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Keebaugh AE, DeMonaco SM, Panciera DL, Abbott JA, Boes KM, Menciotti G. Evaluation of hemostasis in hyperthyroid cats. J Vet Intern Med 2021; 35:2636-2645. [PMID: 34590754 PMCID: PMC8692217 DOI: 10.1111/jvim.16274] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/23/2021] [Revised: 09/12/2021] [Accepted: 09/14/2021] [Indexed: 11/28/2022] Open
Abstract
Background Hyperthyroid cats might have a predisposition to arterial thrombus formation. The mechanism for thrombogenesis currently is unknown but could be associated with systemic hypercoagulability as seen in hyperthyroid humans. Objective Our purpose was to evaluate markers of hemostasis in hyperthyroid cats compared to healthy cats, and in hyperthyroid cats before and after radioactive iodine treatment (RIT). Animals Twenty‐five cats with hyperthyroidism and 13 healthy euthyroid cats >8 years of age. Methods Prothrombin time (PT), activated partial thromboplastin time (aPTT), fibrinogen concentration, antithrombin (AT), D‐dimers, thrombin‐antithrombin complexes (TAT), von Willebrand Factor antigen (vWF : Ag), and activity of factors VIII and IX were measured. An echocardiogram was performed in all cats. Hemostatic markers and echocardiogram were evaluated again 6 to 9 months after successful RIT in 7 cats. Results Hyperthyroid cats had higher fibrinogen concentration (P < .0001), AT activity (P < .0001), and vWF : Ag concentration (P = .01) than healthy control cats with all results decreasing significantly post‐RIT. Hyperthyroid cats were not more likely to be in a hypercoaguable state than euthyroid cats (P = .08). Serum T4 concentration was not a predictor of a hypercoagulable state (P = .53). Conclusions and Clinical Importance Hyperthyroid cats have evidence of altered hemostasis that does not appear to be solely attributable to cardiac abnormalities, but no evidence of a hypercoagulable state. Findings suggest altered hemostasis resolves after RIT. Hyperthyroid cats could have endothelial dysfunction as indicated by increased vWF : Ag which could potentiate thrombogenesis.
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Affiliation(s)
- Audrey E Keebaugh
- Department of Small Animal Clinical Sciences, Virginia-Maryland College of Veterinary Medicine, Blacksburg, Virginia, USA
| | - Stefanie M DeMonaco
- Department of Small Animal Clinical Sciences, Virginia-Maryland College of Veterinary Medicine, Blacksburg, Virginia, USA
| | - David L Panciera
- Department of Small Animal Clinical Sciences, Virginia-Maryland College of Veterinary Medicine, Blacksburg, Virginia, USA
| | - Jonathan A Abbott
- Department of Small Animal Clinical Sciences, College of Veterinary Medicine, University of Tennessee, Knoxville, Tennessee, USA
| | - Katie M Boes
- Department of Biomedical Sciences & Pathobiology, Virginia-Maryland College of Veterinary Medicine, Blacksburg, Virginia, USA
| | - Giulio Menciotti
- Department of Small Animal Clinical Sciences, Virginia-Maryland College of Veterinary Medicine, Blacksburg, Virginia, USA
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Srisawat S, Sitasuwan T, Ungprasert P. Increased risk of venous thromboembolism among patients with hyperthyroidism: a systematic review and meta-analysis of cohort studies. Eur J Intern Med 2019; 67:65-69. [PMID: 31229403 DOI: 10.1016/j.ejim.2019.06.012] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 05/11/2019] [Revised: 05/31/2019] [Accepted: 06/14/2019] [Indexed: 01/21/2023]
Abstract
BACKGROUND Studies have suggested that patients with hyperthyroidism may have a higher risk of venous thromboembolism (VTE) compared to individuals with normal thyroid function, although the data is quite limited. This systematic review and meta-analysis aims to comprehensively investigate this risk by summarizing all available studies. METHODS A systematic review was performed using the MEDLINE and Embase databases from inception to February 2019 to identify all cohort studies that compared the risk of incident VTE in patients with hyperthyroidism versus individuals without hyperthyroidism. Pooled risk ratio and 95% confidence interval were calculated using random-effect, generic inverse-variance method. RESULTS A total of 5 retrospective cohort studies with 237,667 cases with hyperthyroidism and 4,615,907 comparators without hyperthyroidism were included. The pooled analysis found a significantly increased risk of incident VTE among patients with hyperthyroidism, with a pooled risk ratio of 1.332 (95% CI, 1.275-1.391; I2 14%). The funnel plot was asymmetric and may suggest the presence of publication bias in favor of studies that showed positive association. CONCLUSION A significantly increased risk of incident VTE among patients with hyperthyroidism compared to individuals without hyperthyroidism was demonstrated in this meta-analysis.
