Fraternal twins have episodes of fasting hypoglycemia, hypoketonemia, and muscle weakness occurring only during periods of caloric deprivation. One twin dies at 5 months of age. The surviving twin develops a cardiomyopathy, which is diagnosed at 3 years of age.
Carnitine esters are elevated in muscle tissue and in serum. Which of the following is the most likely diagnosis? A. α-L-...