Deterioration of cutaneous microcirculatory status of Kawasaki disease.

Kawasaki disease (KD) is associated with generalized vasculitis with a predilection for coronary artery leading to ectasia and aneurysm in some cases. The aim of this study was to noninvasively assess the cutaneous microcirculation and correlate it with the coronary artery diameter in these patients. Laser Doppler flowmetry and dynamic capillaroscopy were performed at the nailbeds to assess total cutaneous blood flow and microcirculation in children with KD, both in the afebrile phase (after the resolution of fever) and convalescent phases, in comparison to controls. The 100 subjects analyzed in this study included 64 patients with KD (33 in afebrile phase and 31 in convalescent phase) and 36 normal controls. In KD, the capillary morphology was abnormal when compared to controls, with a larger diameter of the arterial and venous limbs, a higher intercapillary distance and a decrease in the loop numbers. Significantly decreased capillary blood cell velocity was noted in afebrile phase but not in convalescent phase. In the afebrile phase, a decreased capillary blood cell velocity significantly correlated with an increased coronary artery diameter. In conclusion, KD patients, both in the afebrile and convalescent phases, exhibited morphologic alterations in the microcirculation when compared to the controls. The results indicate the potential role of dynamic capillaroscopy for the noninvasive survey of microcirculation abnormalities in patients with KD.