| Airway | · Remote · Shared · Bloody · Unsecured | 
| Breathing | ·    
  Hypoventilation -> profound hypercapnoea · Stimulation -> laryngospasm, bronchospasm · Smoke inhalation -> deterioration in lung function | 
| Circulation | · Stimulation -> ↑HR, ↑BP, arrhythmias, AMI | 
| Drugs | · Inability to deliver volatile agent · Need for short-lived immobility · Need for apnoea vs spontaneous ventilation | 
| Surgical complications | · Bleeding · Pneumothorax |