Effect of Short-Term Hypothyroid State on Lipid Profile and Cardiovascular Risk Markers in Subjects Preparing Radioactive Iodine Therapy.
10.11106/cet.2014.7.2.172
- Author:
Hye Ju YEO
1
;
A Ra JO
;
Hye Won LEE
;
Dong Won YI
;
Yang Ho KANG
;
Seok Man SON
Author Information
1. Department of Internal Medicine, Pusan National University School of Medicine, Yangsan, Korea. sonsm@pusan.ac.kr
- Publication Type:Original Article
- Keywords:
Short-term hypothyroidism;
Thyroid cancer;
Cardiovascular risk markers;
Radioactive iodine therapy
- MeSH:
Alanine Transaminase;
Apolipoprotein A-I;
Apolipoproteins;
Apolipoproteins B;
Aspartate Aminotransferases;
Bilirubin;
Body Mass Index;
C-Reactive Protein;
Cardiovascular Diseases;
Cholesterol;
Cohort Studies;
Cystatin C;
Diabetes Mellitus;
Homocysteine;
Humans;
Hypertension;
Hypothyroidism;
Iodine*;
Lipoprotein(a);
Reference Values;
Thyroid Neoplasms;
Thyrotropin;
Thyroxine;
Triglycerides;
Uric Acid
- From:Journal of Korean Thyroid Association
2014;7(2):172-179
- CountryRepublic of Korea
- Language:Korean
-
Abstract:
BACKGROUND AND OBJECTIVES: The relationship between short-term hypothyroidism due to levothyroxine (LT4) withdrawal for radioactive iodine (RI) therapy in patients with differentiated thyroid cancer (DTC) and risk of cardiovascular disease is not clear. In this study, we evaluated the impact of short-term overt hypothyroidism on lipid profiles and cardiovascular parameters in patients with DTC. MATERIALS AND METHODS: We recruited 195 patients with DTC who were preparing RI therapy from March 2008 to February 2012. We analyzed the effect of thyroid stimulating hormone (TSH) level on the clinical, biochemical, and cardiovascular risk markers at the end of LT4 withdrawal protocol (P2). RESULTS: After LT4 withdrawal (P2), TSH and total cholesterol (TC) levels were significantly increased (p<0.005). After adjustment for multiple factors such as age, sex, body mass index (BMI), hypertension and diabetes mellitus (DM), the positive relationship between TSH and TC remained significant (p=0.04). Mean levels of homocysteine, low density lipoprotein-cholesterol, triglyceride were increased. However, levels of high density lipoprotein-cholesterol, cystatin C, C-reactive protein, apolipoprotein B (ApoB), apolipoprotein A1 (Apo A1), lipoprotein (a) (Lp[a]), aspartate transaminase, alanine aminotransferase, total bilirubin, uric acid remained within normal range. Splitting the whole cohort into the three different age groups, serum Apo B, Lp(a) levels and BMI increased with increasing age (p<0.05). And splitting into three different TSH level groups (1st group; <79 microIU/mL, 2nd group; 79-121 microIU/mL, 3rd group; >121 microIU/mL), all values did not have a statistical significant meaning except Apo A1. CONCLUSION: Short-term hypothyroidism induced worsening of lipid metabolic parameters, but not enough to induce the cardiovascular risk in patients with thyroid cancer.
