A 52-year-old man comes to the physician because of progressive abdominal distention and weight gain over the last 2 months. He was diagnosed with alcoholic liver cirrhosis with large ascites 1 year ago. He has congestive heart failure with a depressed ejection fraction related to his alcohol use. For the last 6 months, he has abstained from alcohol and has followed a low-sodium diet. His current medications include propranolol, spironolactone, and furosemide. His temperature is 36.7°C (98°F), pulse is 90/min, and blood pressure is 109/56 mm Hg. Physical examination shows reddening of the palms, telangiectasias on the face and trunk, and prominent blood vessels around the umbilicus. The abdomen is tense and distended; there is no abdominal tenderness. On percussion of the abdomen, there is dullness that shifts when the patient moves from the supine to the right lateral decubitus position. When the patient stretches out his arms with the wrists extended, a jerky, flapping motion of the hands is seen. Mental status examination shows a decreased attention span. Serum studies show: Sodium 136 mEq/L Creatinine 0.9 mg/dL Albumin 3.6 mg/dL Total bilirubin 1.9 mg/dL INR 1.0 Which of the following is the most appropriate next step in treatment?

Perform large-volume paracentesis

Refer for liver transplantation

Refer for peritoneovenous shunt

Change propranolol to carvedilol

Refer for transjugular intrahepatic portosystemic shunt

A 58-year-old man presents to the Emergency Department after 3 hours of intense suprapubic pain associated with inability to urinate for the past day or two. His medical history is relevant for benign prostatic hyperplasia (BPH) that has been under treatment with prazosin and tadalafil. Upon admission, he is found to have a blood pressure of 180/100 mm Hg, a pulse of 80/min, a respiratory rate of 23/min, and a temperature of 36.5°C (97.7°F). He weighs 84 kg (185.1 lb) and is 175 cm (5 ft 7 in) tall. Physical exam, he has suprapubic tenderness. A bladder scan reveals 700 ml of urine. A Foley catheter is inserted and the urine is drained. Initial laboratory tests and their follow up 8 hours after admission are shown below. Admission 8 hours after admission Serum potassium 4.2 mmol/L Serum potassium 4.0 mmol/L Serum sodium 140 mmol/L Serum sodium 142 mmol/L Serum chloride 102 mmol/L Serum chloride 110 mmol/L Serum creatinine 1.4 mg/dL Serum creatinine 1.6 mg/dL Serum blood urea nitrogen 64 mg/dL Serum blood urea nitrogen 62 mg/dL Urine output 250 mL Urine output 260 mL A senior attending suggests a consultation with Nephrology. Which of the following best justifies this suggestion?

Estimated glomerular filtration rate (eGFR)

Serum blood urea nitrogen (BUN)

A 49-year-old man presents to the emergency department with abdominal discomfort, fever, and decreased urination. He has a history of liver cirrhosis due to chronic hepatitis C infection. His blood pressure is 90/70 mm Hg, pulse is 75/min, and temperature 38°C (100.4°F). On physical examination he is jaundiced, and he has tense ascites with generalized abdominal tenderness. There is pitting edema to the level of his upper thighs. Which of the following excludes the diagnosis of hepatorenal syndrome in this patient?

Presence of 30 red cells/high powered field in the urine

A 54-year-old man with known end-stage liver disease from alcoholic cirrhosis presents to the emergency department with decreased urinary output and swelling in his lower extremities. His disease has been complicated by ascites and hepatic encephalopathy in the past. Initial laboratory studies show a creatinine of 1.73 mg/dL up from a previous value of 1.12 one month prior. There have been no new medication changes, and no recent procedures performed. A diagnostic paracentesis is performed that is negative for infection, and he is admitted to the hospital for further management and initiated on albumin. Two days later, his creatinine has risen to 2.34 and he is oliguric. Which of the following is the most definitive treatment for this patient's condition?

Transjugular intrahepatic portosystemic shunt (TIPS)

Hepatorenal syndrome for USMLE Step 2 CK: High-Yield Internal Medicine Lessons

Pathophysiology - The Kidney Squeeze

Underlying liver disease (e.g., cirrhosis) triggers a cascade that starves the kidneys of blood flow.

Portal Hypertension: The primary driver.
Splanchnic Vasodilation: Blood vessels in the gut widen, primarily due to ↑ Nitric Oxide (NO).
- This causes pooling of blood in the splanchnic circulation.
↓ Effective Arterial Volume: The rest of the body, including the kidneys, perceives a state of severe volume depletion.
Compensatory Activation: The body over-responds:
- Activation of Renin-Angiotensin-Aldosterone System (RAAS).
- Activation of the Sympathetic Nervous System.
Intense Renal Vasoconstriction: The result is a "squeeze" on the kidney's arteries, leading to ↓ renal perfusion and a sharp ↓ in GFR.

⭐ Despite profound azotemia, the kidneys in HRS are histologically normal and can function perfectly if transplanted into a person with a healthy liver.

Pathophysiology of Hepatorenal Syndrome

Diagnosis & Criteria - The Exclusion Game

Diagnosis of HRS is based on the International Club of Ascites (ICA) criteria, a process of elimination.

Prerequisites: Cirrhosis with ascites and Acute Kidney Injury (AKI).
- AKI is defined as an increase in serum creatinine (SCr) by ≥0.3 mg/dL within 48 hours OR a ≥50% increase from a stable baseline.
Exclusion Criteria (No other reason for AKI):
- No hypovolemic shock.
- No current or recent use of nephrotoxic drugs.
- No evidence of structural kidney damage (parenchymal disease):
  - Proteinuria <500 mg/day.
  - No significant hematuria (<50 RBCs/HPF).
  - Normal renal ultrasound.
Therapeutic Challenge Failure:
- No improvement in renal function after at least 2 days of diuretic withdrawal AND volume expansion with albumin (dose: 1 g/kg of body weight per day).

Hepatorenal Syndrome Diagnostic and Management Algorithm

⭐ The diagnosis of HRS is one of exclusion; you must first rule out other causes of acute kidney injury, particularly prerenal azotemia, by administering an albumin challenge.

Management - Reversing the Clamp

Primary goal: Reverse splanchnic vasodilation and renal vasoconstriction.

Pharmacologic Therapy (Bridge to Transplant)
- Albumin: Crucial for volume expansion and binding vasodilators. Give 1 g/kg on day 1, then 25-50 g/day.
- PLUS Vasoconstrictors:
  - Terlipressin: A vasopressin analog; preferred agent.
  - Midodrine + Octreotide: Alternative regimen.
Definitive & Bridging Therapy
- Liver Transplantation: The only definitive cure.
- TIPS: Can serve as a bridge to transplantation.

📌 TAM: Terlipressin/TIPS, Albumin, Midodrine+Octreotide.

⭐ Albumin is not just a volume expander here; it also binds and inactivates vasodilators and has anti-inflammatory effects, making it a critical component of HRS therapy.

Hepatorenal Syndrome Pathophysiology and Treatment

Hepatorenal syndrome (HRS) is functional renal failure that occurs in patients with advanced liver disease, particularly cirrhosis with ascites.

The primary mechanism is intense renal vasoconstriction in response to severe splanchnic and systemic vasodilation.

Common precipitants include spontaneous bacterial peritonitis (SBP), GI bleeding, and large-volume paracentesis.

It's a diagnosis of exclusion; requires no response to diuretic withdrawal and an albumin challenge.

Definitive treatment is liver transplantation; bridge therapy includes vasoconstrictors (midodrine, octreotide) and albumin.

Continue reading on Oncourse

CONTINUE READING — FREE

or get the app

App Store|Google Play