| Airway | · Endobronchial intubation · Regurgitation -> aspiration upon flattening · Oedema -> CICO at extubation | 
| Breathing | · Alveolar collapse -> ↓oxygenation · Restrictive deficit -> ↓ventilation *Exacerbated in obesity* | 
| Circulation | · ↑Venous return -> ↑CVP -> masking of intra-op blood loss · Risk of profound hypotension on return to supine | 
| Disability/neuro | · ↑ICP -> oedema -> risk narcosis and respiratory depression · ↑IOP -> risk blindness | 
| External | · Sliding off the table · Brachial plexus injury · Compartment syndrome · Rhabdomyolysis | 
Feedback welcome at ketaminenightmares@gmail.com