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Affiliation(s)
| | - Tullaya Sitasuwan
- Division of Ambulatory Medicine, Department of Medicine, Faculty of Medicine Siriraj Hospital, Mahidol University, Bangkok, Thailand
| | - Patompong Ungprasert
- Clinical Epidemiology Unit, Department of Research and Development, Faculty of Medicine Siriraj Hospital, Mahidol University, Bangkok, Thailand.
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Bano A, Chaker L, de Maat MPM, Atiq F, Kavousi M, Franco OH, Mattace-Raso FUS, Leebeek FWG, Peeters RP. Thyroid Function and Cardiovascular Disease: The Mediating Role of Coagulation Factors. J Clin Endocrinol Metab 2019; 104:3203-3212. [PMID: 30938758 DOI: 10.1210/jc.2019-00072] [Citation(s) in RCA: 15] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 01/09/2019] [Accepted: 03/27/2019] [Indexed: 12/31/2022]
Abstract
CONTEXT Mechanisms linking high and high-normal thyroid function to increased cardiovascular risk remain unclear. Hypothetically, coagulation can play a role. OBJECTIVE To investigate (i) the association of thyroid function with coagulation factors and (ii) whether coagulation factors mediate the association of thyroid function with cardiovascular disease (CVD). DESIGN AND SETTING Rotterdam Study, a population-based prospective study. PARTICIPANTS AND MAIN OUTCOME MEASURES In 5918 participants (mean age, 69.1 years), we measured TSH, free T4 (FT4), and coagulation factors [von Willebrand factor antigen (VWF:Ag), ADAMTS13 activity, fibrinogen]. Participants were followed up for the occurrence of cardiovascular events and deaths. Associations of thyroid function with coagulation factors (standardized z scores) and CVD were assessed through linear regression and Cox proportional hazards models, adjusted for potential confounders. We performed causal mediation analyses to evaluate whether the effect of thyroid function on CVD is mediated by coagulation. RESULTS Higher FT4 levels were associated with higher VWF:Ag (β = 0.34; 95% CI = 0.22, 0.47), lower ADAMTS13 activity (β = -0.22; 95%CI = -0.35, -0.09), and higher fibrinogen (β = 0.26; 95% CI = 0.13, 0.39); 857 incident cardiovascular events and 690 cardiovascular deaths occurred. FT4 levels were positively associated with cardiovascular events and deaths. The effect of FT4 on incident cardiovascular events was minimally mediated by fibrinogen (1.6%) but not by VWF:Ag and ADAMTS13. VWF:Ag and fibrinogen together mediated 10.0% of the effect of FT4 on cardiovascular deaths. CONCLUSIONS Higher FT4 levels were associated with higher VWF:Ag, lower ADAMTS13 activity, and higher fibrinogen levels, indicating a procoagulant state. VWF:Ag and fibrinogen explained up to 10% of the link between FT4 and CVD.
