Key result
Ambulatory ECG monitoring links severe heart failure to markedly depressed heart rate variability and autonomic dysfunction.
Why the study?
Heart failure involves progressive autonomic and cardiorespiratory dysregulation that episodic clinical assessments incompletely capture, which continuous ambulatory ECG may help characterize.
Observational (n=15)
No
Long-duration ambulatory ECG in severe heart failure reveals significant inter-individual heterogeneity and within-subject temporal variability in heart rate and autonomic function, highlighting the limitations of single-parameter spot checks.
Exploratory ECG characterization of cardiorespiratory dynamics in severe HF; hypothesis-generating and requires prospective validation before any clinical adoption.
BACKGROUND: Heart failure is associated with progressive autonomic and cardiorespiratory dysregulation that is incompletely captured by episodic clinical assessment. Continuous ambulatory ECG offers a unique opportunity to describe longitudinal physiological dynamics, particularly in patients with advanced disease. AIM: The aim of this study is to provide a descriptive and exploratory physiological characterisation of cardiac and respiratory dynamics in patients with severe heart failure using long-duration ambulatory ECG recordings. METHODS: This retrospective secondary analysis used the publicly available Beth Israel Deaconess Medical Center (BIDMC) Congestive Heart Failure database, comprising approximately 20 hours of two-channel ambulatory ECG recordings from 15 patients with NYHA class III-IV heart failure. Automated ECG annotations were used to derive heart rate (HR), time- and frequency-domain heart rate variability (HRV), and ECG-derived respiration (EDR). Analyses focused on inter-individual variability and within-subject temporal patterns using descriptive statistics and longitudinal visualisation. RESULTS: Marked heterogeneity was observed across subjects in mean HR and HRV metrics, with generally depressed HRV consistent with advanced autonomic dysfunction. Longitudinal analyses revealed substantial within-subject variability and temporal trends in HR and EDR across recording periods, including systematic differences between early and late segments. HR and HRV showed partial dissociation across individuals, underscoring the limitations of single-parameter assessment. CONCLUSION: Long-duration ambulatory ECG enables rich descriptive characterisation of cardiac and respiratory physiology in severe heart failure. These findings are exploratory and hypothesis-generating, providing a physiological foundation for future studies that integrate clinical covariates, outcomes, and contemporary wearable technologies.
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Khan et al. (2026) conducted an observational in Severe heart failure (n=15). Long-duration ambulatory ECG monitoring was evaluated on Inter-individual variability and within-subject temporal dynamics of HR, HRV, and ECG-derived respiration. Long-duration ambulatory ECG monitoring in patients with severe heart failure revealed marked inter-individual heterogeneity and depressed heart rate variability consistent with autonomic dysfunction.
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