对５０例胃镜术前、术中患者进行了心电图连续观察，结果发现：术中①窦性心动过速发生率１００％；②心律失常（室性或／和房性早搏）发生率２８％；③Ｔ波压低或倒置发生率１９％～７２％。胃镜插至咽部、食道左房段和呃逆时上述变化发生率高。这些变化均为一过性，停止胃镜检查后自行消失。提示：胃镜检查时突然心率增加或伴心律失常，心肌耗氧量势必增多，有器质性心脏病人尽量不做胃镜检查，以免诱发恶性心律失常或猝死。 50 cases of gastroscopy preoperative and postoperative patients were ECG continuous observation, the results found: intraoperative ① sinus tachycardia rate of 100%; ② arrhythmia (ventricular or / and atrial premature beats) the incidence of 28%; ③ T wave depression or inversion rate of 19% to 72%. Gastroscopy inserted into the pharynx, esophageal left atrium and hiccup when the high incidence of these changes. These changes are transient, stop disappearing after gastroscopy. Tip: gastroscopy suddenly increased heart rate or arrhythmia, myocardial oxygen consumption is bound to increase, there is no organic heart disease endoscopy, so as not to induce malignant arrhythmia or sudden death.