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Updated: Aug 18, 2026

Quantitative Polymerase Chain Reaction (qPCR)-Based Rapid Diagnosis of Helicobacter pylori Infection and Antibiotic Resistance
Published on: July 28, 2023
Carditis: all Helicobacter pylori or is there a role for gastro-oesophageal reflux?
D McNamara1, M Buckley, P Crotty
1Adelaide and Meath Hospital, Trinity College, Dublin, Ireland. dimac1@indigo.ie
Insights
Helicobacter pylori infection is strongly linked to carditis and cardia intestinal metaplasia (CIM) in dyspeptic individuals. Gastro-oesophageal reflux disease showed no association with these conditions.
Area of Science:
- Gastroenterology
- Pathology
Background:
- Epidemiological studies show a threefold increase in lower oesophageal and cardia adenocarcinoma.
- Conflicting data exists on the roles of gastro-oesophageal reflux disease (GERD) and Helicobacter pylori (H. pylori) in carditis and cardia intestinal metaplasia (CIM).
- Evidence suggests GERD and H. pylori are inversely related, complicating etiological understanding.
Purpose of the Study:
- To determine the prevalence of carditis and CIM in dyspeptic subjects.
- To investigate the association of carditis and CIM with H. pylori infection.
- To examine the association of carditis and CIM with GERD.
Main Methods:
- Histological samples of the gastric cardia were obtained from 276 dyspeptic subjects.
- H. pylori status was determined through histological, microbiological, and rapid urease testing.
- GERD was diagnosed based on histological evidence and/or erosive oesophagitis.
Main Results:
- Carditis was present in 59% (163/276) and CIM in 13% (36/276) of subjects.
- H. pylori infection was found in 23% (64/276) and GERD in 54% (150/276).
- H. pylori infection showed a strong association with carditis (P<0.001) and CIM (P<0.01). Older age and male gender were also associated with carditis and CIM. GERD was not associated with either condition.
Conclusions:
- Carditis and CIM are frequent findings in dyspeptic patients.
- H. pylori infection is significantly associated with both carditis and CIM.
- No association was found between gastro-oesophageal reflux disease and carditis or CIM.
Background:
Recent epidemiological studies have reported a threefold increase in the incidence of adenocarcinoma of the lower oesophagus and gastro-oesophageal junction (cardia). There are conflicting reports available implicating both gastro-oesophageal reflux disease and Helicobacter pylori infection in the aetiology of carditis and cardia intestinal metaplasia, despite strong evidence to show that these two conditions are, if anything, inversely related. We aimed to determine the prevalence of carditis and cardia intestinal metaplasia in dyspeptic subjects and also their association with H. pylori infection and gastro-oesophageal reflux disease.
Method:
Histological samples from the gastric cardia were obtained from dyspeptic subjects. H. pylori status was assessed based on histological, microbiological and rapid urease testing. Gastro-oesophageal disease was diagnosed on the basis of histological evidence and/or erosive oesophagitis. Patient demographics were recorded. Cardia intestinal metaplasia (CIM), when present, was subgrouped as complete or incomplete.
Results:
Overall, 276 subjects were enrolled; 163 (59%) had carditis and 36 (13%) CIM. H. pylori infection and gastro-oesophageal reflux disease occurred in 64 (23%) and 150 (54%), respectively. H. pylori infection was strongly associated with carditis and CIM (P<0.001 and P<0.01). Older age and male gender were also associated with inflammation and intestinal metaplasia of the cardia. Gastro-oesophageal reflux was not associated with either entity.
Conclusion:
Carditis and CIM occur frequently. Both conditions are strongly associated with H. pylori infection, older age and male gender. There was no association with gastro-oesophageal reflux disease.
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