13B. Pancreatic Disorders
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Questions and Answers

Which cells are primarily responsible for digestive enzyme production in the pancreas?

  • Enteroendocrine cells
  • Centroacinar cells
  • Acinar cells (correct)
  • Islet cells
  • What is a primary function of the pancreatic ducts?

  • Insulin secretion
  • Glucagon secretion
  • Somatostatin secretion
  • Bicarbonate secretion (correct)
  • What is the approximate pH of pancreatic juice?

  • 8.0-8.3 (correct)
  • 7.0-7.5
  • 9.0-9.5
  • 6.0-6.5
  • Which of the following is NOT considered an inhibitor of pancreatic exocrine secretion?

    <p>Insulin (A)</p> Signup and view all the answers

    According to the Atlanta Diagnostic Criteria, what is one crucial indicator of acute pancreatitis?

    <p>A threefold increase in serum lipase (C)</p> Signup and view all the answers

    What is a common symptom in patients suffering with acute pancreatitis?

    <p>Belt-type pain radiating to the back (B)</p> Signup and view all the answers

    Which of the following is considered a risk factor for chronic pancreatitis?

    <p>Alcohol use (D)</p> Signup and view all the answers

    According to the provided text, what can result from the obstruction of the pancreatic duct?

    <p>Increased intraductal pressure (B)</p> Signup and view all the answers

    What is a consequence of alcohol metabolism in acinar cells that can destabilize cellular membranes?

    <p>Formation of fatty acid ethyl esters (B)</p> Signup and view all the answers

    A high daily alcohol intake is identified as high drinker, according to the text. How is this quantity defined?

    <p>Consuming &gt; 40 g/d for over 5 years (D)</p> Signup and view all the answers

    What is the effect of obesity on insulin levels that can contribute to endoplasmic reticulum (ER) stress?

    <p>Increased insulin resistance and hyperinsulinemia (C)</p> Signup and view all the answers

    What is the increased risk of acute pancreatitis with at least 20 pack years of smoking?

    <p>2-fold increase (D)</p> Signup and view all the answers

    What is the initial physiological event in the evolution of acute pancreatitis, as described in the text?

    <p>Pancreatic acinar cell damage (D)</p> Signup and view all the answers

    What is a common physical sign associated with acute pancreatitis due to hemorrhage?

    <p>Cullen's sign (C)</p> Signup and view all the answers

    What is a physiological consequence of substantial fluid loss, as seen in acute pancreatitis?

    <p>Hypovolemia (D)</p> Signup and view all the answers

    What is the initial fluid resuscitation requirement for a patient experiencing hypovolemia due to pancreatitis?

    <p>10 ml/kg bolus (C)</p> Signup and view all the answers

    Which class of antibiotics is recommended for prophylaxis in pancreatitis management?

    <p>Carbapenems (B)</p> Signup and view all the answers

    Which factor is NOT a recognized risk for chronic pancreatitis?

    <p>Excessive protein intake (A)</p> Signup and view all the answers

    What is the most common type of cancer associated with the pancreas?

    <p>Ductal adenocarcinoma (B)</p> Signup and view all the answers

    Which of the following is a characteristic feature of chronic pancreatitis?

    <p>Dilation of the pancreatic duct (D)</p> Signup and view all the answers

    What mutation is most frequently associated with pancreatic ductal adenocarcinoma?

    <p>KRAS mutation (B)</p> Signup and view all the answers

    What is a common clinical feature of pancreatic cancer?

    <p>Weight loss (C)</p> Signup and view all the answers

    Which of the following is a characteristic of Trousseau's sign related to pancreatic cancer?

    <p>Migratory thrombophlebitis (C)</p> Signup and view all the answers

    What primarily regulates exocrine pancreatic secretion?

    <p>Vago-pancreatic reflex and acetylcholine (D)</p> Signup and view all the answers

    What is the function of centroacinar cells in the pancreas?

    <p>Secretion of NaHCO3 and digestive enzymes (A)</p> Signup and view all the answers

    Which of the following is NOT typically a risk factor for acute pancreatitis?

    <p>Low carbohydrate diet (D)</p> Signup and view all the answers

    What is the pH range of pancreatic juice?

    <p>8.0-8.3 (B)</p> Signup and view all the answers

    In the Atlanta Diagnostic Criteria for acute pancreatitis, how many out of three criteria must be met for diagnosis?

    <p>2 out of 3 (B)</p> Signup and view all the answers

    Which of the following statements is true regarding the pathophysiology of alcoholic pancreatitis?