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Affiliation(s)
- Arjola Bano
- Department of Internal Medicine, Netherlands Academic Center for Thyroid Diseases, Erasmus Medical Center, Rotterdam, Netherlands
- Department of Epidemiology, Erasmus Medical Center, Rotterdam, Netherlands
- Institute of Social and Preventive Medicine, University of Bern, Bern, Switzerland
- Department of Cardiology, Inselspital, Bern University Hospital, University of Bern, Bern, Switzerland
| | - Layal Chaker
- Department of Internal Medicine, Netherlands Academic Center for Thyroid Diseases, Erasmus Medical Center, Rotterdam, Netherlands
- Department of Epidemiology, Erasmus Medical Center, Rotterdam, Netherlands
| | - Moniek P M de Maat
- Department of Hematology, Erasmus Medical Center, Rotterdam, Netherlands
| | - Ferdows Atiq
- Department of Hematology, Erasmus Medical Center, Rotterdam, Netherlands
| | - Maryam Kavousi
- Department of Epidemiology, Erasmus Medical Center, Rotterdam, Netherlands
| | - Oscar H Franco
- Department of Epidemiology, Erasmus Medical Center, Rotterdam, Netherlands
- Institute of Social and Preventive Medicine, University of Bern, Bern, Switzerland
| | | | - Frank W G Leebeek
- Department of Hematology, Erasmus Medical Center, Rotterdam, Netherlands
| | - Robin P Peeters
- Department of Internal Medicine, Netherlands Academic Center for Thyroid Diseases, Erasmus Medical Center, Rotterdam, Netherlands
- Department of Epidemiology, Erasmus Medical Center, Rotterdam, Netherlands
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Zaane BV, Romualdi E, Brandjes D, Gerdes V, Squizzato A, Stuijver D. The effect of hyperthyroidism on procoagulant, anticoagulant and fibrinolytic factors. Thromb Haemost 2017; 108:1077-88. [DOI: 10.1160/th12-07-0496] [Citation(s) in RCA: 70] [Impact Index Per Article: 10.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/18/2012] [Accepted: 08/10/2012] [Indexed: 11/05/2022]
Abstract
SummarySeveral coagulation and fibrinolytic parameters appear to be affected by thyroid hormone excess;however, the net effect on the haemostatic system remains unclear. We aimed to update our previous review and systematically summarise and meta-analyse the data by assessing the effects of thyrotoxicosis on the coagulation and fibrinolytic system in vivo. Data sources included MEDLINE (2006–2012), EMBASE (2006–2012), and reference lists. The sources were combined with our previous search containing studies from 1980–2006. Eligible studies were all observational or experimental studies. Two investigators independently extracted data and rated study quality. Weighted mean proportion and 95% confidence intervals were calculated and pooled using a fixed and a random-effects model. A total of 29 articles consisting of 51 studies were included, as in several articles more than one study was described. We included four intervention (before and after treatment in hyperthyroid patients), five cross-sectional (hyperthyroid subjects and euthyroid controls), and four experimental (before and after use of thyroid hormone in euthyroid subjects) medium/high quality studies for meta-analysis. We found that thyrotoxicosis shifts the haemostatic balance towards a hypercoagulable and hypofibrinolytic state with a rise in factors VIII and IX, fibrinogen, von Willebrand factor, and plasminogen activator inhibitor-1. This was observed in endogenous and exogenous thyrotoxicosis, and in subclinical as well as overt hyperthyroidism. We conclude that both subclinical and overt hyperthyroidism induce a prothrombotic state, which is therefore likely to be a risk factor for venous thrombosis.
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Salloum-Asfar S, Boelen A, Reitsma PH, van Vlijmen BJM. The immediate and late effects of thyroid hormone (triiodothyronine) on murine coagulation gene transcription. PLoS One 2015; 10:e0127469. [PMID: 26011296 PMCID: PMC4444115 DOI: 10.1371/journal.pone.0127469] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/05/2015] [Accepted: 04/15/2015] [Indexed: 11/18/2022] Open
Abstract
Thyroid dysfunction is associated with changes in coagulation. The aim of our study was to gain more insight into the role of thyroid hormone in coagulation control. C57Black/6J mice received a low-iodine diet and drinking water supplemented with perchlorate to suppress endogenous triiodothyronine (T3) and thyroxine (T4) production. Under these conditions, the impact of exogenous T3 on plasma coagulation, and hepatic and vessel-wall-associated coagulation gene transcription was studied in a short- (4 hours) and long-term (14 days) setting. Comparing euthyroid conditions (normal mice), with hypothyroidism (conditions of a shortage of thyroid hormone) and those with replacement by incremental doses of T3, dosages of 0 and 0.5 μg T3/mouse/day were selected to study the impact of T3 on coagulation gene transcription. Under these conditions, a single injection of T3 injection increased strongly hepatic transcript levels of the well-characterized T3-responsive genes deiodinase type 1 (Dio1) and Spot14 within 4 hours. This coincided with significantly reduced mRNA levels of Fgg, Serpinc1, Proc, Proz, and Serpin10, and the reduction of the latter three persisted upon daily treatment with T3 for 14 days. Prolonged T3 treatment induced a significant down-regulation in factor (F) 2, F9 and F10 transcript levels, while F11 and F12 levels increased. Activity levels in plasma largely paralleled these mRNA changes. Thbd transcript levels in the lung (vessel-wall-associated coagulation) were significantly up-regulated after a single T3 injection, and persisted upon prolonged T3 exposure. Two-week T3 administration also resulted in increased Vwf and Tfpi mRNA levels, whereas Tf levels decreased. These data showed that T3 has specific effects on coagulation, with Fgg, Serpinc1, Proc, Proz, Serpin10 and Thbd responding rapidly, making these likely direct thyroid hormone receptor targets. F2, F9, F10, F11, F12, Vwf, Tf and Tfpi are late responding genes and probably indirectly modulated by T3.
