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Relative bradycardia (mild sinus bradycardia) is one of the major barriers for the effective treatment of hemodynamically unstable patients with heart failure and reduced cardiac output. We report a case of a man aged 58 years with an old broad anterior myocardial infarction and relative bradycardia (about 60 bpm) suffering from symptoms of congestive heart failure at rest in spite of optimal medical therapy, including the use of the inotropes. Transvenous atrial pacing during right heart catheterization indicated that an increase in h