The heart beat stops and then continues to beat consider may be premature beats, atrioventricular block and other factors. 1. Premature beats, also known as preterm contractions, are abnormal beats that occur before a normal heartbeat and are followed by a long period of inactivity. They are categorized as atrial premature beats, ventricular premature beats, and junctional premature beats. All of them produce symptoms of palpitations and cardiac arrest. 2. Atrioventricular block: This is an abnormal conduction of electrical activity from the atria to the ventricles, which prevents the heart from contracting and supplying blood normally. It is divided into one, two and three degrees of atrioventricular block, in which one degree of atrioventricular block is usually asymptomatic, two degrees will have palpitations and cardiac pause, and three degrees is more serious, and symptoms such as fatigue and fainting can occur. There are many factors that can cause cardiac arrest, it is recommended that patients do not diagnose on their own, they should go to a regular hospital, improve the relevant examination, and follow the doctor’s instructions for treatment.