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Measurement of tissue cortisol levels in patients with severe burns: a preliminary investigation

INTRODUCTION: The assessment of adrenal function in critically ill patients is problematic, and there is evidence to suggest that measurement of tissue glucocorticoid activity may be more useful than estimation of plasma cortisol concentrations. Interstitial cortisol concentrations of cortisol repre...

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Autores principales: Cohen, Jeremy, Deans, Renae, Dalley, Andrew, Lipman, Jeff, Roberts, Michael S, Venkatesh, Bala
Formato: Texto
Lenguaje:English
Publicado: BioMed Central 2009
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC2811946/
https://www.ncbi.nlm.nih.gov/pubmed/19943926
http://dx.doi.org/10.1186/cc8184
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author Cohen, Jeremy
Deans, Renae
Dalley, Andrew
Lipman, Jeff
Roberts, Michael S
Venkatesh, Bala
author_facet Cohen, Jeremy
Deans, Renae
Dalley, Andrew
Lipman, Jeff
Roberts, Michael S
Venkatesh, Bala
author_sort Cohen, Jeremy
collection PubMed
description INTRODUCTION: The assessment of adrenal function in critically ill patients is problematic, and there is evidence to suggest that measurement of tissue glucocorticoid activity may be more useful than estimation of plasma cortisol concentrations. Interstitial cortisol concentrations of cortisol represent the available pool of glucocorticoids able to enter the cell and bind to the glucocorticoid receptor. However the concentrations of plasma cortisol may not accurately reflect interstitial concentrations. We elected to perform a preliminary study into the feasibility of measuring interstitial cortisol by microdialysis, and to investigate the relationship between total plasma cortisol, free plasma cortisol and interstitial cortisol in patients with severe burns. METHODS: A prospective observational study carried out in a tertiary intensive care unit. Ten adult patients with a mean total burn surface area of 48% were studied. Interstitial cortisol was measured by microdialysis from patient-matched burnt and non-burnt tissue and compared with that of 3 healthy volunteers. Plasma sampling for estimations of total and free cortisol concentrations was performed concurrently. RESULTS: In the burn patients, mean total plasma and free plasma cortisol concentrations were 8.8 +/- 3.9, and 1.7 +/- 1.1 mcg/dL, (p < 0.001), respectively. Mean subcutaneous microdialysis cortisol concentrations in the burn and non-burn tissue were 0.80 +/- 0.31 vs 0.74 +/- 0.41 mcg/dL (p = 0.8), respectively, and were significantly elevated over the mean subcutaneous microdialysis cortisol concentrations in the healthy volunteers. There was no significant correlation between total plasma or free plasma and microdialysis cortisol concentrations. Plasma free cortisol was better correlated with total burn surface area than total cortisol. CONCLUSIONS: In this preliminary study, interstitial cortisol concentrations measured by microdialysis in burnt and non-burnt skin from patients with severe thermal injury are significantly elevated over those from healthy volunteers. Plasma estimations of cortisol do not correlate with the microdialysis levels, raising the possibility that plasma cortisol may be an unreliable guide to tissue cortisol activity.
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spelling pubmed-28119462010-01-28 Measurement of tissue cortisol levels in patients with severe burns: a preliminary investigation Cohen, Jeremy Deans, Renae Dalley, Andrew Lipman, Jeff Roberts, Michael S Venkatesh, Bala Crit Care Research INTRODUCTION: The assessment of adrenal function in critically ill patients is problematic, and there is evidence to suggest that measurement of tissue glucocorticoid activity may be more useful than estimation of plasma cortisol concentrations. Interstitial cortisol concentrations of cortisol represent the available pool of glucocorticoids able to enter the cell and bind to the glucocorticoid receptor. However the concentrations of plasma cortisol may not accurately reflect interstitial concentrations. We elected to perform a preliminary study into the feasibility of measuring interstitial cortisol by microdialysis, and to investigate the relationship between total plasma cortisol, free plasma cortisol and interstitial cortisol in patients with severe burns. METHODS: A prospective observational study carried out in a tertiary intensive care unit. Ten adult patients with a mean total burn surface area of 48% were studied. Interstitial cortisol was measured by microdialysis from patient-matched burnt and non-burnt tissue and compared with that of 3 healthy volunteers. Plasma sampling for estimations of total and free cortisol concentrations was performed concurrently. RESULTS: In the burn patients, mean total plasma and free plasma cortisol concentrations were 8.8 +/- 3.9, and 1.7 +/- 1.1 mcg/dL, (p < 0.001), respectively. Mean subcutaneous microdialysis cortisol concentrations in the burn and non-burn tissue were 0.80 +/- 0.31 vs 0.74 +/- 0.41 mcg/dL (p = 0.8), respectively, and were significantly elevated over the mean subcutaneous microdialysis cortisol concentrations in the healthy volunteers. There was no significant correlation between total plasma or free plasma and microdialysis cortisol concentrations. Plasma free cortisol was better correlated with total burn surface area than total cortisol. CONCLUSIONS: In this preliminary study, interstitial cortisol concentrations measured by microdialysis in burnt and non-burnt skin from patients with severe thermal injury are significantly elevated over those from healthy volunteers. Plasma estimations of cortisol do not correlate with the microdialysis levels, raising the possibility that plasma cortisol may be an unreliable guide to tissue cortisol activity. BioMed Central 2009 2009-11-27 /pmc/articles/PMC2811946/ /pubmed/19943926 http://dx.doi.org/10.1186/cc8184 Text en Copyright ©2009 Cohen et al.; licensee BioMed Central Ltd. http://creativecommons.org/licenses/by/2.0 This is an open access article distributed under the terms of the Creative Commons Attribution License (http://creativecommons.org/licenses/by/2.0), which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.
spellingShingle Research
Cohen, Jeremy
Deans, Renae
Dalley, Andrew
Lipman, Jeff
Roberts, Michael S
Venkatesh, Bala
Measurement of tissue cortisol levels in patients with severe burns: a preliminary investigation
title Measurement of tissue cortisol levels in patients with severe burns: a preliminary investigation
title_full Measurement of tissue cortisol levels in patients with severe burns: a preliminary investigation
title_fullStr Measurement of tissue cortisol levels in patients with severe burns: a preliminary investigation
title_full_unstemmed Measurement of tissue cortisol levels in patients with severe burns: a preliminary investigation
title_short Measurement of tissue cortisol levels in patients with severe burns: a preliminary investigation
title_sort measurement of tissue cortisol levels in patients with severe burns: a preliminary investigation
topic Research
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC2811946/
https://www.ncbi.nlm.nih.gov/pubmed/19943926
http://dx.doi.org/10.1186/cc8184
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