13. Pancreatic Disorders and Acute Pancreatitis

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Questions and Answers

What is the recommended initial fluid resuscitation bolus for a patient with hypovolemia due to pancreatitis?

  • 5 ml/kg
  • 10 ml/kg (correct)
  • 15 ml/kg
  • 20 ml/kg

Which class of antibiotics is typically used for prophylactic treatment in pancreatitis?

  • Carbapenems (correct)
  • Penicillins
  • Macrolides
  • Cephalosporins

In the nutritional management of pancreatitis, what is the recommended initial range for daily energy intake?

  • 5-10 kcal/kg/day
  • 15-35 kcal/kg/day (correct)
  • 10-15 kcal/kg/day
  • 35-50 kcal/kg/day

Which of these is NOT a typical component of the morphological triad seen in chronic pancreatitis?

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

What is the most frequent genetic mutation found in patients with ductal adenocarcinoma of the pancreas?

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

The 'double duct sign,' often indicative of a pancreatic head mass, refers to the dilation of which two structures?

<p>Common bile and pancreatic ducts (A)</p> Signup and view all the answers

Which clinical symptom is commonly NOT associated with pancreatic cancer?

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

Regarding chronic pancreatitis, which of the following statements is TRUE?

<p>Smoking cessation can significantly slow progression of the disease. (A)</p> Signup and view all the answers

Which of the following best describes the primary role of centroacinar cells in the pancreas?

<p>Exchanging chloride for bicarbonate to produce alkaline pancreatic juice. (A)</p> Signup and view all the answers

According to the provided text, what is the primary mechanism that stimulates exocrine secretion from the pancreas?

<p>The vago-pancreatic reflex and acetylcholine release. (B)</p> Signup and view all the answers

Which of the following is a known inhibitor of pancreatic exocrine secretion?

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

Which of the following is NOT part of the diagnostic criteria for acute pancreatitis according to the Atlanta criteria?

<p>A two-fold increase in serum lipase levels. (C)</p> Signup and view all the answers

In biliary pancreatitis, what is the role of bile acids in the pathogenesis of the disease?

<p>They decrease the aquaporins amount within the ductal cells resulting in fluid stasis. (D)</p> Signup and view all the answers

What is the main consequence of alcohol metabolism in acinar cells that can contribute to pancreatitis?

<p>Formation of fatty acid ethyl esters, acetaldehyde and ROS that destabilize lysosome and zymogen granules (ZG) membranes. (A)</p> Signup and view all the answers

What is the result of excessive stimulation of the exocrine pancreas from a single meal?

<p>Endoplasmic reticulum (ER) stress and potentially cell damage. (A)</p> Signup and view all the answers

How does nicotine exposure, at low concentrations, affect the pancreas?

<p>It augments CCK-induced amylase secretion, likely increasing ER stress (A)</p> Signup and view all the answers

Which of the following is associated with the activation of elastase in the evolution of acute pancreatitis?

<p>Vascular damage and hemorrhage. (A)</p> Signup and view all the answers

What symptom is associated with the presence of Cullen's sign in a patient?

<p>Bruising above and below the belly button. (B)</p> Signup and view all the answers

According to the provided text, what is the primary mechanism by which fatty acid ethyl esters contribute to acinar cell damage?

<p>Inhibition of ATP synthesis (C)</p> Signup and view all the answers

Based on the text, what is the minimum daily alcohol consumption, for males, over 5 years, considered a risk factor for chronic pancreatitis?

<p>40 g/d (B)</p> Signup and view all the answers

What protein intake during a meal, as described in the text, might lead to hyperstimulation of the exocrine pancreas?

<p>More than 40 grams plus 20% of total calories from proteins (C)</p> Signup and view all the answers

What is the recommended range for fat composition in a ketogenic dietary regimen?

<p>70-75% (A)</p> Signup and view all the answers

What condition is identified in the text as a possible outcome of obesity, and that leads to ER exhaustion?

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

Which of the following best describes the anatomical location of the pancreas in relation to the peritoneum?

<p>Retroperitoneal, located behind the peritoneum. (A)</p> Signup and view all the answers

In the macroscopic view of the pancreas, which feature is specifically described as being well-defined?