    <p>Alcohol promotes basolateral secretion of lipase. (C)</p> Signup and view all the answers

    How much pancreatic juice does the exocrine pancreas typically produce each day?

    <p>2-3 liters (D)</p> Signup and view all the answers

    What sign is characterized by bruising above and below the belly button?

    <p>Cullen’s sign (A)</p> Signup and view all the answers

    Which substance is a known inhibitor of pancreatic exocrine secretion?

    <p>Glucagon (C)</p> Signup and view all the answers

    Which dietary factor maximizes pancreatic enzyme output?

    <p>A mixed meal of 20 kcal/kg body weight (D)</p> Signup and view all the answers

    What type of pancreatic inflammation is characterized as a complex and progressive disease with high morbidity and mortality?

    <p>Acute pancreatitis (D)</p> Signup and view all the answers

    What is a common factor that can contribute to the progression from acute to chronic pancreatitis?

    <p>Recurrent episodes of acute pancreatitis (A)</p> Signup and view all the answers

    Which enzyme is primarily associated with fat necrosis in acute pancreatitis?

    <p>Lipase (D)</p> Signup and view all the answers

    Flashcards

    Fluid resuscitation in pancreatitis

    Administer 10 ml/kg bolus for hypovolemia, then 1.5 ml/kg/h.

    Multimodal pain management

    Combination of paracetamol, metamizole, opiates, and epidural analgesia for pain relief.

    Prophylactic antibiotics for pancreatitis

    Carbapenems used to prevent infection in pancreatitis.

    Nutritional requirements in pancreatitis

    15-35 kcal/kg/day energy, 3-6 g/kg/day glucose, 1.2-1.8 g/kg/day protein based on need.

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    Chronic pancreatitis risk factors

    Alcohol and smoking together increase the risk of chronic pancreatitis.

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    Morphological triad of chronic pancreatitis

    Fibrosis, loss of acinar tissue, and ductal changes characterize chronic pancreatitis.

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    Ductal adenocarcinoma of the pancreas

    Most common pancreatic cancer, invasive, with glandular differentiation, poor prognosis.

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    KRAS mutation

    Common mutation in pancreatic cancer influencing cell proliferation located on chromosome 12p12.1.

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    Exocrine pancreas

    The part of the pancreas that produces digestive enzymes and bicarbonate to aid digestion.

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    Acinar cells

    Cells in the exocrine pancreas that secrete enzymes like amylase, lipase, and proteases.

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    Pancreatic juice

    A mixture produced by the exocrine pancreas, containing enzymes and bicarbonate, essential for digestion.

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    Bicarbonate secretion

    The release of bicarbonate from pancreatic ducts to neutralize stomach acid in the duodenum.

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    Acute pancreatitis

    A sudden inflammatory condition of the pancreas that can cause severe abdominal pain and complications.

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    Atlanta Diagnostic Criteria

    Criteria used to diagnose acute pancreatitis, requiring specific clinical and laboratory findings.

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    Etiology of acute pancreatitis

    Common causes include gallstones and alcohol abuse.

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    Alcoholic Pancreatitis

    Pancreatitis resulting from excessive alcohol consumption, leading to enzyme imbalance.

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    Cullen’s sign

    A clinical sign of acute pancreatitis characterized by bruising around the belly button.

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    Risk factors for chronic pancreatitis

    Includes tobacco use, long-term alcohol consumption, and genetics.

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    Perpetuation of acute pancreatitis

    Ongoing issues like hypovolemia and fluid loss that worsen pancreatitis.

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    Endocrine pancreas

    The part of the pancreas that produces hormones like insulin and glucagon.

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    Chronic pancreatitis

    Long-term inflammation of the pancreas that results in permanent damage.

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    Diagnostic approach for pancreatitis

    Involves checking medical history, lab tests, and imaging to find the cause.

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    Vago-pancreatic reflex

    Neural mechanism that stimulates exocrine pancreatic secretion.

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    Fluid resuscitation protocol

    10 ml/kg bolus for hypovolemia, then 1.5 ml/kg/h.

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    Chronic pancreatitis causes

    Caused by alcohol, smoking, genetics, and idiopathic factors.

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    Infected necrosis treatment

    Requires drainage to manage infected necrotic tissue.

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    Nutritional goals in pancreatitis

    Energy: 15-35 kcal/kg/day; glucose: 3-6 g/kg/day.