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Affiliation(s)
- Salam Salloum-Asfar
- Einthoven Laboratory for Experimental Vascular Medicine, Department of Thrombosis and Hemostasis, Leiden University Medical Center, Leiden, the Netherlands
- Department of Hematology and Medical Oncology, Centro Regional de Hemodonación, IMIB-Arrixaca, University of Murcia, Murcia, Spain
| | - Anita Boelen
- Department of Endocrinology and Metabolism, Academic Medical Center, University of Amsterdam, Amsterdam, the Netherlands
| | - Pieter H. Reitsma
- Einthoven Laboratory for Experimental Vascular Medicine, Department of Thrombosis and Hemostasis, Leiden University Medical Center, Leiden, the Netherlands
| | - Bart J. M. van Vlijmen
- Einthoven Laboratory for Experimental Vascular Medicine, Department of Thrombosis and Hemostasis, Leiden University Medical Center, Leiden, the Netherlands
- * E-mail:
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Van Zaane B, Squizzato A, Debeij J, Dekkers OM, Meijers JCM, Van Zanten AP, Büller HR, Gerdes VEA, Cannegieter SC, Brandjes DPM. Alterations in coagulation and fibrinolysis after levothyroxine exposure in healthy volunteers: a controlled randomized crossover study. J Thromb Haemost 2011; 9:1816-24. [PMID: 21729238 DOI: 10.1111/j.1538-7836.2011.04430.x] [Citation(s) in RCA: 32] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
Abstract
BACKGROUND Several hemostatic abnormalities have been reported in hyperthyroidism, but the overall effect of thyroid hormone excess on coagulation and fibrinolysis is unclear. OBJECTIVE Our aim was to assess whether the use of supraphysiological doses of levothyroxine leads to coagulation activation and inhibition of fibrinolysis. PATIENTS AND METHODS Healthy volunteers were randomized to receive levothyroxine or no medication for 14 days with a washout period of at least 28 days in a crossover design. To study the effects of different degrees of thyroid hormone excess, 16 participants received levothyroxine in a dose of 0.3 mg per day, and 12 received levothyroxine 0.45 or 0.6 mg per day depending on body weight. Several variables of coagulation and fibrinolysis were measured. RESULTS Levels of von Willebrand factor activity (VWF:RiCo) and antigen (VWF:Ag), factor (F) VIII, plasminogen activator inhibitor-1 (PAI-1) and clot-lysis time were slightly higher after levothyroxine 0.3 mg per day than after the control situation, but only levels of VWF showed a significant increase from baseline. After levothyroxine 0.45 or 0.6 mg per day, levels of fibrinogen increased by 17%, VWF activity by 24%, VWF antigen by 26%, FVIII by 19%, FIX by 14%, FX by 7%, PAI-1 by 116% and clot-lysis time by 14%, and activated partial thromboplastin time decreased by 3%; all were significant changes compared with the control situation. We did not observe clear evidence of coagulation activation. CONCLUSIONS Our data suggest that thyroid hormone excess increases coagulation factor levels and inhibits fibrinolysis in a dose-dependent fashion. This implies an increased risk of venous thrombosis during hyperthyroidism.
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Affiliation(s)
- B Van Zaane
- Department of Internal Medicine, Slotervaart Hospital, Amsterdam, the Netherlands.
