Effects of levothyroxine treatment on biochemical and hemostasis parameters in patients with hypothyroidism
Abstract
Objective: The aims of the study were to evaluate the disturbances in the coagulation system in patients with overt hypothyroidism (OH), to assess the effects of levothyroxine (LT4) on the coagulation parameters, and to determine whether subclinical hypothyroidism (SH) affects concentrations of coagulation markers and several biochemical parameters, thereby supporting early substitution. Design: The study included 15 patients with SH (TSH levels 5–10 mU/l), 15 patients with OH and 15 euthyroid controls. Methods: Blood urea nitrogen, creatinine, creatine phosphokinase, aspartate aminotransferase, lactate dehydrogenase, total-cholesterol, high density lipoprotein-cholesterol, low density lipoprotein-cholesterol and triglyceride levels, and bleeding time, prothrombin time (PT), activated partial thromboplastin time (APTT), factor VIII activity, von Willebrand factor activity (vWF), platelet count and clotting time were evaluated just before and three months after the maintenance of euthyroidism with LT4 treatment. Results: Factor VIII and vWF activities were lower in patients with SH than in controls (P< 0.01). Increased bleeding time, PT, APTT and clotting time and decreased factor VIII activity and vWF activity were observed in patients with OH when compared with controls. Bleeding time, PT, APTT and clotting time decreased and factor VIII activity, vWF and platelet count increased after LT4 in patients with OH. Increases in factor VIII activity and vWF (P< 0.01) were detected also in the SH group with treatment. Conclusions: OH is associated with significant abnormalities in clotting parameters which are reversed by LT4. In contrast, SH is associated with minor changes in factor VIII activity and vWF which are reversible by LT4. Serum lipids and other measured parameters are not improved by LT4 in patients with TSH < 10 mU/l and these data fail to demonstrate a need to treat such patients.
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Correction of TSH levels to normal using LT4 replacement corrects these abnormalities.
“Correction of TSH levels to normal using LT4 replacement correct these abnormalities”
From Pharmacodynamic and Therapeutic Actions of Levothyroxine (2021) · cites this paper as [102]
Low levels of circulating thyroid hormone shift the haemostatic system to a hypocoagulable hyper-fibrinolytic state, with reduced Factors VIII, IX, and XI and von Willebrand factor that are normalised on LT4.
“low levels of circulating thyroid hormone shift the haemostatic system to a hypocoagulable hyper-fibrinolytic state, with reduced Factors VIII, IX, and XI and von Willebrand factor (VWF) that are normalised on LT4”
From Pharmacodynamic and Therapeutic Actions of Levothyroxine (2021) · cites this paper as [102]
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- Authors
- Gullu, S., Sav, H., & Kamel, N.
- Affiliations
- Ankara University (TR)
- ORCID
- Sav, Hasan
- Venue
- European Journal of Endocrinology
- Publisher
- Oxford University Press (OUP)
- Published
- 2005-03
- Volume
- 152
- Issue
- 3
- Pages
- 355-361
- ISSN
- 0804-4643 (ISSN-L)
- 1479-683X
- OpenAlex
- W2129985458
- Cited by
- 96
- References
- 41
- Citations by year
- 2025: 3 · 2024: 6 · 2023: 6 · 2022: 5 · 2021: 3 · 2020: 3 · 2019: 2 · 2018: 4 · 2017: 2 · 2016: 6 · 2015: 5 · 2014: 4 · 2013: 4 · 2012: 5
- FWCI
- 4.35
- Type
- journal article
- Language
- en
- Open access
- closed
- Locations
- European Journal of Endocrinology (publishedVersion)
- PubMed (publishedVersion)
- Topics
- Health Sciences › Medicine › Endocrinology, Diabetes and Metabolism › Thyroid Disorders and Treatments
- Health Sciences › Medicine › Hematology › Platelet Disorders and Treatments
- Health Sciences › Medicine › Hematology › Blood Coagulation and Thrombosis Mechanisms
- Keywords
- levothyroxine, overt hypothyroidism, subclinical hypothyroidism, coagulopathy, hemostasis, factor VIII activity, von Willebrand factor, bleeding time, prothrombin time, activated partial thromboplastin time, serum lipids, thyroid hormone replacement
- MeSH terms
- Adult, Aged, Factor VIII, Female, Hemostasis, Humans, Hypothyroidism, Middle Aged, Severity of Illness Index, Thyroid Function Tests, Thyroid Gland, Thyroxine, von Willebrand Factor
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