Day-2 post-laparotomy multiorgan failure — score it, untangle crosstalk, sequence support

Model answer

(A) Name it with Marshall, compare the scores, state the epidemiology (4 marks). This is multiple organ dysfunction syndrome: dysfunction of two or more organs during infection, shock or trauma, framed by Buchman's gut-mediator-microvascular paradigm and Sepsis-3's dysregulated-host-response definition with a SOFA rise of 2 or more marking over 10% mortality.^[29] Score it with Marshall's six-system 24-point scale — mortality 25% at 9-12 rising to 100% above 20, AUCs 0.936/0.928, the ICU-stay delta out-explaining admission severity — while noting SOFA-2's 2025 re-thresholding of the same six systems (AUROC 0.79, gut/immune still excluded) and Denver's trauma edge (22.8% labelled but HR 3.87, specificity 81% versus SOFA sensitivity 73%).^[33][26][2] Set the stakes: a quarter of 351,942 polytrauma patients developed MOF across 40 competing definitions with no fall over time — and his day-2 AKI is Wohlauer's canary (2.13% incidence, 78% MOF, 27% death, beating early heart/lung/liver failure as predictor).^[1][14]

(B) Run the crosstalk and coagulation decisions (3 marks). Treat kidney and lung as one bidirectional organ: AKI injures lung even without fluid gain while hypoxaemia, hypercapnia and ventilation injure kidney — so optimise fluids, prevent inflammation and lung stretch now, with his IL-6/TNF-alpha systemic inflammation driving endothelium and immunity across all systems.^[12][10] Score SIC today (platelets, PT, organ score): 98.7% of overt DIC is already SIC-positive and SIC predicts death with 86.8% versus 64.5% sensitivity — but withhold anticoagulation without DIC, since benefit exists only in DIC (thrombomodulin only in high-severity DIC) and unselected therapy bleeds without survival gain.^[18][20]

(C) Sequence support and counsel the year (3 marks). Give hydrocortisone-plus-fludrocortisone for the shock component (90-day death 43.0% versus 49.1%, RR 0.88, organ-failure-free days 14 versus 12); give no bicarbonate for mortality (62.1% versus 61.7% null, though KRT 35% versus 50%), no vitamin C (harm: 44.5% versus 38.5%, RR 1.21), and use PCT only to stop antibiotics early (2.0 days saved, mortality RR 0.95) — not to diagnose.^[23][24][60] Counsel with Inghammar's tail (56% versus 26% dead; hazard 3.0 at 2-12 months, 1.6 beyond 5 years) and book serial PICS screening from 2-4 weeks (MoCA, HADS, IES-R, walk, EQ-5D) because no tool predicts it reliably.^[61][67]