Respiratory Sinus Arrhythmia: The Rhythm of Calm
Introduction and Definition of RSA Respiratory Sinus Arrhythmia, commonly abbreviated as RSA, describes the natural, routine physiological variation in the heart rate that occurs synchronously with the cycle of respiration. This phenomenon is not an irregular or pathological cardiac rhythm, as the term “arrhythmia” might traditionally suggest, but rather a standard, healthy waxing and waning […]