Fallibility of postal questionnaire follow-up for detection of hypothyroidism after iodine-131 therapy
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Radioactive iodine treatment for thyrotoxicosis showed low hypothyroidism rates. However, postal questionnaires proved ineffective for long-term patient follow-up in this Melbourne study.
Area of Science:
- Endocrinology
- Nuclear Medicine
Background:
- Thyrotoxicosis is a common endocrine disorder.
- Radioactive iodine therapy is a standard treatment for thyrotoxicosis.
- Effective patient follow-up is crucial for assessing treatment outcomes and long-term health.
Purpose of the Study:
- To evaluate the incidence of hypothyroidism after radioactive iodine treatment for thyrotoxicosis.
- To assess the efficacy of postal questionnaires for long-term patient follow-up.
Main Methods:
- A cohort of 412 patients treated with radioactive iodine for thyrotoxicosis was studied.
- Follow-up was conducted over one to three years using postal questionnaires.
- Intensive efforts were made to trace patients lost to follow-up.
Main Results:
- Hypothyroidism was detected in only three patients (0.7%).
- A significant 41% of patients were lost to follow-up.
- Reasons for loss to follow-up included non-participation and change of address.
Conclusions:
- Radioactive iodine therapy for thyrotoxicosis appears to have a low risk of causing hypothyroidism.
- Postal questionnaires are an inadequate method for prolonged follow-up of patients in an inner-suburban population.
- Alternative, more robust follow-up strategies are needed for long-term patient monitoring.
Abstract:
Four hundred and twelve patients who received radioactive iodine for thyrotoxicosis were followed up for periods from one to three years by postal questionnaire. Hypothyroidism was detected in only three instances, and, despite intensive efforts to trace subjects, 41% of them were lost to follow-up because of either failure to participate or change of address over three years. It is apparent that a postal questionnaire is an unsatisfactory method for following up a Melbourne inner-suburban population over a prolonged period.