HaematologyTier 1Disease (DEADMAN)

Transfusion-associated circulatory overload

Description

Hydrostatic pulmonary oedema from volume overload during/after transfusion
Commonest cause of transfusion-related death in most haemovigilance data (alongside TRALI)
Key differential of acute respiratory distress during/after transfusion - vs TRALI (non-cardiogenic)

Epidemiology

Reported in up to ~1% of transfusions, likely under-recognised/under-reported
Risk factors: age extremes, pre-existing heart failure/renal impairment, large volume or rapid rate, positive fluid balance, low body weight

Aetiopathogenesis

Transfused volume + oncotic load -> acute rise in intravascular volume
Exceeds cardiac reserve -> hydrostatic pulmonary oedema
Distinct from TRALI: cardiogenic, not immune-mediated neutrophil/endothelial injury

Diagnosis

Onset during transfusion or within ~6-12h
Acute respiratory distress, hypoxia, tachycardia, hypertension (vs TRALI - often hypotension), raised JVP, bibasal creps, gallop rhythm
CXR - pulmonary oedema, cardiomegaly
BNP/NT-proBNP - elevated, rising from pre-transfusion baseline supports TACO over TRALI
Response to diuretics supports diagnosis

Management

Stop transfusion immediately
Sit patient upright, oxygen
IV diuretic (frusemide)
Supportive - NIV if required; rarely intubation
Report as a transfusion reaction (haemovigilance)

Prevention (higher-risk patients)

Transfuse one unit at a time, slower rate (e.g. over 3-4h rather than standard 2h)
Pre-emptive diuretic in patients with heart failure/renal impairment
Reassess volume status between units, avoid unnecessary transfusion (restrictive threshold)

Associations

Heart failure, CKD, low body weight, extremes of age
Large-volume/rapid transfusion (esp. plasma-rich products)
Co-occurs with other transfusion reactions - do not assume TACO is the only process

Natural history & complications

Usually resolves within 24-48h with diuresis
Significant contributor to transfusion-related mortality - recognise early
Recurrence risk high with future transfusions if risk factors not modified - flag on future transfusion orders

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