Undressing is required to give CPR to a woman. 1. Exposure of the chest helps to quickly determine the presence or absence of spontaneous breathing. Before cardiopulmonary resuscitation, you need to observe whether there is a chest rise and fall to determine whether there is spontaneous breathing. Wearing clothes, especially dark-colored clothes, is not conducive to the observation of chest rise and fall, prolonging the judgment time. 2. Exposure of the chest helps to quickly determine the position of chest compressions. The position of the female nipple is relatively irregular, especially in older patients. Exposure of the chest can help to identify the compression site through the position of the midpoint of the arc of the inner edge of the breast. 3. Wearing clothing can impede electrical defibrillation and AED. Some patients may present with conditions such as ventricular fibrillation that require the patient to be treated with electrical defibrillation, an operation that requires the electrode pads to be in contact with the skin. When a female patient appears to need CPR, it means that the situation is critical and CPR needs to be performed aggressively to save the patient’s life as much as possible.