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Association between heart rate variability indices and features of spontaneous ventricular tachyarrhythmias in mice
Authors:Mi He  Wei-Bo Zhao  My-Nhan Nguyen  Helen Kiriazis  Yong-Qin Li  Houyuan Hu  Xiao-Jun Du
Institution:1. Department of Cardiology, Southwest Hospital, Third Military Medical University (Army Medical University), Chongqing, China

School of Biomedical Engineering and Imaging Medicine, Third Military Medical University (Army Medical University), Chongqing, China;2. Department of Cardiology, Southwest Hospital, Third Military Medical University (Army Medical University), Chongqing, China;3. Experimental Cardiology Laboratory, Baker Heart and Diabetes Institute, Melbourne, Vic, Australia;4. School of Biomedical Engineering and Imaging Medicine, Third Military Medical University (Army Medical University), Chongqing, China

Abstract:Direct evidence is limited for the association between heart rate variability (HRV) indices and ventricular tachyarrhythmias (VTAs). While galectin-3 (Gal-3) is regarded as a causal factor for cardiac remodelling and a biomarker for arrhythmias, its regulation on VTAs and HVR is unknown. Using aged transgenic (TG) mice with cardiac overexpression of β2-adrenoceptors and spontaneous VTAs, we studied whether changes in HRV indices correlated with the severity of VTAs, and whether Gal-3 gene knockout (KO) in TG mice might limit VTA. Body-surface ECG was recorded (10-minute period) in 9- to 10-month-old mice of non-transgenic (nTG), TG and TG × Gal-3 knockout (TG/KO). Time-domain, frequency-domain and nonlinear-domain HRV indices were calculated using the R-R intervals extracted from ECG signals and compared with frequency of VTAs. TG and TG/KO mice developed frequent VTAs and showed significant changes in certain time-domain and nonlinear-domain HRV indices relative to nTG mice. The severity of VTAs in TG and TG/KO mice in combination, estimated by VTA counts and arrhythmia score, was significantly correlated with certain time-domain and nonlinear-domain HRV indices. In conclusion, significant changes in HRV indices were evident and correlated with the severity of spontaneous VTAs in TG mice. The frequency of VTA and HRV indices were largely comparable between TG and TG/KO mice. Deletion of Gal-3 in TG mice altered certain HRV indices implying influence by neuronally localized Gal-3 on autonomic nervous activity.
Keywords:cardiomyopathy  galectin-3  heart rate variability  transgenic mouse model  ventricular tachyarrhythmia
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