AKI and renal drug dosing

Hepatorenal and cardiorenal syndromes

Reviewed Nov 2026·5 references
New· views rounded down, updated weekly

Diagnose HRS-AKI by ICA-ADQI 2024 criteria and treat with terlipressin and albumin; manage cardiorenal syndrome by decongestion.

Definition
HRS-AKI = AKI in cirrhosis with ascites, no response after 48 h of diuretic withdrawal and albumin 1 g/kg, no shock, no current nephrotoxins, no signs of structural kidney injury. Cardiorenal syndrome = bidirectional heart-kidney dysfunction; type 1 = acute heart failure causing AKI, often driven by venous congestion.

At the bedside

Timed steps
  1. 1

    Cirrhosis with AKI: first steps

    Day 0-2

    Stop diuretics, NSAIDs, beta-blockers if hypotensive, nephrotoxins; treat infection (SBP: diagnostic tap), bleeding, hypovolaemia (albumin 1 g/kg/day, max 100 g, for 2 days).

  2. 2

    Diagnose HRS-AKI

    If AKI persists (stage ≥ 1B or progressing) without shock and urine sediment is bland (protein < 500 mg/day, < 50 RBC/hpf, normal ultrasound): HRS-AKI.

  3. 3

    Treat HRS-AKI

    Terlipressin (bolus 0.5-1 mg q4-6h or infusion 2 mg/day, up-titrate to max 12 mg/day) + albumin 20-40 g/day. Noradrenaline infusion is an alternative in ICU (central line). Midodrine + octreotide is less effective.

  4. 4

    Monitor for harm

    Daily SpO2, chest exam, fluid status: terlipressin + albumin can cause pulmonary oedema and respiratory failure. Stop if SpO2 < 90%; avoid in ACLF grade 3 or creatinine ≥ 5 mg/dL.

  5. 5

    Response and transplant

    Response = creatinine fall to < 0.3 mg/dL above baseline. Refer all HRS for liver transplant assessment; RRT as bridge if transplant candidate.

  6. 6

    Cardiorenal: decongest

    Loop diuretic IV at 1-2.5x oral dose; check spot urine Na at 2 h (< 50-70 mmol/L = inadequate) and UO at 6 h (< 100-150 mL/h): double dose, add thiazide/acetazolamide. A modest creatinine rise during effective decongestion is acceptable.

  7. 7

    Refractory cardiorenal

    Inotrope if low output; ultrafiltration/RRT for diuretic-resistant congestion.

HRS-AKI vasoconstrictor

Terlipressin

IV bolus or infusion
Dose
0.5-1 mg q4-6h, or 2 mg/24 h infusion; max 12 mg/day
Range
2–12 mg/day
Preparation
2 mg in 50 mL NS over 24 h = ~2 mL/h
Worked example
Start 2 mg/24 h infusion; creatinine fall < 25% at 48 h → increase to 4 mg/24 h

Infusion has fewer ischaemic side effects than boluses.

Volume expansion / HRS treatment

Human albumin 20%

IV
Dose
Day 1-2: 1 g/kg/day (max 100 g); with terlipressin 20-40 g/day
Worked example
70 kg: 70 g = 350 mL of 20% albumin on day 1

Decongestion in cardiorenal

Furosemide

IV
Dose
1-2.5x total daily oral dose as bolus; repeat/double at 6 h if poor response
Worked example
On oral furosemide 40 mg BD (80 mg/day): give 80-200 mg IV; urine Na at 2 h < 50 mmol/L → double dose
Red flag · call your senior now
New hypoxaemia or crackles on terlipressin + albumin: stop albumin, consider stopping terlipressin, diurese.
Red flag
AKI in cirrhosis with fever or abdominal pain: diagnostic paracentesis for SBP immediately.
Pitfall
Continuing diuretics and lactulose-induced diarrhoea while creatinine rises in cirrhosis.
Pitfall
Stopping diuretics in cardiorenal syndrome because creatinine rises while the patient is still congested.
Pearl
Creatinine overestimates GFR in cirrhosis (low muscle mass); a 'normal' creatinine of 1.0 mg/dL may be significant kidney dysfunction.

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