Stress-ulcer prophylaxis: who needs it
- Concept
Very sick ICU patients can bleed from shallow stomach ulcers; acid-reducing medicines help those at highest risk but are not for everyone.
What it is
Stress-related mucosal disease is injury of the stomach lining in critically ill patients, ranging from shallow erosions, which are very common and usually silent, to ulcers that bleed. It is driven mainly by reduced blood flow to the gastric mucosa during shock and critical illness, which weakens the mucus and bicarbonate barrier and lets acid damage the tissue; reperfusion adds further injury. Lesions tend to affect the fundus and body of the stomach. Clinically important bleeding (overt bleeding that changes haemodynamics or needs transfusion) is now uncommon, thanks to better resuscitation and early feeding, but it raises mortality when it happens. Prophylaxis with acid-suppressing drugs lowers the risk of bleeding in high-risk patients, but it may increase the risk of pneumonia and Clostridioides difficile infection and is often continued without reason after the ICU. The key skill is to give it to the right patients, review it daily and stop it when the risk has passed.
Key points
- Erosions appear early in many critically ill patients, but only a small fraction progress to clinically important bleeding.
- Patients on the general ward without ICU risk factors do not need stress-ulcer prophylaxis.
- Enteral nutrition may protect the mucosa by buffering acid and improving blood flow, but it is not a proven substitute for drugs in high-risk patients.
- Antiplatelet and anticoagulant drugs, and high-dose corticosteroids combined with other risks, add to bleeding risk.
How it works
- Shock diverts blood away from the splanchnic circulation, so the gastric mucosa becomes ischaemic and produces less mucus and bicarbonate.
- Hydrogen ions then diffuse back into the damaged mucosa and deepen the injury; reperfusion releases free radicals that add to the damage.
- Raising gastric pH protects against bleeding but also allows bacteria to grow in the stomach, which may be aspirated and cause pneumonia.
- Sucralfate forms a protective coat over the ulcer base without changing pH, but binds other drugs and is less effective at preventing bleeding.
Step by step
- Screen every ICU admission for risk factors on the daily round — prophylaxis is for high-risk patients, not for all.
- Start prophylaxis when ventilation is expected beyond two days, with coagulopathy, or with other major risks — this is where benefit outweighs harm.
- Prefer the enteral route once the gut works and start feeding early — enteral feeding also supports the mucosa.
- Review the indication every day — the risk falls as the patient improves.
- Stop it when the patient is extubated, off vasopressors or leaves the ICU — continued use adds infection risk without benefit.
- Record the indication and stop date on the transfer note — this avoids indefinite use after discharge.
Options and their mechanism
| Option | How it works | Points to weigh |
|---|---|---|
| Proton pump inhibitor | Irreversibly blocks the H+/K+ ATPase of the parietal cell | Most effective at raising pH; possible pneumonia and C. difficile risk |
| H2-receptor antagonist | Blocks histamine on the parietal cell | Tolerance develops; adjust in kidney failure |
| Sucralfate | Coats the ulcer base; no change in pH | Less effective; binds other drugs |
| Early enteral feeding | Buffers acid and supports mucosal blood flow | Helpful but not proven to replace drugs in high risk |
In practice
- Coffee-ground aspirate, haematemesis or melaena with a falling haemoglobin in a ventilated patient suggests stress-related bleeding.
- Treat such bleeding as any upper GI bleed: resuscitate, correct coagulopathy where possible, give intravenous acid suppression and arrange endoscopy.
- Prophylaxis started in the ICU is a common source of unnecessary long-term acid suppression; check it at every transfer.
Next step
- Report overt bleeding (haematemesis, melaena, fresh blood in the tube) with haemodynamic change to a senior at once and request endoscopy.
- Check the stress-ulcer prophylaxis order on the daily checklist and stop it when the risk factors have resolved.
- On ICU discharge, write whether acid suppression should continue and for what reason.
- Watch for diarrhoea and new pneumonia in patients on acid suppression, and test for Clostridioides difficile when indicated.
Test yourself
Think of the answer, then tap the question to see it.
Which two risk factors most strongly predict clinically important stress-ulcer bleeding?
Mechanical ventilation for more than two days and coagulopathy.
What is the main mechanism of stress-related mucosal disease?
Splanchnic hypoperfusion makes the gastric mucosa ischaemic, weakening its mucus and bicarbonate barrier so acid damages it; reperfusion adds injury.
What are the possible harms of stress-ulcer prophylaxis?
A possible increase in hospital-acquired pneumonia and Clostridioides difficile infection, drug interactions, and unnecessary long-term use after discharge.
When should stress-ulcer prophylaxis be stopped?
When the risk has resolved, such as after extubation, once shock has settled or on leaving the ICU, unless another indication exists.
Elsewhere in DurgiPedia
Connections
Educational content; it does not replace supervised training, your institution's protocols or the anaesthetist's or intensivist's decision. It contains no doses and no ventilator or infusion settings.
Sources: Stress-Induced Gastritis (StatPearls (NCBI Bookshelf), 2023); Upper Gastrointestinal Bleeding (StatPearls (NCBI Bookshelf), 2024).
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Representative model, for educational purposes only.