During the 24-hour ECG, the patient should dress appropriately, avoid showering, swimming, security checks, etc., maintain normal daily activities and keep records to obtain accurate results. During a 24-hour ECG, electrode patches are placed on the chest and upper abdomen of the patient. These electrode patches record electrical signals from the heart, which are connected by wires to a small box that is carried with the patient, so that the electrical activity of the heart is recorded over a 24-hour period. During the 24-hour EKG test, it is best to wear comfortable, loose-fitting clothes, keep your body dry, avoid showering, swimming, sweating a lot, and avoid subway or high-speed rail security checks. During the examination, the patient can eat, drink and take medication normally, and carry on with his/her life and work as usual, and try to avoid being in a state of quietness and immobility, so that the symptoms that would have appeared under normal circumstances do not flare up, thus wasting the opportunity of this examination. During the examination, patients are required to record all symptoms, including the severity and duration of the attack, especially when symptoms such as dizziness, palpitations, fainting and dyspnea occur, so as to facilitate the doctor’s subsequent analysis. A few patients may be allergic to the electrode pads and experience localized redness and itching, which can improve on its own if it is not serious, while severe cases need to be consulted in the dermatology department.