Coronary Artery Bypass Clinical Trial
Official title:
Evaluation of the Efficacy of Different Duration of a Proton Pump Inhibitor in the Prevention of Upper Gastrointestinal Mucosal Injury in Patients Taking 12-month Dual Antiplatelet Therapy After Coronary Artery Bypass Grafting
The purpose of this study is to compare the efficacy and safety for 12- vs. 1-month of pantoprazole treatment in preventing dual antiplatelet therapy (DAPT)-related upper gastrointestinal mucosal injury after coronary artery bypass grafting (CABG). To date, there has been no study using esophagogastroduodenoscopy (EGD) to compare the differences in upper gastrointestinal mucosal injury (including reflux esophagitis) after 6 and 12 months of PPI treatment combined with two different DAPT regimens (clopidogrel plus aspirin or ticagrelor plus aspirin).
This prospective trial was designed as a single-center, open-label, randomized controlled trial with patients allocated in a ratio of 1:1. Within 3 days after CABG, patients willing to participate in the study will be carefully evaluated by a cardiac surgeon together with a gastroenterologist based on inclusion and exclusion criteria. Patients will be followed up to 12 months post-randomization unless death. The outcome will be collected at 2±1 days, 9±2 days, 1 month, 3 months (phone call), 6 months, 9 months (phone call), and 12 months after CABG surgery, respectively. 13C urea breath testing is used to detect Helicobacter pylori (H. pylori) infection before enrollment. At 6 and 12 months post-randomization, routine laboratory tests and EGD will be performed respectively. Computed tomographic angiography (CTA) or coronary angiography (CAG) is also required at 12 months post-randomization. Definition of end of the study 1. The date on which the last subject completed the last follow-up was the endpoint of this study. 2. During the follow-up period, if the patient's biopsy pathological report showed that EGD detects precancerous lesions (e.g., atypical hyperplasia, low-grade or high-grade internal neoplasia, etc.) or malignant lesions. 3. Patients randomized to the control group (1-month pantoprazole treatment group) should continue PPI treatment if GERD-Q questionnaire score 8, endoscopic findings of reflux esophagitis (LA-A and above), gastroduodenal mucosal injury of modified Lanza score of 4, or upper gastrointestinal bleeding at any time during the follow-up period. Following the ITT principle, all patients randomized in this study should be evaluated for primary and secondary endpoints regardless of changes in PPI treatment. Thus, patients in the 1-month pantoprazole treatment group required PPI treatment at any time after 1 month and could also be assessed for primary and secondary endpoints. According to the results of the preliminary study, the cumulative incidence rate of severe gastric and duodenal bulb erosion and ulcers of the 1-month PPI treatment group is assumed to be 36%, and that of the 12-month PPI treatment group was assumed to be 18%. Based on a two-sided α of 0.05 and a randomization ratio of 1:1, a total of 186 subjects are required to provide a power of 80%. Considering a 20% drop-out rate, the sample size of 232 subjects was determined. In this study, all subjects received pantoprazole treatment for at least 1 month after CABG. Due to the COVID-19 pandemic, some subjects are unable to return to the center for study drugs and/or follow-up 1 month after the randomization. Those subjects who are unable to receive subsequent randomization intervention, will be excluded from the modified full analysis set and not included in the effectiveness analysis. Considering the statistical power of the study, randomized subjects will be added until the effective randomized intervention number reaches the predetermined sample size. Two subgroup analyses will be performed in this study, including (1) H. pylori infection: negative and positive; (2) DAPT: aspirin + clopidogrel and aspirin + ticagrelor. ;
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