Can Liver Disease Affect Your Kidneys? Understanding Hepatorenal Syndrome

Can Liver Disease Affect Your Kidneys? Understanding Hepatorenal Syndrome

When we think about liver disease, we naturally focus on the liver. But advanced liver disease can affect almost every major organ in the body—including the kidneys.

One of the most serious complications of advanced cirrhosis is hepatorenal syndrome (HRS), a form of kidney dysfunction that occurs in people with severe liver disease, usually cirrhosis with complications such as ascites.

Hepatorenal syndrome can develop rapidly and may become life-threatening if it is not recognized and treated promptly.

The good news is that early recognition and appropriate treatment can sometimes reverse the kidney dysfunction and may provide a bridge to liver transplantation.

How Are the Liver and Kidneys Connected?

The liver and kidneys work closely together to maintain the body's internal balance.

The liver:

• Processes nutrients
• Produces important proteins
• Metabolizes medications and toxins
• Produces bile
• Regulates many metabolic processes

The kidneys:

• Filter waste products from the blood
• Regulate fluid balance
• Maintain electrolyte levels
• Help control acid-base balance
• Contribute to blood pressure regulation

When severe liver disease develops, it can dramatically change the circulation of blood throughout the body.

These circulatory changes can reduce the effective blood flow reaching the kidneys, making them increasingly vulnerable to injury.

What Is Hepatorenal Syndrome?

Hepatorenal syndrome is a specific form of kidney dysfunction associated with advanced liver disease, particularly cirrhosis and ascites.

The modern terminology recognizes several forms of hepatorenal dysfunction. One of the most clinically important is HRS-AKI—hepatorenal syndrome with acute kidney injury.

Importantly, a patient with cirrhosis and rising creatinine does not automatically have hepatorenal syndrome.

Kidney dysfunction in cirrhosis can also result from:

• Dehydration or excessive fluid loss
• Infection or sepsis
• Gastrointestinal bleeding
• Low blood pressure
• Medications that affect kidney function
• Acute tubular injury
• Pre-existing kidney disease
• Urinary obstruction, although this is less common

Therefore, doctors must carefully investigate the cause of acute kidney injury before diagnosing HRS.

Why Does Hepatorenal Syndrome Happen?

The mechanism is complex.

In advanced cirrhosis, increased pressure within the portal circulation contributes to widening of blood vessels in the abdominal circulation. This causes a reduction in the body's effective arterial blood volume even when the patient may have a large amount of fluid in the body.

The body responds as though it is experiencing low circulating blood volume.

Several compensatory systems become activated, including the:

• Sympathetic nervous system
• Renin-angiotensin-aldosterone system
• Arginine vasopressin system

These mechanisms cause the body to retain sodium and water and constrict blood vessels supplying the kidneys.

Initially, this response helps maintain blood pressure and circulation.

But when the circulatory disturbance becomes severe and persistent, kidney blood flow and filtration can deteriorate significantly.

This is one of the major mechanisms behind hepatorenal syndrome.

What Can Trigger Hepatorenal Syndrome?

HRS often develops in the setting of an additional stress or complication in a patient with advanced cirrhosis.

Important triggers include:

1. Infection

Infections—particularly spontaneous bacterial peritonitis in patients with ascites—can cause major circulatory changes and precipitate kidney dysfunction.

2. Gastrointestinal Bleeding

Significant bleeding can reduce effective circulating blood volume and place additional stress on the kidneys.

3. Excessive Fluid Loss

Dehydration, vomiting, diarrhea or excessive diuresis can contribute to acute kidney injury.

4. Certain Medications

Some medications can reduce kidney perfusion or worsen kidney function in vulnerable patients.

Non-steroidal anti-inflammatory drugs (NSAIDs), for example, can be particularly problematic in patients with cirrhosis.

5. Acute Worsening of Liver Disease

A sudden deterioration in liver function or acute-on-chronic liver failure can produce profound circulatory and inflammatory changes, increasing the risk of kidney injury.

Who Is at Risk?

Hepatorenal syndrome is primarily seen in patients with advanced or decompensated cirrhosis.

Risk is particularly increased when patients develop complications such as:

• Significant or refractory ascites
• Severe infections
• Gastrointestinal bleeding
• Low blood pressure
• Hyponatremia
• Acute worsening of liver function
• Recurrent episodes of acute kidney injury

A patient with advanced liver disease who develops a sudden increase in creatinine or reduction in urine output should be evaluated promptly.

What Symptoms Can Occur?

Kidney dysfunction may initially produce few obvious symptoms.

As kidney function deteriorates, patients may develop:

• Reduced urine output
• Increasing swelling of the legs
• Increasing abdominal swelling
• Fatigue or weakness
• Nausea or vomiting
• Breathlessness from fluid accumulation
• Increasing drowsiness
• Confusion or worsening hepatic encephalopathy

However, these symptoms can overlap with other complications of advanced liver disease.

Laboratory testing and clinical assessment are therefore essential.

How Is Hepatorenal Syndrome Diagnosed?

There is no single blood test that independently proves hepatorenal syndrome.

Doctors evaluate the patient as a whole and look for evidence of acute kidney injury while carefully excluding other causes.

Assessment may include:

• Serum creatinine and its change from baseline
• Urine output
• Blood pressure and circulation
• Electrolytes
• Liver function tests
• Fluid status
• Medication history
• Evidence of infection
• Urinalysis and urine microscopy
• Kidney imaging when appropriate

Modern diagnostic approaches focus on changes in kidney function rather than waiting for creatinine to reach an old fixed threshold. This allows clinicians to identify kidney injury earlier.

