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Timing of pre-operative Beta-blocker treatment in vascular surgery patients influence on post-operative outcome.
J Am Coll Cardiol. 2010 Nov 30;56(23):1922-9
Authors: Flu WJ, van Kuijk JP, Chonchol M, Winkel TA, Verhagen HJ, Bax JJ, Poldermans D
OBJECTIVES: This study evaluated timing of ?-blocker initiation before surgery and its relationship with: 1) pre-operative heart rate and high-sensitivity C-reactive-protein (hs-CRP) levels; and 2) post-operative outcome. BACKGROUND: Perioperative guidelines recommend ?-blocker initiation days to weeks before surgery, on the basis of expert opinions. METHODS: In 940 vascular surgery patients, pre-operative heart rate and hs-CRP levels were recorded, next to timing of ?-blocker initiation before surgery (0 to 1, >1 to 4, >4 weeks). Pre- and post-operative troponin-T measurements and electrocardiograms were performed routinely. End points were 30-day cardiac events (composite of myocardial infarction and cardiac mortality) and long-term mortality. Multivariate regression analyses, adjusted for cardiac risk factors, evaluated the relation between duration of ?-blocker treatment and outcome. RESULTS: The ?-blockers were initiated 0 to 1, >1 to 4, and >4 weeks before surgery in 158 (17%), 393 (42%), and 389 (41%) patients, respectively. Median heart rate at baseline was 74 (±17) beats/min, 70 (±16) beats/min, and 66 (±15) beats/min (p < 0.001; comparing treatment initiation >1 with <1 week pre-operatively), and hs-CRP was 4.9 (±7.5) mg/l, 4.1 (±.6.0) mg/l, and 4.5 (±6.3) mg/l (p = 0.782), respectively. Treatment initiated >1 to 4 or >4 weeks before surgery was associated with a lower incidence of 30-day cardiac events (odds ratio: 0.46, 95% confidence interval [CI]: 0.27 to 0.76, odds ratio: 0.48, 95% CI: 0.29 to 0.79) and long-term mortality (hazard ratio: 0.52, 95% CI: 0.21 to 0.67, hazard ratio: 0.50, 95% CI: 0.25 to 0.71) compared with treatment initiated <1 week pre-operatively. CONCLUSIONS: Our results indicate that ?-blocker treatment initiated >1 week before surgery is associated with lower pre-operative heart rate and improved outcome, compared with treatment initiated <1 week pre-operatively. No reduction of median hs-CRP levels was observed in patients receiving ?-blocker treatment >1 week compared with patients in whom treatment was initiated between 0 and 1 week before surgery.
PMID: 21109115 [PubMed - in process]