Gastrointestinal & Hepatic Disorders
Key Takeaways
- Peptic ulcer disease presents as gastric ulcers (pain worsened by food) or duodenal ulcers (pain relieved by food); gastrointestinal perforation is a lethal complication marked by a rigid, board-like abdomen and severe pain.
- Liver cirrhosis results in portal hypertension, leading to life-threatening esophageal varices that require airway protection and vasoactive drugs like octreotide during active hemorrhage.
- Ascites is managed with daily weights, abdominal girth measurements, sodium restriction, spironolactone, and paracentesis after ensuring the patient empties their bladder to prevent injury.
- Hepatic encephalopathy is caused by toxic ammonia accumulation and is managed by administering lactulose titrated to produce 2 to 3 soft stools per day to excrete ammonia.
- Acute pancreatitis requires strict NPO status, nasogastric tube decompression, and aggressive fluid resuscitation; enteral tube placement must be verified by chest X-ray initially and pH testing before use.
Gastrointestinal & Hepatic Disorders
Introduction to Gastrointestinal & Hepatic Nursing
Gastrointestinal (GI) and hepatic disorders represent a broad range of conditions that alter digestion, absorption, metabolism, and elimination. The nursing care of these patients requires a comprehensive understanding of fluid and electrolyte management, nutritional support, and the early recognition of life-threatening complications. In the DHA nursing exam, candidates are expected to demonstrate proficiency in distinguishing peptic ulcer characteristics, managing the systemic complications of liver cirrhosis (such as portal hypertension and hepatic encephalopathy), recognizing the acute interventions for pancreatitis, and implementing safe enteral feeding protocols.
Peptic Ulcer Disease (PUD)
Peptic Ulcer Disease (PUD) refers to mucosal erosion in the stomach (gastric ulcer) or the duodenum (duodenal ulcer). The primary etiological factors are chronic infection with Helicobacter pylori bacteria and the prolonged use of nonsteroidal anti-inflammatory drugs (NSAIDs), which inhibit prostaglandin synthesis and compromise the protective mucosal barrier.
Gastric vs. Duodenal Ulcers
Differentiating between gastric and duodenal ulcers is a common topic in licensing exams:
- Gastric Ulcers: Pain typically occurs 1 to 2 hours after meals, is described as burning or gaseous, and is worsened by food intake. Hematemesis is more common than melena. These patients often experience weight loss due to fear of eating.
- Duodenal Ulcers: Pain occurs 2 to 5 hours after meals, often waking the patient in the middle of the night. The pain is typically relieved by food or antacids because food buffers the acid. Melena is more common than hematemesis, and patients may gain weight.
Complications of PUD
- Perforation: This is the most lethal complication. Gastric contents spill into the peritoneal cavity, causing chemical and bacterial peritonitis.
- Clinical presentation: Sudden, severe, sharp upper abdominal pain that rapidly spreads. The abdomen becomes rigid, board-like, and highly tender. Tachycardia, shallow respirations, and signs of shock develop.
- Nursing action: Maintain strict NPO, prepare for emergency surgery, insert a nasogastric (NG) tube to low intermittent suction to decompress the stomach, and administer intravenous fluids and broad-spectrum antibiotics as prescribed.
- Hemorrhage: Erosion of blood vessels. Monitor for hematemesis, melena, tachycardia, hypotension, and cold clammy skin. Nursing priorities include fluid resuscitation, blood transfusions, and preparing for endoscopic hemostasis.
Liver Cirrhosis and Complications
Cirrhosis is the end-stage of chronic liver disease, characterized by the replacement of normal liver tissue with diffuse fibrotic scar tissue, disrupting blood flow and metabolic functions.
Portal Hypertension and Esophageal Varices
Obstruction of blood flow through the liver increases portal venous pressure (portal hypertension). Collateral vessels develop, particularly in the lower esophagus, leading to thin-walled, distended veins called esophageal varices. These are prone to rupture under pressure.
- Bleeding Varices: A medical emergency.
- Nursing management: Monitor for airway patency and signs of hypovolemic shock. Administer vasoactive medications like octreotide (to cause splanchnic vasoconstriction and decrease portal pressure). Prepare for emergency endoscopic variceal ligation (banding) or sclerotherapy. Non-selective beta-blockers (e.g., propranolol) are prescribed for long-term prophylaxis against variceal bleeding.
Ascites
Ascites is the accumulation of fluid in the peritoneal cavity, driven by portal hypertension, hypoalbuminemia (impaired liver synthesis of albumin, reducing intravascular oncotic pressure), and hyperaldosteronism (the liver cannot metabolize aldosterone, leading to sodium and water retention).
- Nursing management: Monitor daily weights and measure abdominal girth at the level of the umbilicus. Place the patient in a semi-Fowler's position to ease dyspnea caused by diaphragmatic pressure. Implement a low-sodium diet and administer diuretics (usually spironolactone, a potassium-sparing aldosterone antagonist, combined with furosemide). Prepare the patient for paracentesis, ensuring they empty their bladder prior to the procedure to prevent accidental bladder perforation.
