Electrophysiological studies in the post-viral fatigue syndrome.

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Abstract
Single fibre electromyography (SFEMG) was studied in 40 patients with the post-viral fatigue syndrome. These patients were also assessed clinically, serologically, virologically and immunologically. About 75% of the patients had definitely abnormal SFEMG results. This was regarded as evidence of abnormality in the peripheral part of the motor unit. The muscle fibre was the likely site of involvement.