Key result
Surface measurements using 1 mm electrode spacing accurately estimate true tissue conduction velocity near pacing sites.
Why the study?
Ignoring three-dimensional tissue aspects introduces error into intracardiac conduction velocity measurements, motivating this study to determine if a specific region allows accurate measurement.
Can surface conduction velocity measurements accurately estimate true tissue conduction velocity in a 3D ventricular model?
Can surface conduction velocity measurements accurately estimate true tissue conduction velocity in a 3D ventricular model?
Computer simulations suggest that surface conduction velocity measurements are only accurate when taken within 2 cm of the pacing site using an electrode spacing of 1 mm or less.
Answers are grounded in this paper and cite their sources.
Accurate surface CV requires pacing-site proximity and ≤1 mm spacing; leaves open translation to clinical ventricular mapping.
Background: Conduction velocity (CV) is a measure of the health of myocardial tissue. It can be measured by taking differences in activation times from intracardiac electrodes. Several factors introduce error into the measurement, amongst which, ignoring the three dimensional aspect is a major detriment. The purpose of this paper was to determine if, nonetheless, there was a specific region where CV could be accurately measured. Methods: Computer simulations of three dimensional ventricles with a realistic His-Purkinje system were performed. Ventricles also included a dense scar or diffuse fibrosis. Results: A finer spatial sampling produced better agreement with true CV. Using a error limit of 10 cm/s as a threshold, measurements taken within a region less than 2 cm from the pacing site proved to be accurate. Error increased abruptly beyond this distance. The Purkinje system and tissue fibre orientation played equally major roles in leading to a surface CV which was not reflective of the CV propagation through the tissue. Conclusions: Surface CV measurements close to the pacing site taken with an electrode spacing of at most 1 mm, give reasonable estimates of tissue CV.
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Vigmond et al. (2024) studied Cardiac surface conduction velocity measurement accuracy. Surface conduction velocity measurement vs. True 3D conduction velocity was evaluated on Conduction velocity error. Surface conduction velocity measurements taken within 2 cm of the pacing site with an electrode spacing of at most 1 mm provide accurate estimates of true tissue conduction velocity.
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