Coronary blood flow regulation factors mainly include several aspects: first, effective blood pressure, effective blood pressure is the prerequisite for effective perfusion of coronary arteries, when there is shock, dehydration and other factors that cause blood pressure to drop, coronary blood flow may drop, so too low blood pressure affects coronary blood flow. Second, heart rate, coronary blood flow mainly occurs in the diastolic phase of the heart, when the heart rate increases the systolic phase of the heart is prolonged, the diastolic phase is shortened, so that the coronary perfusion will be reduced, so it must be controlled to the appropriate heart rate to ensure coronary blood flow. Third, the inner diameter of the coronary vessels, the inner diameter of the coronary vessels is the main vascular resistance to form the blood supply to the coronary arteries, the general blood flow of the coronary arteries is proportional to the fourth power of the radius of the coronary vessels, so as long as the coronary arteries are properly dilated, the blood flow of the coronary arteries will have a substantial increase, reaching as many as several times the usual.