Hepatology & GI Critical Care study guide previews.

Acute liver failure is an uncommon but high-stakes syndrome in emergency and critical care medicine. Patients can move quickly from jaundice and coagulopathy to cerebral edema, shock, multiorgan failure, and transplant-level illness. The guide frames ALF around early recognition, cause identification, organ support, and the transfer decisions that should happen before the patient deteriorates.

The preview emphasizes the physiology behind hepatic synthetic failure, impaired detoxification, systemic inflammation, cerebral edema, and circulatory collapse. It also walks through the bedside complications clinicians need to anticipate, including hypoglycemia, acidosis, infection, renal failure, bleeding risk, and neurologic decline.

Management is organized around practical ICU priorities: stabilize airway and perfusion, identify reversible causes such as acetaminophen toxicity, monitor for cerebral edema, correct metabolic derangements, avoid preventable secondary injury, and involve a liver transplant center early when ALF criteria are met.

Acute mesenteric ischemia is a vascular emergency where the gut loses adequate blood flow. Early symptoms can be subtle, but delayed recognition can lead to bowel necrosis, sepsis-like physiology, shock, perforation, and death. The guide centers on recognizing AMI before lactate and peritonitis make the diagnosis obvious.

The study guide compares arterial embolic, arterial thrombotic, venous thrombotic, and nonocclusive mesenteric ischemia. It highlights the clinical pattern of severe abdominal pain, high-risk vascular history, misleading early labs, and the importance of CT angiography as the key diagnostic test when AMI is suspected.

Initial management focuses on resuscitation, early broad-spectrum antibiotics, anticoagulation when appropriate, rapid vascular or surgical consultation, and avoiding the common pitfall of being falsely reassured by an initially normal lactate.

Cirrhotic patients in septic shock are not simply standard sepsis patients with abnormal liver tests. They often begin from a baseline state of splanchnic vasodilation, low effective arterial blood volume, immune dysfunction, renal vulnerability, ascites, edema, and fragile hemodynamics.

This guide explains why septic shock behaves differently in decompensated cirrhosis. Portal hypertension and nitric oxide-mediated vasodilation lower systemic vascular resistance, while RAAS activation, sympathetic tone, ADH release, cirrhotic cardiomyopathy, and immune dysfunction shape the response to fluids, vasopressors, infection, and organ support.

The bedside focus is practical: recognize atypical presentations, search aggressively for infection, avoid reflexive large-volume fluid strategies when congestion and ascites are present, protect renal perfusion, and escalate early when shock physiology, hepatorenal syndrome, or transplant-level illness becomes likely.

Esophageal variceal bleeding is one of the most time-sensitive emergencies in decompensated cirrhosis. The patient can look deceptively stable early, then rapidly deteriorate from hemorrhagic shock, aspiration, worsening encephalopathy, renal injury, and failure of hepatic reserve.

The guide frames variceal hemorrhage around immediate priorities: airway risk assessment, hemodynamic stabilization, balanced transfusion, early vasoactive therapy, antibiotic prophylaxis, correction of major coagulopathy when clinically relevant, and urgent endoscopic control.

It also emphasizes the physiology that makes these bleeds different from routine upper GI bleeding. Portal hypertension drives high-pressure collateral flow, cirrhosis limits compensatory reserve, and over-resuscitation can worsen portal pressures. The bedside goal is controlled stabilization while moving quickly toward definitive therapy and escalation for refractory bleeding.

Hepatic encephalopathy is not just confusion in a patient with cirrhosis. It is a neuropsychiatric manifestation of liver failure and portosystemic shunting that can range from subtle inattention to coma, aspiration risk, and ICU-level airway concerns.

The study guide focuses on recognition, grading, and the precipitating factors that matter at the bedside: GI bleeding, infection, constipation, dehydration, renal failure, electrolyte derangements, sedating medications, and progression of liver disease.

Management is organized around treating triggers while lowering gut-derived ammonia burden with lactulose and, when appropriate, rifaximin. The guide also highlights important mimics, including hypoglycemia, sepsis-associated encephalopathy, intracranial pathology, intoxication, withdrawal, and medication effects.

Lower GI bleeding can range from self-limited hematochezia to massive hemorrhage with shock physiology. The first task is deciding whether the patient is truly stable, because brisk upper GI bleeding can also present with hematochezia when transit is rapid.

The guide walks through a practical approach to localization and risk assessment. Diverticular bleeding, angiodysplasia, ischemic colitis, malignancy, post-polypectomy bleeding, inflammatory bowel disease, and anorectal sources each carry different patterns and management implications.

Initial care centers on resuscitation, medication review, anticoagulant and antiplatelet decisions, transfusion strategy, and choosing the right diagnostic pathway. Colonoscopy, CT angiography, interventional radiology, and surgical consultation all have roles depending on bleeding severity, persistence, and hemodynamic status.

