How long you can stay on a ventilator after a brain hemorrhage depends largely on the amount of brain hemorrhage. If the amount of cerebral hemorrhage is moderate, respiratory support may be needed in the early stage, and the purpose of using respiratory support is mainly to ensure the oxygen supply of the body, so that the body does not lack oxygen. This is because respiratory dysfunction can easily occur after cerebral hemorrhage, which can easily lead to hypoxia, and hypoxia will further aggravate intracranial cerebral edema, and the use of a ventilator can improve this symptom. If the oxygenation index is greater than 300mmHg during the follow-up treatment, the ventilator can be disengaged, and the time period is usually around 2 weeks. If the amount of cerebral hemorrhage is relatively large, indicating that the patient’s condition is generally more critical, and the patient will rarely breathe on his own, the duration of ventilator use in this type of patient depends mainly on the time of cardiac arrest, generally within 3 weeks.