An impact of relative adrenal insufficiency on short-term outcomes in non-critically ill cirrhotic patients: A prospective cohort study

Adrenal insufficiency in liver diseases - pathophysiology and underlying mechanisms

Relative adrenal insufficiency (RAI) is common in critically ill patients with cirrhosis, but it has been also documented in non-critically ill patients. Its pathophysiology is complex and not well understood yet. In this review, we aimed to present potential mechanisms and causal pathways implicated in the pathogenesis of RAI in cirrhosis. There is accumulating evidence supporting a suboptimal baseline adrenal function in cirrhosis mainly due to decreased cortisol synthesis and metabolism rates from the adrenal gland. Apart from this peripheral impairment, more recent studies suggest that there is a greater defect in the central stimulation of the hypothalamic-pituitary-adrenal (HPA) axis (hypothalamus/pituitary gland). Pro-inflammatory mediators, which are elevated in cirrhosis, have been also implicated through suppression of the HPA axis, decrease in cortisol synthesis and tissue glucocorticoid resistance. All abovementioned support the hepatoadrenal syndrome hypothesis that during episodes of acute decompensation there is suboptimal adrenocortical response that leads to worse outcomes. In conclusion, the complex pathophysiology of adrenal dysfunction in cirrhosis has not been fully elucidated yet and further research is needed in order to better understand this rather common entity in cirrhosis.

Relative adrenal insufficiency in the non-critically ill patient with cirrhosis: A systematic review and meta-analysis

BACKGROUND & AIMS

Characterization of relative adrenal insufficiency (RAI) in cirrhosis is heterogeneous with regard to studied patient populations and diagnostic methodology. We aimed to describe the prevalence and prognostic importance of RAI in non-critically ill patients with cirrhosis.

METHODS

A systematic review and meta-analysis was performed using MeSH terms and Boolean operators to search five large databases (Ovid-MEDLINE, ScienceDirect, Web of Science, Cochrane Library and ClinicalTrials.gov). The population of interest was patients with cirrhosis and without critical illness. The primary outcome was the pooled prevalence of RAI as defined by a peak total cortisol level <18 μg/dl, delta total cortisol <9 μg/dl or composite of the two thresholds in response either a standard-dose or low-dose short synacthen test. Odds ratios and standardized mean differences from random-effects models estimated important clinical outcomes and patient characteristics by adrenal functional status.

RESULTS

Twenty-two studies were included in final analysis, comprising 1991 patients with cirrhosis. The pooled prevalence of RAI was 37% (95% CI 33-42%). The prevalence of RAI varied by Child-Pugh classification, type of stimulation test used, specific diagnostic threshold and by severity of illness. Ninety-day mortality was significantly higher in patients with RAI (OR 2.88, 95% CI 1.69-4.92, I2 = 15%, p < 0.001).

CONCLUSIONS

Relative adrenal insufficiency is highly prevalent in non-critically ill patients with cirrhosis and associated with increased mortality. Despite the proposed multifactorial pathogenesis, no studies to date have investigated therapeutic interventions in this specific population.