Stress during ECG measurement can have an effect. If the patient’s heart rate is accelerated and the heart rate is still in the range of 60-100 beats per minute, it is normal and will not affect the ECG. If the patient’s heart rate is greater than 100 beats/min, the patient may be suffering from invisible heart disease or sinus tachycardia symptoms, which will have an effect on the ECG. The heart beats faster and tachycardia caused by nervousness is a normal physiological phenomenon, and the patient will not be affected if the ECG test is performed after calming down.