Proximal-Muscle Weakness Induced by Herbs: Letter

The results of magnetic resonance imaging of the head, electromyography including nerve-conduction study with repetitive stimulation, and blood tests were normal. Results were normal on repeat electromyographic nerve-conduction studies with repetitive stimulation; blood chemistry studies, including measurement of serum potassium, creatine kinase, aldolase, and the erythrocyte sedimentation rate; thyroid-function studies; serum protein electrophoresis; and testing for anti-neuronal nuclear antibodies and myasthenia gravis antibodies.