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Mihrshahi R, Lewis JG, Ali SO. Hormonal effects on the secretion and glycoform profile of corticosteroid-binding globulin. J Steroid Biochem Mol Biol 2006; 101:275-85. [PMID: 17029948 DOI: 10.1016/j.jsbmb.2006.06.031] [Citation(s) in RCA: 17] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/19/2022]
Abstract
Corticosteroid-binding globulin (CBG) is a plasma glycoprotein that is primarily synthesized in the liver and binds cortisol and progesterone with high affinity. In this study, a CBG secreting hepatocellular carcinoma derived cell line (HepG2) was used to investigate the hormonal regulation of hepatic CBG synthesis. HepG2 cells were grown for 72 h in 30, 300 and 3000 nM concentrations of estradiol (E2), testosterone (T), insulin, thyroxin (T4) and dexamethasone (DMZ) and the secreted CBG quantified by a novel enzyme-linked immunosorbent assay (ELISA). Two-dimensional polyacrylamide gel electrophoresis (2D-PAGE) was carried out to determine the effects of these hormones on the relative distribution of CBG glycoforms. Insulin, T4 and high concentrations of E2 decreased the secretion of CBG by HepG2 cells (p<0.05). Ethanol, the solvent used for E2, T and DMZ, also significantly attenuated CBG secretion. 2D-PAGE resolved 13-14 glycoforms of CBG produced by HepG2 cells. Insulin caused a reduction in the synthesis of more acidic, while T4 and DMZ decreased the production of more basic CBG glycoforms. Stimulation with E2 resulted in the synthesis of additional isoforms of increased acidity, which may represent a type of CBG only seen during pregnancy in vivo. Possible physiological implications of these findings are discussed.
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Affiliation(s)
- Robin Mihrshahi
- Department of Biological Sciences, Macquarie University, Sydney, NSW 2109, Australia.
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Shih CH, Chen SL, Yen CC, Huang YH, Chen CD, Lee YS, Lin KH. Thyroid hormone receptor-dependent transcriptional regulation of fibrinogen and coagulation proteins. Endocrinology 2004; 145:2804-14. [PMID: 14977860 DOI: 10.1210/en.2003-1372] [Citation(s) in RCA: 77] [Impact Index Per Article: 3.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/19/2022]
Abstract
Thyroid hormone (T(3)) regulates growth, development, and differentiation. These activities are mediated by the nuclear thyroid hormone receptors (TRs), which belong to the steroid/TR superfamily of ligand-dependent transcription factors. The effect of T(3) treatment on target gene regulation was investigated in a TRalpha-overexpressing hepatoma cell line (HepG2-TRalpha), by performing cDNA microarrays. We demonstrate that 148 of the 7597 genes represented were up-regulated by T(3), including fibrinogen and several other components of the coagulation factor system. To confirm the microarray results, fibrinogen and a small number of the blood clotting components were further investigated using quantitative RT-PCR. The T(3)-induction ratios observed with quantitative RT-PCR for factors such as thrombin (8-fold), coagulation factor X (4.9-fold), and hepatoglobin (30-fold) were similar to those observed by the cDNA microarray analysis. Further investigation, using HepG2-TRalpha (cell lines, revealed a 2- to 3-fold induction of fibrinogen transcription after 24 h of T(3) treatment. In addition, T(3) treatment increased the level of fibrinogen protein expression 2.5- to 6-fold at 48 h. The protein synthesis inhibitor, cycloheximide, did not inhibit the induction of fibrinogen by T(3), indicating that this regulation was direct. Furthermore, transcription run-on experiments indicate that the induction of fibrinogen by T(3) is regulated largely at the level of transcription. Similar observations were made on the regulation of fibrinogen by T(3) using rats that received surgical thyroidectomy (TX) as an in vivo model. These results suggest that T(3) plays an important role in the process of blood coagulation and inflammation and may contribute to the understanding of the association between thyroid diseases and the misregulation of the inflammatory and clotting profile evident in the circulatory system of these patients.
