Cardiovascular Outcomes Following Major Gastrointestinal Bleeding in Patients With Pre-Existing Cardiovascular Disease: The INTERBLEED International Prospective Cohort Study

BACKGROUND & AIMS: Gastrointestinal bleeding (GIB) is common in patients with cardiovascular (CV) disease, but a complete understanding of subsequent outcomes is unknown. We assessed outcomes after GIB in patients with CV disease. METHODS: INTERBLEED is an international multicenter prospective study comparing adults with CV disease (coronary or peripheral arterial disease, heart failure, atrial fibrillation, cerebrovascular disease, or venous thromboembolic disease) with GIB to those without. Outcomes included major adverse cardiovascular events (MACE; myocardial infarction, stroke, or CV-related death), all-cause death, and recurrent GIB at 12 months. Multivariable regression modelling yielded odds ratios (ORs) with 95% confidence intervals (CIs), and reverse Kaplan-Meier curves were created. RESULTS: A total of 3814 patients were enrolled: 1612 patients with GIB and 2202 without. On multivariable analyses, patients with CV disease experiencing GIB were more likely to die within 12 months (OR, 2.29; 95% CI, 1.24-4.19). GIB was associated with recurrent GIB (OR, 4.28; 95% CI, 2.80-6.53) but not MACE. However, resumption of antithrombotic therapy between 4 and 7 days (OR, 0.37; 95% CI, 0.17-0.83) or 8 and 30 days (OR, 0.37; 95% CI, 0.17-0.81) after GIB were associated with lower odds of MACE within 12 months compared with discontinuation or lack of resumption within 60 days. Any antithrombotic use after enrollment was associated with lower all-cause death (OR, 0.45; 95% CI, 0.28-0.71). Neither antithrombotic use nor early resumption was associated with higher odds of recurrent GIB. CONCLUSIONS: GIB in patients with CV disease is independently associated with subsequent morbidity and mortality. Patterns in antithrombotic resumption were associated with outcomes. Further research into optimal antithrombotic management after GIB is essential.