causes of sinus arrhythmia in adults
Sometimes it can be caused by a heart disease, but in sinus arrhythmia there is no other heart condition involved. The cause of sinus arrhythmia is said to be due to change in the vagal tone. A vagal tone is signals sent by vagus nerve that controls and regulates the heart rate. Sinus arrhythmia is seen more in children than in adults.