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Long-term follow-up of antithyroid peroxidase antibodies in patients with chronic autoimmune thyroiditis (Hashimoto's thyroiditis) treated with levothyroxine.
Thyroid 2008; 18(7):755-60T

Abstract

BACKGROUND

A number of studies show that the serum levels of antithyroid peroxidase antibodies (TPO-Ab) in patients with Hashimoto's thyroiditis decline during levothyroxine treatment, but do not provide quantitative data or report the fraction of patients in whom test for TPO-Ab became negative ("normalization percentage"). The objective of the present study was to provide this information.

METHODS

This was a retrospective study of TPO-Ab concentrations in 36 women and 2 men (mean age 51 +/- 16 years; range 19-81 years) with Hashimoto's thyroiditis as defined by the following criteria: elevated plasma TPO-Ab and typical hypoechogenicity of the thyroid in high-resolution sonography at first presentation or during follow-up and low pertechnetate uptake in thyroid scintigraphy. When first studied 17 women and 1 man were not yet taking levothyroxine. The remaining 20 patients were receiving levothyroxine. At initial examination 18 patients had serum thyroid-stimulating hormone (TSH) concentrations above normal. Results of up to eight (mean = 5.8) measurements obtained over a mean period of 50 months while patients were receiving levothyroxine were analyzed. In addition, serum TSH, free triiodothyronine (fT3), and free thyroxine (fT4) were measured, and ultrasound of the neck was performed at each follow-up examination.

RESULTS

In terms of TPO-Ab levels, 35 of 38 patients (92%) had a decrease, 2 patients had undulating levels, and 1 patient had an inverse hyperbolic increase in her TPO-Ab levels. In the 35 patients in whom there were decreasing TPO-Ab values, the mean of the first value was 4779 IU/mL with an SD of 4099 IU/mL. The mean decrease after 3 months was 8%, and after 1 year it was 45%. Five years after the first value, TPO-Ab levels were 1456 +/- 1219 IU/mL, a decrease of 70%. TPO-Ab levels became negative, < 100 IU/mL, in only six patients, a normalization percentage of 16%. There were no correlations between changes in thyroid volume and changes in TPO-Ab.

CONCLUSION

Serum TPO-Ab levels decline in most patients with Hashimoto's thyroiditis who are taking levothyroxine, but after a mean of 50 months, TPO-Ab became negative in only a minority of patients.

Authors+Show Affiliations

Department of Nuclear Medicine, University of Cologne, Cologne, Germany. matthias.schmidt@uni-koeln.deNo affiliation info availableNo affiliation info availableNo affiliation info availableNo affiliation info availableNo affiliation info availableNo affiliation info available

Pub Type(s)

Journal Article

Language

eng

PubMed ID

18631004

Citation

Schmidt, Matthias, et al. "Long-term Follow-up of Antithyroid Peroxidase Antibodies in Patients With Chronic Autoimmune Thyroiditis (Hashimoto's Thyroiditis) Treated With Levothyroxine." Thyroid : Official Journal of the American Thyroid Association, vol. 18, no. 7, 2008, pp. 755-60.
Schmidt M, Voell M, Rahlff I, et al. Long-term follow-up of antithyroid peroxidase antibodies in patients with chronic autoimmune thyroiditis (Hashimoto's thyroiditis) treated with levothyroxine. Thyroid. 2008;18(7):755-60.
Schmidt, M., Voell, M., Rahlff, I., Dietlein, M., Kobe, C., Faust, M., & Schicha, H. (2008). Long-term follow-up of antithyroid peroxidase antibodies in patients with chronic autoimmune thyroiditis (Hashimoto's thyroiditis) treated with levothyroxine. Thyroid : Official Journal of the American Thyroid Association, 18(7), pp. 755-60. doi:10.1089/thy.2008.0008.
Schmidt M, et al. Long-term Follow-up of Antithyroid Peroxidase Antibodies in Patients With Chronic Autoimmune Thyroiditis (Hashimoto's Thyroiditis) Treated With Levothyroxine. Thyroid. 2008;18(7):755-60. PubMed PMID: 18631004.
* Article titles in AMA citation format should be in sentence-case
TY - JOUR T1 - Long-term follow-up of antithyroid peroxidase antibodies in patients with chronic autoimmune thyroiditis (Hashimoto's thyroiditis) treated with levothyroxine. AU - Schmidt,Matthias, AU - Voell,Michael, AU - Rahlff,Ilka, AU - Dietlein,Markus, AU - Kobe,Carsten, AU - Faust,Michael, AU - Schicha,Harald, PY - 2008/7/18/pubmed PY - 2008/10/4/medline PY - 2008/7/18/entrez SP - 755 EP - 60 JF - Thyroid : official journal of the American Thyroid Association JO - Thyroid VL - 18 IS - 7 N2 - BACKGROUND: A number of studies show that the serum levels of antithyroid peroxidase antibodies (TPO-Ab) in patients with Hashimoto's thyroiditis decline during levothyroxine treatment, but do not provide quantitative data or report the fraction of patients in whom test for TPO-Ab became negative ("normalization percentage"). The objective of the present study was to provide this information. METHODS: This was a retrospective study of TPO-Ab concentrations in 36 women and 2 men (mean age 51 +/- 16 years; range 19-81 years) with Hashimoto's thyroiditis as defined by the following criteria: elevated plasma TPO-Ab and typical hypoechogenicity of the thyroid in high-resolution sonography at first presentation or during follow-up and low pertechnetate uptake in thyroid scintigraphy. When first studied 17 women and 1 man were not yet taking levothyroxine. The remaining 20 patients were receiving levothyroxine. At initial examination 18 patients had serum thyroid-stimulating hormone (TSH) concentrations above normal. Results of up to eight (mean = 5.8) measurements obtained over a mean period of 50 months while patients were receiving levothyroxine were analyzed. In addition, serum TSH, free triiodothyronine (fT3), and free thyroxine (fT4) were measured, and ultrasound of the neck was performed at each follow-up examination. RESULTS: In terms of TPO-Ab levels, 35 of 38 patients (92%) had a decrease, 2 patients had undulating levels, and 1 patient had an inverse hyperbolic increase in her TPO-Ab levels. In the 35 patients in whom there were decreasing TPO-Ab values, the mean of the first value was 4779 IU/mL with an SD of 4099 IU/mL. The mean decrease after 3 months was 8%, and after 1 year it was 45%. Five years after the first value, TPO-Ab levels were 1456 +/- 1219 IU/mL, a decrease of 70%. TPO-Ab levels became negative, < 100 IU/mL, in only six patients, a normalization percentage of 16%. There were no correlations between changes in thyroid volume and changes in TPO-Ab. CONCLUSION: Serum TPO-Ab levels decline in most patients with Hashimoto's thyroiditis who are taking levothyroxine, but after a mean of 50 months, TPO-Ab became negative in only a minority of patients. SN - 1050-7256 UR - https://www.unboundmedicine.com/medline/citation/18631004/Long_term_follow_up_of_antithyroid_peroxidase_antibodies_in_patients_with_chronic_autoimmune_thyroiditis__Hashimoto's_thyroiditis__treated_with_levothyroxine_ L2 - https://www.liebertpub.com/doi/full/10.1089/thy.2008.0008?url_ver=Z39.88-2003&amp;rfr_id=ori:rid:crossref.org&amp;rfr_dat=cr_pub=pubmed DB - PRIME DP - Unbound Medicine ER -