Heart rate variability and haemodynamic function in individuals with hypertrophic cardiomyopathy

A I Alyahya, S J Charman, N C Okwose, A S Fuller, C Eggett, P Luke, K Bailey, G A MacGowan, D G Jakovljevic

Research output: Contribution to journalArticlepeer-review

Abstract

Objectives: Heart rate variability (HRV) is a measure of cardiac autonomic function. This study: (1) evaluated the differences in HRV and haemodynamic function between individuals with hypertrophic cardiomyopathy (HCM) and healthy controls, and (2) determined the relationship between HRV and haemodynamic variables in individuals with HCM. Methods: Twenty-eight individuals with HCM (n = 7, females; age 54 ± 15 years; body mass index: 29 ± 5 kg/m 2) and 28 matched healthy individuals (n = 7 females; age 54 ± 16 years; body mass index: 29 ± 5 kg/m 2) completed 5-min HRV and haemodynamic measurements under resting (supine) conditions using bioimpedance technology. Frequency domain HRV measures (absolute and normalized low-frequency power (LF), high-frequency power (HF) and LF/HF ratio) and RR interval were recorded. Results: Individuals with HCM demonstrated higher vagal activity (i.e., absolute unit of HF power (7.40 ± 2.50 vs. 6.03 ± 1.35 ms 2, p = 0.01) but lower RR interval (914 ± 178 vs. 1014 ± 168 ms, p = 0.03) compared to controls. Stroke volume (SV) index and cardiac index were lower in HCM compared with healthy individuals (SV, 33 ± 9 vs. 43 ± 7 ml‎/beat‎/m², p < 0.01; cardiac index,2.33 ± 0.42 vs. 3.57 ± 0.82 L/min/m 2, p < 0.01), but total peripheral resistance (TPR) was higher in HCM (3468 ± 1027 vs. 2953 ± 1050 dyn·s·m 2cm −5, p = 0.03). HF power was significantly related to SV (r = −0.46, p < 0.01) and TPR (r = 0.28, p < 0.05) in HCM. Conclusions: Short-term frequency domain indices of HRV provide a feasible approach to assess autonomic function in individuals with HCM. Vagal activity, represented by HF power, is increased, and associated with peripheral resistance in individuals with HCM.

Original languageEnglish
Pages (from-to)421-430
Number of pages10
JournalClinical Physiology and Functional Imaging
Volume43
Issue number6
Early online date9 Jun 2023
DOIs
Publication statusPublished - Nov 2023

Funder

European Union's Horizon 2020 Research and Innovation Programme. Grant Number: 777204

Keywords

  • Hypertrophic cardiomyopathy
  • Heart rate variability
  • Frequency domain
  • Haemodynamic function
  • Autonomic function

Fingerprint

Dive into the research topics of 'Heart rate variability and haemodynamic function in individuals with hypertrophic cardiomyopathy'. Together they form a unique fingerprint.

Cite this