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Introduction Acute cholecystitis and biliary colic may have signs and symptoms similar to those of Acute Coronary Syndrome(ACS) along with ischemic ECG changes. Cholecystitis and/or biliary colic have been both reported as trigger factors for bradyarrhythmia in the literature. Case Report A 78-year-old male patient was admitted to our Emergency Department (ED) due to acute abdominal pain. The ECG on admission showed sinus bradycardia with a rate of 40 beats per minute (bpm) without signs of acute ischemia and a brief period (7 s) of complete atrioventricular (AV) block. He was initially treated with analgesics. After the remission of the pain, a subsequent ECG was performed which showed sinus bradycardia of 55 bpm. The AV block terminated one hour after the patient's admission. The patient remained hemodynamically stable during the episode. He underwent an ultrasound of the abdomen in the ED which revealed sludge and one stone in the gallbladder without signs of inflammation. Laboratory test results for D-dimer and troponin were negative, while the coronary angiography showed coronary vessels without significant lesions. Conclusion Biliary colic can cause severe reversible reflex bradycardia (Cope's Sign), even complete heart block. Pain relief is very important in the management of such cases.