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心电图的应用不仅提高了中年人运动试验的诊断和预后价值,还增进了运动试验的安全性。偶而对于检出不宜运动而临床上并未怀疑为急性心肌梗塞的静止患者,心电图检查是必需的。心电图尚可发现具有危险的运动性心律失常,指示运动试验应予中止。例如,连续三次以上的室性早搏可能是室性心动过速和心室颤动的前奏,导致运动性心跳骤停。运动后 ST 段压低如超过规定的耐量
The application of ECG not only improves the diagnosis and prognosis of middle-aged people’s exercise test, but also improves the safety of exercise test. Occasionally, electrocardiography is required for patients who are not clinically suspected of having an acute myocardial infarction who should not exercise. Electrocardiogram can still find dangerous arrhythmia, indicating that exercise test should be suspended. For example, premature ventricular contractions of more than three consecutive episodes may be the prelude to ventricular tachycardia and ventricular fibrillation, leading to arrhythmogenic cardiac arrest. ST-segment depression after exercise such as more than the required tolerance