<p>The outer borders of the pancreas. (D)</p> Signup and view all the answers

What is the primary goal when assessing a patient for a pancreatic disorder, based on the stated objectives?

<p>To enumerate the multifactorial etiology of the pancreatic pathology. (B)</p> Signup and view all the answers

Which of the following is NOT identified as a primary focus of study regarding pancreatic disorders?

<p>The detailed cellular structure of the islets of Langerhans. (A)</p> Signup and view all the answers

Which of the following is included in the main focus regarding disorders of the exocrine pancreas?

<p>Inflammation and neoplasia. (B)</p> Signup and view all the answers

What is the initial step in the differential diagnosis of a patient with a suspected pancreatic disorder, according to the objectives?

<p>Formulate a differential diagnosis based on the patient's presentation. (D)</p> Signup and view all the answers

Which body of guidelines does the text specifically mention for the management of severe acute pancreatitis?

<p>The World Society of Emergency Surgery (WSES) guidelines. (D)</p> Signup and view all the answers

What aspect of pancreatic disorders is highlighted for assessment when establishing a treatment plan in the given objectives?

<p>The efficacy of current therapeutic approaches. (D)</p> Signup and view all the answers

What is the approximate increased risk of developing acute pancreatitis (AP) for individuals with a smoking history of at least 20 pack-years?

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

According to the information provided, individuals with a history of more than 35 pack-years of smoking are how much more likely to develop chronic pancreatitis (CP)?

<p>4.6 times more likely (B)</p> Signup and view all the answers

Based on the content, what is the potential increase in risk of pancreatic cancer associated with smoking?

<p>Up to 6-fold (C)</p> Signup and view all the answers

How does low concentration exposure to nicotine (100µM) affect amylase secretion in the pancreas?

<p>It augments CCK-induced amylase secretion leading to ER stress (A)</p> Signup and view all the answers

What is the relationship between smoking and the occurence of recurrent acute pancreatitis (AP)?

<p>Smoking increases the possibility of recurrent AP (C)</p> Signup and view all the answers

What is the primary pathological process activated in acute pancreatitis involving DAMPs?

<p>Activation of the NF-kB pathway (D)</p> Signup and view all the answers

Besides smoking, what other potential etiology of acute pancreatitis is mentioned in the text?

<p>Drug-induced (A)</p> Signup and view all the answers

Based on the information provided, what is the effect of smoking on the progression of pancreatitis?

<p>It elevates the risk of acute pancreatitis and the risk of developing chronic pancreatitis (C)</p> Signup and view all the answers

What is a key factor in the development of biliary pancreatitis?

<p>Obstruction of the pancreatic duct causing intraductal hypertension. (C)</p> Signup and view all the answers

How does alcohol influence pancreatic secretion?

<p>Alcohol inhibits apical secretion while promoting basolateral release of enzymes. (C)</p> Signup and view all the answers

What is the role of the mechanoreceptor PIEZO1 in the context of pancreatitis?

<p>It triggers pathological calcium signaling in acinar cells. (B)</p> Signup and view all the answers

Which of the following is a consequence of alcohol metabolism in acinar cells?

<p>Destabilization of lysosome and zymogen granule membranes. (D)</p> Signup and view all the answers

What impact do bile acids have on aquaporins in ductal cells?

<p>They decrease the amount of aquaporins. (C)</p> Signup and view all the answers

Which of these can lead to ductal hypertension in the pancreas?

<p>Acidic contrast injection into the pancreatic duct during ERCP. (B)</p> Signup and view all the answers

What is the consequence of reduced aquaporin levels in pancreatic ductal cells?

<p>Intraductal fluid stasis. (C)</p> Signup and view all the answers

How does the basolateral secretion of lipase contribute to pancreatitis?

<p>It leads to the release of lipase into the interstitium. (A)</p> Signup and view all the answers

A patient presents with jaundice and imaging reveals a pancreatic head tumor. According to the provided text, what percentage of such tumors are associated with distention of the biliary tree?

<p>50% (C)</p> Signup and view all the answers

Which of the following is NOT identified as a risk factor for ductal adenocarcinoma of the pancreas in the text?

<p>Low fiber diet (B)</p> Signup and view all the answers

A patient with pancreatic cancer develops migratory thrombophlebitis. According to the text, this is known as Trousseau sign and occurs in roughly what percentage of cases?

