In the more critically ill elderly, they may show blurred consciousness or even loss of consciousness, and the whole body may show a state of failure, mental atrophy, and the vital signs may start to be unstable, such as blood pressure may drop, and heart rate may be unstable, sometimes showing rapid arrhythmia, gradual slowing of heart rate or sudden slowing of heart rate. Body temperature can be normal or low, but also seen at times when it is particularly high, such as a 40°C fever that is difficult to control. The patient’s pulse is often weak and difficult to palpate, and breathing is mostly sigh-like, while the ends of the limbs are cold and the skin is purple, or cyanotic, a sign of hypoxia. The patient’s physiological reflexes begin to weaken or become sluggish, and the patient may have edema in the extremities and edema in the face due to poor circulatory function.