A 24-hour cardiac monitor is useful and is a very widely used monitoring tool in clinical practice, especially for critically ill and critically ill patients who routinely undergo 24-hour ECG monitoring. This monitoring helps to assess whether the patient’s condition is stable or not. It can basically tell what the patient’s current heart rate and blood pressure are, whether the current ECG waveform is stable or not, and it can identify whether the patient has arrhythmia and what type of arrhythmia it is, and it can use these indicators to basically assess whether the patient’s current state is stable or not. When uncomfortable symptoms occur, it also reduces the time wasted by going to the measurement now, and it is possible to find out in time what the current state of the patient’s heart rate and blood pressure is, so that it can be combined with medication urgently.