Day-2 post-laparotomy desaturation with basal collapse, transfused overnight and an epidural running — split the forks, defend the ventilation, rescue with evidence

Model answer

(A) Five forks, ARISCAT risk, TRALI-versus-overload split (4 marks). Name atelectasis/splinting, aspiration, transfusion injury, ARDS and simple hypoxaemia — the ARISCAT composite counts respiratory infection, respiratory failure, bronchospasm, atelectasis, pleural effusion, pneumothorax and aspiration pneumonitis as one family.^[2] She carries at least four of the seven ARISCAT factors outright (low saturation, upper abdominal surgery, long operation, emergency listing — verify age, anaemia and recent chest infection from her record) against a derivation event rate of 5 percent with 30-day death 19.5 versus 0.5 percent — and the emergency-laparotomy cohort puts her lane at 39.9 percent PPC with 21.0 percent death.^[2] For the overnight FFP, split permeability from overload: low-risk donor strategies cut TRALI onset (OR 0.61, 0.51 in prone populations), and male-only FFP protected against post-transfusion distress (OR 0.219) while bypass and liver dysfunction predicted it — examine for congestive versus permeability patterns and review the product antibody history before diuresing or restricting.^[34][35]

(B) Low stretch with low PEEP, sugammadex, never waiting (3 marks). Her operation should have been ventilated at low tidal volumes with low PEEP and no routine recruitment: PROVHILO (900 patients, 8 mL/kg) found PPC 40 versus 39 percent (RR 1.01) with more hypotension on high PEEP 12 with recruitment.^[5] The mechanism is driving pressure — OR 1.16 per unit, the only mediator of protective-ventilation benefit — so PEEP that raises driving pressure harms (OR 3.11).^[8] Reverse with sugammadex: SNaPP (3498 patients) showed PPC-or-death 19.0 versus 21.5 percent (RR 0.88) via atelectasis — and never let the block wear off, because pharmacological reversal protected (OR 0.62) making spontaneous recovery the risk factor.^[17]

(C) Treat failure with NIV, keep the epidural, retire prophylaxis and the talisman (3 marks). Do not order routine CPAP: PRISM (4793 patients) showed pneumonia, reintubation or death 8.1 versus 8.2 percent — prophylaxis not recommended, treatment role kept — and early preventive HFNC changed nothing either (OPERA, 220 patients).^[26][27] Start NIV now that she has established failure: Jaber (293 post-abdominal patients) cut reintubation 33.1 versus 45.5 percent with fewer infections.^[29] Keep the epidural: MASTER cut respiratory failure 23 versus 30 percent as its sole winning endpoint with better pain and no major catheter harm — analgesia defeats splinting.^[23] Do not prescribe incentive spirometry alone: two RCTs (224 bariatric, 387 lung-resection patients) were negative — order the mobilisation and physiotherapy bundle instead.^[32]