<p>10% (A)</p> Signup and view all the answers

What is the most frequent location for initial metastasis in cases of ductal adenocarcinoma of the pancreas, according to the text?

<p>Local lymph nodes (C)</p> Signup and view all the answers

According to the provided text, besides palliative chemotherapy and radiation, what is another main palliative treatment strategy for pancreatic ductal adenocarcinoma?

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

Which of the following best describes the relationship between the cytokine storm and end-organ dysfunction in acute pancreatitis?

<p>The cytokine storm causes an inflammatory cascade, potentially leading to reversible or irreversible end-organ dysfunction. (A)</p> Signup and view all the answers

According to the provided diagram, which of the following is NOT a direct end-organ dysfunction resulting from the inflammatory cascade in acute pancreatitis?

<p>Pulmonary Embolism (PE) (D)</p> Signup and view all the answers

Which of the following best describes how hypovolemia contributes to the perpetuation of acute pancreatitis?

<p>Hypovolemia leads to substantial third space fluid loss as well as ischemia, increasing bacterial translocation. (A)</p> Signup and view all the answers

What is the role of apoptosis of enterocytes in the perpetuation of acute pancreatitis?

<p>It increases intestinal ischemia, bacterial translocation and perpetuation of the disease. (D)</p> Signup and view all the answers

How does bacterial translocation secondary to increased ischemia and enterocyte apoptosis worsen acute pancreatitis?

<p>It can lead to systemic inflammation and sepsis. (D)</p> Signup and view all the answers

Which of these processes is NOT directly related to the perpetuation of disease, according to the text?

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

What is the main consequence of the inflammatory cascade initiated by a cytokine storm?

<p>Reversible or irreversible end-organ dysfunction. (D)</p> Signup and view all the answers

Which of the following is a direct consequence of hypovolemia as it relates to acute pancreatitis?

<p>Increased intestinal ischemia. (D)</p> Signup and view all the answers

Flashcards

Acinar Cells

The functional unit of the exocrine pancreas, responsible for producing digestive enzymes.

Vago-Pancreatic Reflex

The primary mechanism for stimulating exocrine pancreatic secretion, involving vagal nerve stimulation and acetylcholine release.

Cholecystokinin (CCK)

A hormone released by the small intestine in response to the presence of protein, stimulating pancreatic enzyme secretion.

Acute Pancreatitis (AP)

A complex, inflammatory disease of the pancreas with high morbidity and mortality, characterized by pain, elevated pancreatic enzymes, and potential multi-organ dysfunction.

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Biliary Pancreatitis

A common cause of acute pancreatitis, often associated with gallstones obstructing the pancreatic duct.

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Alcoholic Pancreatitis

A cause of acute pancreatitis associated with excessive alcohol intake, leading to pancreatic cell damage and enzyme leakage.

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High-Fat Diet

A potential risk factor for acute pancreatitis, linked to excessive dietary fat and protein intake, which can overstimulate pancreatic enzyme production.

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Smoking

A potential contributor to acute pancreatitis, where smoking increases the risk of both acute and chronic pancreatitis.

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Trypsin Activation

A pathophysiologic change in acute pancreatitis where pancreatic enzymes become activated, causing damage to surrounding tissues.

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Cullen's Sign

A sign of acute pancreatitis characterized by bruising around the belly button, often indicating severe disease.

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Fluid Resuscitation for Pancreatitis

Fluid is given to patients with pancreatitis to prevent dehydration and support vital organ function. The initial bolus is 10 ml/kg, followed by a continuous infusion of 1.5 ml/kg/hour.

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Pain Management for Pancreatitis

Pancreatitis causes intense pain. To manage this, we use a combination of pain relievers such as paracetamol, metamizole, and even opioids. Epidural analgesia is also an option.

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Prophylactic Antibiotics for Pancreatitis

Carbapenems are a type of antibiotic used to prevent infection in patients with pancreatitis. Infections can be a serious complication.

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Alcohol and Smoking in Chronic Pancreatitis

Alcohol and smoking are major contributors to developing chronic pancreatitis. They often occur together, increasing the risk significantly.