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Affiliation(s)
- Chung-Hsuan Shih
- Department of Biochemistry, Chang-Gung University, 259 Wen-hwa 1 Road, Taoyuan, Taiwan 333, Republic of China
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Abstract
OBJECTIVE To review the current understanding of the pathophysiology of antithrombin deficiency and its role in congenital thrombophilia. Recommendations for diagnostic testing of antithrombin function and concentration, derived from the medical literature and consensus opinions of recognized experts in the field, are included. These recommendations specify whom, how, and when to test. DATA SOURCES Review of the published medical literature. DATA EXTRACTION AND SYNTHESIS A summary of the medical literature and proposed testing recommendations were prepared and presented at the College of American Pathologists Conference XXXVI: Diagnostic Issues in Thrombophilia. After discussion at the conference, consensus recommendations presented in this article were accepted after a two-thirds majority vote by the participants. CONCLUSIONS Antithrombin deficiency is an infrequent genetic abnormality that may be a significant contributing cause of thrombophilia. Antithrombin deficiency also may be observed in conjunction with other genetic or acquired risk factors. Assay of antithrombin plasma levels is appropriate in the laboratory evaluation of individuals with thrombophilia, preferably using a functional, amidolytic antithrombin assay. The diagnosis of antithrombin deficiency should be established only after other acquired causes of antithrombin deficiency, such as liver disease, consumptive coagulopathy, or heparin therapy, are excluded. A low antithrombin level should be confirmed with a subsequent assay on a fresh specimen, and family studies may be helpful to establish the diagnosis. Antigenic antithrombin assays may be of benefit in subclassification of the type of antithrombin deficiency and to confirm the decreased antithrombin level in patients with type I deficiency.
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Marques-Vidal P, Mazoyer E, Bongard V, Gourdy P, Ruidavets JB, Drouet L, Ferrières J. Prevalence of insulin resistance syndrome in southwestern France and its relationship with inflammatory and hemostatic markers. Diabetes Care 2002; 25:1371-7. [PMID: 12145237 DOI: 10.2337/diacare.25.8.1371] [Citation(s) in RCA: 107] [Impact Index Per Article: 4.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 02/03/2023]
Abstract
OBJECTIVE To assess the prevalence and relationships of insulin resistance syndrome (IRS) with inflammatory and hemostatic markers in a representative sample of the population of Southwestern France aged 35-64 years. RESEARCH DESIGN AND METHODS In this cross-sectional study, data were collected from 597 men and 556 women and were assessed regarding BMI, blood pressure, total and HDL cholesterol levels, triglyceride level, glucose level, plasma insulin level, white blood cell count, fibrinogen level, factor VII level, von Willebrand factor, C-reactive protein level, soluble intercellular adhesion molecule, soluble vascular cell adhesion molecule-1, and soluble CD(14). Insulin resistance was defined by homeostasis model assessment > or =3.8. RESULTS Prevalence of IRS was higher in men than in women (23 vs. 12%, respectively; P < 0.001) and increased with age in both sexes (9, 24, and 34% for age groups 35-44, 45-54, and 55-64 years, respectively, for men and 4, 10, and 21% for women). After adjusting for age, alcohol consumption, tobacco smoking, and also for menopause in women, subjects (men and women) with IRS had significantly higher white blood cell count, factor VII levels, coagulating factor VII levels, and C-reactive protein levels than the other subjects. In men, further increases in soluble intercellular adhesion molecule and soluble vascular cell adhesion molecule-1 were noted, whereas in women, the differences were borderline significant. Conversely, no differences were found in fibrinogen, von Willebrand factor, and soluble CD(14) in both sexes. CONCLUSIONS IRS is relatively common in residents of Southwestern France and is related to a deleterious increase in hemostatic and inflammatory parameters.
