Urinary excretion of carnitine in Duchenne muscular dystrophy

The urinary excretion of carnitine by boys with Duchenne dystrophy did not differ significantly from age-matched controls. Since serum and muscle concentrations of carnitine are also normal in Duchenne dystrophy, it cannot be proved that this small molecule leaks from muscle in Duchenne dystrophy. If the muscle surface membrane is abnormally leaky in Duchenne dystrophy, different molecules seem to be affected in different ways.