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    Ductal adenocarcinoma features

    Common pancreatic cancer, poor prognosis, presents with jaundice.

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    Trousseau sign

    Migratory thrombophlebitis indicating underlying malignancy.

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    KRAS mutation significance

    Common mutation in pancreatic cancer that affects growth.

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    Centroacinar cells

    Cells in the pancreas that secrete large amounts of bicarbonate.

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    CCK (Cholecystokinin)

    Hormone released based on protein concentration to stimulate pancreatic secretions.

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    Inhibitors of pancreatic secretion

    Factors like somatostatin and sympathetic stimuli that reduce exocrine function.

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    Cytokine storm

    A response in the first 24-48 hours of pancreatitis leading to inflammation and organ dysfunction.

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    Grey Turner’s sign

    Bruising on the flanks indicating internal bleeding in acute pancreatitis.

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    Risk factors for acute pancreatitis

    Including gallstones, alcohol abuse, and high-fat diets that could trigger episodes.

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    Pancreatic cancer risk factors

    Includes tobacco use, family history, and diabetes type 2.

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    Study Notes

    Pancreatic Disorders

    • Exocrine Pancreas: Comprises 85% of pancreatic mass, composed of acinar cells producing digestive enzymes. Pancreatic ducts deliver secretions to the duodenum, crucial for bicarbonate release.
    • Endocrine Pancreas: Composed of islet cells.
    • Pancreatic Juice: Produced at 2-3 L/day, alkaline (pH 8.0-8.3), isotonic. Rich in bicarbonate (secreted by centroacinar cells via CFTR chloride channel), enzymes (amylase, lipase, trypsin, elastase, nucleases), and proenzymes.
    • Exocrine Secretion Mechanisms: Primarily regulated by the vago-pancreatic reflex and acetylcholine. Cholecystokinin (CCK) from I cells in the small intestine is released based on protein content; insulin also stimulates secretion; Certain fatty acids (Palmitic, Stearic, Caproic) can reduce secretion.
    • Inhibitors of Exocrine Secretion: Somatostatin, pancreatic polypeptide, glucagon, sympathetic stimulus, shock, surgery, metabolic acidosis, fiber-rich and low-fat diet.

    Acute Pancreatitis

    • Definition: A complex, progressive, destructive inflammatory disease of the pancreas with high morbidity and mortality risk.
    • Recurrence and Progression: 20% of first episodes result in recurrence; 3-35% progress to chronic pancreatitis; 30% have severe forms needing ICU admission.
    • Early Phase (First 24-48 hrs): Characterized by cytokine storm and multi-organ dysfunction.
    • Atlanta Diagnostic Criteria: Two or more of these factors: severe/persistent abdominal pain (often radiating to the back), threefold increase in serum lipase/amylase levels above normal, typical imaging findings (CT scan).
    • Etiology:
    • Risk Factors (Acute): Gallstones, alcohol abuse.
    • Risk Factors (Chronic): Tobacco use, alcohol use, genetics,
    • Risk Factors (Pancreatic Cancer): Tobacco use, family history, DM2
    • Risk Factors (Type 1 DM): Genetics, maternal/perinatal factors.
    • Biliary Pancreatitis Etiopathogenesis: Increased intraductal pressure, ductal cell exposure to bile acids and acidification (decreasing aquaporins). Mechanoreceptor PIEZO1 activates pathological calcium signaling in acinar cells. This includes ductal hypertension - papillary oedema, injection of acidic contrast during ERCP; gallstone obstruction.
    • Alcoholic Pancreatitis Mechanisms: Alcohol inhibits apical secretion, while promoting basolateral secretion of lipase into the interstitium. Metabolism of alcohol in acinar cells yields fatty acid ethyl esters, acetaldehyde, and reactive oxygen species (ROS), potentially destabilizing lysosomes & ZG membranes. Furthermore, fatty acid ethyl esters cause ATP synthesis loss in acinar cells.
    • High Alcohol Consumption: >40 g/day for 5 years or more is a risk factor; small quantities (1-20 g/day) also increase risk for chronic pancreatitis.

    Diet, Obesity, and Smoking

    • Diet and Obesity: High intake of calories per kilogram of body weight, and excessive protein (over 110g/day) can hyperstimulate exocrine pancreatic secretion (leading to ER stress). Obesity may increase insulin resistance (causing hyperinsulinemia, further ER exhaustion).
    • Smoking: Doubles the risk of developing acute pancreatitis with 20+ pack years history. Also increases the risk of developing recurrent and chronic pancreatitis. >35 pack years history increases likelihood of Chronic pancreatitis 4.6 fold. Nicotine exposure augments CCK-induced amylase secretion (ER stress).

