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Review article: gastrointestinal bleeding with low-dose aspirin - what s the risk?Laine LAliment Pharmacol Ther 2006[Sep]; 24 (6): 897-908This review examines ulcers and gastrointestinal bleeding with low-dose aspirin, focusing on randomized placebo-controlled trials. The single endoscopic trial assessing ulcers showed no significant difference in 12-week ulcer incidence: 6% of 381 given placebo vs. 7% of 387 given 81 mg enteric-coated aspirin. The relative risk of major gastrointestinal bleeding with low-dose aspirin in a meta-analysis of placebo-controlled trials of vascular protection was 2.07 (95% CI: 1.61-2.66). The absolute rate increase with aspirin above placebo was 0.12% per year (95% CI: 0.07-0.19%) with a number-needed-to-harm of 833 patients (95% CI: 526-1429). A meta-analysis of aspirin 50-1500 mg daily reported an odds ratio for any gastrointestinal bleeding of 1.68 (95% CI: 1.51-1.88) with an number-needed-to-harm at 1 year of 247. The relative risk of hospitalization for upper gastrointestinal bleeding with low-dose aspirin in a large Danish cohort study was 2.6 (95% CI: 2.2-2.9) with an absolute annual incidence of 0.6%. Factors that may increase the risk of gastrointestinal bleeding include prior history of ulcers or gastrointestinal bleeding, corticosteroid use, anticoagulant therapy and addition of a non-aspirin non-steroidal anti-inflammatory drug. When determining whether low-dose aspirin is appropriate for an individual patient, the cardiovascular benefit must be weighed against the potential for clinical events such as gastrointestinal bleeding.|Adrenal Cortex Hormones/adverse effects[MESH]|Aging/physiology[MESH]|Anti-Inflammatory Agents, Non-Steroidal/adverse effects[MESH]|Anticoagulants/adverse effects[MESH]|Aspirin/administration & dosage/*adverse effects[MESH]|Cardiovascular Diseases/prevention & control[MESH]|Cyclooxygenase 2 Inhibitors/adverse effects[MESH]|Drug Administration Schedule[MESH]|Gastrointestinal Diseases/*chemically induced[MESH]|Gastrointestinal Hemorrhage/chemically induced[MESH]|Humans[MESH]|Randomized Controlled Trials as Topic[MESH]|Risk Factors[MESH]|Ulcer/chemically induced[MESH]|Warfarin/adverse effects[MESH] |
