Elevated plasma free cortisol concentrations and ratios are associated with increased mortality even in the presence of statin therapy in patients with severe sepsis

Venkatesh, Balasubramanian, Imeson, Lee, Kruger, Peter, Cohen, Jeremy, Jones, Mark and Bellomo, Rinaldo (2014) Elevated plasma free cortisol concentrations and ratios are associated with increased mortality even in the presence of statin therapy in patients with severe sepsis. Critical Care Medicine, 43 3: 630-635. doi:10.1097/CCM.0000000000000750


Author Venkatesh, Balasubramanian
Imeson, Lee
Kruger, Peter
Cohen, Jeremy
Jones, Mark
Bellomo, Rinaldo
Title Elevated plasma free cortisol concentrations and ratios are associated with increased mortality even in the presence of statin therapy in patients with severe sepsis
Journal name Critical Care Medicine   Check publisher's open access policy
ISSN 1530-0293
0090-3493
Publication date 2014-12-15
Year available 2014
Sub-type Article (original research)
DOI 10.1097/CCM.0000000000000750
Open Access Status
Volume 43
Issue 3
Start page 630
End page 635
Total pages 6
Place of publication Baltimore MD, United States
Publisher Lippincott Williams & Wilkins
Collection year 2015
Language eng
Formatted abstract
Background: Dissociation between plasma free cortisol and total cortisol profiles exists in critical illness. Data on plasma free cortisol are based on either calculated values or immunoassay-based measurements. Both have significant limitations. Statins have been advocated as a therapy in sepsis. Whether they impact on plasma cortisol through inhibition of cholesterol synthesis is unclear.

Objectives: In patients enrolled into a randomized trial of statins in sepsis (n = 250), we examined the association of mass spectrometry measured plasma free cortisol, plasma free cortisol/plasma total cortisol ratios, and outcome and the impact of concomitant statin therapy on cortisol profiles in 80 steroid naive patients.

Patients: Two hundred twenty serial measurements of plasma free cortisol, plasma total cortisol, and interleukin-6 were collected from 80 patients (43 placebo and 37 statins). Data from 10 volunteers were used as controls.

Measurements and Main Results: Data are presented as median and interquartile range. Compared with controls, in severe sepsis, baseline plasma total cortisol was elevated two-fold (463 nmol/L [284-742 nmol/L] vs 245 nmol/L [200-299 nmol/L], p < 0.001), plasma free cortisol 20-fold (75 nmol/L [20-151 nmol/L] vs 5 nmol/L [5-7 nmol/L], p < 0.001), and plasma free cortisol/plasma total cortisol ratio six-fold (0.15 vs 0.02, p = 0.058). Baseline interleukin-6 was elevated at 121 pg/mL (65-611 pg/mL). In severe sepsis, there were no differences in plasma total cortisol (p = 0.66), plasma free cortisol (p = 0.77), and interleukin-6 (p = 0.29) between statins and placebo groups. Plasma free cortisol, plasma total cortisol, and plasma free cortisol/plasma total cortisol were positively correlated with interleukin-6 (p = 0.0001, p < 0.0004, and p < 0.001, respectively) and day 90 mortality (p = 0.03, p = 0.03, and p = 0.058, respectively). Elevated plasma free cortisol/plasma total cortisol ratios were associated with increased length of stay (p = 0.04). Baseline plasma free cortisol, plasma total cortisol, and plasma free cortisol/plasma total cortisol ratios were higher in nonsurvivors as compared with survivors (174 nmol/L [77-329 nmol/L] vs 57 nmol/L [17-122 nmol/L], p = 0.016; 890 nmol/L [333-1,430 nmol/L] vs 408 nmol/L [269-681 nmol/L], p = 0.035; and 0.19 [0.13-0.29] vs 0.14 [0.07-0.20]; p = 0.054, respectively).

Conclusions: In severe sepsis, plasma free cortisol increase is 10-fold greater than that of plasma total cortisol. Both are similarly associated with inflammatory response and mortality. Elevated plasma free cortisol/plasma total cortisol ratios were associated with increased length of stay. Statin therapy does not influence the plasma cortisol profiles in patients with severe sepsis.
Q-Index Code C1
Q-Index Status Confirmed Code
Institutional Status UQ
Additional Notes Published online ahead of print 15 Dec 2014

Document type: Journal Article
Sub-type: Article (original research)
Collections: Official 2015 Collection
School of Public Health Publications
School of Medicine Publications
 
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