JC59 (Medicine) - Peptic ulcer, Gallstones, Pancreatitis Flashcards
Ddx GI causes of epigastric pain
Gastroduodenal
- Peptic ulcer
- Atypical GERD
- Gastric cancer
Hepatobiliary:
- Pancreatitis
- Gallstones
- Pancreatic cancer
Functional dyspepsia (*60%)
Ddx non-GI causes of epigastric pain
Cardiac: MI, myocarditis, ACS…etc
Chest: Pneumothorax, PE…etc
Haematological: Acute leukaemia, hemolytic anaemia..etc
Metabolic: Uremia, DM, porphyria, Addision’s
Toxin: lead poisoning, hypersensitivity
Infections: Herpes zoster (shingles)
Neurological: radiculitis, tabes dorsalis
Misc: muscular contusion, narcotic withdrawal, psychiatric disorders..etc
Differentiate the likely organs involved in constant vs Colicky vs episodic/ plateau epigastric pain
Constant moderate pain - likely ulcers
Colicky - likely intestinal or renal colic
Episodic/ plateau - likely biliary colic/ pancreatic pain
Ddx acute epigastric pain radiating to back
Biliary pain
Acute pancreatitis
Dissecting aortic aneurysm
Posteriorly penetrating PU
Ddx epigastric pain with repeated vomiting
Food poisoning/ gastroenteritis
Acute pancreatitis
Gastric outlet obstruction
Ddx agonizing, generalized abdominal pain
Mesenteric thrombosis
Ischemic colitis
Peritonitis
Perforated acute pancreatitis
Alarming features of acute epigastric pain
Age: >45 years old
Constitutional symptoms: Anaemia/ bleeding, Unintentional weight loss, Anorexia, lymphadenopathy
Alarming S/S
- Early satiety
- Abdominal mass
- Jaundice
- Dysphagia or odynophagia
- Persistent vomiting
PMH:
- Upper GI cancer
- Ulcers
Family history: upper GI cancer
Peptic ulcers
- Specify possible locations of ulceration
Gastric ulcer (20%) - usu. at lesser curvature and corpus-antrum junction
Duodenal ulcer (75%) - usu. solitary D1 if no NSAID use
Esophageal ulcer
Merkel’s diverticulum (ectopic epithelium)
Anastomotic ulcer/ Stoma opening (gastroenterostomy)
Peptic ulcer complications and S/S
Ulcer complications: ‘bleed’, ‘burst’, ‘block’ and ‘burrow’ (fistulization to other organs)
→ Bleeding: symptomatic UGIB, anaemia
→ Perforation: abrupt severe epigastric pain secondarily generalized, fever, shock
→ Gastric outlet obstruciton: nausea, vomiting (of old food >1h), epigastric distension
Peptic ulcer
- Aetiologies
H. pylori infection: 92% DU, 70% GU
NSAIDs: 5% DU, 25% GU
Stress, ICU setting esp if mechanical ventilation or coagulopathy
Zollinger-Ellison syndrome (gastrinoma, G cell hyperplasia)
→ Features: hypergastrinaemia + ulcers at atypical location
Smoking
Drugs: alcohol, antiplatelets, steroids
Crohn’s Disease
Pathogenesis of stress peptic ulcers
Stress ulcers are due to biliary reflux, uraemic toxins and impaired perfusion to stomach, leading to impairment of mucosal protection of stomach
H. pylori
- Pathophysiology of gastric mucosa inflammation
Pathology: Expresses certain cytotoxins to provoke gastritis in underlying epithelium
Antral gastritis (majority) → ↓somatostatin, ↑gastrin release → ↑acid production → DU ± GU
Pangastritis (minority, 1%) → chronic atrophic gastritis ± GU → hypochlorhydria → proliferation of other bacteria → mutagenic nitrites → ↑risk of CA stomach
H.pylori
- Gram stain, morphology
- Survival mechanism in stomach
- Transmission
- Risk factors of infection
Bacteriology: G- bacilli, spiral w/ unipolar flagella
→ Resides in mucus layer overlying mucosa where pH is~7
→ Expresses urease to convert urea into ammonia + bicarbonate → counteract stomach acidity
Transmission: unknown, likely person-to-person contact via oro-oral or feco-oral route
RFs: unclean water supply, poor sanitary conditions, crowded environment, ↓socio-economic status
