At present. the strategy of setting the optimal positive end-expiratory pressure (PEEP) for mechanical ventilation still needs further clinical exploration. Electrical impedance tomography (EIT) is a newly developed technology at the end of the 20th century. It can monitor pulmonary ventilation in real time. https://www.nacrack.com/hot-savings-HiBoost-Home-15K-Smart-Link-F20G-5S-IoT-limited-super/