Heart rate variability as an indicator of left ventricular systolic dysfunction

Area of Science:

• Cardiology
• Vascular Medicine
• Biomedical Engineering

Background:

• Heart rate variability (HRV) is a non-invasive measure reflecting autonomic nervous system function.
• Vascular episodes like stroke and peripheral vascular disease (PVD) can be associated with cardiac dysfunction.
• Left ventricular systolic dysfunction (LVSD) is a critical indicator of cardiac health.

Purpose of the Study:

• To compare HRV measures in patients with non-cardiac vascular episodes versus age- and gender-matched controls.
• To investigate the association between HRV parameters and cardiac function, specifically LVSD.
• To determine if HRV can serve as a pre-screening tool for LVSD.

Main Methods:

• A cohort study involving 114 patients (100 cases, 14 controls) selected from 522 subjects.
• Patients presented with stroke, transient ischaemic attack (TIA), or peripheral vascular disease (PVD).
• Multiple regression analysis was employed to correlate HRV indices with heart rate and ejection fraction.

Main Results:

• No significant differences in HRV indices were found between non-cardiac vascular patients and controls.
• HRV did not predict LVSD in the studied cohort.
• Ischaemic heart disease (IHD) and cigarette smoking were independent predictors of reduced HRV (SDNN), alongside diabetes.

Conclusions:

• HRV indices do not differentiate non-cardiac vascular patients from controls.
• HRV is not diagnostically valuable as a pre-screening test for suspected LVSD.
• Further research is warranted to explore HRV as a potential marker for endothelial dysfunction.