H. pylori-associated diseases
Dyspepsia, chronic gastritis, PUD (GU/DU) Gastric adenocarcinoma, MALT lymphoma Extra-GI: anaemia (due to B12 or Fe def)
Diagnostic tests for H. pylori infection
Which tests used for post-treatment monitoring
Invasive endoscopic tests: 3 biopsies at antrum/ proximal stomach
- Rapid urease test (CLO test)
- Biopsy for histology
- Culture for S/T
Non-invasive: Whole blood/ serum test for antibodies (Specific IgG) Urine antibody Stool antigen Urea breath test with C-13 isotope
Stool antigen and urea breath test are used for post-treatment monitoring
Mechanism of rapid urease test/ CLO test
Rapid urease test (CLO test): sens 90%, spec 95%
→ Bx sample added to a solution of urea + phenol red
→ urease-positive H. pylori will hydrolyze urea into NH3 + CO2
→ ↑pH turns phenol red from yellow to pink
→ usually read at 1h and 4h (85% will change colour ≤1h)
Treatment regimens of H. pylori infection
Triple therapy: PPI + amoxicillin + clarithromycin bi-daily ×7d
Bismuth quadruple therapy: PPI + bismuth + tetracycline + metronidazole
Non-bismuth quadruple therapy: PPI + amoxicillin + clarithromycin + Metronidazole
Indication for Bismuth-containing quadruple therapy
Dual clarithromycin and metronidazole resistance (>15%)
Post H pylori treatment monitoring
NON-invasive tests, eg. stool antigen tests, urea breath tests
Pathogenesis of NSAID-related peptic ulcer
Pathology:
Impair gastric mucosa defense:
- Block prostaglandin production
- Block bi-carbonate and mucus production
> > Impair mucus layer, lowers pH and increase susceptibility of gastric acid and pepsin attack
pH dependent gastric mucosal damage
NSAID-related peptic ulcer
Risk factors: patient factors and drug factors
Patient factors:
- Age >60y
- Hx of PUD or UGI complications
Drug-related factors:
- ↑COX-1 selectivity
- High dose or concurrent use
- Concurrent anticoagulants or steroids
Which NSAIDs cause most peptic ulcer
Which cause the least
Most PU:
Aspirin, Ketoprofen, Etodolac, Piroxicam
Least PU:
Fenoprofen, Diclofenac, Naproxen
Prevention of NSAID-related peptic ulcer
Prevention:
→ Review meds: review indications for NSAIDs, consider switching to less ulcerogenic NSAIDs or COX-2 inhibitor
→ Prior H. pylori testing ± eradication
→ Co-therapy by PPI, H2 receptor antagonist, misoprostol (Prostaglandin analogue)
Prevention of aspirin related GI complications
H. pylori eradication
H2 receptor antagonist, PPI, Misoprostol use
Substitute aspirin with Clopidogrel
Clinical features of peptic ulcer
Differentiating S/S between gastric ulcer and duodenal ulcers
Dyspepsia (80%): variable discomfort at epigastrium ± radiation
- ulcer-like (burning/gnawing pain) or
- dysmotility-like (bloating, early satiety, anorexia, nausea)
Pain localizes to epigastrium, related to food and episodic
GU vs DU:
- GU is exacerbated by eating vs DU relieved by eating → corresponding weight changes
- DU a/w pain at night and 2-3 hours after eating vs GU pain during eating
Diagnostic investigations of peptic ulcer disease
Management plan of uncomplicated PUD
OGD with biopsy:
- Diagnotic: Biopsy to confirm PUD, r/o malignancy, H. pylori testing
- Therapeutic: stop ulcer bleeding
Mx of underlying cause:
→ H. pylori eradication therapy as above
→ Avoid NSAIDs, stop smoking and limit alcohol intake
Antisecretory therapy: PPI
Re-scope at 6mo for GU to detect non-healing ulcers
Management plan of refractory/ complicated PUD
Surgical therapy for refractory or complicated ulcers: lower risk of malignancy
→ GU: ulcer excision, eg. partial gastrectomy + Bilroth I (or II) reconstruction
→ DU: acid-reducing procedures, eg. truncal vagotomy + pyloroplasty