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Pancreatitis

Background knowledge 🧠

Definition

  • Pancreatitis: Inflammation of the pancreas. Commonly due to alcohol or gallstones.
    • Characterised by autodigestion of pancreatic tissue by its enzymes, resulting in necrosis.
  • Acute Pancreatitis (AP): Sudden inflammation, which often resolves with treatment.
  • Chronic Pancreatitis (CP): Persistent inflammation, causing irreversible damage.

Causes

  • Gallstones
  • Alcohol
  • Medications (e.g. azathioprine, thiazide diuretics)
  • Trauma
  • Metabolic disorders (e.g. hypercalcaemia)
  • Viral infections (e.g. mumps)

Clinical Features 🌡️

Clinical features

  • Abdominal pain: Severe epigastric pain, often radiating to the back.
  • Commonly accompanied by vomiting.
  • Examination may show epigastric tenderness, ileus, and a low-grade fever.
  • Rare signs include periumbilical discolouration (Cullen’s sign) and flank discolouration (Grey-Turner’s sign).
  • Rarely, ischaemic (Purtscher) retinopathy may occur, leading to temporary or permanent blindness.

Investigations 🧪

Tests

  • Serum amylase: Elevated in about 75% of patients; typically >3 times the upper limit of normal. However, its level does not correlate with severity. Specificity for pancreatitis is around 90%.
    • Other conditions causing raised amylase include pancreatic pseudocyst, mesenteric infarct, perforated viscus, acute cholecystitis, and diabetic ketoacidosis.
  • Serum lipase: More sensitive and specific than amylase. Useful for late presentations (>24 hours) due to its longer half-life.
  • Imaging: Diagnosis can be confirmed without imaging if there’s characteristic pain and amylase/lipase is >3 times the normal level.
    • However, early ultrasound is crucial to determine the cause, especially for gallstones/biliary obstruction. Other options include contrast-enhanced CT.

Scoring systems

  • Used to identify severe cases:
    • Ranson score
    • Glasgow score
    • APACHE II, etc.
  • Indicators of severe pancreatitis include:
    • Age >55 years, hypocalcaemia, hyperglycaemia, hypoxia, neutrophilia, and elevated LDH & AST. Note: amylase level is not of prognostic value.

Management 🥼

Management

  • Supportive care: Fluid resuscitation, analgesia.
  • Nutritional support: Initial fasting followed by a low-fat diet.
  • Alcohol cessation, if alcohol-induced.
  • Addressing the underlying cause, e.g., gallstone removal.
  • Surgery (usually avoided) for severe cases or complications.

Prognosis

  • Most cases of acute pancreatitis recover completely.
  • Chronic cases can lead to lasting damage and need long-term management.

Complications

  • Pseudocyst: Fluid-filled cyst-like cavities.
  • Haemorrhage
  • Infection
  • Organ failure, especially respiratory or kidney (these are the two main indications for referral to intensive care units)
  • Chronic pancreatitis can lead to malabsorption and diabetes.

Key Points

  • Common causes include gallstones and alcohol.
  • Acute pancreatitis typically presents with severe epigastric pain radiating to the back as well as vomiting.
  • Clinical signs include epigastric tenderness, low-grade fever, Cullen’s sign and Grey-Turner’s sign
  • Serum lipase is more sensitive and specific than serum amylase.
  • Ranson score and Glasgow score can be calculated to identify severe pancreatitis.
  • Management involves supportive care –  fluid resuscitation and pain relief.

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Clinical features of acute pancreatitis include:

Classically the pain is epigastric, radiating to the back.

This is a sensation of incomplete rectal emptying.

This is nailbed capillary pulsation in aortic regurgitation.

This is flank bruising indicating necrotizing pancreatitis.


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