutes, coming back to normal within about 30 minutes in one group of patients, and the vascular dynamics reaching its maximum in 15 minutes, but with no fade after 30 minutes, in another group of patients. All treatment regimens in both groups of patients by LDF produced a measurable reduction already during 1-2 days of therapy, accompanied by a reduction in SBF baseline values in patients with severe and moderate symptoms of UD.