Plasma MicroRNA-21 Predicts Postoperative Pulmonary Complications in Patients Undergoing Pneumoresection

Table 1

Diagnosis of postoperative pulmonary complications.

Grade	Description
0	No pulmonary complications
1	Coughing without sputum; Microatelectasis: no other special pathological reasons; with pulmonary symptoms and body temperature > 37.5°C; chest imaging can be normal; Dyspnea: no other special pathological reasons
2	Cough and expectoration: no other special pathological reasons; Bronchospasm: newly developed asthma or asthma exacerbations need to be treated; Hypoxemia: SpO2 < 90% or PaO2 < 60 mmHg without oxygen; Atelectasis: confirmed by chest X-ray with or without abnormal pulmonary symptoms or body temperature > 37.5°C; Hypercapnia: temporary or requires treatment with medication or excessive ventilation
3	Pleural effusion: which requires drainage; Suspected pneumonia: confirmed by chest X-ray with or without bacteriological evidence; Diagnosed pneumonia: confirmed by chest X-ray and bacteriological evidence of Gram stain or culture; Pneumothorax: X-ray showed chest air and no blood vessel bed: with or without dyspnea, chest pain, irritation, cough, and other symptoms; Noninvasive mechanical ventilation or reintubation with invasive mechanical ventilation < 48 h
4	Respiratory failure: noninvasive mechanical ventilation or reintubation with invasive mechanical ventilation > 48 h

Complication grade is defined by the most severe description.