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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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Patients with left bundle branch block pattern and high cardiac risk myocardial SPECT: does the current management

T J F Ten Cate1, J C Kelder, H W M Plokker

  • 1Department of Nuclear Medicine, St. Antonius Hospital, Nieuwegein, Koekoekslaan 1, 3435, CM, Nieuwegein, the Netherlands, timtencate@yahoo.com.

Netherlands Heart Journal : Monthly Journal of the Netherlands Society of Cardiology and the Netherlands Heart Foundation
|June 23, 2011
PubMed

Insights

Myocardial perfusion SPECT (MPS) effectively stratifies cardiovascular risk in patients with left bundle branch block or ventricular pacing. A low-risk MPS indicates watchful waiting, while high-risk MPS warrants further investigation and treatment.

Area of Science:

  • Cardiology
  • Nuclear Medicine
  • Diagnostic Imaging

Background:

  • Myocardial perfusion SPECT (MPS) is a key tool for cardiovascular risk stratification.
  • Its utility in patients with abnormal ventricular electrical activation, such as left bundle branch block (LBBB) or ventricular pacing, remains debated.
  • This review evaluates the prognostic value of MPS in these specific patient populations.

Purpose of the Study:

  • To assess the effectiveness of MPS in risk stratifying patients with intrinsic LBBB or LBBB secondary to right ventricular apical pacing.
  • To determine the prognostic implications of low-risk versus high-risk MPS findings in these cohorts.

Main Methods:

  • A comprehensive literature search of the MEDLINE database was conducted from January 1980 to September 2010.
  • Search terms included "prognosis" or "prognostic value" combined with "SPECT" and "LBBB" or "pacing" or "pacemakers."
  • Eleven studies were identified and reviewed, categorizing MPS results as low or high risk based on original definitions.

Main Results:

  • A low-risk MPS result was consistently associated with a low incidence of cardiac events.
  • High-risk MPS findings indicated a significantly elevated risk of cardiac events, with a 4.8-fold increased risk (95% CI [3.2 - 7.2], p < 0.0001).
  • These prognostic indicators remained largely unchanged over time, despite advancements in secondary prevention and patient care.

Conclusions:

  • Low-risk MPS results support a strategy of watchful waiting for patients with LBBB or ventricular pacing.
  • High-risk MPS necessitates further diagnostic evaluation and prompt therapeutic intervention.
  • The sustained high rates of cardiac death and myocardial infarction following high-risk MPS suggest current management strategies for these patients may be insufficient and require re-evaluation.
Abstract

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