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B fibers are the best predictors of cardiac activity during Vagus nerve stimulation

Jul 17, 2018

The traditional method of titrating stimulus intensity based on patient perception produces highly variable responses. This study explores using the vagal response to measure stimulation dose and predict physiological effect. Clinicians are investigating the use of VNS for heart failure management, and this work aims to correlate cardiac measures with vagal fiber activity.

By recording vagal activity during VNS in rats and using regression analysis, Kurt Y. Quing with his team found that cardiac activity across all animals was best correlated to the activation of a specific vagal fiber group. With conduction velocities ranging from 5 to 10 m/s, these fibers are classified as B fibers (using the Erlanger-Gasser system) and correspond to vagal parasympathetic efferents.

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FujiFilm VisualSonics Inc. is a manufacturer of real-time, in vivo, high-resolution micro-imaging systems designed specifically for preclinical research.

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