Dose-dependent efficacy of β-blocker in patients with chronic heart failure and atrial fibrillation.
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Campodonico Jeness, Piepoli Massimo, Clemenza Francesco, Bonomi Alice, Paolillo Stefania, Salvioni Elisabetta, Corrà Ugo, Binno Simone, Veglia Fabrizio, Lagioia Rocco, Sinagra Gianfranco, Cattadori Gaia, Scardovi Angela B, Metra Marco, Senni Michele, Scrutinio Domenico, Raimondo Rosa, Emdin Michele, Magrì Damiano, Parati Gianfranco, Re Federica, Cicoira Mariantonietta, Minà Chiara, Limongelli Giuseppe, Correale Michele, Frigerio Maria, Bussotti Maurizio, Perna Enrico, Battaia Elisa, Guazzi Marco, Badagliacca Roberto, Di Lenarda Andrea, Maggioni Aldo, Passino Claudio, Sciomer Susanna, Pacileo Giuseppe, Mapelli Massimo, Vignati Carlo, Lombardi Carlo, Filardi Pasquale Perrone, Agostoni Piergiuseppe, MECKI Score Research Group
Аннотация
METHODS AND RESULTS: We analyzed data from HF patients (958 patients (801 males, 84%, age 67 ± 11 years)) with AF enrolled in the MECKI score database. We evaluated prognosis (composite of cardiovascular death, urgent heart transplant, or left ventricular assist device) of patients receiving β-blockers (n = 777, 81%) vs. those not treated with β-blockers (n = 181, 19%). We also analyzed the role β1-selectivity and the role of daily β-blocker dose. To account for different HF severity, Kaplan-Meier survival curves were normalized for relevant confounding factors and for treatment strategies. Dose was available in 629 patients. Median follow-up was 1312 (577-2304) days in the entire population, 1203 (614-2420) and 1325 (569-2300) days in patients not receiving and receiving β-blockers. 224 (23%, 54/1000 events/year), 163 (21%, 79/1000 events/year), and 61 (34%, 49/1000 events/year) events were recorded, respectively. At 10-year patients treated with β-blockers had a better outcome (HR 0.447, p < 0.01) with no effects as regards β1selective drugs (53%) vs. β1-β2 blockers (47%). Survival improved in parallel with β-blocker dose increase (HR 0.296, 0.496, 0.490 for the high, medium, and low dose vs. no β-blockers, p < 0.0001).
CONCLUSION: HF patients with AF taking a β-blocker have a better outcome (with a survival improvement in parallel with daily dose but no differences as regards β1 selectivity) but this does not mean that β-blockers improve outcomes in these patients as we cannot control for all the potential confounders associated with β-blocker use.