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Echocardiographic methods for selecting patients suitable for biventricular pacing therapy
Z I Whinnett1, J E R Davies, R E Lane
1International Centre for Circulatory Health, St Mary's Hospital and Imperial College, London, UK. zacharywhinnett@yahoo.com
Minerva Cardioangiologica
|July 9, 2005
Summary
Electrocardiogram (ECG) criteria for biventricular pacing are insufficient, as many patients do not respond. Echocardiography offers a more sensitive method for identifying mechanical dyssynchrony and selecting appropriate candidates for this therapy.
Area of Science:
- Cardiology
- Medical Imaging
- Biomedical Engineering
Background:
- Large outcome studies for biventricular pacing have historically relied on electrocardiogram (ECG) criteria, specifically prolonged QRS duration and left bundle branch block morphology.
- A significant proportion of patients (20-30%) receiving biventricular pacing based on ECG criteria do not exhibit a positive clinical response.
- This lack of response highlights the limitations of ECG in accurately identifying patients who would benefit from cardiac resynchronization therapy.
Purpose of the Study:
- To review promising echocardiographic techniques for detecting mechanical dyssynchrony.
- To compare the sensitivity and specificity of echocardiography against ECG criteria for patient selection.
- To provide clinical guidance on utilizing echocardiography for selecting patients eligible for biventricular pacing.
Main Methods:
- Review of existing literature on echocardiographic techniques for assessing mechanical dyssynchrony.
- Analysis of studies comparing echocardiographic methods with ECG criteria in patient selection for biventricular pacing.
- Evaluation of the diagnostic performance (sensitivity and specificity) of various echocardiographic modalities.
Main Results:
- Several echocardiographic techniques demonstrate higher sensitivity and specificity than ECG in identifying mechanical dyssynchrony.
- These advanced imaging modalities offer a more precise approach to patient selection for biventricular pacing.
- Echocardiography can identify patients likely to respond to biventricular pacing who might be missed by standard ECG criteria.
Conclusions:
- Echocardiography represents a superior tool for detecting mechanical dyssynchrony compared to traditional ECG criteria.
- Implementing echocardiographic assessment can improve patient selection for biventricular pacing, potentially increasing response rates.
- Clinical guidelines should incorporate echocardiographic evaluation to optimize outcomes in patients undergoing biventricular pacing.
