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.alarecre.com/Looney-Tunes-Marvin-the-Martian-Big-Head-Galaxy-S23-Waterproof-Case-p116784/