Why is alcohol used to wipe the skin when performing an electrocardiogram (ECG)?

Generally, the reasons for using alcohol to wipe the skin when performing an electrocardiogram (ECG) include enhancing conductivity, disinfection, reducing skin stickiness, minimizing interference, and improving patient comfort. The specific details are as follows:

　　1. Enhancing conductivity: Wiping the skin with alcohol can remove surface impurities such as oils and sweat, thereby maintaining good contact between the electrodes and the skin and enhancing skin conductivity. This helps the ECG machine more sensitively capture the heart's electrical activity, improving the quality of ECG detection.

　　2. Disinfectant effect: Alcohol has broad-spectrum bactericidal properties and can kill surface bacteria on the skin, reducing the risk of infection. During an ECG, wiping the skin with alcohol provides a certain degree of disinfection, protecting the patient from cross-infection.

　　3. Reducing skin stickiness: Alcohol can reduce the stickiness of the skin surface, making it easier for the electrodes to adhere to the skin and less likely to fall off. This helps ensure the smooth progress of the ECG examination and reduces the need for repeated procedures due to electrode detachment.

　　4. Minimizing interference: Wiping the skin with alcohol can reduce interference signals caused by dry skin or excessive oil. These interference signals may affect the clarity of the ECG, whereas alcohol wiping helps obtain a clearer and more accurate ECG tracing.

　　5. Improving patient comfort: After wiping the skin with alcohol, a cool sensation is produced, which can help relieve the patient's anxiety and improve comfort. During the ECG examination, the patient's relaxed state is very important for obtaining accurate results.

　　When using alcohol to wipe the skin, ensure the alcohol concentration is appropriate to avoid skin irritation caused by excessive concentration. Additionally, for patients with sensitive or damaged skin, alcohol wiping should be used cautiously to avoid exacerbating skin discomfort or causing infections.