Effect of pranayama (breathing exercise) on arrhythmias in the human heart.

Background: Cardiac arrhythmias, especially ventricular tachyarrhythmias are an important public health problem. QT dispersion (QTd), defined as the difference between maximal and minimal QT intervals, reflects the regional inhomogeneity of ventricular repolarization dispersion and may mark the presence of malignant ventricular arrhythmias.

Purpose: To determine the effects of Pranayama (breathing exercise) on QTd in patients with arrhythmia.