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Sixty-two patients with arterial disease of the lower limbs were treated with streptokinase by intermittent administration. All patients had experienced recent aggravation of their arterial disease, and 22 bad thrombolysis confirmed by arteriograpby. In 20 cases clinical study showed repermeation - in 8 cases during the first perfusion and in 8 cases during the third perfusion. During the first perfusion the fall in fibrinogen was significantly greater in the 8 patients with thrombolysis. Furthermore, the third perfusion corresponded to a new phase of fibrinogenolysis. These results support the possibility of the relationship between plasminemia and thrombolysis, and emphasize the limits of the classic theory of Sherry, Fletcher, and Alkjaersig. Permitting phases of repeated but limited plasminemia, the interruption method used here is a compromise between the risk of hemorrhage and the efficacy of treatment at low dosage. [ABSTRACT FROM AUTHOR]