An Assessment of the Occurrence of Hypothyroidism in Patients Treated With RAI for Hyperthyroidism.

NCT ID: NCT04663451

Last Updated: 2021-04-19

Study Results

Results pending

The study team has not published outcome measurements, participant flow, or safety data for this trial yet. Check back later for updates.

Basic Information

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Recruitment Status

UNKNOWN

Total Enrollment

150 participants

Study Classification

OBSERVATIONAL

Study Start Date

2020-09-11

Study Completion Date

2021-05-31

Brief Summary

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Low RAIU in patients with hyperthyroidism represents a common obstacle in the treatment with RAI. Therefore, a higher dose of RAI must be administered to cure hyperthyroidism in these patients. If we treat patients with thiamazole before starting RAI treatment, serum TSH will rise and result in an increase in iodine uptake by the thyroid gland. By doing so, the dose of RAI to be administered might be lowered to achieve similar therapeutic efficacy.

In the past, either calculated or fixed doses of 131I have been used to treat hyperthyroidism. The supposed advantage of a calculated dose compared to a fixed dose is the lowering of hypothyroidism frequency. However, various research papers have contradicted this statement.

Antithyroid drugs and RAI therapy have been widely used in the past, either in combination, or independent from one another. This has been done primarily in older patients, to reduce the risk of exacerbation of hyperthyroid symptoms after initiation of RAI.

The use of propylthiouracil has been shown to decrease the response rate after RAI due to radioprotective effects.

The use of methimazole and carbimazole did not have a negative effect on treatment failure, as long as the medication was discontinued various days before RAI administration. Although this statement is contested in other studies.

It is interesting to evaluate retrospective data of patients treated with RAI to evaluate prognostic factors of treatment respons and post RAI hypothyroidism.

Detailed Description

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Conditions

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Nodule Solitary Thyroid Toxic Multinodular Goiter Radioactive Iodine-Induced Hypothyroidism

Study Design

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Observational Model Type

COHORT

Study Time Perspective

RETROSPECTIVE

Study Groups

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Toxic Nodule

Hyperthyroid patients with underlying toxic nodule

radioacive iodine therapy

Intervention Type RADIATION

Hyperthyroid patients who have undergone radioactive iodine treatment to cure them from their hyperthyroidism.

Toxic multinodular goiter

Hyperthyroid patients with underlying toxic multinodular goiter

radioacive iodine therapy

Intervention Type RADIATION

Hyperthyroid patients who have undergone radioactive iodine treatment to cure them from their hyperthyroidism.

Interventions

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radioacive iodine therapy

Hyperthyroid patients who have undergone radioactive iodine treatment to cure them from their hyperthyroidism.

Intervention Type RADIATION

Eligibility Criteria

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Inclusion Criteria

* Hyperthyroid patients, either subclinical or overt, who have undergone RAI treatment in the period of 2005-2015.

Exclusion Criteria

* Prior use of L-thyroxine
* Prior thyroid surgery
* Prior RAI treatment
* Patients with thyroiditis
Minimum Eligible Age

18 Years

Eligible Sex

ALL

Accepts Healthy Volunteers

No

Sponsors

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Universitair Ziekenhuis Brussel

OTHER

Sponsor Role lead

Responsible Party

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Brigitte Velkeniers

Head of the department of Internal Medicine and Endocrinology

Responsibility Role PRINCIPAL_INVESTIGATOR

Principal Investigators

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Corina Andreescu, Doctorate

Role: PRINCIPAL_INVESTIGATOR

Universitair Ziekenhuis Brussel

Locations

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Universitair Ziekenhuis Brussel

Brussels, , Belgium

Site Status

Countries

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Belgium

Other Identifiers

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2019/435

Identifier Type: -

Identifier Source: org_study_id

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