Relationship between New York Heart Association class change and ventricular tachyarrhythmia occurrence in patients...

Area of Science:

• Cardiology
• Electrophysiology
• Heart Failure Management

Background:

• Cardiac resynchronization therapy (CRT) improves outcomes in advanced heart failure (HF) with prolonged QRS duration.
• The added benefit of an implantable cardioverter defibrillator (ICD) in conjunction with CRT (CRT-D) is not fully established for all patients.

Purpose of the Study:

• To evaluate the relationship between functional status improvement after CRT-D therapy.
• To assess the occurrence of ventricular tachyarrhythmia/ventricular fibrillation (VT/VF) and death at 6-month follow-up.
• To identify predictors of CRT response and adverse events.

Main Methods:

• A cohort of 332 heart failure patients treated with CRT-D was analyzed.
• Baseline characteristics, New York Heart Association (NYHA) class, and ICD therapy for VT/VF were recorded.
• Outcomes including VT/VF episodes and death were assessed at 6-month follow-up.

Main Results:

• 20.5% of patients experienced VT/VF episodes, and 16 patients died within 6 months.
• Improvement in NYHA class was significantly associated with a decreased occurrence of VT/VF (P = 0.004).
• Patients who died had a significantly higher incidence of VT/VF compared to survivors (50% vs. 19%, P = 0.007).

Conclusions:

• Approximately 20% of patients received appropriate ICD therapy within 6 months post-CRT.
• Patients who responded to CRT, indicated by NYHA class improvement, experienced fewer VT/VF episodes.
• Further research is needed to establish criteria for optimizing device selection (CRT alone, ICD alone, or CRT-D).