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Erem C, Ersoz HO, Karti SS, Ukinç K, Hacihasanoglu A, Değer O, Telatar M. Blood coagulation and fibrinolysis in patients with hyperthyroidism. J Endocrinol Invest 2002; 25:345-50. [PMID: 12030606 DOI: 10.1007/bf03344016] [Citation(s) in RCA: 94] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 10/25/2022]
Abstract
Several papers concerning abnormalities of blood coagulation and fibrinolysis during hyperthyroidism, have been published. Increased von Willebrand Factor (vWF) activity and high fibrinogen levels have been reported. However, there is controversy concerning the presence of a hypercoagulable state in hyperthyroidism. We investigated various hemostatic parameters in 41 hyperthyroid patients and compared them to 20 euthyroid controls. Prothrombin time (PT), activated partial thromboplastin time (aPTT), fibrinogen, factors V, VII, VIII, IX and X activities, vWF, antithrombin III (AT III), protein C, protein S, tissue plasminogen activator (t-PA) and tissue plasminogen activator inhibitor-1 (PAI-1), as well as common lipid variables, were measured. The relationships between serum thyroid hormones and these hemostatic parameters were examined. Compared with control subjects, fibrinogen, factor IX, vWF, AT III and PAI-1 were significantly increased in patients (p<0.05, p<0.0001, p<0.05, p<0.01 and p<0.0001; respectively), whereas factor X and t-PA were decreased (p<0.05). We showed that free T4 (FT3) levels were correlated with factor VIII activity (r=0.35, p<0.05). FT4, FT3 and TSH did not correlate with fibrinogen, vWF, AT III, t-PA, or PAI-1. AT III was inversely correlated with factor VII activity (r=-0.48, p<0.01). Protein C and S were correlated with vWF levels (r=0.58, p<0.0001; r=0.55, p<0.0001, respectively). Protein C was inversely correlated with t-PA (r=-0.39, p<0.01). There was a negative correlation between triglycerides, LDL-C and F X (r=-0.45, p<0.05; r=-64, p<0.01, respectively). Mean platelet volume (MPV) was correlated with anti-thyroid peroxidase (TPO) antibodies (in Graves'disease) and F IX activity (r=0.57, p<0.05 and r=0.39, p<0.05; respectively). We found important differences in the coagulatory /fibrinolytic parameters between the hyperthyroid patients and healthy controls. Hyperthyroid patients may experience vascular endothelial dysfunction and decreased fibrinolytic activity in blood. This endothelial activation may represent a situation with a higher thromboembolic potential.
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Affiliation(s)
- C Erem
- Division of Endocrinology and Metabolism, Faculty of Medicine, Karadeniz Technical University, Trabzon, Turkey.
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Burggraaf J, Lalezari S, Emeis JJ, Vischer UM, de Meyer PH, Pijl H, Cohen AF. Endothelial function in patients with hyperthyroidism before and after treatment with propranolol and thiamazol. Thyroid 2001; 11:153-60. [PMID: 11288984 DOI: 10.1089/105072501300042820] [Citation(s) in RCA: 75] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
Abstract
Hyperthyroidism is associated with a higher incidence of arterial thromboembolism; increasing age, atrial fibrillation, and mitral valve abnormalities are risk factors. However, the contribution of endogenous coagulation parameters is unclear. Because thyroid hormone influences receptor and transcription factors, it can be expected that it will influence proteins involved in coagulation processes synthetised in many cells. Fourteen hyperthyroid patients were studied untreated, after 1 week of treatment with propranolol, and after therapeutic treatment with thiamazol. Fourteen matched controls were used for comparison. On each occasion, endothelial marker proteins, coagulation/fibrinolysis factors, and inflammatory (liver) markers were measured. Excess thyroid hormone was associated with elevated levels of most endothelium-associated proteins. In addition, plasma fibronectin and fibrinogen were increased, while plasminogen was decreased. No evidence was found that hyperthyroidism was associated with coagulation/fibrinolysis activation, or with increased levels of the inflammation markers interleukin-6 (IL-6), tumor necrosis factor-alpha (TNF-alpha) or C-reactive protein (CRP). Propranolol treatment only lowered the von Willebrand factor propeptide, and slightly increased plasminogen. Treatment with thiamazol returned all parameters to normal. Hyperthyroidism increased the plasma levels of most endothelial marker proteins, and of some liver-synthetized proteins. No evidence for coagulation/fibrinolysis activation was found. However, it appears that endothelial activation, which is indicative of a procoagulant state, is present in hyperthyroidism. This may explain the association between hyperthyroidism and thromboembolism especially if other risk factors are present. von Willebrand factor II (vWF:Ag-II) levels may be suitable markers to evaluate acute changes in endothelial function because this parameter responds more rapidly to changes in endothelial function than other factors.
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Affiliation(s)
- J Burggraaf
- Centre for Human Drug Research, Genève, Switzerland.
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