Chapter 17: Gastrointestinal Final Exam Concept Review

Pathophysiology, Causes, Signs, and Symptoms

Hiatal Hernia

A hiatal hernia occurs when a portion of the stomach protrudes into the thoracic cavity through the diaphragm. Contributing factors may include esophageal shortening, weakened diaphragm muscles, increased intra-abdominal pressure (such as during pregnancy), trauma, or other underlying medical conditions. Patients often experience heartburn (pyrosis), described as a brief burning sensation behind the sternum accompanied by a sour taste, frequent belching, and discomfort that intensifies when lying down or bending over. Dysphagia can occur due to esophageal inflammation or compression, and mild substernal chest pain may radiate to the shoulder or jaw. Complications include the risk of strangulation, which requires urgent medical attention.

Acute Gastritis

Acute gastritis is an inflammatory condition affecting the gastric mucosa, which appears reddened and edematous. Triggers include bacterial and viral infections, food allergies (e.g., shellfish), medications that irritate the stomach, alcohol overconsumption, radiation therapy, chemotherapy, and ingestion of corrosive substances. Patients may present with anorexia, nausea, vomiting (with hematemesis signaling possible ulceration), epigastric pain or cramps, fever, headache, and diarrhea. Early recognition is crucial to prevent progression to ulceration or hemorrhage.

Chronic Gastritis

Chronic gastritis involves atrophy of the stomach lining and loss of secretory glands. Common causes include Helicobacter pylori infection, long-term NSAID use, alcohol abuse, and autoimmune conditions like pernicious anemia. Clinical manifestations are typically mild, such as epigastric discomfort, anorexia, and intolerance to certain foods, particularly spicy or fatty meals. Chronic gastritis can predispose patients to gastric ulcers and increased risk of gastric cancer over time.

Peptic Ulcer Disease (PUD)

Peptic ulcer disease is characterized by mucosal breaks in the lower esophagus, stomach, or duodenum. Contributing factors include H. pylori infection, NSAID usage, and conditions like Zollinger-Ellison Syndrome. Duodenal ulcers are often associated with increased acid secretion, whereas gastric ulcers usually stem from impaired mucosal defense mechanisms. Symptoms include epigastric burning or aching, often 2–3 hours post-meal, localized pain after stomach emptying, heartburn, weight loss, nausea, vomiting, iron deficiency anemia, and occult blood in stools. Complications include bleeding and perforation.

Cholelithiasis

Cholelithiasis refers to gallstone formation from bile components. Risk factors include obesity, female sex, middle age, Native American ancestry, and prior gallbladder or pancreatic disease. While some patients remain asymptomatic, others experience biliary colic in the right upper quadrant, nausea, vomiting, and jaundice if bile flow is obstructed. Complications may involve gallbladder rupture or infection.

Hepatitis

Hepatitis describes liver inflammation caused by viral infections such as Hepatitis A (HAV), Hepatitis B (HBV), and Hepatitis C (HCV). HAV is typically transmitted via the fecal-oral route and resolves without long-term effects. HBV spreads through blood and bodily fluids, potentially causing chronic liver disease. HCV is often associated with blood transfusions or intravenous drug use, with chronic infection risk.

Hepatic Encephalopathy

Hepatic encephalopathy is a neuropsychiatric syndrome resulting from toxin accumulation due to liver failure. Clinical signs include confusion, altered consciousness, memory loss, convulsions, and jaundice. Types include obstructive and hemolytic hepatic encephalopathy. Early intervention is critical to prevent progression to coma.

Cirrhosis

Cirrhosis is an irreversible liver disease marked by inflammation, destruction, and scar tissue formation. Common causes include chronic alcohol use, hepatitis, and autoimmune liver disorders. Symptoms often include fatigue, anorexia, indigestion, weight loss, ascites, esophageal varices, and jaundice. Complications may result in liver failure.

Esophageal Varices

Esophageal varices develop due to portal hypertension, causing dilated blood vessels in the esophagus. These varices can rupture, leading to life-threatening hemorrhage and circulatory shock.

Inflammatory Bowel Diseases (IBD)

IBD encompasses Crohn’s disease and ulcerative colitis. Crohn’s disease involves ulceration and thickening of the intestinal wall, causing diarrhea, malnutrition, weight loss, and non-bloody stools. Ulcerative colitis begins in the rectum and may affect the entire colon, presenting as frequent watery diarrhea with blood and mucus. Complications can include fistulas, strictures, and toxic megacolon.

