ICU · Renal

Fluid overload management in ICU: comprehensive

Also known as Fluid overload · Positive fluid balance · De-resuscitation · ROSE model fluid therapy · Fluid accumulation syndrome · Global Increased Permeability Syndrome

Fluid overload is one of the most common and most dangerous iatrogenic complications in the ICU. A positive cumulative fluid balance is an independent predictor of mortality, AKI, ARDS, prolonged mechanical ventilation, and increased ICU length of stay. The ROSE model conceptualises fluid therapy in four phases — Rescue (salvage boluses for life-threatening shock), Optimisation (goal-directed titration using dynamic indices), Stabilisation (zero or slightly negative balance, organ support only), and De-escalation/Evacuation (active fluid removal or de-resuscitation with diuretics or CRRT). Key evidence: the SOAP study (Vincent 2006) demonstrated that positive fluid balance is an independent predictor of ICU mortality in sepsis. The FACTT trial (ARDSNet 2006) showed that a conservative fluid strategy in ALI/ARDS increased ventilator-free days and reduced ICU stay without increasing non-pulmonary organ failure. The CLASSIC trial (Meyhoff 2022, NEJM) found that a restrictive fluid strategy in septic shock was safe and showed signals toward benefit in pre-specified subgroups. Cordemans 2012 described Global Increased Permeability Syndrome (GIPS) — the 'third hit' of critical illness where capillary leak, endothelial dysfunction, and ongoing inflammation make fluid accumulation self-perpetuating. Management requires phase-appropriate fluid stewardship: give fluid only to responsive patients (passive leg raise, pulse pressure variation, IVC collapsibility), track cumulative balance daily (cumulative 10% body weight = significant overload), and de-resuscitate aggressively once shock resolves (furosemide IV bolus or infusion, thiazide for sequential nephron blockade, albumin 20% for oncotic pressure, CRRT for refractory overload). The FEAST trial (Maitland 2011) remains a cautionary landmark: fluid boluses INCREASED mortality in African children with severe infection, demonstrating that fluid is not always benign.