Table 2.

Symptoms and observations suggestive of potential PD [3,11,13].

Infantile Form	Late-Onset Form
Potential patient group(s) Infants Symptoms and observations Poor feeding/failure to thrive Muscle weakness Respiratory difficulty Cardiac problems Shortened PR interval with a broad and wide QRS complex Cardiomegaly Left ventricular outflow obstruction Cardiomyopathy	Potential patient group(s) Infants, children, juveniles, and adults Symptoms and observations Proximal muscular weakness Respiratory insufficiency Typically rare cardiac involvement