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Refractory hypothyroidism (RF) defined as raised serum levels of thyroid stimulating hormone (TSH) above upper limit of the reference range with or without the persistence of hypothyroid symptoms following a 6-week interval after the dosage was last increased to upper limits of dose per age. The most common cause of RH is inadequate compliance. In addition, diet, concomitant medication interactions, and gastrointestinal diseases can all result in l-thyroxine (LT4) malabsorption, which can cause RH. Moreover, weight gain, switching brands of LT4, poor storage of LT4, chronic liver disorders, cystic fibrosis, nephrotic syndrome, consumptive hypothyroidism, Addison’s disease are significant contributors to RF in children. RH in children is frequently asymptomatic, when symptoms do occur, they are typically minor and resemble those of hypothyroidism. It is essential to identify RH early and treat its underlying cause in order to avoid overusing LT4, which can lead to cardiac and bone problems. Endocrinologists should handle children who they suspect of having RH methodically after making sure there is enough compliance. Searching for undiagnosed illnesses and/or other factors that can affect LT4 absorption could be part of this. We present this review after an extensive literature search and long-standing clinical experience. This review’s objective is to shed light on the causes, clinical manifestations, investigations, and treatment of RH in children.
Refractory hypothyroidism (RF) defined as raised serum levels of thyroid stimulating hormone (TSH) above upper limit of the reference range with or without the persistence of hypothyroid symptoms following a 6-week interval after the dosage was last increased to upper limits of dose per age. The most common cause of RH is inadequate compliance. In addition, diet, concomitant medication interactions, and gastrointestinal diseases can all result in l-thyroxine (LT4) malabsorption, which can cause RH. Moreover, weight gain, switching brands of LT4, poor storage of LT4, chronic liver disorders, cystic fibrosis, nephrotic syndrome, consumptive hypothyroidism, Addison’s disease are significant contributors to RF in children. RH in children is frequently asymptomatic, when symptoms do occur, they are typically minor and resemble those of hypothyroidism. It is essential to identify RH early and treat its underlying cause in order to avoid overusing LT4, which can lead to cardiac and bone problems. Endocrinologists should handle children who they suspect of having RH methodically after making sure there is enough compliance. Searching for undiagnosed illnesses and/or other factors that can affect LT4 absorption could be part of this. We present this review after an extensive literature search and long-standing clinical experience. This review’s objective is to shed light on the causes, clinical manifestations, investigations, and treatment of RH in children.
Background: Congenital hypothyroidism is the most common preventable and treatable cause of intellectual disability in children. A key component of the surveillance system for congenital hypothyroidism is ensuring a regular treatment program for affected children. Despite nearly 20 years since the successful implementation of the newborn screening program for hypothyroidism in Iran, a comprehensive evaluation of patients' adherence to treatment has not been conducted. Objectives: The aim of this study was to investigate the adherence to treatment among patients with congenital hypothyroidism in Iran. Methods: In this national cross-sectional study conducted in 2024, the adherence to treatment of 400 children with congenital hypothyroidism born between 2019 and 2023 in Iran was examined using the Morisky Medication Adherence Scale. The patients were randomly selected from national registry data. Data were analyzed using chi-squared tests, Fisher's exact test, and logistic regression in Stata software version 16. Results: The mean and standard deviation of medication adherence was 6.35 ± 1.41. Overall, adherence was good (≥ 6) in 284 (71.0%) of the study participants. In the univariate analysis, the most significant factors influencing adherence were place of residence, higher maternal education, lower paternal education, and type of congenital hypothyroidism (CH). In the multivariate analysis, children with permanent CH had good adherence, and parental education was not statistically significant (P > 0.05). Conclusions: The results of this study showed that medication compliance in more than two-thirds of hypothyroid children diagnosed by national newborn screening is good. Given the importance of treatment in these patients, it is recommended that intervention plans be implemented, including educational programs and active follow-up of patients to increase compliance.
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