Heart rate variability

Revision as of 22:01, 29 October 2019 by CMichaelGibson (talk | contribs)
(diff) ← Older revision | Latest revision (diff) | Newer revision → (diff)
Jump to navigation Jump to search

WikiDoc Resources for Heart rate variability

Articles

Most recent articles on Heart rate variability

Most cited articles on Heart rate variability

Review articles on Heart rate variability

Articles on Heart rate variability in N Eng J Med, Lancet, BMJ

Media

Powerpoint slides on Heart rate variability

Images of Heart rate variability

Photos of Heart rate variability

Podcasts & MP3s on Heart rate variability

Videos on Heart rate variability

Evidence Based Medicine

Cochrane Collaboration on Heart rate variability

Bandolier on Heart rate variability

TRIP on Heart rate variability

Clinical Trials

Ongoing Trials on Heart rate variability at Clinical Trials.gov

Trial results on Heart rate variability

Clinical Trials on Heart rate variability at Google

Guidelines / Policies / Govt

US National Guidelines Clearinghouse on Heart rate variability

NICE Guidance on Heart rate variability

NHS PRODIGY Guidance

FDA on Heart rate variability

CDC on Heart rate variability

Books

Books on Heart rate variability

News

Heart rate variability in the news

Be alerted to news on Heart rate variability

News trends on Heart rate variability

Commentary

Blogs on Heart rate variability

Definitions

Definitions of Heart rate variability

Patient Resources / Community

Patient resources on Heart rate variability

Discussion groups on Heart rate variability

Patient Handouts on Heart rate variability

Directions to Hospitals Treating Heart rate variability

Risk calculators and risk factors for Heart rate variability

Healthcare Provider Resources

Symptoms of Heart rate variability

Causes & Risk Factors for Heart rate variability

Diagnostic studies for Heart rate variability

Treatment of Heart rate variability

Continuing Medical Education (CME)

CME Programs on Heart rate variability

International

Heart rate variability en Espanol

Heart rate variability en Francais

Business

Heart rate variability in the Marketplace

Patents on Heart rate variability

Experimental / Informatics

List of terms related to Heart rate variability

Editor-In-Chief: C. Michael Gibson, M.S., M.D. [1]


Overview

Heart rate variability (HRV) is a measure of variations in the heart rate. It is usually calculated by analysing the time series of beat-to-beat intervals from ECG or arterial pressure tracings.

Various measures of heart rate variability have been proposed, which can roughly be subdivided into time domain, frequency domain and phase domain measures. HRV is regarded by some as an indicator of the activity of autonomic regulation of circulatory function, although this is an area of some controversy. Alteration (mostly reduction) of HRV has been reported to be associated with various pathologic conditions like hypertension, hemorrhagic shock, and septic shock. It has found its role as a predictor of mortality after an acute myocardial infarction.

Supplementing with fish oil may increase heart rate variability.[1]

Time domain

A simple example of a time domain measure is the calculation of the standard deviation of beat-to-beat intervals.

Frequency domain

A common frequency domain method is the application of the discrete Fourier transform to the beat-to-beat interval time series. That expresses the amount of variation for different frequencies. Several frequency bands of interest have been defined in humans.

  • High Frequency band (HF) between 0.15 and 0.4 Hz. HF is driven by respiration and appears to derive mainly from vagal activity.
  • Low Frequency band (LF) between 0.04 and 0.15 Hz. LF derives from both vagal and sympathetic activity and has been hypothesized to reflect the delay in the baroreceptor loop.
  • Very Low Frequency band (VLF) band between 0.0033 and 0.04 Hz. The origin of VLF is unknown, but it had been attributed to physical activity.
  • Ultra Low Frequency (ULF) band between 0 and 0.0033 Hz. The major background of ULF is day/night variation.

Phase domain

Various methods from the theory of dynamical systems have also been applied in the context of HRV analysis.

References

  1. "Fish Oil Supplements May Increase Heart Rate Variability"..

External links

Template:WikiDoc Sources