OBJECTIVES: beta-Blockers are standard therapy for patients with heart failure (HF). This study compared the effects of chronic monotherapy with 2 different beta(1)-selective adrenoceptor blockers, namely atenolol and metoprolol succinate, on left ventricular (LV) function and remodeling in dogs with coronary microembolization-induced HF [LV ejection fraction (EF) 30-40%]. METHODS: Twenty HF dogs were randomized to 3 months of therapy with atenolol (50 mg once daily, n = 6), metoprolol succinate (100 mg, once daily, n = 7) or to no therapy (control, n = 7). LV EF and volumes were measured before initiating therapy and after 3 months of therapy. The change (Delta) in EF and volumes between measurements before and after therapy was calculated and compared among study groups. RESULTS: In controls, EF decreased and end-systolic volume increased. Atenolol prevented the decrease in EF and the increase in ESV. In contrast, metoprolol succinate significantly increased EF and decreased end-systolic volume. DeltaEF was significantly higher and Deltaend-systolic volume significantly lower in metoprolol succinate-treated dogs compared to atenolol-treated dogs (EF: 6.0 +/- 0.86% vs. 0.8 +/- 0.85%, p < 0.05; end-systolic volume: -4.3 +/- 0.81 ml vs. -1 +/- 0.52 ml, p <0.05). CONCLUSIONS: In HF dogs, chronic therapy with atenolol does not elicit the same LV function and remodeling benefits as those achieved with metoprolol succinate. Copyright 2008 S. Karger AG, Basel.
OBJECTIVES: beta-Blockers are standard therapy for patients with heart failure (HF). This study compared the effects of chronic monotherapy with 2 different beta(1)-selective adrenoceptor blockers, namely atenolol and metoprolol succinate, on left ventricular (LV) function and remodeling in dogs with coronary microembolization-induced HF [LV ejection fraction (EF) 30-40%]. METHODS: Twenty HF dogs were randomized to 3 months of therapy with atenolol (50 mg once daily, n = 6), metoprolol succinate (100 mg, once daily, n = 7) or to no therapy (control, n = 7). LV EF and volumes were measured before initiating therapy and after 3 months of therapy. The change (Delta) in EF and volumes between measurements before and after therapy was calculated and compared among study groups. RESULTS: In controls, EF decreased and end-systolic volume increased. Atenolol prevented the decrease in EF and the increase in ESV. In contrast, metoprolol succinate significantly increased EF and decreased end-systolic volume. DeltaEF was significantly higher and Deltaend-systolic volume significantly lower in metoprolol succinate-treated dogs compared to atenolol-treated dogs (EF: 6.0 +/- 0.86% vs. 0.8 +/- 0.85%, p < 0.05; end-systolic volume: -4.3 +/- 0.81 ml vs. -1 +/- 0.52 ml, p <0.05). CONCLUSIONS: In HF dogs, chronic therapy with atenolol does not elicit the same LV function and remodeling benefits as those achieved with metoprolol succinate. Copyright 2008 S. Karger AG, Basel.
Authors: K Watanabe; Y Ohta; M Inoue; M Ma; M I Wahed; M Nakazawa; G Hasegawa; M Naito; K Fuse; M Ito; K Kato; H Hanawa; M Kodama; Y Aizawa Journal: J Cardiovasc Pharmacol Date: 2001-10 Impact factor: 3.105
Authors: Raymond J Gibbons; Jonathan Abrams; Kanu Chatterjee; Jennifer Daley; Prakash C Deedwania; John S Douglas; T Bruce Ferguson; Stephan D Fihn; Theodore D Fraker; Julius M Gardin; Robert A O'Rourke; Richard C Pasternak; Sankey V Williams Journal: J Am Coll Cardiol Date: 2003-01-01 Impact factor: 24.094
Authors: M Komajda; F Follath; K Swedberg; J Cleland; J C Aguilar; A Cohen-Solal; R Dietz; A Gavazzi; W H Van Gilst; R Hobbs; J Korewicki; H C Madeira; V S Moiseyev; I Preda; J Widimsky; N Freemantle; J Eastaugh; J Mason Journal: Eur Heart J Date: 2003-03 Impact factor: 29.983