A A 64 year old female complains of difficulty swallowing and arising from chairs.
Examination shows asymmetric patchy weakness, especially in the quadriceps and hand grip.
Serum CK is 300. A 20 year old male noted muscle discomfort during intense exercise. Serum CK is 500. EMG is myopathic. A 35 year old male is admitted to the ICU for respiratory failure.