Blood flow is abnormal.The number of nailfold microcirculation capillary loops decrease, while deviant capillary loops increase.Capillary loops are shortened.

• 甲襞微循环异常，主要表现为流态异常、襻顶瘀血、异型管襷数量增多、红细胞聚集、管襷长度缩短、开放管襷数量减少、襷周渗出等。