    Evolution of Acute Pancreatitis

    • Causative Factors: Initiate damage to pancreatic acinar cells, causing trypsin activation.
    • Cascade of Events: Kallikrein-kinin activation leading to edema & inflammation; chymotrypsin activation causing edema & vascular damage; elastase activation leading to vascular damage and hemorrhage; phospholipase A2 activation resulting in coagulation necrosis; and lipase leading to fat necrosis.
    • Clinical Signs: Cullen's sign (bruising around the umbilicus); Grey Turner's sign (bruising of the flanks).
    • Perpetuation: Hypovolemia from vomiting, diarrhea, anorexia; leading to substantial third-space fluid loss and increased intestine ischemia (due to enterocyte apoptosis and bacterial translocation).

    Diagnostic Approach

    • Etiology Determination: History of gallstones, alcohol use, drug use, endoscopy.
    • Admission Assessment: Medical/drug history, calcium levels, SpO2/PaO2, virology testing, complete blood count (CBC), urea and electrolytes.
    • Further Investigations: Virology titers, endoscopic ultrasound, IgG4 and other immunoglobulin levels.

    Management of Pancreatitis

    • Fluid Resuscitation: (10 ml/kg bolus in case of hypovolemia, followed by 1.5 ml/kg/h).
    • Pain Management: Multimodal approach including paracetamol, metamizole, simple opiates, and/or epidural analgesia.
    • Prophylactic Antibiotic Use: Carbapenems.
    • Infected Necrosis Treatment: Drainage.
    • Nutrition: Energy (15-35 kcal/kg/day), glucose (3-6 g/kg/day), and protein (1.2-1.5, 1.8 in severe cases).

    Chronic Pancreatitis

    • Risk Factors: Alcohol and smoking increase the risk when co-occurring
    • Types: Calcifying, obstructive, steroid-responsive (autoimmune pancreatitis).
    • Chronic Calcifying Pancreatitis: Alcohol, smoking, genetics, idiopathic (juvenile, tropical, senile forms).
    • Chronic Obstructive Pancreatitis: Strictures from e.g., blunt trauma, endoscopic stenting, acute pancreatitis, anastomotic stricture. Tumours from e.g., adenocarcinoma, IPMN, serous cystadenoma, islet cell tumor.
    • Steroid-Responsive Pancreatitis: Autoimmune pancreatitis (Type 1 and Type 2).
    • Morphological Triad: Fibrosis, acinar tissue loss (atrophy), and duct changes (distortion and dilation).
    • Smoking and progression: Continued smoking increases chronic pancreatitis progression.

    Pancreatic Cancer (Ductal Adenocarcinoma)

    • Definition: Most common pancreatic cancer, located in exocrine portion. 4th leading cancer-related death cause in the US. An invasive pancreatic epithelial neoplasm with glandular (ductal) differentiation. Poor prognosis.
    • Presentation in Head Tumors: 50% present with biliary tree distention and progressive jaundice.
    • Metastases: Travel to local lymph nodes, liver, lung, peritoneum, adrenal glands, bones, distal nodes.
    • KRAS Mutation: Frequent mutation on chromosome 12p12.1; regulates cell proliferation, differentiation, and apoptosis.
    • Risk Factors: Smoking, alcohol abuse, obesity, high dietary saturated fat, chronic pancreatitis, diabetes, Peutz-Jeghers syndrome, hereditary pancreatitis, familial atypical multiple mole melanoma, Lynch syndrome, familial breast cancer.
    • Clinical Features: Back pain, weight loss, malaise, jaundice, diabetes.
    • Trosseau's Sign: 10% experience migratory thrombophlebitis due to tumor necrosis. Coexisting pancreatitis is also reported in 10%.
    • Diagnosis: Serum lab tests to detect CA19-9; Double duct sign in pancreatic head mass (indicates dilation of both the biliary and pancreatic ducts).
    • Treatment: Palliative treatment includes bypass operations, chemotherapy, and radiation therapy.

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    Description

    Explore the complexities of pancreatic disorders, focusing on both the exocrine and endocrine functions of the pancreas. Understand the mechanisms of secretion, including the effects of various hormones and dietary influences, as well as the implications of acute pancreatitis. This quiz will enhance your knowledge of pancreatic physiology and pathology.

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