Background: In esophagus whether antiplatelet drugs, such as low-dose aspirin (LDA) and clopidogrel, induce mucosal injury by pH changes or by acid reflux is unclear. We designed to clarify which mechanism was responsible.
Methods: In study 1, 80 patients taking LDA and 80 age- and sex-matched subjects who underwent endoscopy for dyspeptic symptoms or for a health check-up were evaluated the endoscopic incidence of esophageal mucosal injury and severity. In study 2, 35 healthy subjects were treated with LDA 100 mg (regimen A), and then 20 randomly selected subjects were dosed clopidogrel 75 mg (regimen C), LDA/clopidogrel (regimen AC), or LDA/clopidogrel/rabeprazole 10 mg for 7 days. Subjects underwent endoscopy and 24-hour pH measurements on day 7.
Results: In study 1, the prevalence of esophageal injury in LDA patients was 40.0%, significantly higher than in non-LDA subjects (25.0%, p = 0.042). In study 2, significant increases in incidence of injury were observed with regimens A (45.8%) and AC (50.0%), but not with C (20.0%), on day 7. Among subjects in whom pH was >5.0 and <4.0 for less than 40% of time, none developed esophageal injury.
Conclusions: LDA caused esophageal injury in half of patients and volunteers. Acid-inhibitory drugs effectively prevented the development of LDA-induced, not clopidogrel, esophageal injury.
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