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Within-diver variability in venous gas emboli (VGE) following repeated dives. | LitMetric

Within-diver variability in venous gas emboli (VGE) following repeated dives.

Diving Hyperb Med

Navy Experimental Diving Unit, Panama City, Florida, USA.

Published: December 2023

AI Article Synopsis

  • Venous gas emboli (VGE) are often studied as indicators of decompression sickness (DCS) during dive research, but it's unclear how much VGE variability comes from differences between divers versus within the same diver over multiple dives.
  • A study analyzed post-dive VGE data from 834 dives, revealing that 67% of VGE variability occurs within individual divers and only 33% is due to differences between divers.
  • The findings indicate that personal variability in VGE levels suggests that VGE measurements are not reliable for assessing DCS risk in individual divers after repeated dives on the same profile.

Article Abstract

Introduction: Venous gas emboli (VGE) are widely used as a surrogate endpoint instead of decompression sickness (DCS) in studies of decompression procedures. Peak post-dive VGE grades vary widely following repeated identical dives but little is known about how much of the variability in VGE grades is proportioned between-diver and within-diver.

Methods: A retrospective analysis of 834 man-dives on six dive profiles with post-dive VGE measurements was conducted under controlled laboratory conditions. Among these data, 151 divers did repeated dives on the same profile on two to nine occasions separated by at least one week (total of 693 man-dives). Data were analysed for between- and within-diver variability in peak post-dive VGE grades using mixed-effect models with diver as the random variable and associated intraclass correlation coefficients.

Results: Most divers produced a wide range of VGE grades after repeated dives on the same profile. The intraclass correlation coefficient (repeatability) was 0.33 indicating that 33% of the variability in VGE grades is between-diver variability; correspondingly, 67% of variability in VGE grades is within-diver variability. DCS cases were associated with an individual diver's highest VGE grades and not with their lower VGE grades.

Conclusions: These data demonstrate large within-diver variability in VGE grades following repeated dives on the same dive profile and suggest there is substantial within-diver variability in susceptibility to DCS. Post-dive VGE grades are not useful for evaluating decompression practice for individual divers.

Download full-text PDF

Source
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC10944664PMC
http://dx.doi.org/10.28920/dhm53.4.333-339DOI Listing

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