Unique forms of the postthrombotic syndrome

: A prospective study was made with a view to analyse and to identify two particular forms of the post-thrombotic syndrome. The post-thrombotic syndrome of the shank can be recognized on the basis of the clinical and of the phlebographic examination. It has a serious prognosis and can be treated either conservatively or by surgery according to case. Its frequency is probably higher than it was presumed on the basis of the first observations. The post-thrombotic venous obstruction may be a cause of arterial ischemia during effort but this occurs only in very few cases. This particular syndrome is manifested as intermittent claudication which occurs in the clinical picture of chronic orthostatic venous failure. The probable mechanism is the direct effect of increased pressure in the arterial and venous circulation in vessels with normal walls, as a result of an important obstruction in the return circulation. Lumbal sympathectomy appears to improve durable claudication and hyperhidrosis.