Pancreatitis clinical case
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"acute pancreatitis" AND management
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Give me Clinical cases on pancreatitis and hartnups disease and MCAD biochemistry for MBBS exams
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I now have all the content needed. Let me compile the three comprehensive MBBS-level clinical cases.Here are three high-yield MBBS clinical cases, each modeled on the style of university exam questions.
MBBS Clinical Cases: Pancreatitis | Hartnup Disease | MCAD Deficiency
CASE 1 - ACUTE PANCREATITIS
Vignette
A 45-year-old obese woman presents to the emergency department with a 12-hour history of severe, constant epigastric pain radiating to her back. She reports nausea and two episodes of vomiting. She denies alcohol use. On review of systems, she mentions similar but milder pain after fatty meals over the past few months.
Examination:
- Temperature: 38.2°C | HR: 104 bpm | BP: 100/70 mmHg | RR: 20/min
- Epigastric tenderness with guarding; voluntary rigidity
- Bowel sounds reduced
- No jaundice; BMI 32
Investigations:
| Test | Result | Reference |
|---|---|---|
| Serum lipase | 1,240 U/L | 10-140 U/L |
| Serum amylase | 890 U/L | 28-100 U/L |
| WBC | 14.5 x 10⁹/L | 4-11 |
| Serum calcium | 1.9 mmol/L | 2.1-2.6 |
| Blood glucose | 9.8 mmol/L | 3.9-5.6 |
| Hematocrit | 0.48 | 0.36-0.46 |
| CRP | 180 mg/L | <10 |
| ALT | 3.8x ULN | - |
| Serum triglycerides | 1.8 mmol/L | Normal |
Questions
Q1. What is the diagnosis and what criteria confirm it?
Answer: Acute pancreatitis. The Atlanta Criteria require at least 2 of 3: (1) characteristic epigastric pain radiating to the back, (2) serum lipase or amylase >3x upper limit of normal (lipase is 1,240 - nearly 9x ULN; amylase >8x ULN), and (3) imaging findings consistent with pancreatitis. This patient satisfies criteria 1 and 2. Lipase is the preferred marker because it has greater sensitivity and specificity than amylase, which is also produced by salivary glands and other organs. - Rosen's Emergency Medicine, p.1265; Robbins & Kumar Basic Pathology
Q2. What is the most likely etiology, and what finding supports it?
Answer: Gallstone pancreatitis (biliary). Gallstones account for 40-70% of acute pancreatitis cases. The key clue is:
- A history of pain after fatty meals (symptomatic cholelithiasis)
- ALT >3x ULN - if the AST/ALT is >3x upper normal limit, gallstones are present as the etiology in 95% of cases
- Obesity and female sex increase gallstone risk
- An abdominal ultrasound must be performed urgently to evaluate for biliary etiology
Q3. Describe the pathophysiology.
Answer: The inciting event (gallstone obstruction of the ampulla of Vater) disrupts normal membrane trafficking within acinar cells. This triggers inappropriate intracellular activation of trypsinogen into trypsin. Trypsin then activates other digestive pro-enzymes (chymotrypsin, elastase, phospholipase A2), causing autodigestion of pancreatic parenchyma. Macrophage and neutrophil recruitment amplifies the inflammatory cascade. Cytokine release increases vascular permeability leading to edema, hemorrhage, and necrosis. In severe cases, SIRS, sepsis, ARDS, and multiorgan failure can develop. Bacterial translocation from the gut can cause infected necrosis. - Rosen's Emergency Medicine
Q4. How do you assess severity? Name the scoring systems.
Answer: Severity is classified as mild, moderately severe, or severe:
- Ranson's criteria - scored at admission (5 criteria) and at 48 hours (6 criteria)
- BISAP score (Bedside Index of Severity in Acute Pancreatitis) - 5 variables: BUN >25, impaired mental status, SIRS, age >60, pleural effusion
- APACHE II score
- CT Severity Index (CTSI) - Balthazar grading based on CT findings
- This patient's elevated hematocrit (hemoconcentration), hypocalcemia, hyperglycemia, leukocytosis, and elevated CRP all suggest a moderately severe episode. - Current Surgical Therapy 14e; Rosen's Emergency Medicine
Q5. What is the management?
Answer:
- Fluid resuscitation - Lactated Ringer's is preferred over normal saline (more physiological, has potential anti-inflammatory effects)
- Analgesia - IV opioids; no single agent is superior
- NPO initially, then early oral/enteral feeding as tolerated (enteral nutrition preferred over parenteral)
- No prophylactic antibiotics - only if infected necrosis or sepsis is confirmed
- ERCP only if cholangitis or biliary obstruction is present
- Abdominal ultrasound to confirm gallstones; plan cholecystectomy before discharge to prevent recurrence
- CT scan is NOT routine - reserve for diagnostic uncertainty or suspicion of complications (necrosis, abscess, pseudocyst)
Local complications to monitor for: pseudocyst (>4 weeks), acute necrotic collection, walled-off necrosis - Rosen's Emergency Medicine; ACG Guidelines 2024 [PMID: 38857482]
Q6. What are the complications of acute pancreatitis?
