[Cardiac resynchronization in narrow QRS and less affected exercise capacity].

Area of Science:

• Cardiology
• Medical Devices
• Heart Failure Management

Context:

• Atrio-biventricular pacemaker therapy, known as cardiac resynchronization therapy (CRT), is a standard treatment for advanced systolic heart failure (HF) with intraventricular conduction delay, particularly left bundle branch block.
• Current guidelines establish CRT for specific patient profiles characterized by severe symptoms and conduction abnormalities.

Purpose:

• To explore and summarize potential applications of biventricular pacing beyond the established indications for CRT.
• To review existing data on CRT efficacy in patients with symptomatic systolic HF but narrow QRS complexes.
• To examine CRT's role in patients with wide QRS complexes but minimal or no overt HF symptoms.

Summary:

• Cardiac resynchronization therapy (CRT) is a well-established treatment for systolic heart failure (HF) patients with conduction delays.
• This article investigates extending CRT to patients with symptomatic HF but narrow QRS, and those with wide QRS but less pronounced HF.
• Evidence suggests potential benefits of biventricular pacing in these expanded patient groups.

Impact:

• Broadens the understanding of biventricular pacing applications in heart failure management.
• Identifies patient subgroups who might benefit from CRT beyond current standard criteria.
• Highlights areas for future research in optimizing CRT utilization for diverse HF populations.