Gallbladder/liver lecture part 2

Gallbladder Function

  • The main function of the gallbladder is to store bile.

  • Bile is essential for the breakdown and absorption of dietary fats.

Anatomy and Terminology

  • The gallbladder is compared to a reservoir in the human body.

  • Introduction of medical terms related to gallbladder interventions:

    • Cholecystitis: Inflammation of the gallbladder, often caused by gallstones that block ducts from the gallbladder, particularly in the common bile duct.

    • Cholelithiasis: The presence of stones in the gallbladder, derived from the suffix -iasis meaning stones.

Epidemiology and Statistics

  • Gallbladder diseases affect approximately 10% of the American population; however, some believe this is an underestimate.

  • Cholecystectomy (surgical removal of the gallbladder) is one of the most common surgeries in the United States.

  • Gallstones can be very small (comparable to grains of sand) or quite large, sometimes resembling chunks of gold.

Causes and Risk Factors of Gallstones

  • Gallstones form due to an imbalance between cholesterol and bile salts, leading to the precipitation of stones.

  • Risk factors include:

    • Females over the age of 40

    • Postmenopausal women on estrogen replacement therapy

    • Use of estrogen-based oral contraceptives

    • Sedentary lifestyles and obesity

    • Strong genetic components, especially prevalent in Native American populations.

Clinical Features and Symptoms

  • Symptoms of gallstones include severe right upper quadrant pain, particularly after high-fat meals, which correlates with the gallbladder's function.

  • Other symptoms may include nausea, vomiting, fever, and jaundice, especially with obstruction of the common bile duct.

Complications

  • Stone migration to the common bile duct can lead to:

    • Pancreatitis

    • Gangrenous cholecystitis (tissue death due to lack of blood flow)

Diagnostic Procedures

  • Ultrasound: The first and most common non-invasive test used to assess gallbladder function and diagnose gallstones.

  • Endoscopic retrograde cholangiopancreatography (ERCP): Involves injecting iodine dye to visualize the common bile duct and check for stones; stenting might be performed if necessary.

  • HIDA scan: Uses a radioactive tracer to evaluate if bile is being released from the liver into the small intestine, indicating possible obstruction.

Management of Acute Cholecystitis

  • Focus on pain control and treatment of nausea and vomiting, typically using IV routes for medication delivery.

  • Maintenance of fluid and electrolyte balance, especially if the patient is NPO (nothing by mouth) due to nausea/vomiting.

  • Potentially ordered nasogastric tubes to manage gastric secretions.

  • Emphasizing respiratory hygiene to reduce the risk of pneumonia in those with significant abdominal pain due to compromised breathing.

  • Education on a low-fat diet, weight reduction, and monitoring signs of bile duct obstruction.

Surgical Interventions

  • Discuss differences between laparoscopic cholecystectomy (less invasive) and open cholecystectomy (more invasive with larger incisions).

  • Monitoring for post-operative complications includes potential respiratory issues and infection at incision sites.

T-Tube Placement

  • T-tube may be placed in the common bile duct to drain excess bile.

    • Expected drainage color is dark green to brown; purulent drainage or blood suggests infection and complications.

    • Ensure that the drainage bag is positioned correctly below the abdomen for proper bile drainage.

Introduction to the Liver

Functions of the Liver

  • The liver performs crucial functions essential for survival:

    • Production of proteins and clotting factors, like albumin, involved in regulating blood volume and pressure.

    • Excretion of bilirubin and ammonia, byproducts of red blood cell and protein metabolism, respectively.

    • Storage of vitamins (A, D, E, K) and iron.

    • Bile formation and secretion, assisting in fat digestion.

    • Metabolism of glucose, fats, and detoxifying substances such as alcohol and drugs.

Hepatitis Overview

Types of Hepatitis: A, B, C

  • Most hepatitis cases caused by viral infections but can also arise from drugs and alcohol.

  • Hepatitis A:

    • Transmitted through the oral route due to poor hygiene; vaccines recommended for children and travelers.

    • Historical cases in daycare settings; infection control is essential.

  • Hepatitis B:

    • Spread through blood and body fluids (IV drug use, unprotected sex).

    • Vaccination for all infants and high-risk groups like healthcare workers.

  • Hepatitis C:

    • Similar transmission path as Hep B, with historical risk from blood transfusions before 1992.

Symptoms of Hepatitis

  • Divided into three phases:

    • Prodromal Phase: Symptoms develop post-exposure; can include flu-like symptoms and jaundice.

    • Icteric Phase: Most contagious stage with the onset of jaundice; characterized by high bilirubin levels.

    • Symptoms include dark urine, pruritus, and jaundice from excessive breakdown of red blood cells and liver dysfunction.

Nursing Considerations for Hepatitis

  • Recommendations include:

    • Nutrition: Small frequent meals, especially high in carbohydrates and vitamins (fat-soluble vitamins A, D, E, K).

    • Alcohol cessation: Strict prohibition of alcohol intake.

    • Encourage rest, especially during prodromal and icteric stages.

    • Promote good hygiene practices to prevent spread, especially with Hep A.

    • Use of standard precautions in healthcare settings for Hep B and C, including appropriate protective equipment and needle safety practices.

Conclusion

  • Summary of topics covered: anatomy, function, surgical interventions, hepatitis A-B-C.

  • Discussion on ethical dilemmas concerning health practices, such as needle exchange programs for IV drug users, providing insights into public health and addiction issues.