Answer:
| Local | Systemic |
|---|---|
| Pseudocyst | ARDS |
| Infected pancreatic necrosis | AKI |
| Walled-off necrosis | Hypocalcemia |
| Pancreatic abscess | Hyperglycemia |
| Splenic vein thrombosis | DIC |
| Pleural effusion | |
| Shock/SIRS |
Hypocalcemia occurs due to saponification - calcium is deposited as calcium soaps in areas of fat necrosis (precipitation with free fatty acids released by lipase). - Robbins & Kumar Basic Pathology
CASE 2 - HARTNUP DISEASE
Vignette
A 7-year-old boy is brought by his parents with a 3-week history of a red, scaly rash on his face, neck, hands, and forearms that worsens in sunlight. His parents also report episodes of unsteady gait and slurred speech over the past week. He has no known dietary deficiencies. He attends school but has been increasingly irritable with mood changes. His parents are first cousins. Urine dipstick is negative. Plasma amino acid levels are normal.
Key investigations:
| Finding | Result |
|---|---|
| Urine amino acid analysis | Markedly elevated neutral amino acids (tryptophan, alanine, serine, threonine, leucine, isoleucine, valine, phenylalanine) |
| Plasma amino acids | Normal |
| Plasma niacin | Normal |
| Urine indoles | Elevated |
Questions
Q1. What is the diagnosis?
Answer: Hartnup Disease - an autosomal recessive inborn error of neutral amino acid transport. Named after the Hartnup family in whom it was first described, it is the second most common inherited aminoaciduria after PKU. The clinical triad of pellagra-like photosensitive dermatitis + cerebellar ataxia + neuropsychiatric symptoms is classic. - Andrews' Diseases of the Skin; Medical Physiology (Boron & Boulpaep)
Q2. What is the molecular defect?
Answer: Mutation in the SLC6A19 gene encoding the B⁰ (system B-zero) transporter on the apical membrane of intestinal epithelial cells and renal tubular cells. This transporter normally absorbs neutral amino acids (including tryptophan) from the intestinal lumen into enterocytes and reabsorbs them in the renal proximal tubule.
- Intestinal effect: Reduced absorption of tryptophan → less tryptophan available for nicotinamide (niacin/Vitamin B3) synthesis → functional niacin deficiency → pellagra-like features
- Renal effect: Failure to reabsorb neutral amino acids → neutral aminoaciduria in urine despite normal plasma levels
The key distinction: plasma amino acid levels are normal (because oligopeptide transporters are intact - absorbed oligopeptides are hydrolyzed intracellularly), but urine shows massive neutral aminoaciduria. - Medical Physiology; Basic Medical Biochemistry 6e
Q3. Why does the rash resemble pellagra if niacin levels are normal?
Answer: Niacin (Vitamin B3) can be synthesized endogenously from tryptophan (60 mg tryptophan → 1 mg niacin). In Hartnup disease, tryptophan absorption from the gut is severely impaired. Even though exogenous dietary niacin intake is adequate and plasma niacin appears normal, the body cannot synthesize niacin from tryptophan. In low-protein diets (as in developing countries), this becomes clinically obvious. The manifestations are worse with poor dietary protein intake and in sunlight exposure (photosensitivity). Unabsorbed tryptophan in the colon is converted by gut bacteria to indole derivatives, which are excreted in urine (indicanuria). - Yamada's Textbook of Gastroenterology; Andrews' Diseases of the Skin
Q4. How is the diagnosis confirmed?
Answer:
- Urine amino acid chromatography/analysis: Markedly elevated neutral amino acids (tryptophan, alanine, serine, valine, leucine, isoleucine, phenylalanine, histidine) - the hallmark finding
- Plasma amino acids and plasma niacin are characteristically normal
- Elevated urinary indoles (indican) from bacterial breakdown of gut tryptophan
- Consanguinity in parents increases suspicion of autosomal recessive disorder
Q5. How is Hartnup disease treated?
Answer:
- Oral nicotinamide (niacinamide) - bypasses the tryptophan pathway and corrects niacin deficiency. Reverses the skin manifestations.
