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Published in: Clinical Autonomic Research 2/2024

06-05-2024 | Chronic Heart Failure | Review Article

The effect of hyperoxia on muscle sympathetic nerve activity: a systematic review and meta-analysis

Authors: Desmond A. Young, Paris A. T. Jones, Brittany A. Matenchuk, Allison Sivak, Margie H. Davenport, Craig D. Steinback

Published in: Clinical Autonomic Research | Issue 2/2024

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Abstract

Purpose

We conducted a meta-analysis to determine the effect of hyperoxia on muscle sympathetic nerve activity in healthy individuals and those with cardio-metabolic diseases.

Methods

A comprehensive search of electronic databases was performed until August 2022. All study designs (except reviews) were included: population (humans; apparently healthy or with at least one chronic disease); exposures (muscle sympathetic nerve activity during hyperoxia or hyperbaria); comparators (hyperoxia or hyperbaria vs. normoxia); and outcomes (muscle sympathetic nerve activity, heart rate, blood pressure, minute ventilation). Forty-nine studies were ultimately included in the meta-analysis.

Results

In healthy individuals, hyperoxia had no effect on sympathetic burst frequency (mean difference [MD] − 1.07 bursts/min; 95% confidence interval [CI] − 2.17, 0.04bursts/min; P = 0.06), burst incidence (MD 0.27 bursts/100 heartbeats [hb]; 95% CI − 2.10, 2.64 bursts/100 hb; P = 0.82), burst amplitude (P = 0.85), or total activity (P = 0.31). In those with chronic diseases, hyperoxia decreased burst frequency (MD − 5.57 bursts/min; 95% CI − 7.48, − 3.67 bursts/min; P < 0.001) and burst incidence (MD − 4.44 bursts/100 hb; 95% CI − 7.94, − 0.94 bursts/100 hb; P = 0.01), but had no effect on burst amplitude (P = 0.36) or total activity (P = 0.90). Our meta-regression analyses identified an inverse relationship between normoxic burst frequency and change in burst frequency with hyperoxia. In both groups, hyperoxia decreased heart rate but had no effect on any measure of blood pressure.

Conclusion

Hyperoxia does not change sympathetic activity in healthy humans. Conversely, in those with chronic diseases, hyperoxia decreases sympathetic activity. Regardless of disease status, resting sympathetic burst frequency predicts the degree of change in burst frequency, with larger decreases for those with higher resting activity.
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Metadata
Title
The effect of hyperoxia on muscle sympathetic nerve activity: a systematic review and meta-analysis
Authors
Desmond A. Young
Paris A. T. Jones
Brittany A. Matenchuk
Allison Sivak
Margie H. Davenport
Craig D. Steinback
Publication date
06-05-2024
Publisher
Springer Berlin Heidelberg
Published in
Clinical Autonomic Research / Issue 2/2024
Print ISSN: 0959-9851
Electronic ISSN: 1619-1560
DOI
https://doi.org/10.1007/s10286-024-01033-4

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