Hepatorenal Syndrome
Hepatorenal syndrome (HRS) is a life-threatening kidney failure that occurs in advanced cirrhosis due to severe vasoconstriction of the renal arteries. It is fully reversible with liver transplantation and is a major reason for urgent listing.
6-minute patient-friendly explanation of hepatorenal syndrome
What Is Hepatorenal Syndrome?
Hepatorenal syndrome is a serious, functional kidney failure that develops in people with advanced cirrhosis and ascites. It happens when extreme widening of blood vessels in the abdomen causes the kidneys to receive too little blood flow. There is no structural damage to the kidneys — the problem is entirely due to the liver disease. HRS affects up to 40% of patients with refractory ascites over five years.
HRS Type 1 vs Type 2
Type 1 is rapid and severe — creatinine doubles in less than two weeks, often triggered by infection, bleeding, or over-diuresis. Without treatment, survival is usually only weeks. Type 2 is slower and mainly linked to diuretic-resistant ascites. It progresses gradually and has a median survival of about six months. Type 1 is the medical emergency that pushes patients to the top of the transplant list.
Diagnosis
Doctors diagnose HRS when a patient with cirrhosis and ascites has rising creatinine (>1.5 mg/dL) that does not improve after stopping diuretics and giving albumin. Other causes of kidney injury (shock, nephrotoxic drugs, infection, obstruction) must be ruled out. Urine tests show very low sodium and no protein or blood. Kidney ultrasound is normal. These strict criteria prevent confusion with other forms of acute kidney injury.
Medical Treatment (Bridge to Transplant)
Treatment aims to buy time until transplant. Terlipressin (or norepinephrine in some countries) plus albumin improves kidney blood flow in 40–50% of Type 1 cases. TIPS can help selected Type 2 patients. Dialysis is rarely a long-term solution because of complications and poor tolerance in cirrhosis. The only definitive cure is liver transplantation — the kidneys almost always recover afterward.
Transplant Priority & MELD Exception
HRS dramatically raises short-term death risk, pushing MELD scores into the high 30s or 40s. Many Type 1 patients become Status 1 or receive rapid organ offers. If kidneys do not recover quickly before surgery, doctors may consider simultaneous liver-kidney transplant (SLKT). Most centers follow strict UNOS rules to decide who needs both organs versus liver alone.
Outcomes After Liver Transplantation
After successful transplant, kidney function returns to normal in 95% of patients within 30 days and nearly 100% within six months. Five-year survival exceeds 75%, comparable to transplant recipients without HRS. Long-term risk of chronic kidney disease is slightly higher, so immunosuppression is carefully managed. SLKT is reserved for prolonged dialysis or proven irreversible kidney damage.