- High-protein diet - increases oligopeptide-bound amino acid absorption (oligopeptide transporters are unaffected), compensating for the transport defect
- Neurological symptoms may not fully reverse with niacinamide
- The disease becomes milder with increasing age - Andrews' Diseases of the Skin
Q6. Distinguish Hartnup disease from classic pellagra (3Ds).
| Feature | Hartnup Disease | Classic Pellagra |
|---|---|---|
| Cause | Genetic (SLC6A19 mutation) | Dietary niacin/tryptophan deficiency |
| Urine amino acids | Elevated neutral AAs | Normal |
| Plasma amino acids | Normal | Low (protein-energy malnutrition) |
| Inheritance | Autosomal recessive | Acquired |
| Response to niacin | Partial (skin improves) | Full response |
| Key feature | Aminoaciduria | Dietary deficiency |
CASE 3 - MCAD DEFICIENCY (Medium-Chain Acyl-CoA Dehydrogenase Deficiency)
Vignette
A 14-month-old girl, Lola, is brought to the pediatric emergency department after a 24-hour viral illness with vomiting and poor feeding. She has not eaten for 18 hours. On examination she is drowsy, hypotonic, and difficult to arouse. There is no hepatomegaly. Her 4-year-old brother had a similar episode at age 2 and died suddenly. Her parents are healthy with no known metabolic conditions.
Investigations:
| Test | Result | Reference |
|---|---|---|
| Blood glucose | 1.8 mmol/L (32 mg/dL) | 3.9-5.6 |
| Urine ketones | Absent (trace) | Expected to be high |
| Serum ammonia | Mildly elevated | Normal |
| ALT/AST | Mildly elevated (2x ULN) | Normal |
| Blood pH | 7.29 | 7.35-7.45 |
| Urine organic acids | Elevated medium-chain acylcarnitines (C6, C8, C10) | Absent normally |
| Acylcarnitine profile (bloodspot) | Elevated octanoylcarnitine (C8) | - |
Questions
Q1. What is the diagnosis?
Answer: Medium-Chain Acyl-CoA Dehydrogenase (MCAD) Deficiency - the most common fatty acid oxidation disorder (FAO defect) in humans. Frequency is approximately 1 in 17,000 in the United States, with higher prevalence in people of Northern European descent. The characteristic presentation is hypoketotic hypoglycemia during fasting or metabolic stress (intercurrent illness, prolonged fasting). - Basic Medical Biochemistry 6e; Goldman-Cecil Medicine
Q2. What is the biochemical defect?
Answer: MCAD is a mitochondrial enzyme that catalyzes the first step of beta-oxidation for medium-chain (C6-C12) fatty acyl-CoA species - the FAD-dependent dehydrogenation step that introduces a trans-double bond.
Normal beta-oxidation pathway:
Long-chain fatty acid → ... → Medium-chain acyl-CoA
↓ MCAD (FAD-dependent)
Trans-2-enoyl-CoA
↓ (continues to acetyl-CoA)
↓
Ketone bodies + Energy (ATP)
In MCAD deficiency, fatty acid oxidation stalls at medium-chain length (C6-C12). The result:
- Medium-chain acyl-CoAs accumulate and are transferred to carnitine → medium-chain acylcarnitines appear in blood and urine (diagnostic marker)
- Impaired ketone body synthesis despite hypoglycemia → hypoketotic hypoglycemia
- Impaired gluconeogenesis (hepatic fatty acid oxidation normally provides energy and acetyl-CoA for gluconeogenesis)
- Liver accumulates unoxidized fatty acids → mild hepatic transaminase elevation - Basic Medical Biochemistry 6e (Harpers/Lieberman)
Q3. Why is this called "hypoketotic" hypoglycemia - and why is this the key clue?
Answer: Normally during fasting, the body activates beta-oxidation of fatty acids to produce ketone bodies (acetoacetate, β-hydroxybutyrate, acetone) as an alternative fuel. In MCAD deficiency, fatty acid oxidation is blocked at medium-chain length, so acetyl-CoA production is severely reduced, and therefore ketone synthesis is impaired despite low blood glucose.
A normal child with hypoglycemia should have elevated urine ketones (the brain switches to ketones). The combination of:
- Low blood glucose + absent/trace urine ketones = hypoketotic hypoglycemia
This is the biochemical fingerprint that distinguishes fatty acid oxidation defects from other causes of hypoglycemia. It also explains why these children deteriorate rapidly during illness - the usual fasting fuel backup (ketones) is unavailable, and glucose is rapidly depleted. - Basic Medical Biochemistry 6e; Harriet Lane Handbook
Q4. What is the genetics of MCAD deficiency?
Answer:
- Autosomal recessive inheritance
- Gene: ACADM (chromosome 1p31)
- Most common mutation: c.985A>T (K304E) - substitution of T for A at position 985 of the ACADM gene, causing a lysine to replace glutamate at position 304 in the protein, resulting in an unstable, dysfunctional enzyme
- The sibling who died suddenly is a clue - MCAD deficiency accounts for a significant proportion of sudden unexpected deaths in infancy/early childhood previously labeled as SIDS - Basic Medical Biochemistry 6e; Thompson & Thompson Genetics 9e
Q5. What diagnostic tests confirm MCAD deficiency?
