Helicobacter Pylori Eradication
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Direct answer
Helicobacter pylori eradication cures most peptic ulcers and reduces the risk of gastric cancer, and it requires a confirmed infection, a test performed off acid suppression and a regimen chosen against local resistance. Urea breath test, stool antigen or biopsy-based tests confirm infection, and a 14-day bismuth quadruple regimen is commonly preferred where clarithromycin resistance is high. Test of cure at least four weeks after therapy, with the proton pump inhibitor withheld for about two weeks, confirms eradication.
What you must remember
- Test choice: urea breath test, stool antigen or histology on endoscopic biopsy; serology shows past exposure and cannot confirm cure.
- Bismuth quadruple: a proton pump inhibitor with bismuth, tetracycline and metronidazole for 14 days, preferred where clarithromycin resistance is high.
- Clarithromycin triple: a proton pump inhibitor with clarithromycin and amoxicillin for 14 days, which is unreliable where clarithromycin resistance is common.
- Penicillin allergy: metronidazole or a fluoroquinolone-based alternative replaces amoxicillin in regimens, guided by local susceptibility data.
- Rescue therapy: after failure, susceptibility testing where available guides a levofloxacin-based or other regimen, after checking adherence and dosing.
- Malignancy links: gastric adenocarcinoma and gastric mucosa-associated lymphoid tissue lymphoma, which can regress after eradication; the IARC classifies the organism as a Group 1 carcinogen.
- Test of cure: at least four weeks after antibiotics, with the proton pump inhibitor withheld for about two weeks beforehand.
Treating a duodenal ulcer and a gastric lymphoma
A 50-year-old man with a duodenal ulcer is biopsied at endoscopy, and histology shows H pylori.
- Start bismuth quadruple therapy: A 14-day course is started, and he is warned about black stool from bismuth, metallic taste and the need to avoid alcohol with metronidazole.
- Check adherence and plan the test: Adherence is checked at the midpoint, and a urea breath test is planned at about four weeks, with the proton pump inhibitor stopped two weeks earlier.
- Eradicate for gastric lymphoma: A 60-year-old with localised low-grade gastric mucosa-associated lymphoid tissue lymphoma is treated with eradication as the first step, because such lymphomas can regress once the infection is cleared. Follow-up endoscopy with biopsy determines whether further therapy is needed.
- Review drug interactions: Clarithromycin raises the levels of several drugs, including statins and warfarin, so clarithromycin-based regimens need a careful medication review.
- Match the regimen to resistance: The decision to eradicate follows the diagnosis, while the choice of regimen follows local resistance and the patient's allergies.
Where the exam tries to catch you
Four traps recur on this topic.
- Trap: a urea breath test on a patient still taking a proton pump inhibitor Correct: it can show a false negative and falsely suggest eradication, so the drug is withheld beforehand.
- Trap: clarithromycin triple therapy as the default Correct: where clarithromycin resistance is high, bismuth quadruple therapy is commonly preferred.
- Trap: mistaking bismuth black stool for melaena Correct: bismuth causes black stool, which can be mistaken for melaena and lead to an unnecessary endoscopy.
- Trap: choosing chemotherapy for gastric MALT lymphoma Correct: eradication is the first treatment for localised low-grade disease, not chemotherapy.
Indian examinations often test whether candidates know that local resistance data should shape the regimen.
Frequently asked questions
Which breath test is preferred to confirm Helicobacter pylori eradication?
The urea breath test is a preferred non-invasive method to confirm Helicobacter pylori eradication, performed at least four weeks after antibiotics. The proton pump inhibitor must be withheld for about two weeks beforehand, because it can make the test falsely negative.
What is the commonly preferred regimen for Helicobacter pylori eradication in India?
A 14-day bismuth quadruple regimen, combining a proton pump inhibitor, bismuth, tetracycline and metronidazole, is commonly preferred where clarithromycin resistance is high. Local antibiotic resistance data should guide the choice, since clarithromycin-based triple therapy is less reliable in such settings.
Which malignancies are linked to Helicobacter pylori infection?
Helicobacter pylori is linked to gastric adenocarcinoma and to gastric mucosa-associated lymphoid tissue lymphoma, which can regress after eradication. The International Agency for Research on Cancer classifies the organism as a Group 1 carcinogen.
What should be done when first-line Helicobacter pylori eradication fails?
Failure of first-line eradication calls for a rescue regimen guided by susceptibility testing where available, often a levofloxacin-based regimen. Adherence, dosing and proton pump inhibitor timing should be checked before the therapy is escalated.