TNF and ventilator-associated pneumonia: Secondary outcome indicators include incidence of ventilator‐associated pneumonia (VAP), ICU length of stay, mechanical ventilation time, oxygenation index (OI) at 24 h (h), OI at 48 h, OI at 72 h, OI at 7 days (d), partial pressure of oxygen (PaO2) at 72 h, Acute Physiology and Chronic Health Evaluation II (APACHE II) score at 24 h, APACHE II score at 48 h, APACHE II score at 72 h, APACHE II score at 7 d, extravascular lung water indexes (EVLWI) at 72 h, TNF‐α at 24 h, TNF‐α at 7 d, IL‐6 at 24 h, IL‐6 at 48 h, IL‐6 at 72 h, and IL‐6 at 7 d.