Differentiation of vascular and neurogenic claudication.

Lower extremity pain caused by exercise but relieved by rest is usually a reliable symptom of chronic arterial insufficiency. However, similar discomfort often occurs in patients who have neurospinal compression. Furthermore, both arterial occlusive disease and neurogenic causes of lower extremity discomfort may present simultaneously. Forty patients with symptoms that suggested intermittent claudication comprised our study group. All had non-arterial cause of their complaint. The nonvascular origin of the symptoms was suggested initially by clinical evaluation in 30 patients and by noninvasive evaluation in 25 patients. The neurospinal origin of symptoms was obscured in 15 patients because of the concomitant presence of significant arterial occlusive disease as demonstrated by noninvasive arterial testing. Twelve of these 15 patients underwent arterial reconstruction, which did not relieve their symptoms. Subsequently, the neurospinal origin of their symptoms was proven by appropriate evaluation and therapy. Forms of evaluation that proved helpful in the differential diagnosis were lumbosacral spine x-rays, electromyography, nerve conduction velocity studies, computerized tomography, Doppler noninvasive assessment and, at times arteriography and contrast myelography.