Percussion on precordial area: The performer covers the patient's precordial area with his left palm, clenches his fist with his right hand, and continuously beats his left back. Cardiac arrest is effective within 1.5 minutes. (2) Extrathoracic heart massage: The patient lies on his back with his head slightly lower and his feet slightly higher. The performer puts the left palm on the lower third of the patient's sternum, above the xiphoid process, and presses the right palm on the back of the left hand. His arm is perpendicular to the patient's sternum, and he presses hard to make the sternum sink 2-3 cm. Then he relaxed and continued to operate, 60-70 times per minute. If breathing stops, artificial respiration and tapping outside the heart should be performed alternately until the patient is sent to the hospital.

I wish you a speedy recovery.