Table 1.

Classification of etiology of acute respiratory failure

Classification	Details
Pulmonary	Upper airway obstruction, acute respiratory distress syndrome, chronic obstructuve pulmonary disease, lobar pneumonia, malignant effusion, aspergilloma, aspiration pneumonitis, lobar collapse, asthma exacerbation, noncardiogenic pulmonary edema
Cardiac	Congestive heart failure, pericarditis, primary cardiomyopathy, acute myocardial infarction, bacterial endocarditis
Neurologic	Status epilepticus, cerebral vascular accident, intracranial hemorrhage, convulsion/seizure disorder
Renal	Acute renal failure
Other	Liver failure, drug overdose, upper/lower gastrointestinal bleed, diabetic ketoacidosis, sepsis, blood transfusion reaction, vasculitis