Hemostatic abnormalities in Sneddon's syndrome.

Sneddon's syndrome is a rare condition comprising widespread livedo retucularis and multiple episodes of transient cerebral ischemia. Treatment to date has been empirical. The hemostatic/thrombotic status of 4 patients with Sneddon's syndrome was studied by a unique technique, hemostatometry, which measures primary hemostasis (shear-induced platelet plug formation), the overall coagulation, and thrombolysis (dislodgment of the hemostatic plugs) from nonanticoagulated blood. In all 4 patients, platelet reactivity, which shows itself in the initial phase of the hemostatic reaction, was enhanced. The overall hemostasis, in which the generation of thrombin by activated platelets plays the decisive role, was enhanced in 3 patients. Three of the 4 patients had hypercoagulation, and in 3, spontaneous thrombolysis was inhibited. Treatment was commenced with aspirin and nifedipine, and patients were monitored both clinically and by serial hemostatometry over two years. One patient had one further transient ischemic episode; the other 3 remained asymptomatic. Thus, the observed clinical improvement correlated with improvement of the hemostatic profile.