Serum creatine kinase levels were moderately elevated, and electromyogram (EMG) showed a myopathic pattern of abnormalities. Muscle biopsies were performed in all affected patients. By light ...

Needle EMG examination provides ... and reduced recruitment. Myopathic changes include short duration, small amplitude polyphasic potentials with normal recruitment patterns.

SAN DIEGO — The use of electromyograms and nerve conduction studies are essential to excluding alternative diagnoses and confirming muscle disease when evaluating patients with suspected ...