Sinus bradycardia patients if the condition is stable without complications can, if the condition is serious with chest tightness, breathlessness, there is obvious heart failure performance, etc. can not. 1. Sinus bradycardia patients, if the condition is not serious, the patient does not have obvious panic, chest tightness, no cardiac insufficiency, no other serious organic lesions, you can do painless colonoscopy. 2. Sinus bradycardia patients, if the condition is more serious, accompanied by chest tightness, breathlessness, obvious cardiac failure manifestations, or at the same time accompanied by other serious heart, lung, brain and other diseases, can not be painless colonoscopy. Painless colonoscopy is likely to cause exacerbation of the condition, causing life-threatening. It is recommended to carry out the examination under the guidance of professional physicians to avoid causing damage.