The Role of Clinical Observation: Red Flag 3 — Cardiomyopathies, Wolff-Parkinson-White Syndrome and Other Electrocardiogram Abnormalities

In patients with a hypertrophic cardiomyopathy (HCM) phenotype, study of the electrocardiogram (ECG) can sometimes suggest a specific diagnosis (Table 5.1). For example, an ECG pattern of ventricular pre-excitation can be found in storage diseases, such as those characterized by abnormalities of muscle glycogen.