Sinus arrhythmia is a variation in the heart's sinus rhythm, usually caused by changes in a person's breathing cycle. It's a common finding, especially in children and young adults, and its presence often declines with age. 1 Less commonly, sinus arrhythmia may indicate an underlying medical problem, like heart disease or heart block. Sinus arrhythmia is a normal variation in heart rate that occurs during breathing. Read on to learn the difference between normal and irregular sinus arrhythmia. Learn about sinus arrhythmia, a normal physiological phenomenon of irregular heart rate variation due to respiratory cycle. See ECG examples, differential diagnosis and related topics. Learn definitions, causes, criteria (ECG), clinical implications of respiratory sinus arrhythmia, sinus tachycardia and inappropriate sinus tachycardia. Includes a complete e-book, video lectures, clinical management, guidelines and much more.
