PMID: 15248821Jul 14, 2004Paper

Selenium substitution has no direct effect on thyroid hormone metabolism in critically ill patients

European Journal of Endocrinology
M W AngstwurmR Gaertner

Abstract

In severe illness, plasma selenium levels are decreased; a decreased activity of the selenoenzyme 5'-deiodinase has been hypothesized to contribute to low tri-iodothyronine (T3) levels in non-thyroidal illness (NTI) syndrome in these patients. To analyse the influence of selenium substitution on thyroid hormone metabolism in patients with severe sepsis. A prospective, randomized, controlled study at the medical internal intensive care unit of the University of Munich. Results are for 41 consecutive patients with severe sepsis with an APACHE II score >15. Patients received either sodium selenite (500 microg/day for the first 3 days, reducing to 250 and then 125 microg/day every 3 days) or a placebo. At study entry, APACHE II score and demographics were identical in both groups. The mean levels of TSH, free tri-iodithyronine and total T3, as well as plasma selenium and selenium-dependent peroxidase (GSH-Px) activity, were decreased. Plasma selenium and GSH-Px activity were normalized on days 3, 7 and 14 in patients receiving selenium (n=21), but remained below normal in the control patients. Patients receiving selenium had a better clinical outcome and thyroid hormone levels normalized earlier. Thyroid hormone levels increased in...Continue Reading

Citations

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