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Cardiac resynchronization therapy (CRT), whether or not combined with an implantable cardioverter-defibrillator, is one of the most important innovations in the treatment of chronic heart failure (CHF). It is able to restore ventricular synchrony in patients with severe intraventricular conduction disturbances, particularly complete left bundle branch block or QRS interval >150 ms. These conduction disorders, found in a third of cases of severe CHF, lead to mechanical dyssynchrony and systolic dysfunction, and several large multicenter randomized trials have demonstrated that CRT improves functional class and quality of life and significantly reduces mortality and hospitalizations for CHF. This treatment modality is increasingly studied and used in clinical practice, with ever-growing numbers of

Pacing multi‐site para ressincronização cardíaca na fibrilhação auricular – uma janela com cenários diferentes