Hepatorenal syndrome is one of the highest-stakes kidney emergencies in advanced liver disease. The kidneys may be structurally capable of working, but severe portal hypertension, splanchnic vasodilation, systemic inflammation, and renal vasoconstriction collapse effective renal perfusion.

The guide frames HRS as a diagnosis that must be approached carefully at the bedside. AKI in cirrhosis can also reflect sepsis, hypovolemia, GI bleeding, overdiuresis, nephrotoxins, abdominal compartment physiology, or acute tubular injury, so clinicians need to stabilize first while actively looking for reversible triggers.

Management centers on early recognition, stopping nephrotoxins and diuretics when appropriate, albumin-supported resuscitation, vasoconstrictor therapy when HRS-AKI is likely, infection control, renal replacement decisions, and timely escalation for transplant-level care.

Portopulmonary hypertension is pulmonary arterial hypertension that occurs in the setting of portal hypertension. In emergency and critical care practice, it matters because patients may present with dyspnea, syncope, hypoxemia, volume overload, chest discomfort, right ventricular failure, or shock physiology.

The guide distinguishes portopulmonary hypertension from hepatopulmonary syndrome. In hepatopulmonary syndrome, the pulmonary vessels are too dilated; in portopulmonary hypertension, the pulmonary arteries are constricted and remodeled, increasing pulmonary vascular resistance and placing the right ventricle under pressure load.

The study guide covers the diagnostic role of echocardiography and right heart catheterization, modern hemodynamic criteria, peri-intubation and procedural risk, TIPS and transplant implications, and the bedside importance of avoiding sudden increases in right ventricular afterload.

Hepatopulmonary syndrome is an important cause of hypoxemia in patients with liver disease or portal hypertension. The core problem is abnormal pulmonary vascular dilation, which creates ventilation-perfusion mismatch, diffusion limitation, and intrapulmonary shunting.

The guide helps distinguish hepatopulmonary syndrome from portopulmonary hypertension. Hepatopulmonary syndrome is primarily a vasodilated pulmonary vascular problem with hypoxemia; portopulmonary hypertension is a pulmonary arterial hypertension problem that increases right ventricular afterload.

Clinically, the guide focuses on unexplained dyspnea, platypnea, orthodeoxia, pulse oximetry changes, arterial blood gas interpretation, contrast echocardiography, and transplant implications. Supportive oxygen may help symptoms, but liver transplantation is the definitive therapy for eligible patients.

Upper and lower gastrointestinal bleeding are often discussed separately, but the first bedside question is more basic: how sick is the patient, and could the apparent source be misleading? Hematemesis strongly suggests upper GI bleeding, but hematochezia can occur with either lower GI bleeding or brisk upper GI hemorrhage.

The guide compares clinical clues, hemodynamic patterns, stool appearance, NG tube limitations, BUN-to-creatinine interpretation, medication risks, anticoagulation considerations, and the role of endoscopy, colonoscopy, CT angiography, and interventional radiology.

The emphasis is on early stabilization and correct pathway selection. A patient with melena and shock needs a different tempo than a stable patient with scant bright red blood per rectum, and a patient with cirrhosis or suspected varices requires specific therapy before endoscopy confirms the source.

Transjugular intrahepatic portosystemic shunt, or TIPS, is a portal decompression procedure that can dramatically change the physiology of advanced liver disease. By creating a low-resistance channel between the portal and hepatic venous systems, TIPS lowers portal pressure and redirects blood flow away from high-pressure varices and ascites formation.

The guide explains why TIPS is considered for complications such as refractory variceal bleeding, recurrent variceal hemorrhage, and refractory ascites, while also clarifying why it is not a benign intervention. Shunting portal blood away from the liver can worsen hepatic encephalopathy and may stress the right heart.

Bedside decision-making centers on patient selection, contraindications, MELD score, bilirubin, cardiac function, pulmonary hypertension, active infection, renal failure, and post-procedure complications. The goal is to understand TIPS as a physiologic intervention rather than just a procedural acronym.

Upper GI bleeding is a common emergency with a wide spectrum of severity. Some patients present with stable melena, while others arrive with hematemesis, syncope, shock, aspiration risk, and rapidly evolving transfusion needs.

The study guide organizes upper GI bleeding around early risk assessment, resuscitation, source prediction, and timing of endoscopy. Peptic ulcer disease, esophagitis, gastritis, Mallory-Weiss tears, malignancy, and variceal bleeding each require a different clinical frame.

Management focuses on airway assessment, IV access, restrictive but responsive transfusion strategy, proton pump inhibitor use when non-variceal bleeding is suspected, and early vasoactive therapy plus antibiotics when variceal bleeding is possible. The guide emphasizes that stabilization and source-specific therapy should begin before endoscopy provides the final answer.