A 69-year-old gentleman is admitted after repeatedly vomiting bright red blood over several hours. He has underlying obesity-related liver disease, type 2 diabetes, and hypertension. His initial rectal exam shows hard stool in the rectum with a smear of foul-smelling black stool. He is hypotensive (86/54 mmHg) and tachycardic (106 bpm). Blood tests show severe anaemia and elevated urea.
He is stabilised as a suspected variceal bleeder and undergoes emergency endoscopy. Ongoing bleeding leads to placement of a TIPS (transjugular intrahepatic portosystemic shunt). Bleeding settles.
The next morning in the ICU, nursing staff note he is very confused and slow to respond. Neurological examination is normal except for a coarse, low-frequency tremor when he extends his hands. His repeat blood tests show no major deterioration.
What is the most appropriate next step?
A. Arrange urgent non-contrast CT head
B. Start broad-spectrum intravenous antibiotics
C. Organise urgent repeat endoscopy
D. Administer a rectal phosphate enema and start regular laxatives
E. Continue to observe without intervention
Correct answer: D. Administer a rectal phosphate enema and start regular laxatives
Detailed Explanation
This patient has recently undergone TIPS placement to control severe variceal bleeding. Although TIPS decreases portal pressure, it also diverts ammonia-rich portal blood away from the liver. In cirrhosis, the liver is already poor at detoxifying ammonia; bypassing it makes things worse. The resulting rise in ammonia can precipitate hepatic encephalopathy (HE).
Clues strongly suggest HE:
- Recent TIPS → high risk of post-TIPS encephalopathy
- New confusion, reduced alertness
- Asterixis (3–5 Hz tremor/flap)
- No signs of rebleeding: Hb improved, urea decreased, no reported haematemesis
- No fever or marked inflammatory response to suggest infection
- No focal neurological deficit → CT head unlikely to show a structural lesion
The trigger for HE in this patient is very likely constipation, noted on the initial rectal examination. When stool stagnates, colonic bacteria generate more ammonia → worsens encephalopathy.
The cornerstone of HE treatment is:
- Clearing ammonia from the bowel
- Enema for immediate evacuation
- Laxatives (e.g., lactulose) to maintain 2–3 soft stools/day
- Avoid unnecessary tests unless red flags arise.
Therefore, a phosphate enema plus regular laxatives is the right next step.
Why the other options are wrong:
CT Head
No focal deficits, no trauma, typical HE features → CT won’t change management now.
Antibiotics
Infection can trigger HE, but inflammatory markers are improving, no fever, and TIPS-related HE is more likely.
Repeat Endoscopy
No evidence of rebleeding; haemoglobin has improved.
Observation Only
Incorrect because constipation must be reversed promptly to lower ammonia.
Cheat Sheet (Exam-Focused)
TIPS → high risk of hepatic encephalopathy (HE)
- Mechanism: diverted portal blood bypasses liver → ammonia accumulates
- Key signs: confusion, drowsiness, asterixis
- Main triggers: constipation, infection, GI bleed, electrolyte imbalance
- Diagnosis: clinical; CT brain rarely indicated unless atypical
- Treatment goals: reduce ammonia load
Management of HE
- Immediate: evacuate bowel (phosphate enema if constipated)
- Maintenance: lactulose ± rifaximin
- Target: 2–3 soft stools/day
- Correct triggers (K+, infection, bleeding)
- Protein restriction not routinely recommended
Variceal bleed acute management
- ABC + resuscitation
- Terlipressin
- IV antibiotics (quinolones)
- Endoscopic banding
- TIPS if bleeding uncontrolled
Common Post-TIPS Complication:
- Hepatic encephalopathy (up to 30–35%)
Flashcards (20 Cards)
1. Q: What major complication occurs after TIPS placement?
A: Hepatic encephalopathy.
2. Q: What biochemical substance accumulates in HE?
A: Ammonia.
3. Q: Classic physical sign of HE?
A: Asterixis (flapping tremor).
4. Q: Most common precipitant of HE in hospital?
A: Constipation.
5. Q: First-line therapy for HE with faecal impaction?
A: Enema + laxatives.