Hepatic Encephalopathy
A neuropsychiatric complication caused by the accumulation of toxic substances, primarily ammonia, which the damaged liver fails to convert to urea. Ammonia crosses the blood-brain barrier, causing cerebral edema and neurological dysfunction.
- Clinical manifestations: Altered mental status, confusion, lethargy, sleep disturbances, and asterixis (a flapping tremor of the hands when wrists are hyperextended).
- Nursing management: Administer lactulose as prescribed. Lactulose acidifies the colon, trapping ammonia as ammonium ions (which cannot be absorbed) and prompting its excretion via stool. Titrate lactulose to achieve 2 to 3 soft stools per day. Monitor electrolyte levels, perform frequent neurological checks, and maintain a safe environment to prevent injury.
Viral Hepatitis
Viral hepatitis is a systemic infection affecting the liver, categorized by different viral agents:
| Hepatitis Type | Mode of Transmission | Chronic State? | Prevention / Interventions |
|---|---|---|---|
| Hepatitis A (HAV) | Fecal-oral (contaminated food/water) | No | Hand hygiene, HAV vaccine, immunoglobulin post-exposure |
| Hepatitis B (HBV) | Blood, semen, body fluids (parenteral) | Yes | HBV vaccine series, safe sex, needle safety |
| Hepatitis C (HCV) | Blood, body fluids (parenteral) | Yes | Needle exchange programs, screening blood products, antivirals |
| Hepatitis D (HDV) | Blood, body fluids (requires HBV helper) | Yes | HBV vaccination (preventing HBV prevents HDV) |
| Hepatitis E (HEV) | Fecal-oral (contaminated water) | No | Clean drinking water, hygiene (common in developing areas) |
Acute Pancreatitis
Acute pancreatitis is an acute inflammatory process of the pancreas. The primary causes are gallstones obstructing the common bile duct and chronic alcohol abuse. The disease is characterized by the premature activation of pancreatic enzymes (trypsin, amylase, lipase) within the pancreas, causing autodigestion of the organ.
Clinical Presentation and Diagnostics
- Symptoms: Severe, sharp, deep epigastric pain that typically radiates to the back, aggravated by eating and lying supine. Nausea, vomiting, low-grade fever, and hypotension are common.
- Physical signs: Cullen's sign (bluish discoloration around the umbilicus) and Grey Turner's sign (bluish discoloration of the flanks) indicate retroperitoneal hemorrhage.
- Diagnostics: Significantly elevated serum amylase and lipase. Lipase is more specific for pancreatitis due to its longer half-life.
Nursing Interventions
- Rest the Pancreas: Maintain strict NPO status. Insert a nasogastric tube to low intermittent suction to decompress the stomach and prevent acid from stimulating pancreatic secretions.
- Fluid Resuscitation: Administer aggressive intravenous fluids (usually Lactated Ringer's) to treat hypovolemia and prevent pancreatic necrosis.
- Pain Management: Administer intravenous opioids (such as morphine or hydromorphone) around the clock or via PCA.
- Electrolyte Monitoring: Monitor for hypocalcemia (due to fat necrosis binding calcium ions). Assess for Trousseau's sign (carpopedal spasm induced by blood pressure cuff inflation) and Chvostek's sign (facial muscle twitching upon tapping the facial nerve).
Enteral Nutrition (EN)
Enteral nutrition is indicated for patients who have a functioning GI tract but cannot ingest, chew, or swallow nutrients orally. Access is achieved via nasogastric (NG), nasoduodenal, percutaneous endoscopic gastrostomy (PEG), or jejunostomy (PEJ) tubes.
Safe Nursing Care of Tube Feedings
- Verify Placement: The gold standard for verifying initial tube placement is a chest X-ray. For ongoing verification prior to each feeding or medication administration, test the pH of gastric aspirate (pH should be <= 5; a pH > 6 may indicate placement in the intestines or respiratory tract). Never rely on the auscultation method ("whoosh test") as it is unreliable.
- Prevent Aspiration: Elevate the head of the bed (HOB) to at least 30 to 45 degrees during feedings and for 30 to 60 minutes afterward.
- Monitor Gastric Residual Volume (GRV): Check GRV every 4 to 6 hours for continuous feedings, or immediately before intermittent feedings. If the residual is high (e.g., > 250 mL or based on institutional protocol), the feeding may need to be held to prevent vomiting and aspiration.
- Tube Patency: Flush the tube with 30 mL of warm water before and after feeding, before and after administering each medication, and every 4 hours during continuous feeding. Use liquid medications when available, and crush solid medications finely, dissolving them in water before administration.
A patient with a history of peptic ulcer disease presents to the emergency department reporting sudden, excruciating abdominal pain. On physical examination, the nurse notes a rigid, board-like abdomen. Which complication of peptic ulcer disease does the nurse suspect?
The nurse is preparing to administer lactulose to a patient with liver cirrhosis. Which of the following clinical indicators best demonstrates the therapeutic effectiveness of this medication?
A patient is admitted with severe epigastric pain that radiates to the back, nausea, and vomiting. The diagnosis is acute pancreatitis. Which of the following nursing interventions is a priority for this patient?