Publicaciones científicas

A Cross-Sectional Study of the Association between Circulating TSH Level and Lipid Profile in a Large Spanish Population

Palacios SS, Larumbe AB, Guillén-Grima F, Galofré JC.
Department of Endocrinology and Nutrition, Clínica Universidad de Navarra. University of Navarra, Pamplona, Spain.

Revista: Clinica Endocrinology

Fecha: 29/03/2013

Medicina Preventiva Endocrinología y Nutrición

OBJECTIVE
Some evidence suggests that high serum TSH levels are associated with an adverse lipid profile but this association is not clear when plasma TSH is within the reference range. Nevertheless, these studies have never been conducted in Spain, a country with a strong adherence to the Mediterranean diet.

The study aim was to analyse the association between blood TSH levels and circulating lipids in a large Spanish population and set up a TSH reference range in different age, gender, and Body Mass Index (BMI) sub-populations from our cohort.

DESIGN
Cross-sectional study on 20,783 subjects.

PATIENTS
We analysed circulating levels of total cholesterol (TC), low-density lipoprotein cholesterol (LDLc), high-density lipoprotein cholesterol (HDLc) and triglycerides (TG) and compared them with TSH serum levels. Discriminant function analysis was used to determine the TSH cut-off level from where hyperlipidaemia developed.

RESULTS
In individuals free of thyroid dysfunction, the mean and the 95% TSH (mU/L) reference limits were 2.20 and 0.72-4.43, respectively. We observed a sex-related difference in TSH concentration (males, 2.07 and 0.72-4.29; females, 2.29 and 0.72-4.49; P <0.01). We also observed a weight-related difference in TSH concentration (BMI <30 Kg/m2 , 2.16 and 0.72-4.39; BMI ≥30 Kg/m2 , 2.28 and 0.71-4.47; P <0.01). TSH was positively associated with TC, TG and LDLc levels and negatively with HDLc.

CONCLUSION
We found an association between TSH and lipids in that as TSH increased, the lipid profile became less favourable, even within the normal range. Additionally, TSH reference ranges varied according to gender, age and BMI.

CITA DEL ARTÍCULO   2013 Mar 29. doi: 10.1111/cen.12216.

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