Atrial fibrillation (AF) and heart failure (HF) are two common heart conditions that are encountered with an increase in death and suffering. When both these two conditions occur in a patient, the patient's prognosis is poor with a reduced quality of life. These patients are frequently admitted to the hospital and have increased risk of death. In these HF patients who are in AF all of the time, who would otherwise be a suitable candidate for an implantable defibrillator to prevent sudden cardiac death, whether adding pacing of both ventricles will reduce death and suffering. Other studies have shown that adding pacing to both ventricles is of benefit in HF patients with mild to moderate symptoms and have a regular heart rhythm. The Investigators now want to explore if this therapy will benefit those patients with a permanent irregular heart rhythm (AF). The Investigators will also be assessing the cost effectiveness of this treatment strategy and the life quality for these patients. This study may have a dramatic impact on the way the Investigators manage these patients with atrial fibrillation and heart failure and may improve the outlook and well being of these patients.
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