Abstract
This study investigated whether vagal nerve stimulation (VNS) leads to improvements in ischemic heart failure via heart rate modulation. At 7 ± 1 days post left anterior descending artery (LAD) ligation, 63 rats with myocardial infarctions (MI) were implanted with ECG transmitters and VNS devices (MI + VNS, N = 44) or just ECG transmitters (MI, N = 17). VNS stimulation was active from 14 ± 1 days to 8 ± 1 weeks post MI. The average left ventricular (LV) end diastolic volumes at 8 ± 1 weeks were MI = 672.40 μl and MI + VNS = 519.35 μl, p = 0.03. The average heart weights, normalized to body weight (±std) at 14 ± 1 weeks were MI = 3.2 ± 0.6 g*kg−1 and MI + VNS = 2.9 ± 0.3 g*kg−1, p = 0.03. The degree of cardiac remodeling was correlated with the magnitude of acute VNS-evoked heart rate (HR) changes. Further research is required to determine if the acute heart rate response to VNS activation is useful as a heart failure biomarker or as a tool for VNS therapy characterization.
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Acknowledgments
We would like to recognize the staff of the Boston Scientific Research and Technology Center and in particular Jason Kilvington, Dennis Werner, Vijay Koya, Amy Townsend, and Holly Coleman for performing the surgeries and echocardiography procedures. We would like to acknowledge Dean Anderlie, Joshua Haarer, Dave Olson, Pete Kelley, and Jason Hamann for designing and manufacturing rodent VNS device. Finally, we would like to recognize Nicholas Wold, Jason Hamann, Stephen Hahn, Scott Meyer, and Juan Hincapie for their critical review of the study protocol and manuscript draft.
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All animal experiments were performed in accordance to the National Research Council Guide for the Care and Use of Laboratory Animals and approved by the Boston Scientific Institutional Animal Care and Use Committee.
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This study was funded by Boston Scientific.
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Drs. Stolen and Ruble are employees of Boston Scientific, and Drs. Agarwal and Mokelke are former employees of Boston Scientific.
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No human studies were carried out by the authors for this article.
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Editor-in-Chief Jennifer L. Hall oversaw the review of this article
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Agarwal, R., Mokelke, E., Ruble, S.B. et al. Vagal Nerve Stimulation Evoked Heart Rate Changes and Protection from Cardiac Remodeling. J. of Cardiovasc. Trans. Res. 9, 67–76 (2016). https://doi.org/10.1007/s12265-015-9668-7
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DOI: https://doi.org/10.1007/s12265-015-9668-7