Abstract
Background
Although a third of gastroesophageal reflux disease (GERD) patients are refractory to proton pump inhibitor (PPI) therapy, the underlying mechanism of the refractoriness remains unclear. We compared the level of gastric acid suppression during PPI treatment between responders and non-responders by directly measuring gastric acid secretion in GERD patients taking PPIs.
Methods
Seventy-five consecutive patients receiving standard-dose PPI therapy for GERD were prospectively recruited, irrespective of persistent GERD symptoms. They were asked about their GERD symptoms using a validated questionnaire, and simultaneously underwent both a routine endoscopic examination and a gastric acid secretory testing using an endoscopic gastrin test. Associations between residual gastric acid secretion during PPI treatment and persistent GERD symptoms were analyzed by a logistic regression analysis.
Results
Overall, 26 of 75 (34.7%) patients were judged to be positive for persistent GERD symptoms. The patients with and without persistent symptoms showed similar gastric acid secretion levels (1.3 [1.3] mEq/10 min vs. 1.4 [2.0] mEq/10 min). Sufficient gastric acid suppression, defined as < 0.6, was not significantly associated with persistent GERD symptoms (odds ratio 1.1, 95% confidence interval 0.40–3.5).
Conclusions
This study provided solid evidence to support that the gastric acid suppression level during PPI treatment does not differ between patients with and without persistent GERD symptoms. The insignificant role of residual gastric acid in the persistent GERD symptoms suggests that the use of medications other than those that enhance gastric acid inhibitory effects would be an essential approach for the management of PPI-refractory GERD.
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Abbreviations
- CI:
-
Confidence interval
- EGT:
-
Endoscopic gastrin test
- ERD:
-
Erosive reflux disease
- GERD:
-
Gastroesophageal reflux disease
- HH:
-
Hiatal hernia
- NERD:
-
Non-erosive reflux disease
- OR:
-
Odds ratio
- PPI:
-
Proton pump inhibitor
- SD:
-
Standard deviation
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Ethical Statement
The study protocol was approved by the Tohoku University Hospital Ethics Committee (2014-2-136), and all subjects provided their written informed consent prior to enrollment.
Conflict of interest
Masamune A received lecture fees from EA Pharma Co., Ltd., Takeda Pharmaceutical Co., Ltd., Daiichi Sankyo Co., Ltd, and received Commercial research funding from Otsuka Pharmaceutical Co., EA Pharma Co., Ltd., Takeda Pharmaceutical Co., Ltd., Daiichi Sankyo Co., Ltd., Eisai Co., Ltd.; Iijima K received lecture fees from Otsuka Pharmaceutical Co., Ltd., Takeda Pharmaceutical Co., Ltd., Daiichi Sankyo Co., Ltd., and received Commercial research funding from Otsuka Pharmaceutical Co., Ltd., EA Pharma Co., Ltd., Takeda Pharmaceutical Co., Ltd., and Daiichi Sankyo Co., Ltd.
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Kikuchi, H., Fukuda, S., Koike, T. et al. Association of residual gastric acid secretion with persistent symptoms in gastroesophageal reflux disease patients receiving standard-dose proton pump inhibitor therapy. Esophagus 18, 380–387 (2021). https://doi.org/10.1007/s10388-020-00765-2
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DOI: https://doi.org/10.1007/s10388-020-00765-2