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Peripheral neuropathy in tetanus : a clinical, neuroelectrophysiological and histological evaluation.

Nineteen patients (14 males and 5 females), who had tetanus were evaluated for polyneuropathy by clinical examination, neuroelectromyography and sural nerve biopsy. Three patients (16) had clinically evident distal symmetrical polyneuropathy. Therewas a significant prolongation of mean median motor distal latency (p<0.02) peroneal motor distal latency (p<0.001) and reduction of sural sensory nerve action potentials (p<0.001) in these patients in comparison to controls. Electromyographic sampling of tibialis anterior muscle revealed wide variation in motor unit action potential duration and amplitude. Denervation phenomena including fibrilations and positive sharp waves were present in 4 patients (21) and complex repetitive discharges were present in 9 patients (47.4). Sural nerve histology was performed in 9 patients. It revealed mild to moderate loss of myelinated fibres in 4 cases (44.4). There is evidence that in tetanus there is a distal predominantly sensory polyneuropathy.