Multicenter automatic defibrillator implantation trial-cardiac resynchronization therapy (MADIT-CRT): design and...

Area of Science:

• Cardiology
• Electrophysiology
• Heart Failure Research

Background:

• Cardiomyopathy and left ventricular dysfunction increase mortality risk.
• Prolonged intraventricular conduction (QRS duration >or= 130 ms) is associated with poor outcomes.
• Cardiac Resynchronization Therapy with a defibrillator (CRT-D) is a potential intervention.

Purpose of the Study:

• To evaluate the efficacy of CRT-D in reducing mortality and heart failure (HF) events.
• To assess the impact of CRT-D in patients with ischemic and non-ischemic cardiomyopathy.
• To determine if CRT-D offers a 25% risk reduction in the target population.

Main Methods:

• The study is the Multicenter Automatic Defibrillator Trial with Cardiac Resynchronization Therapy (MADIT-CRT).
• Inclusion criteria: NYHA class I-II (ischemic) or NYHA class II (non-ischemic) cardiomyopathy, ejection fraction (EF) <= 0.30, and QRS duration >= 130 ms.
• The trial aims to compare outcomes between CRT-D recipients and a control group.

Main Results:

• This section is not yet available as the trial is planned.
• Anticipated outcome: a significant reduction in mortality and HF events.

Conclusions:

• The MADIT-CRT trial is expected to provide critical data on CRT-D effectiveness.
• Findings will inform clinical practice for managing heart failure in specific patient groups.
• The study will clarify the role of CRT-D in patients with reduced ejection fraction and conduction delays.