Helicobacter pylori infection
The American College of Gastroenterology has published guidelines on the management of H pylori infection. Although they estimate that 30%-40% of the US population may be infected with this pathogen, most patients will be asymptomatic. Testing and treatment is recommended in only certain situations, including patients with a gastric or duodenal ulcer, gastric MALT lymphoma, or uninvestigated dyspepsia in younger patients without other alarming symptoms. Other situations in which testing and treatment may be considered include immune thrombocytopenia, unexplained iron deficiency anemia, and otherwise unexplained vitamin B12 deficiency.
Patients acutely infected with H pylori may be asymptomatic or may present with nonspecific symptoms including abdominal pain, nausea, vomiting, and fever. Symptoms, if present, typically last less than one week. Following acute infection, the majority of patients remain chronically colonized.
Gastrointestinal abnormalities that may result from H pylori infection include chronic diffuse superficial gastritis, gastric ulceration, duodenal ulceration, gastric adenocarcinoma, and gastric lymphoma. The symptoms that patients present with will depend on the specific gastrointestinal pathology that they develop. For example, patients with a duodenal ulcer may present with epigastric pain over the course of a few weeks. The pain is classically worse a few hours after eating. These patients may also complain of melena or hematochezia, as bleeding is a possible complication of ulceration.
Diagnosis can be made by biopsy at the time of upper endoscopy. Noninvasive diagnostic modalities include serology, urea breath test, and stool antigen test.
Treatment is with a combination of a proton pump inhibitor and antimicrobial agents.
B96.81 – Helicobacter pylori [H. pylori] as the cause of diseases classified elsewhere
307759003 – Helicobacter pylori gastrointestinal tract infection
For example, H pylori is associated with duodenal ulceration. Other causes of duodenal ulceration that should be considered in a patient that presents with that pathology are NSAID use or neoplasms.
In a patient presenting with dyspepsia, peptic ulcer disease (which may be caused by H. pylori) is one possible cause, but the differential diagnosis for dyspepsia is extensive and includes gastroesophageal reflux disease, neoplasm, and medications (including NSAIDs). Some patients with dyspepsia (but not all) may benefit from testing for H pylori as described above.