Sinus arrhythmia can usually be done colonoscopy, when there is a heart disease need to be evaluated to be considered later. 1. Sinus arrhythmia, which occurs in most young people, is generally a normal phenomenon, and if there is no special discomfort, you can directly do a colonoscopy. 2. If the patient has heart disease and the electrocardiogram suggests sinus arrhythmia, he or she needs to be evaluated by anesthesiologists, cardiologists or gastroenterologists, and the results of the evaluation should be used to decide whether or not to perform colonoscopy, so as to avoid life-threatening situations during the colonoscopy. Although most sinus arrhythmia is normal, but also need to pay attention to rest, avoid exertion, panic, palpitations and other discomforts in time to consult the doctor.