Among patients with SQTS, the atrial and ventricular refractory periods are<unk> ened (ranging from 120 to 180 ms).  Ventricular fibrillation can be induced on programmed stimulation in 90% of patients with<unk> <unk>  syndrome.  Despite the high rate of VF inducibility, the risk of sudden death in an individual patient is difficult to predict given the genetic and clinical heterogeneity of<unk> <unk>  syndrome and the limited number of patients with<unk>  follow-up to date.  The limitations of electrophysiologic testing are highlighted by a study of Giustetto et al in which the sensitivity of electrophysiologic testing in relation to the clinical occurrence of ventricular fibrillation was only 50% (3 of 6 cases).  Importantly, lack of inducibility does not exclude a future episode of ventricular fibrillation.  Thus, the role of electrophysiologic testing in risk stratification of the patient with SQTS is not clear at present.
Short QT syndrome electrophysiologic studies
Brugada syndrome electrophysiologic studies
Adams-Stokes syndrome electrocardiogram
Bartter syndrome electrocardiogram
Haff disease electrocardiogram
Premature atrial contraction laboratory studies
Cardiomyopathy electrocardiogram
Status asthmaticus electrocardiogram