Categorization of causes of prolonged hospitalization
| Causes |
| Pneumonia-related |
| Fever (>37.5 °C) |
| Blood pressure |
| systolic<100 mmHg or diastolic<60 mmHg |
| Hyponatraemia <130 mmol·L−1 |
| Hypernatraemia>155 mol·L−1 |
| Respiratory failure |
| room air Pa,O2<60 mmHg |
| Arterial blood saturation <90% |
| Respiratory acidosis pH ≤7.30 |
| Acute changes in mentation |
| Metastatic infection |
| Complications |
| Respiratory |
| Metapneumonic pleural effusion |
| Empyema requiring thoracocentesis and/or drainage |
| thromboembolism |
| haemoptysis |
| Cardiovascular |
| Acute myocardial infarction |
| worsening chronic or new congestive heart failure |
| Hypertensive crisis |
| Ventricular fibrillation or tachycardia |
| New or unstable atrial flutter or fibrillation |
| Supraventricular tachycardia |
| Hepatic |
| Gastrointestinal |
| Bleeding |
| Diarrhea |
| Vomiting |
| Others |
| Unstable comorbid disease |
| Nonclinical reasons |
| ‘Weekend effect’ |
| Delay in radiographical results |
| Delay in laboratory results |
| Need for supportative care |
| Others |
Pa,O2: arterial oxygen tension