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Chronic Calcifying Pancreatitis

Chronic Calcifying Pancreatitis is a type of chronic pancreatitis where calcium deposits form in the pancreas. It can be triggered by alcohol, smoking, genetics or even unknown reasons.

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Ductal Adenocarcinoma

Ductal adenocarcinoma, the most common pancreatic cancer, arises from the exocrine part of the pancreas. It is invasive, meaning it spreads quickly and can metastasize.

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KRAS Mutation in Pancreatic Cancer

KRAS is a gene that helps regulate cell growth. Mutations in KRAS are very common with ductal adenocarcinoma, driving its uncontrolled growth.

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Symptoms of Ductal Adenocarcinoma

Ductal adenocarcinoma often causes symptoms like back pain, unexplained weight loss, tiredness, jaundice, and new-onset diabetes.

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Acute Pancreatitis

Inflammation of the pancreas, characterized by pain, elevated pancreatic enzymes, and potential organ damage. Usually due to gallstones, alcohol abuse, or other factors.

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Chronic Pancreatitis

A chronic condition where the pancreas becomes progressively damaged, leading to impaired digestion and possible diabetes.

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Pancreatic Adenocarcinoma

A malignant tumor arising from the exocrine portion of the pancreas, usually in the ducts.

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Intrapancreatic Enzyme Activation

Process by which pancreatic enzymes become activated inside the pancreas, leading to tissue destruction. This occurs in acute pancreatitis and can worsen the condition.

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High Alcohol Consumption and Pancreatitis

A high alcohol intake (over 40g/day for men and 20g/day for women) sustained for more than 5 years. It is a major risk factor for chronic pancreatitis.

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Fatty Acid Ethyl Esters and Pancreatitis

Fatty acid ethyl esters, produced by alcohol metabolism, disrupt ATP production in acinar cells, the functional unit of the exocrine pancreas. This disruption leads to impaired pancreatic function and potentially pancreatitis.

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Ketogenic Diet for Pancreatitis

A specific dietary regimen for managing pancreatitis involves limiting carbohydrate intake to 5-10%, increasing fat intake to 70-75%, and maintaining 20-25% protein intake. This diet aims to reduce pancreatic stress and promote healing.

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Obesity and Insulin Resistance in Pancreatitis

Increased insulin resistance, often caused by obesity, leads to elevated insulin levels (hypersulinemia). This can overload the pancreas, causing ER stress and potentially contribute to pancreatitis.

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Ductal Hypertension

Increased pressure inside the pancreatic duct, which can cause damage and inflammation. This can happen because of things like swelling, blockages, or injecting dye during ERCP.

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Aquaporins

A protein that helps control water movement across cell membranes. Its decrease in pancreatic ductal cells leads to fluid retention and pressure build-up.

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PIEZO1

A protein involved in sensing pressure in cells. It acts as a pressure sensor and plays a role in the process of inflammation in pancreatitis.

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Auto-Digestion

The buildup of digestive enzymes within the pancreas, causing damage and inflammation. It's like the pancreas digesting itself from the inside.

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Ductal Cells

Specialized cells that line the pancreatic duct and play a role in secretion, reabsorption, and pressure regulation.

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Smoking and Acute Pancreatitis

A significant risk factor for acute pancreatitis, doubling the risk with at least 20 pack years of cigarette smoking.

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Smoking and Chronic Pancreatitis

Increased risk of chronic pancreatitis (CP) with a history of heavy smoking (>35 pack years).

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Smoking and Pancreatic Cancer

Smoking increases the risk of pancreatic cancer by several folds, depending on the duration and intensity.

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Nicotine's Effect on Pancreas

Nicotine, even at low concentrations, can trigger pancreatic enzyme release, leading to inflammation.

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Drug-Induced Acute Pancreatitis

A type of acute pancreatitis caused by medications.

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Acute Pancreatitis: Evolution

A complex process involving inflammation, damage to pancreatic cells, and potential organ dysfunction.

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Acute Pancreatitis: Cytokine Storm

A cascade of inflammatory molecules, like DAMPs and NF-KB, contributes to severe acute pancreatitis.

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Cytokine Storm

A severe inflammatory response within the body, often triggered by acute pancreatitis, characterized by the release of inflammatory mediators like cytokines.

