In the event of a heart attack, you should immediately call the emergency number and take first aid measures at the same time: check the airway, adjust the body position, monitor vital signs, and take medication. 1. Check the airway: Keep the airway open. If the patient has no respiratory pulse and no heartbeat, start CPR for the patient. 2. Adjust position: Keep the patient sedated and comfortable, and unbutton close-fitting clothing. If the patient loses consciousness, he should be put into a restorative position (support the patient’s head and put the patient in a prone position, bend the upper arm and knee near the rescuer’s side, and gently tilt the head back to ensure that the airway is open). 3. Monitor vital signs: Continuously monitor the patient’s respiration and pulse, and start CPR if necessary. 4. Taking medication: Many heart attack patients will have their own emergency medication with them, and the rescuer can give it to the patient in time when the patient is conscious. It is worth noting that when taking nitroglycerin tablets, the patient should be allowed to take it sublingually and sit on a sofa or a reclining chair, and taking the medicine upright may produce syncope and fall. Heart disease patients are advised to consult a specialist hospital as soon as possible to avoid delay in diagnosis and treatment.