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Journal of Thyroid Research
Volume 2017 (2017), Article ID 1924974, 9 pages
https://doi.org/10.1155/2017/1924974
Research Article

The End-Diastolic Velocity of Thyroid Arteries Is Strongly Correlated with the Peak Systolic Velocity and Gland Volume in Patients with Autoimmune Thyroiditis

1Ultrasound Unit, Department of Radiology, University of São Paulo Medical School, Clinics Hospital, 05403-000 São Paulo, SP, Brazil
2Thyroid Unit, Department of Endocrinology and Metabolism, University of São Paulo Medical School, Clinics Hospital, 05403-000 São Paulo, SP, Brazil
3Radiology Institute (InRad), Department of Radiology, University of São Paulo Medical School, Clinics Hospital, 05403-000 São Paulo, SP, Brazil

Correspondence should be addressed to Danilo Bianchini Höfling; rb.moc.lou@gnilfohbd

Received 6 May 2017; Accepted 1 August 2017; Published 14 September 2017

Academic Editor: Massimo Tonacchera

Copyright © 2017 Danilo Bianchini Höfling et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

Abstract

Background. The end-diastolic velocity (EDV) of thyroid arteries reflects peripheral blood flow resistance. Objective. The aim was to evaluate EDV correlations with other Doppler sonography parameters and with clinical and biochemical variables in a sample of patients with hypothyroidism caused by chronic autoimmune thyroiditis (CAT). Methods. A sample of 48 CAT hypothyroid patients receiving treatment with stable doses of levothyroxine was selected. The participants underwent clinical evaluation and measurement of serum thyrotropin (TSH), total triiodothyronine (T3), total thyroxine (T4), free T4, thyroid peroxidase antibodies (anti-TPO), and antithyroglobulin antibodies (anti-Tg) and Doppler sonography. Results. The EDV of the inferior thyroid arteries (ITA-EDV) was strongly and positively correlated with the peak systolic velocity of the inferior thyroid arteries (ITA-PSV, ), thyroid volume (), and thyroid visual vascularization pattern (TVP, ). There was no correlation between ITA-EDV and the clinical variables, hormones, anti-TPO, or anti-Tg. Conclusion. The strong correlation of ITA-EDV with ITA-PSV, TVP, and volume suggests that increased vascularization in CAT may be associated with a reduction in thyroid blood flow resistance, possibly due to an angiogenesis-induced increase in the total vascular cross-sectional area of the parenchyma.