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This paper deals with the possible identification of somatic and autonomic nerve damage in patients with peripheral obliterative arterial disease (POAD) at different stages of the disease, with a well-reproducible technique like electroneurographic evaluation of nerve conduction. In 64 patients with intermittent claudication, 19 patients with pain at rest, and 7 patients with trophic ulcers, electroneurographic evaluation of motor (tibial and peroneal) and sensory (superficial peroneal and sural) nerve conduction was performed. The median nerve (motor and sensory) was used as control. A severe impairment of sural and superficial peroneal nerve velocities was evident in many claudicant patients and in all patients with pain at rest and trophic ulcers, with a progression in the conduction abnormalities in advanced stages of the disease. Motor nerve conduction showed only minor reductions in patients with claudication and pain at rest, although some of them did show very poor velocity values. In 21 patients with intermittent claudication and sensory nerve abnormalities, the autonomic fibers activity, evaluated by the skin sympathetic response (SSR) test, was significantly depressed, thus suggesting an involvement of the local autonomic system in the ischemic disease. A correlation exists between the severity of the somatic nerve damage and the stage of the vascular insufficiency. However, in the group of claudicant patients, the evidence of similar ischemic threshold (claudication distance) may be associated with a marked difference in the amount of somatic nerve damage. The somatic and autonomic nerve alterations may play a relevant role in the progression of the disease toward critical limb ischemia.
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