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正常窦性 P 波正常心电图中心动周期第一波叫 P 波,呈园丘状,顶端园钝光滑,是由窦房结发出冲动引起心房除极所产生的,故又称窦性 P 波。P 波正常极性是Ⅰ、Ⅱ、Ⅴs 导联一定正相,aVR 导联一定负相;时间0.06～0.11秒;振幅<2.5毫米。P 波的前半部约0.01秒,以右房除极为主;后半部约0.025秒,以左房除极为主;中间约0.04秒,系左右心房共同除极为主;两房激动结束,平均约0.075秒.由于两房除极存在先后,有些 P 波顶端显示两个小峰,表明两房激动的界限,此两峰间距正常<0.03秒.当房率增快时,两房除极的时间差值缩小,同步除极程度趋向一致,P 波顶端双峰可消失.一般 P 波振幅过低(<0.05毫米)或某些导联 P 波平坦甚至倒置,与 P 电轴有关,没有特殊临床意义.粘液性水肿,心包积液偶可出现 P 波低电压,此与电流传导
Normal sinus P wave normal ECG center of the first wave of mobile cycle called P wave, was park-like, the top of the park blunt smooth, is caused by the sinus node impulse caused by atrial depolarization generated, it is also known as sinus P wave. P wave normal polarity is Ⅰ, Ⅱ, Ⅴs lead must be positive, aVR lead must be negative; time 0.06 ~ 0.11 seconds; amplitude <2.5 mm. P wave of the first half of about 0.01 seconds to the right atrial depolarization; the second half of about 0.025 seconds to the left atrial depolarization mainly; about 0.04 seconds in the middle of the left and right atrium common depolarization; the end of the two rooms excited, the average about 0.075 seconds .Because of the existence of two rooms in addition to the pole, some of the top of the P wave shows two small peaks, indicating the two rooms excited boundaries, the normal spacing of <0.03 seconds .When the room rate increases, the difference between the two rooms depolarization Value is reduced, the degree of synchronization depolarization tend to coincide, the double peak at the top of P wave can disappear.Generally, P wave amplitude is too low (<0.05 mm) or some lead P wave is flat or even inverted, with P axis, there is no special clinical significance Mucous edema, pericardial effusion may even occur P wave low voltage, which conduction with the current