What you want to ask is what is the standard of bedside elevation for icu patients? The criteria are as follows:

1. For severe patients such as tracheotomy, ventilator-assisted breathing, coma, etc. The head of the bed is raised 30 to 45 degrees.

2. For patients with mechanical ventilation, shaking the bedside for 30-45 degrees can reduce the risk of reflux and aspiration, thus reducing the risk of lung infection.

3. Head elevation of 30 ~ 45 degrees is beneficial to venous return, which is the best head position for patients with craniocerebral injury or reducing intracranial pressure after operation.