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Systemic Inflammatory Response Syndrome (SIRS)

A serious complication of acute pancreatitis where the body's immune response becomes uncontrolled, leading to widespread tissue damage and organ dysfunction.

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Acute Respiratory Distress Syndrome (ARDS)

A condition characterized by fluid accumulation in the lungs, leading to breathing difficulties, often a complication of severe acute pancreatitis.

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Acute Kidney Injury (AKI)

A state of kidney failure, often a sign of severe acute pancreatitis, indicating damage to the kidneys.

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Liver Failure

Impaired liver function, another serious complication of acute pancreatitis, disrupting the liver's vital roles.

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Heart Failure

Reduced heart function, often seen in severe acute pancreatitis due to inflammation or circulatory problems.

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Encephalitis

Inflammation and dysfunction of the brain, a serious complication of acute pancreatitis, possibly due to toxins or infection.

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Perpetuation of Acute Pancreatitis

A process that worsens acute pancreatitis, characterized by fluid loss, reduced blood flow to the intestines, and bacterial translocation.

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KRAS Mutation

A gene located on chromosome 12p12.1, involved in regulating cell growth, differentiation, and death. Mutations in this gene are very common in pancreatic ductal adenocarcinoma, driving uncontrolled cell growth.

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Double Duct Sign

A classic sign of pancreatic cancer, often indicating a pancreatic head mass. It involves the simultaneous enlargement of both the pancreatic and biliary ducts.

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Coexisting Pancreatitis

A rare complication of pancreatic cancer, occurring in about 10% of cases. It involves inflammation of the pancreas, which might further worsen the condition.

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Percentage of Pancreas Tumors Inoperable

The proportion of pancreatic tumors that are not suitable for curative surgery, meaning they are too advanced for complete removal.

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Study Notes

Pancreatic Disorders

  • Exocrine Pancreas: Comprises 85% of pancreatic mass; acinar cells are functional units producing digestive enzymes. Pancreatic ducts deliver secretions to the duodenum, a crucial function being bicarbonate secretion.
  • Endocrine Pancreas: Composed of islet cells.
  • Pancreatic Juice: ~2-3 liters/day; alkaline (pH 8-8.3), isotonic, rich in bicarbonate (NaHCO₃). Also contains enzymes (amylase, lipase, trypsin, elastase, nucleases) and proenzymes.

Acute Pancreatitis

  • Characteristics: Progressive, destructive inflammatory condition of the pancreas, high morbidity/mortality.
  • Recurrence/Progression: 20% of first-time cases have recurrences; 3-35% progress to chronic pancreatitis; 30% become severe, requiring ICU.
  • Early Course (24-48 hours): Characterized by cytokine storm and multi-organ dysfunction.
  • Atlanta Diagnostic Criteria: (2/3): Persistent severe abdominal pain (often radiating to back), 3x serum lipase/amylase increase above normal, imaging findings of pancreatitis.
  • Etiology/Risk Factors:
  • Acute: Gallstones, alcohol abuse, drug reactions, hypertriglyceridemia, certain medications, and infections.
  • Chronic: Tobacco use, alcohol use, genetics, hypertriglyceridemia.
  • Pancreatic Cancer: Tobacco use, family history, DM2, high saturated fat intake, specific genetic syndromes.
  • Type 1 DM: Genetics, maternal/perinatal factors.

Biliary Pancreatitis Etiopathogenesis

  • Mechanism: Increased pressure, bile acid exposure and acidification in ductal cells; Intraductal fluid stasis caused by decreasing aquaporins by bile acids.
  • Pathological processes: Acini cell activation of mechanoreceptor PIEZO1 triggers pathological calcium signaling.
  • Examples of ductal hypertension: Papillary edema, acidic contrast injection, gallstone obstruction.
  • Other Factors: Ductal cell exposure to bile acids, and intraductal pressure increases are key pathological processes to understand.

Alcoholic Pancreatitis

  • Mechanism: Alcohol inhibits apical secretion, promoting basolateral secretion of lipase, leading to release into interstitium (between cells).
  • Alcohol Metabolism: Converts alcohol to fatty acid ethyl ester, acetaldehyde, and reactive oxygen species (ROS), destabilizing lysosomes and membranes.
  • ATP Loss: Fatty acid ethyl esters result in reduced ATP synthesis in acinar cells.
  • Risk: Associated with >40g/day for 5+ years; potentially higher risk with lower consumption.

