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J Vet Sci 2017; 18(4): 471-477  https://doi.org/10.4142/jvs.2017.18.4.471
Retrospective evaluation of circulating thyroid hormones in critically ill dogs with systemic inflammatory response syndrome
Massimo Giunti*, Roberta Troia, Mara Battilani, Luciana Giardino, Francesco Dondi, Giulia Andreani, Federico Fracassi
Department of Veterinary Medical Sciences, Alma Mater Studiorum-University of Bologna, 40126 Bologna, Italy
Correspondence to: Massimo Giunti
Tel: +39-5120973059; Fax: +39-512097593; E-mail: massimo.giunti@unibo.it
Received: February 2, 2016; Revised: August 9, 2016; Accepted: November 23, 2016; Published online: December 31, 2017.
Critical illness can be associated with transient alterations in circulating thyroid hormone concentrations, indicating the presence of non-thyroidal illness (NTI). NTI is well described in humans, but there are few reports on its occurrence and prognostic significance in dogs. This retrospective study assessed the occurrence of NTI in a population of dogs with systemic inflammatory response syndrome (SIRS) and investigated its association with disease severity (APPLEfast scores). A total of 41 SIRS dogs were included and were divided by SIRS origin (non-septic SIRS, n = 10; septic SIRS, n = 41) and final outcome (survivors, n = 37; non-survivors, n = 4). Healthy, age-matched dogs (n = 15) were included as controls. Serum thyroid hormone levels including total T3, free T3, total T4, and reverse T3 were measured upon admission. Compared to controls, there were significant changes in serum thyroid hormone concentrations in SIRS dogs, suggesting the presence of NTI. Septic SIRS dogs had higher APPLEfast scores and lower serum thyroid hormones concentrations than those in non-septic SIRS and control dogs. In conclusion, NTI was frequent in dogs with SIRS and may be associated with the presence of sepsis or high illness severity.
Keywords: canine, euthyroid sick syndrome, systemic inflammatory response syndrome, thyroid hormones

© 2017 The Korean Society of Veterinary Science.

This is an Open Access article distributed under the terms of the Creative Commons Attribution Non-Commercial License (http://creativecommons.org/licenses/by-nc/4.0) which permits unrestricted non-commercial use, distribution, and reproduction in any medium, provided the original work is properly cited.