Slowed atrial and atrioventricular conduction and depressed HRV in a murine model of hypertrophic cardiomyopathy

Wei-Wen Lim, Mathias Baumert, Melissa Neo, Pawel Kuklik, Anand N. Ganesan, Dennis H. Lau, Tatiana Tsoutsman, Christopher Semsarian, Prashanthan Sanders, David A. Saint*

*Corresponding author for this work

Research output: Contribution to journalArticleAcademicpeer-review

3 Citations (Web of Science)

Abstract

Hypertrophic cardiomyopathy (HCM) is a common heritable cardiac disorder with diverse clinical outcomes including sudden death, heart failure, and stroke. Depressed heart rate variability (HRV), a measure of cardiac autonomic regulation, has been shown to predict mortality in patients with cardiovascular disease. Cardiac autonomic remodelling in animal models of HCM are not well characterised. This study analysed Gly203-Ser cardiac troponin-I transgenic (TG) male mice previously demonstrated to develop hallmarks of HCM by age 21 weeks. 33 mice aged 30 and 50 weeks underwent continuous electrocardiogram (ECG) recording for 30 min under anaesthesia. TG mice demonstrated prolonged P-wave duration (P <0.001) and PR intervals (P <0.001) compared to controls. Additionally, TG mice demonstrated depressed standard deviation of RR intervals (SDRR; P <0.01), coefficient of variation of RR intervals (CVRR; P <0.001) and standard deviation of heart rate (SDHR; P <0.001) compared to controls. Additionally, total power was significantly reduced in TG mice (P <0.05). No significant age-related difference in either strain was observed in ECG or HRV parameters. Mice with HCM developed slowed atrial and atrioventricular conduction and depressed HRV. These changes were conserved with increasing age. This finding may be indicative of atrial and ventricular hypertrophy or dysfunction, and perhaps an indication of worse clinical outcome in heart failure progression in HCM patients.
Original languageEnglish
Pages (from-to)95-101
JournalClinical and Experimental Pharmacology and Physiology
Volume43
Issue number1
DOIs
Publication statusPublished - Jan 2016

Keywords

  • electrocardiography
  • heart rate variability
  • hypertrophic cardiomyopathy
  • mice

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