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阵发性室上性心动过速的临床特征是突然发作和停止,心率140～220,典型发作中快速心率维持长短不一的时间后,可突然减慢约一半。血液动力学改变取决于发作原因,持续时间、室率和发作前心脏情况。心室充血不垒致心排量下降和同心率增快相一致的心肌耗氧增加,可引起心衰、心绞痛或生命脏器缺血。心电图(EKG)表现,心率140～220,房室率1:1,心率太快时 P 波落在前面 T 波上不易识辨,QRS 和 T波形态正常,发作时间过长,S-T 段可压低,T 波倒置。
The clinical characteristics of paroxysmal supraventricular tachycardia is a sudden onset and stop, heart rate 140 ~ 220, typical episodes of rapid heart rate to maintain the length of time varies suddenly can be reduced by about half. Hemodynamic changes depend on the cause of attack, duration, ventricular rate, and pre-seizure heart condition. Ventricular congestive heart failure caused by decreased cardiac output and concentric heart rate increased myocardial oxygen consumption increased, can cause heart failure, angina or organ ischemia. ECG (EKG) performance, heart rate 140 ~ 220, atrioventricular rate 1: 1, heart rate too fast when the P wave in front of the T wave is not easy to identify, QRS and T wave morphology is normal, the attack time is too long, ST segment can be depressed , T wave inversion.