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The role of β-blockers in preventing cardiovascular complications of non-cardiac surgery is controversial. Early enthusiasm was dampened by accumulating trial data and concerns about the scientific validity of several trials. When studies with uncertain validity are excluded, meta-analyses of randomised trials show that perioperative β-blockers (started within 1 day before surgery) prevent postoperative myocardial infarction (MI), but increase the risks of stroke and death.1 This Danish nationwide cohort study evaluated the association of long-term preoperative β-blocker treatment with mortality and cardiac morbidity after non-cardiac surgery in patients with uncomplicated hypertension.
Population-based healthcare databases were used to conduct …
Contributors DNW prepared the first draft of this paper, revised it for important intellectual content, and is the guarantor.
Competing interests None declared.
Provenance and peer review Commissioned; internally peer reviewed.