Some people often feel their heart suddenly stopping for a while” or their heart suddenly pounding against their chest”, or even feel their heart suddenly beating into their throat”. What is the reason for this? It turns out that this is a premature beat. We know that a normal human heart contraction is rhythmic and there is an interval between contractions. Suppose a person’s heart beats 80 times a minute, then there is an interval of 0.75 seconds between contractions. The sinus node generally governs the rhythm of the heart, but the atria or ventricles can also generate their own excitation to cause the heart to contract. If, during the short interval after a heart contraction, the atria or ventricles are affected by neurological or humoral factors and pathological damage such as myocarditis, they send out an excitation prematurely on their own, so that the heart contracts early before the next excitation from the sinus node, this is called a “preterm contraction” or premature beat, which we all prefer to call This is called preterm contraction or premature beat, which is also known as premature beat. When you are concentrating on your work, a sudden ringing sound may startle you, or when you are just falling asleep, a sudden re-beating from your heart may wake you up from your sleep. However, the perception of premature beats also varies from person to person. Some people do not feel anything despite having many beats per minute, while others experience the above mentioned discomfort with every beat. The reason why premature beats can cause these symptoms is also simple. When the heart is beating methodically, people are used to it and generally do not feel it beating”. However, if the heart beats early once, and there is usually a long interval after this early beat, people feel that the heart is beating unevenly, and some people even feel that the heart has stopped beating once. In addition. When the heart is in rhythm, the amount of blood expelled by the heart is the same for each contraction. However, when a premature beat occurs, the heart is not fully filled with blood, so the amount of blood discharged during contraction is less, while the next contraction is after a longer interval, when the heart is filled with more blood and the amount of blood discharged during contraction is also more, so the heart contraction must be stronger, and more sensitive people will have abnormal sensations such as heart pounding. If premature beats occur once in a while in normal heart rhythm, it is called episodic premature beats; if premature beats occur every second normal beat, it is named duplex and triplet rhythm respectively. There are many different types of premature beats when observed with the help of electrocardiogram. There are atrial premature beats, atrioventricular junctional and ventricular premature beats. Ventricular premature beats are the most frequent, accounting for 70% of premature beats, atrial premature beats are the second most frequent, accounting for 2% of premature beats, and about 10% of premature beats are atrioventricular junctional beats.