Research

Adrenal insufficiency in prolonged critical illness

Jenn-Yu Wu¹ , Szu-Chun Hsu² , Shih-Chi Ku¹ , Chao-Chi Ho^1,3 , Chong-Jen Yu¹ and Pan-Chyr Yang¹

¹Department of Internal Medicine, National Taiwan University Hospital, Chung-Shan South Road, Taipei, Taiwan 100, Republic of China

²Department of Laboratory Medicine, National Taiwan University Hospital, Chung-Shan South Road, Taipei, Taiwan 100, Republic of China

³Department of Emergency Medicine, National Taiwan University Hospital, Chung-Shan South Road, Taipei, Taiwan 100, Republic of China

author email corresponding author email

Critical Care 2008, 12:R65doi:10.1186/cc6895

Published:	8 May 2008

See related commentary by Bollaert, http://ccforum.com/content/12/4/163

Abstract

Introduction

Adrenal insufficiency is common in critically ill patients and affects their prognosis, but little is known about how adrenal function changes during prolonged critical illness. This study was conducted to investigate dynamic changes in cortisol levels in patients with critical illness who do not improve after treatment.

Methods

This observational cohort study was performed in the intensive care units of a university hospital. We studied acutely ill patients with initial cortisol level above 34 μg/dl, but who did not improve after treatment and in whom follow-up cortisol levels were determined during critical illness. All clinical information and outcomes were recorded.

Results

Fifty-seven patients were included. Ten patients had follow-up cortisol levels above 34 μg/dl, 32 patients had levels between 34 and 15 μg/dl, and 15 patients had levels under 15 μg/dl. Outcomes did not differ significantly among the three groups with different follow-up cortisol levels. In Cox regression analysis, those patients who survived to hospital discharge with second cortisol levels under 15 μg/dl had a longer hospital length of stay (odds ratio = 14.8, 95% confidence interval = 2.4 to 90.0; P = 0.004).

Conclusion

The majority of acutely ill patients who remained in a critical condition had decreased serum cortisol levels. Depressed cortisol levels at follow up may lead to worse clinical outcomes. We propose that repeated adrenal function testing be conducted in patients with prolonged critical illness.