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Clinical Implications of Present Physiological Understanding of HRV Components

  • Published:
Cardiac Electrophysiology Review

Abstract

Time and frequency domain analysis of heart rate variability (HRV) is a non invasive techniquecapable of providing information on autonomic modulation of the sinus node and of stratifying risk aftermyocardial infarction and in heart failure. One of the basic assumptions used to explain the negative predictivevalue of reduced HRV was the concept that overall HRV was largely dependent on vagal mechanisms and that areduction in HRV could reflect an increased sympathetic and a reduced vagal modulation of sinus node; i.e.,an autonomic imbalance favouring cardiac electrical instability. This initial interpretation was challenged byseveral findings indicating a greater complexity of the relationship between neural input and sinus noderesponsiveness as well as the possible interference with non neural mechanisms.

Nevertheless, the prognostic value of time and geometric parameters of HRV has been consistently confirmed.More complex is the interpretation of spectral parameters particularly when they are computed on 24-hourrecordings. Under controlled conditions, instead, the computation of low and high frequency components and oftheir ratio seems to provide information on sympatho-vagal balance in normal subjects as well as in most patientswith preserved left ventricular function, thus providing an unique tool to investigate neural control mechanisms.More recently, analysis on nonlinear dynamics of HRV has been utilized to describe the fractal-likecharacteristics of the variability signal and has been shown to identify patients at risk for sudden cardiacdeath.

In conclusion, in spite of an incomplete understanding of the physiological significance of HRV parameters,this non invasive methodology is of substantial utility to evaluate autonomic control mechanisms and to identifypatients with an increased cardiac mortality.

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Authors and Affiliations

  1. Cardiologia, Dipartimento di Medicina Chirurgia e Odontoiatria, Osp. San Paolo, University of Milan, Milan, Italy

    Federico Lombardi

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  1. Federico Lombardi
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Lombardi, F. Clinical Implications of Present Physiological Understanding of HRV Components. Card Electrophysiol Rev 6, 245–249 (2002). https://doi.org/10.1023/A:1016329008921

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