Answer:
| Test | Finding in MCAD |
|---|---|
| Newborn screening (tandem MS/MS) | Elevated C8-acylcarnitine (octanoylcarnitine) - key marker |
| Urine organic acids | Medium-chain dicarboxylic acids (adipic, suberic, sebacic acid); suberylglycine |
| Plasma acylcarnitine profile | Elevated C8, C6, C10 acylcarnitines |
| Urine acylcarnitines | C6-C10 acylcarnitines elevated |
| Enzyme assay | Reduced MCAD enzyme activity in fibroblasts/lymphocytes |
| DNA analysis | ACADM gene mutation analysis |
Q6. How is MCAD deficiency managed?
Answer:
Acute crisis:
- IV dextrose (10% glucose) urgently to correct hypoglycemia
- Treat the underlying precipitating illness
Long-term:
- Avoid prolonged fasting - the most important preventive measure (no fasting >4-6 hours in infants, >8-10 hours in older children)
- High-carbohydrate, relatively low-fat diet to reduce reliance on fatty acid oxidation
- Uncooked cornstarch at bedtime for overnight fasting prevention
- Carnitine supplementation - controversial but sometimes used to facilitate clearance of acylcarnitine species
- Emergency protocol letter for parents/school
- Newborn screening (tandem MS/MS) is now standard in many countries - early detection is life-saving
Note: The sibling's death highlights the danger of missed diagnosis. MCAD is now routinely screened at birth in most developed countries. - Basic Medical Biochemistry 6e; Goldman-Cecil Medicine
High-Yield Summary Table for MBBS Exams
| Feature | Acute Pancreatitis | Hartnup Disease | MCAD Deficiency |
|---|---|---|---|
| Key defect | Acinar cell injury + trypsin auto-activation | SLC6A19 neutral AA transporter | MCAD enzyme (FAD-dependent) in mitochondria |
| Inheritance | Multifactorial | Autosomal recessive | Autosomal recessive |
| Hallmark lab | Lipase >3x ULN | Neutral aminoaciduria (urine) | C8-acylcarnitinemia; hypoketotic hypoglycemia |
| Classic triad | Pain + elevated enzymes + imaging | Dermatitis + ataxia + neuropsychiatric | Fasting + hypoglycemia + no ketones |
| Most common cause | Gallstones (40-70%) | SLC6A19 mutation | ACADM c.985A>T mutation |
| Key treatment | IV LR fluids + analgesia + diet | Oral nicotinamide + high protein diet | IV dextrose + avoid fasting |
| Dangerous complication | Infected necrosis / ARDS / shock | Rare - chronic neurological decline | Sudden death during fasting/illness |
Sources:
- Robbins & Kumar Basic Pathology
- Rosen's Emergency Medicine, 10e
- Basic Medical Biochemistry: A Clinical Approach, 6e (Lieberman & Bhagavan)
- Andrews' Diseases of the Skin, Clinical Dermatology
- Medical Physiology (Boron & Boulpaep)
- Yamada's Textbook of Gastroenterology, 7e
- Thompson & Thompson Genetics and Genomics in Medicine, 9e
- ACG Guidelines: Management of Acute Pancreatitis (2024) [PMID: 38857482]
- IAP/APA Revised Guidelines on Acute Pancreatitis 2025 [PMID: 40651900]Here is a breakdown of all three cases:
Case 1 - Acute Pancreatitis covers the full clinical scenario of gallstone pancreatitis in a middle-aged woman, with questions on the Atlanta diagnostic criteria, pathophysiology (trypsin auto-activation cascade), severity scoring (Ranson/BISAP/APACHE II/CTSI), management (Lactated Ringer's, no prophylactic antibiotics, ERCP only for cholangitis), and complications including the mechanism of hypocalcemia via fat saponification.
Case 2 - Hartnup Disease covers the pediatric presentation of photosensitive pellagra-like rash + cerebellar ataxia + neuropsychiatric features, the SLC6A19 gene defect and B⁰ transporter mechanism, why plasma amino acids are normal but urine shows neutral aminoaciduria, the tryptophan-to-niacin pathway blockade, and treatment with nicotinamide + high-protein diet.
Case 3 - MCAD Deficiency covers the classic infant with hypoketotic hypoglycemia during fasting/illness, the FAD-dependent beta-oxidation block at medium-chain length, the ACADM c.985A>T mutation, why absent ketones with low glucose is the diagnostic fingerprint, how tandem MS/MS newborn screening (elevated C8-acylcarnitine) detects it, and management by avoiding fasting and IV dextrose during crises.
The summary table at the end is a useful revision tool for the exam. Let me know if you want more cases, MCQs, or deeper detail on any specific topic.
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