[Paraplegia following acute infrarenal aortic occlusion (author's transl)].

The clinical syndrome of paraplegia following acute occlusion of the infrarenal aorta may be caused by either ischemic spinal cord damage or ischemia of the cauda equina and sacral nerve roots and ganglia. The neurologic manifestations are similar and therefore specific anatomic diagnosis is difficult. From October 1972 to February 1975 a total of 31 patients with infrarenal aortic occlusion were treated at the Medizinische Hochschule in Hannover. In nine cases the occlusion up to the renal arteries was acute. Three of these patients presented beside acute ischemic manifestations on both legs and the lower abdominal wall, neurologic symptoms of paraplegia. The anatomic and hemodynamic aspects of ischemic spinal cord damage and those of ischemic lesions of the cauda equina and peripheral nerves are discussed. There appear to be three main mechanisms responsible for vascular paraplegia following acute infrarenal occlusion of the aorta: 1. it may be caused by thrombotic occlusion of a major radicular artery which arises below the level of occlusion. 2. it may be produced by thrombosis of a lumbar collateral acting as major supply to the cord when arteriosclerotic narrowing of the major radicular artery is present. Especially in states of severe hypotension critical interference of blood supply to the spinal cord will result. 3. Paraplegia by ischemia of the cauda and peripheral nervous tissue may also follow prolonged interruption of circulation to this area supplying spinal vessels from low lumbar and sacral arteries.