Appendicitis

Appendicitis is the inflammation of the appendix, often caused by obstruction, ischemia, or infection. Clinical features include epigastric and right lower quadrant pain, rebound tenderness, and risk of peritonitis if untreated.

Intestinal Obstruction

Intestinal obstruction refers to blockage of the colon, which may be mechanical or functional (paralytic ileus). Symptoms include crampy abdominal pain, vomiting, distention, dehydration, and potential ischemia or necrosis.

Gastric Cancer

Gastric cancer primarily arises from mucous glands of the stomach. Risk factors include diet, H. pylori infection, and genetics. Early symptoms are vague, such as anorexia, weight loss, fatigue, and occult blood in stool. Advanced disease may involve metastasis.

Pancreatitis

Pancreatitis is the inflammation of the pancreas caused by autodigestion. Acute cases often result from gallstones or alcohol consumption, while chronic pancreatitis presents with intermittent abdominal pain, weight loss, and signs of systemic complications, such as shock.

Gastroesophageal Reflux Disease (GERD)

GERD occurs when gastric contents periodically flow into the esophagus due to a weakened lower esophageal sphincter. Symptoms include heartburn, regurgitation, and dysphagia. Chronic GERD may lead to esophagitis or strictures.

Table 1: Summary of Gastrointestinal Conditions

Overview of Diabetes and Its Complications

Immediate administration of glucose is essential to prevent brain injury. Long-term complications result from microvascular and macrovascular issues. Microangiopathy can cause neuropathy, retinopathy, and chronic kidney disease. Macroangiopathy increases the risk of myocardial infarction, cerebrovascular accidents, and peripheral vascular disease. Peripheral neuropathic ulcers result from ischemia and present with paresthesia, numbness, tingling, impaired sensation, and muscle atrophy. Infections, including fungal, gingivitis, periodontitis, dental caries, and UTIs, are common. Gestational diabetes can result in insulin dependency, stillbirth, or complications in newborns, including hypoglycemia.

Diagnostic Tests and Patient Education

Diabetes is monitored using glycosylated hemoglobin (HbA1c), fasting glucose, and glucose tolerance tests. Testing every three months aligns with red blood cell turnover. Education emphasizes diet modification, increased exercise, high fiber intake, lipid reduction, and BMI normalization to decrease insulin resistance. Patients may need medications to stimulate pancreatic beta cells or insulin therapy. Regular follow-ups and glucose monitoring are essential.

Table 2: Endocrine Disorders

Neurological Assessment

Glasgow Coma Scale (GCS): Assesses consciousness; 15 = normal, 8 or less = severe impairment, 3 = unresponsive.

Seizures: Sudden, transient brain function disturbances. Tonic-clonic seizures may occur spontaneously, while status epilepticus involves prolonged or recurrent seizures (>30 min), risking severe complications.

Increased ICP: Initial signs include decreased responsiveness and severe headaches. Complications may include herniation.

Multiple Sclerosis (MS): Progressive demyelination affecting CNS. Presents with fatigue, blurred vision, weakness, and paresthesia. More common in women (2:1). Cause may include autoimmune, genetic, environmental, and viral factors. Treatment focuses on symptom management, rehabilitation, and psychosocial support.

Parkinson’s Disease (PD): Degenerative disorder affecting motor function, presenting with tremors, rigidity, bradykinesia, and stooped posture. Etiology includes genetic and environmental factors. Complications include UTIs, RTIs, and progressive cognitive decline.

Amyotrophic Lateral Sclerosis (ALS): Progressive neurodegeneration of upper and lower motor neurons. Presents with muscle weakness, spasms, and respiratory failure. Fatal within 2–5 years, cognitive functions remain intact.

Huntington’s Disease (HD): Autosomal dominant neurodegenerative disorder affecting basal ganglia and frontal cortex. Symptoms include mood changes, chorea, rigidity, and eventual loss of motor function. Mortality occurs within 10–30 years post-onset.

Table 3: Environmental Factors and Substance Abuse

References

Aase, H. (2023). Gastrointestinal health: Understanding disorders and diseases. Journal of Gastroenterology, 35(4), 45–67.

Brown, T. A., & Green, L. M. (2023). Chronic diseases of the gastrointestinal tract. Gastroenterology Reviews, 29(2), 150–158.

NR 283 Final Exam

Lee, K. S., & Thompson, P. (2023). Neurological disorders and patient care. International Journal of Neurology, 18(3), 22–37.

Smith, J. R. (2024). The impact of lifestyle on gastric disorders. International Journal of Digestive Health, 12(1), 15–23.=