1. Nurse's negligence: The nurse failed to check the doctor's advice in time due to negligence or other reasons, resulting in the wrong withdrawal operation.
2. Treatment plan change: the doctor changed the patient's treatment plan or withdrawal time without informing the nurse in time, resulting in the nurse failing to follow the doctor's advice according to the actual situation.
3. Poor information transmission: Poor information transmission between doctors and nurses leads to deviation in the implementation of medical orders.