Relative contraindications^ include:
- Advanced age
- Advanced, untreatable malignancy
- Irreversible and incapacitating central nervous system pathology
- Immunosuppression
- Uncontrolled bleeding
- Contraindications to anticoagulation
- Severe thrombocytopenia
- Severe coagulopathy
- Receipt of invasive mechanical ventilation >7 days, especially with concomitant exposure to excessively high airway pressures or FiO2
- Limited vascular access
Are there any contraindications?