Graves' disease, also known as diffuse toxic goiter, is characterized by pathological activation of thyroid function.
The disease is autoimmune. Autoantibodies are produced against one of the structural components of the thyroid gland (thyroid-stimulating hormone receptors), which causes the gland to become abnormally activated and produce excess hormones.
The leading manifestations of Graves' disease are:
- Hyperthyroidism
- Diffuse gout (The thyroid gland is enlarged in size)
- Graves' orbitopathy (characteristic changes in the eyes) – which are not always apparent
Treatment options
After confirming the diagnosis, a treatment method must be chosen.
According to the American Thyroid Association guidelines, a choice should be made between three currently available methods for managing Graves' disease. These are:
- Radioiodine therapy
- Use of antithyroid medications
- Thyroidectomy – surgical removal of the thyroid gland
The choice of treatment is decided jointly by the doctor and the informed patient. The following should be considered:
- The issue of local availability of the method
- The length of time required to achieve the desired treatment effect
- Estimated recovery period after treatment
- Advantages of the method
- Potential side effects
- Cost
According to studies, the quality of life in the future is equal when all three of these treatment methods are used.
Radioiodine therapy
The essence of the method is as follows: the patient receives a selected dose of radioactive iodine, which, after entering the body, is absorbed by the cells of the thyroid gland. The iodine that enters here, due to its radioactivity, begins to destroy the cells, and as a result, the thyroid gland stops functioning/producing hormones.
Although the word "radioactive" may sound alarming, this method has been successfully used in medicine for several decades and is considered a safe and effective way to treat Graves' disease and malignant thyroid tumors.
Clinical situations that justify choosing this method of therapy and patients who are good candidates for radioiodine therapy:
- A woman who wants to become pregnant in the near future (must be at least 6 months post-radioiodine therapy)
- Patients with comorbidities that increase the risks of surgical intervention
- Patients who have had previous surgery or radiation to the neck area
- Lack of access to a surgeon with adequate experience in thyroid surgery
- Patients in whom antithyroid medications are contraindicated or in whom the desired results have not been achieved with these medications
- Patients with periodic thyrotoxic hypokalemic paralysis
Radioiodine therapy is contraindicated in patients, Who are:
- Pregnant women
- Breastfeeding mothers
- Women planning a pregnancy within the next 4-6 months
- Individuals who are unable to follow safety recommendations following radioiodine therapy
- In the presence of confirmed or suspected thyroid malignancy in conjunction with Graves' disease
When choosing this treatment method, the patient has a high priority:
- Effective complete control of hyperthyroidism
- Avoiding surgical intervention
- Avoiding the side effects of antithyroid drugs
Disadvantages:
- The need to take thyroid hormone medication for the rest of your life
- Relatively slow resolution of thyrotoxicosis
- Potential for the development or exacerbation of Graves' orbitopathy
Treatment with antithyroid medications
This type of medication blocks the process of hormone synthesis in the thyroid gland and ensures the normalization of laboratory parameters and the elimination of symptoms of hyperthyroidism when taken in appropriate doses.
Treatment continues for at least 12-18 months. After this period, if laboratory data allow, the medication can be discontinued.
In some cases, stopping treatment may result in remission – the disease going into remission. This period can last from a few months to a few years. Years later, there is still a chance that the symptoms of the disease will return.
Suitable candidates for this treatment option are::
- Patients who have a high probability of remission (temporary cessation of the disease). These are: patients, especially women, with a mild course of the disease, small goiter size, slightly elevated or negative levels of antibodies against thyroid receptors
- Pregnant women
- Elderly or younger patients who have high surgical risks or a reduced life expectancy due to comorbidities
- Individuals who are unable to follow safety recommendations following radioiodine therapy
- Patients who have previously undergone thyroid surgery
- Patients who do not have access to an experienced thyroid surgeon
- Patients with moderate to severe Graves' orbitopathy
- Patients who require rapid relief of symptoms of thyrotoxicosis.
Contraindications to the method:
- The main contraindication to the use of antithyroid medications is a history of their side effects.
Advantages of the method:
- The probability of achieving disease remission
- Avoiding the need to take thyroid hormones for the rest of your life
- Avoiding surgical intervention
- Avoiding radioactive iodine exposure
Disadvantages:
- Side effects typical of medications
- Possibility of disease recurrence after treatment discontinuation
Surgical removal of the thyroid gland
Surgical intervention for Graves' disease involves the complete removal of the glandular tissue.
Surgical method The candidates eligible for election are::
- Women who are planning a pregnancy in less than 6 months (this includes the period needed for hormonal levels to adjust)
- Patients with large goiters presenting with compression symptoms
- Low radioactive iodine uptake rate
- When thyroid cancer is confirmed or suspected
- In the case of non-functional or low-functioning nodules, especially if their size is greater than 4 cm
- If there is concomitant hyperparathyroidism (parathyroid disease) that requires surgical intervention
- If the level of antibodies against thyroid-stimulating hormone receptors is very high
- If treatment with antithyroid drugs does not produce remission
- Patients with moderate to severe Graves' orbitopathy.
Contraindications to surgical intervention:
- Severe concomitant diseases
- Lack of access to a surgeon experienced in thyroid surgery
- Pregnancy is only a partial contraindication. Surgical intervention is performed only when rapid relief of thyrotoxicosis is required and medication is not possible. The second trimester is a relatively safe period for surgical intervention.
Advantages of the method:
- Continuous tight control of hyperthyroidism
- Avoiding radioactive iodine exposure
- Avoiding possible side effects of antithyroid medications
Disadvantages:
- Potential risks associated with surgical intervention
- The need for ongoing thyroid hormone replacement therapy.
Author: Elga Giorgadze (Endocrinologist)