6. Q: What is the lactulose target?
A: 2–3 soft stools daily.
7. Q: Why does TIPS cause HE?
A: Bypasses liver → decreased ammonia clearance.
8. Q: Is CT head useful for diagnosing HE?
A: No—diagnosis is clinical unless atypical.
9. Q: What endoscopic therapy is preferred for variceal bleeds?
A: Variceal band ligation.
10. Q: What vasoactive drug is used in variceal bleeding?
A: Terlipressin.
11. Q: Why give antibiotics in variceal bleeding?
A: Reduces mortality in cirrhotics.
12. Q: Which antibiotic class is commonly used?
A: Quinolones.
13. Q: What is a key lab marker of GI bleed severity?
A: Elevated urea.
14. Q: What is portal hypertension?
A: Increased pressure in the portal venous system.
15. Q: Why does portal hypertension cause varices?
A: Blood diverts through collateral veins.
16. Q: Name two triggers of HE other than constipation.
A: Infection, GI bleed.
17. Q: Main symptom of overt HE?
A: Altered mental status.
18. Q: What part of neuro exam remains normal in HE?
A: Focal neurological deficits are absent.
19. Q: When is repeat endoscopy indicated?
A: Signs of rebleeding.
20. Q: When to start antibiotics post-TIPS?
A: Only if infection is suspected.
MCQs (With Answers & Explanations)
1. After TIPS, a patient becomes confused with a flapping tremor. What is the best initial intervention?
A. CT head
B. Lactulose + bowel clearance
C. Repeat endoscopy
D. Mannitol
E. Withhold all protein
Answer: B
Classic post-TIPS hepatic encephalopathy; treat by reducing bowel ammonia.
2. Which factor most strongly precipitates hepatic encephalopathy?
A. Hypercalcaemia
B. Constipation
C. Beta-blocker therapy
D. Low ALT
E. High albumin
Answer: B
Constipation increases ammonia absorption.
3. What is the mechanism of TIPS-induced encephalopathy?
A. Decreased liver size
B. Portal blood bypasses hepatic detoxification
C. Excess aldosterone
D. Splenic sequestration
E. Portal vein thrombosis
Answer: B
4. Which sign supports rebleeding after variceal therapy?
A. Lowering urea
B. Improved haemoglobin
C. Fresh haematemesis
D. Normal vitals
E. No melena
Answer: C
5. What is the preferred endoscopic therapy for variceal bleeding?
A. Sclerotherapy
B. Balloon tamponade
C. Band ligation
D. Adrenaline injection
E. ERCP
Answer: C
SummaryÂ
A patient who undergoes TIPS for variceal bleeding is at high risk of developing hepatic encephalopathy because portal blood bypasses the liver, reducing its ability to clear ammonia. The resulting hyperammonemia leads to confusion, reduced consciousness, and asterixis. Constipation is one of the strongest precipitants because retained stool increases ammonia production by gut bacteria. This makes bowel clearance a critical therapeutic step. In this scenario, the patient’s new confusion, presence of an asterixis-like tremor, improving haemoglobin, decreasing urea, and absence of fever all strongly indicate TIPS-related encephalopathy rather than rebleeding or infection. CT brain is unnecessary unless focal neurological signs or trauma are present. Antibiotics are not indicated unless clinical or laboratory evidence supports infection. Repeat endoscopy is not required without signs of recurrent bleeding. The best management strategy is to evacuate the bowel immediately using a phosphate enema and initiate regular laxatives such as lactulose to maintain two to three soft stools per day. Hepatic encephalopathy is largely reversible when precipitating factors are addressed. Variceal bleeding is managed initially with resuscitation, terlipressin, prophylactic antibiotics, and endoscopic band ligation, with TIPS reserved for ongoing bleeding. Post-TIPS monitoring is essential to detect complications early. Understanding the link between portal hypertension, nitrogenous waste handling, and neurocognitive dysfunction is key to managing these patients effectively. Continuous vigilance for triggers—constipation, infection, GI bleeding, dehydration, and electrolyte abnormalities—prevents recurrence. With timely bowel clearance, most patients improve rapidly.