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Related Experiment Videos

Effect of multisite pacing on ventricular coordination.

C Varma1, P O'Callaghan, N G Mahon

  • 1Department of Cardiological Sciences, St George's Hospital Medical School, Cranmer Terrace, London SW17 0RE, UK. cvarma@sghms.ac.uk

Heart (British Cardiac Society)
|March 22, 2002
PubMed
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Right ventricular pacing improved coordination in heart failure patients with baseline incoordination. However, left ventricular or biventricular pacing may worsen coordination by causing asynchronous contractions.

Area of Science:

  • Cardiology
  • Cardiac Electrophysiology
  • Heart Failure Management

Background:

  • Left ventricular (LV) dysfunction and dyssynchrony are common in heart failure.
  • Multisite pacing strategies are explored to optimize cardiac function.

Purpose of the Study:

  • To evaluate the impact of different multisite pacing configurations on left ventricular function and coordination in patients with heart failure and left bundle branch block.

Main Methods:

  • Prospective observational study involving 18 heart failure patients.
  • Pacing at right ventricle (RV) apex, RV outflow tract, LV, and simultaneous biventricular sites.
  • Echocardiography and LV pressure measurements assessed LV function and cycle efficiency.

Main Results:

Related Experiment Videos

  • The optimal pacing site for improved cycle efficiency varied among patients.
  • Right ventricular pacing significantly improved cycle efficiency in patients with baseline incoordination.
  • Left ventricular or biventricular pacing induced asynchronous contractions in some patients, potentially worsening coordination.

Conclusions:

  • Pacing can enhance ventricular coordination in heart failure patients with baseline incoordination.
  • Careful selection of pacing sites is crucial, as some configurations may lead to asynchronous contractions.
  • Further research is needed to define the clinical implications of these findings.