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J Clin Endocrinol Metab. 2005 Jun;90(6):3202-8. Epub 2005 Mar 15.

Effects of short-term glucocorticoids on cardiovascular biomarkers.

Author information

1
Department of General Internal Medicine, Cleveland Clinic Foundation, Cleveland, Ohio 44195, USA. dbrotma1@jhmi.edu

Abstract

CONTEXT:

Glucocorticoids are known to acutely increase blood pressure, suppress inflammation, and precipitate insulin resistance. However, the short-term effects of glucocorticoids on other cardiovascular risk factors remain incompletely characterized.

OBJECTIVE:

Our objective was to determine the effects of a short course of dexamethasone on multiple cardiovascular biomarkers and to determine whether suppression of morning cortisol in response to low-dose dexamethasone is correlated with cardiovascular risk markers in healthy volunteers.

DESIGN:

We conducted a randomized, double-blind, placebo-controlled study.

SETTING:

The study took place in a tertiary care hospital.

STUDY SUBJECTS:

Twenty-five healthy male volunteers, ages 19-39 yr, participated in the study.

INTERVENTION:

Subjects received either 3 mg dexamethasone twice daily or placebo for 5 d. Subjects also underwent a low-dose (0.5 mg) overnight dexamethasone suppression test.

MEASURES:

Parameters examined before and after the 5-d intervention included heart rate, blood pressure, weight, fasting lipid variables, homocysteine, renin, aldosterone, insulin resistance (homeostasis model assessment), high-sensitivity C-reactive protein, B-type natriuretic peptide, flow-mediated and nitroglycerin-mediated brachial artery dilatation, and heart rate recovery after exercise. All measurements were done in the morning hours in the fasting state.

RESULTS:

Dexamethasone increased systolic blood pressure, weight, B-type natriuretic peptide, and high-density-lipoprotein-cholesterol. Dexamethasone decreased resting heart rate, high-sensitivity C-reactive protein, and aldosterone and tended to attenuate nitroglycerin-mediated vasodilatation. There was no effect on flow-mediated vasodilatation, diastolic blood pressure, triglycerides, low-density-lipoprotein-cholesterol, nonesterified fatty acids, homocysteine, or heart rate recovery. The response of circulating cortisol to low-dose dexamethasone had no significant correlation with any of the cardiovascular risk markers.

CONCLUSIONS:

Short-term glucocorticoids elicits both favorable and unfavorable effects on different cardiovascular risk factors. Manipulation of specific glucocorticoid-responsive physiological pathways deserves further study.

PMID:
15769980
DOI:
10.1210/jc.2004-2379
[Indexed for MEDLINE]

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