The 2024 ADQI–ICA consensus also emphasizes that HRS can coexist with other forms of kidney injury, making clinical assessment more nuanced than simply labeling every kidney problem in cirrhosis as HRS.

Why Is Early Diagnosis So Important?

HRS-AKI can progress rapidly.

Early diagnosis gives doctors an opportunity to:

• Identify and treat infections
• Correct dehydration or other precipitating factors
• Review potentially harmful medications
• Optimize fluid management
• Use appropriate albumin therapy when indicated
• Start vasoconstrictor therapy when HRS-AKI is diagnosed
• Monitor kidney function closely
• Consider renal replacement therapy when appropriate
• Evaluate the patient for liver transplantation

The goal is not simply to improve the creatinine number.

The goal is to reverse the underlying circulatory problem, protect kidney function and treat the advanced liver disease responsible for it.

Can Hepatorenal Syndrome Be Treated?

Yes. Depending on the patient's condition, treatment may include correction of precipitating factors, albumin and vasoactive medications.

Terlipressin, where available and appropriate, is an established treatment for HRS-AKI. Other vasoconstrictor strategies, including norepinephrine in appropriate intensive-care settings, may also be used.

Treatment must be individualized because these medicines can have important adverse effects and are not appropriate for every patient.

In patients with severe kidney dysfunction, renal replacement therapy (dialysis or continuous renal replacement therapy) may sometimes be required. In selected patients, it can serve as a bridge while the underlying liver disease is addressed or while awaiting transplantation.

Is Liver Transplantation the Definitive Treatment?

For suitable patients with advanced liver disease and HRS, liver transplantation is the definitive treatment for the underlying liver failure.

Medical treatment can sometimes reverse HRS-AKI and stabilize kidney function, but it does not remove the underlying cirrhosis.

Early referral to a liver transplant center is therefore important when a patient with advanced cirrhosis develops significant kidney dysfunction.

Some patients with severe and persistent liver and kidney dysfunction may also require assessment for whether simultaneous liver-kidney transplantation is appropriate.

The decision depends on the duration and severity of kidney dysfunction, the underlying kidney disease and the overall clinical picture.

Can Hepatorenal Syndrome Be Prevented?

Not every episode can be prevented, but several measures can reduce the risk of kidney injury in patients with cirrhosis.

These include:

• Prompt treatment of infections
• Avoiding unnecessary nephrotoxic medications
• Avoiding NSAIDs unless specifically advised
• Preventing excessive dehydration
• Appropriate management of ascites
• Careful use of diuretics
• Appropriate albumin replacement in selected situations
• Monitoring kidney function regularly
• Seeking medical attention early when urine output falls or the patient's condition changes

Patients with cirrhosis should never change diuretics or other medications on their own without discussing this with their treating physician.

Liver and Kidney Health: A Delicate Balance

The liver and kidneys are closely interconnected.

When advanced liver disease causes major changes in circulation, inflammation and fluid balance, the kidneys can become extremely vulnerable.

Hepatorenal syndrome is not simply “kidney failure because the liver is failing.” It is a complex clinical syndrome involving circulatory dysfunction, kidney perfusion and systemic changes associated with advanced liver disease.

The earlier it is recognized, the greater the opportunity to identify reversible triggers, stabilize kidney function and provide appropriate advanced liver care.

The Most Important Message

If you have cirrhosis and your kidney function suddenly worsens, don't assume it is just dehydration or “weak kidneys.” It needs urgent medical evaluation.

Hepatorenal syndrome can progress quickly, but appropriate treatment may improve kidney function in some patients and provide valuable time for definitive treatment of the underlying liver disease.

And in patients with advanced liver disease, timely evaluation for liver transplantation can be lifesaving.

Frequently Asked Questions

Can liver disease damage the kidneys?

Yes. Advanced cirrhosis can cause circulatory and inflammatory changes that lead to acute kidney injury, including hepatorenal syndrome.

Is hepatorenal syndrome the same as kidney disease?

No. HRS is a specific form of kidney dysfunction associated with advanced liver disease. Patients with cirrhosis can also develop dehydration-related AKI, acute tubular injury, infection-related kidney injury or independent kidney disease.

Can hepatorenal syndrome be reversed?

HRS-AKI can sometimes be reversed or significantly improved with prompt treatment, particularly when precipitating factors are identified and appropriate medical therapy is started early.

Does hepatorenal syndrome require dialysis?

Not always. Some patients respond to medical treatment. Dialysis or continuous renal replacement therapy may be needed in severe cases or for specific indications and may serve as a bridge to liver transplantation in selected patients.

Is liver transplantation a treatment for hepatorenal syndrome?

Liver transplantation treats the underlying advanced liver disease and is the definitive treatment for suitable patients with HRS.

Can hepatorenal syndrome occur suddenly?

Yes. HRS-AKI can develop rapidly, particularly after an infection, gastrointestinal bleeding, significant fluid loss or acute deterioration in liver function.

Take-Home Message

Protecting the liver can help protect the kidneys.

If you have cirrhosis, don't ignore a sudden decrease in urine output, swelling, confusion or a rise in creatinine.

Early recognition of kidney dysfunction—and determining its exact cause—can make a critical difference.

— Dr. Gursagar Singh Sahota (LiverGuru)

Liver Transplant & Hepatobiliary Surgery

Ludhiana, Punjab