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Related Experiment Video

Updated: May 25, 2026

Data Acquisition and Analysis In Brainstem Evoked Response Audiometry In Mice

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Published on: May 10, 2019

HRV analysis in local anesthesia using Continuous Wavelet Transform (CWT).

K Shafqat¹, S K Pal, S Kumari

¹School of Engineering and Mathematical Sciences, City University, London, UK. k.shafqat@city.ac.uk

Annual International Conference of the IEEE Engineering in Medicine and Biology Society. IEEE Engineering in Medicine and Biology Society. Annual International Conference

|January 19, 2012

Summary

Local anesthesia via brachial plexus block impacts cardiovascular autonomic control. Spectral analysis of Heart Rate Variability (HRV) showed a decreased LF/HF ratio, indicating reduced sympathetic activity post-block.

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Automated Analysis of Dynamic Ca2+ Signals in Image Sequences

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Published on: June 16, 2014

Area of Science:

Cardiology
Autonomic Nervous System Research
Anesthesiology

Background:

Heart Rate Variability (HRV) spectral analysis is crucial for assessing cardiovascular autonomic control.
Local anesthesia effects on autonomic function are not fully understood.
Brachial plexus blocks are common procedures requiring evaluation of their systemic impact.

Purpose of the Study:

To evaluate the impact of axillary brachial plexus block on HRV parameters.
To introduce a novel method for estimating HRV frequency band boundaries.
To assess changes in cardiovascular autonomic control following local anesthesia.

Main Methods:

Continuous Wavelet Transform (CWT) applied for HRV analysis.
Development and application of a new variable boundary method for frequency band estimation.
Non-parametric Wilcoxon signed rank test for statistical analysis.
HRV data collected pre- and post-brachial plexus block.

Main Results:

A novel method for estimating HRV frequency band boundaries was presented.
The LF/HF ratio significantly decreased within one hour post-block in 13/14 patients.
This suggests a reduction in sympathetic nervous system activity after brachial plexus block.

Conclusions:

Axillary brachial plexus block influences cardiovascular autonomic control.
The presented variable boundary method offers improved HRV analysis, especially for non-standard frequency ranges.
Findings indicate a shift towards parasympathetic dominance or reduced sympathetic tone post-block.