心律失常不论病人有否心脏病变,凡心搏速率和节律发生异常者均为心律失常。一、期前收缩偶发期前收缩一般无需治疗,对频发早搏或呈二联、三联律者则需治疗。(一)房性期前收缩心电图特点为一个期前发生的 P 波,其 P—R 间期在0.12秒以上,而该 P 波形状与窦性 P 波有一定差别。一般可不做 Arrhythmia Regardless of whether a patient has a heart disease, those with abnormal heartbeat rates and rhythms are arrhythmias. First, the premature contraction Premature contraction generally do not need treatment, frequent premature beats or in two, three lawyers need treatment. (A) atrial systolic ECG before the characteristics of a P wave occurred before the P-R interval of 0.12 seconds or more, and the P-wave shape and sinus P wave have some differences. Generally do not do