Slow heart rate in patients with coronary artery disease: first of all, it should be considered that patients with coronary artery disease in the angina attack, if the right coronary artery close to the sinus node of the region of the coronary artery stenosis, the patient in the onset of chest tightness, anterior cardiac region of the pain, and at the same time there is slowing of the heart rate and other clinical manifestations, and some patients will also appear dizziness, sweating, fatigue and other clinical characteristics. Patients should be instructed to pay attention to rest, usually given oral medication, and if necessary, coronary artery CT or coronary angiography to clarify the diagnosis and consider the next step in the treatment plan. Secondly, consider hypothyroidism, hypothyroidism patients often appear chest tightness, slow heart rate, fear of cold and other clinical features, we should ask the patient to do the thyroid function test, at the same time to check the thyroid ultrasound to clarify the diagnosis, for the cause of the treatment.