Sinus arrhythmia: Is when your heart beats

Sinus arrhythmia is when your heart beats too slowly or too fast. The change of pace may happen when you breathe. This condition is common and usually benign. But, it could indicate an... 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. 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 variation in normal sinus rhythm that affects the heart rate and rhythm. It is usually harmless, but may indicate other heart problems. Learn about the causes, symptoms, types, diagnosis, and complications of sinus arrhythmia.