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Benefits of Cardiac Resynchronization Therapy in an Asynchronous Heart Failure Model Induced by Left Bundle Branch Ablation and Rapid Pacing
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Benefits of Cardiac Resynchronization Therapy in an Asynchronous Heart Failure Model Induced by Left Bundle Branch Ablation and Rapid Pacing

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Functional capacity and changes in the neurohormonal and cytokine status after long-term CRT in heart failure

M Seifert1, M Schlegl, W Hoersch

  • 1Heart Center Brandenburg in Bernau/Berlin-Department of Cardiology, Germany. m.seifert@immanuel.de <m.seifert@immanuel.de>

International Journal of Cardiology
|June 22, 2007
PubMed

Insights

Long-term cardiac resynchronization therapy (CRT) significantly improves heart failure patients' functional capacity and left ventricular ejection fraction (LVEF). CRT also reduces levels of brain natriuretic peptide (BNP) and norepinephrine (NE), key indicators of cardiac strain.

Area of Science:

  • Cardiology
  • Heart Failure Management
  • Biomarkers in Heart Failure

Background:

  • Congestive heart failure (CHF) is often associated with elevated neurohormonal and cytokine levels.
  • Assessing the impact of cardiac resynchronization therapy (CRT) on these biomarkers is crucial for understanding treatment efficacy.

Purpose of the Study:

  • To investigate the long-term effects of CRT on neurohormonal (BNP, NE) and cytokine levels in CHF patients.
  • To correlate these changes with improvements in functional capacity (peak VO2, VO2 AT) and left ventricular function (LVEF).

Main Methods:

  • A cohort of 22 CHF patients (LVEF ≤ 30%, NYHA II-IV, QRS ≥ 120 ms) from the PATH-CHF II study were analyzed.
  • Measurements of BNP, NE, TNF-α, TNF-α R1, and IL-6 were taken at baseline and 12-month follow-up.
  • Functional capacity (peak VO2, VO2 AT) and LVEF were assessed before and after CRT implantation with atrioventricular sequential left ventricular pacing.

Main Results:

  • CRT significantly improved peak VO2 (13±2.4 to 14.8±2.8 ml/kg/min) and VO2 AT (9±2 to 10.1±1.9 ml/kg/min).
  • Left ventricular ejection fraction (LVEF) showed a significant increase from 22.2±6.2% to 32±10.1%.
  • Significant reductions were observed in brain natriuretic peptide (BNP) (332.9±295.2 to 193.4±253 pg/ml) and norepinephrine (NE) (410.6±306.0 to 274.4±174.3 ng/l).

Conclusions:

  • Long-term cardiac resynchronization therapy (CRT) is effective in improving functional capacity and left ventricular function in CHF patients.
  • CRT is associated with a significant decrease in key neurohormonal markers, including BNP and NE.
  • These findings highlight CRT's beneficial impact on both clinical outcomes and underlying pathophysiology in heart failure.
Abstract

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