Diet, Obesity, Smoking and Pancreatitis

  • Diet/Obesity: High protein meals (esp >40g at a time) can overstimulate exocrine pancreas, causing ER stress. Obesity might increase insulin resistance/hyperinsulinemia, further stressing acinar cells.
  • Smoking: Doubles risk with at least 20 pack-years. Related to recurrent and chronic pancreatitis (4.6x greater risk with > 35 pack years).
  • Nicotine: Low concentrations increase CCK-induced amylase secretion (ER stress).
  • Dietary fat: High intake of dietary saturated fat is a risk factor.

Evolution of Acute Pancreatitis

  • Causative Factors: Damage to pancreatic acinar cells.
  • Activation Cascade: Trypsin activation leads to edema, inflammation; activation of other enzymes (chymotrypsin, elastase, phospholipase A2, lipase) further promotes inflammation, vascular damage, fat necrosis.
  • Symptoms (Signs): Cullen's sign (bruising around umbilicus), Grey Turner's sign (flank bruising).

Perpetuation of the Disease

  • Factors: Hypovolemia (vomiting, diarrhea, anorexia); third space fluid loss; intestinal ischemia due to enterocyte apoptosis and bacterial translocation.

Diagnostic Approach

  • Etiology Determination: Focus on determining underlying cause (gallstones, alcohol, drugs) via history, endoscopic procedures.
  • Assessment: Medical history, drug history, electrolyte profile, blood oxygenation, biochemistry, complete blood count (CBC).
  • Further investigations: Virology, endoscopic ultrasound, IgG4, other immunoglobulins (Ig), C-reactive protein (CRP).

Management of Pancreatitis

  • Fluid Resuscitation: 10 mL/kg bolus in hypovolemia, followed by 1.5 mL/kg/hour maintenance.
  • Pain Management: Multimodal approach (paracetamol, metamizole, opiates, epidural analgesia).
  • Antibiotics: Prophylactic carbapenems.
  • Infected Necrosis: Surgical drainage.
  • Nutrition: 15-35 kcal/kg/day; 3-6 g glucose/kg/day (with insulin to maintain blood glucose < 10 mmol/L). 1.2-1.5 g/kg protein (1.8 in severe cases).

Chronic Pancreatitis

  • Types: Calcifying, obstructive, steroid-responsive (autoimmune).
  • Causes: Alcohol, smoking, genetics, idiopathic (juvenile, tropical, senile), hypertriglyceridemia and certain medications.
  • Obstructive: Strictures (blunt trauma, endoscopic stenting, acute pancreatitis, anastomotic strictures/tumors (adenocarcinoma, IPMN, serous cystadenoma, islet cell tumor).
  • Risk factors: Continued smoking after development accelerates chronic pancreatitis progression; Genetics & cystic fibrosis can cause acute recurrent pancreatitis.
  • Pathological features: Fibrosis, loss of acinar tissue, duct distortion/dilation.

Pancreatic Ductal Adenocarcinoma

  • Description: Most common pancreatic cancer; 4th leading cancer death cause in US.
  • Characteristics: Invasive pancreatic epithelial neoplasm with glandular (ductal) differentiation.
  • Poor Prognosis: Often aggressive
  • Tumor Location and Manifestations: Head tumors often cause biliary obstruction/jaundice.
  • Metastasis: Common to local lymph nodes, liver, lungs, peritoneum, adrenal glands, bone.
  • KRAS Mutation: Frequent mutation impacting cell growth/death regulation (>90%).
  • Risk Factors: Smoking, alcohol abuse, obesity, dietary saturated fat, chronic pancreatitis, diabetes, specific genetic syndromes (Peutz-Jeghers, hereditary pancreatitis, familial atypical mole melanoma, Lynch syndrome. familial breast cancer).
  • Clinical Features: Back pain, weight loss, malaise, jaundice, diabetes, Trosseau Sign (Migratory thrombophlebitis in some cases (10%)).
  • Diagnosis: Lab tests (CA19-9 detection); Double duct sign (biliary and pancreatic duct dilation).
  • Treatment: Palliative, including bypass surgery, chemotherapy, radiation therapy.

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