The heartbeat suddenly becomes heavy and slows down a few times may be the occurrence of premature beats, divided into physiological premature beats and pathologic premature beats, can be taken to adjust the work and rest, metoprolol drugs and other ways to deal with. 1. Physiological premature beats: due to fatigue, anxiety, nervousness, insomnia and other factors can cause the heart ectopic pacing point in the normal sinus node before the electrical activity issued by the excitement, causing the heartbeat to suddenly become heavier and slower for a few times, generally pay attention to adjusting work and rest, relaxation can be a natural recovery. 2. Pathological premature beats: Myocarditis, hyperthyroidism heart disease, coronary heart disease, cardiomyopathy, heart failure and other diseases are easily induced by pathological premature beats, anti-arrhythmic drugs such as metoprolol, propafenone, mexiletine, etc., and during the period of treatment, you need to follow the instructions of the doctor, and should not take the drug on your own. It is recommended to consult a doctor as soon as possible if you have repeated chest tightness and palpitations to avoid delaying your condition.