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Heart Failure: Targeting the right patients for CRT-D
Date:5/22/2011

Patients with dyssynchronous yet viable ventricles are most likely to benefit from cardiac resynchronization therapy combined with defibrillation, concludes the latest analysis of the MADIT CRT trial. The CRT-MADIT-CRT trial - presented at the Heart Failure Congress 2011, organized by the Heart Failure Association of the European Society of Cardiology (ESC) in Late Breaking Session 1 - showed that CRT produced improvements in both synchrony and contractile function, and that the extent of this benefit relates to subsequent outcomes.

The Multicentre Automatic Defibrillator Implantation Trial-CRT (MADIT-CRT) set out to determine whether patients with mild heart failure (NYHA class I or II) would do better if they got implanted with a CRT-D device (which combines cardiac resynchronization therapy with defibrillation), than if they only received the traditional ICD defibrillation. In earlier studies CRT-D devices had been approved for use in patients with severe heart failure (NYHA class III/IV).

In the MADIT-CRT study, funded by Boston Scientific, 1820 patients with Class I and II heart failure, wide QRS and left ventricular dysfunction were randomized 3:2 to receive CRT-D (n=1089) or ICD alone (n=731). Results, presented at the 2009 ESC Annual Conference in Barcelona after a follow period averaging 2.4 years, demonstrated a greater than 40% reduction in the primary endpoint of death or heart failure in patients receiving CRT-D. However, in virtually all studies of CRT-D approximately 30% of patients do not respond to therapy.

In the current study, Dr Scott D Solomon (Brigham and Women's Hospital, Boston, MA) and colleagues set out to investigate whether the degree of synchrony the extent to which the walls of the left ventricle contract in unison might influence the likelihood of patients responding to CRT-D. "It's important to target patients in whom CRT-D works well because the technology is quite expensive," explained Solomon
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Contact: Jacqueline Partarrieu
press@escardio.org
33-492-947-756
European Society of Cardiology
Source:Eurekalert

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