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Related Concept Videos

Hypothyroidism II: Pathophysiology01:23

Hypothyroidism II: Pathophysiology

Hypothyroidism is a disorder characterized by insufficient production of thyroid hormones, which regulate metabolism, energy balance, and multiple organ systems.TypesHypothyroidism is classified based on the level of dysfunction. Primary hypothyroidism results from intrinsic thyroid gland dysfunction, causing reduced hormone production despite normal or increased stimulation. Secondary hypothyroidism arises from inadequate thyroid-stimulating hormone (TSH) secretion by the pituitary. Tertiary...
Hyperthyroidism II: Pathophysiology01:27

Hyperthyroidism II: Pathophysiology

Hyperthyroidism is a hypermetabolic state caused by elevated levels of thyroid hormones, triiodothyronine (T3) and thyroxine (T4). It results from dysregulation at the thyroid, pituitary, or immune system level and affects multiple organ systems.PathophysiologyThe most common cause of hyperthyroidism is Graves’ disease, an autoimmune disorder in which antibodies, specifically thyroid-stimulating antibodies (TSAb), a subtype of TSH receptor antibodies (TRAb), bind to and activate TSH receptors...
Hyperthyroidism I: Introduction01:25

Hyperthyroidism I: Introduction

Hyperthyroidism is a type of thyrotoxicosis characterized by the thyroid gland's overproduction of the thyroid hormones triiodothyronine (T3) and thyroxine (T4). This hormone excess increases the basal metabolic rate and enhances sensitivity to catecholamines.DiagnosisDiagnosis is based on clinical features and biochemical testing. It typically shows suppressed thyroid-stimulating hormone (TSH) levels below 0.4 mIU/L, with elevated free T3 and/or T4. Additional tests, including thyroid...
Functions of Thyroid Hormones01:18

Functions of Thyroid Hormones

The thyroid hormone (TH) plays a pivotal role in the intricate orchestration of physiological processes, exerting profound effects on development, metabolism, and homeostasis throughout different life stages.
TH is indispensable for the normal development and maturation of the skeletal, muscular, and nervous systems during fetal and childhood growth. It facilitates bone mineral turnover and regulates protein synthesis in developing tissues, contributing significantly to overall growth and...
Synthesis and Regulation of Thyroid Hormones01:20

Synthesis and Regulation of Thyroid Hormones

Low blood levels of the thyroid hormones — triiodothyronine (T3) and thyroxine (T4) — signal the hypothalamus to release the thyrotropin-releasing hormone (TRH). TRH then reaches the pituitary gland and stimulates the release of thyroid-stimulating hormone(TSH) into the bloodstream.
Upon reaching the thyroid gland, TSH stimulates the follicular cells' active uptake of iodide ions from the blood. The ions diffuse to the apical surface of the cells and are oxidized to iodine. The iodine is then...
Graves Disease II: Pathophysiology01:24

Graves Disease II: Pathophysiology

Graves’ disease is an autoimmune disorder characterized by the production of thyroid-stimulating immunoglobulins (TSI) that activate TSH receptors, leading to excessive synthesis and release of thyroid hormones (T3 and T4) and resulting in hyperthyroidism.Among all causes of hyperthyroidism, Graves’ disease is the most common and can happen at any age, though it is more frequent in women. It produces a hypermetabolic state with features such as weight loss, tachycardia, tremor, and heat...

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Related Experiment Videos

Thyroid function: the complexity of maternal hypothyroidism during pregnancy.

Erik K Alexander

    Nature Reviews. Endocrinology
    |August 20, 2009
    PubMed
    Summary

    Managing levothyroxine dosage in pregnant women with hypothyroidism remains uncertain. The cause of hypothyroidism may guide optimal timing and duration for dose adjustments during pregnancy.

    Area of Science:

    • Endocrinology
    • Reproductive Medicine
    • Thyroidology

    Background:

    • Levothyroxine is a critical medication for managing hypothyroidism.
    • Pregnancy necessitates careful management of thyroid hormone levels.
    • Optimal levothyroxine dosage adjustments during pregnancy are not fully established.

    Discussion:

    • This retrospective review explores factors influencing levothyroxine management in pregnant hypothyroid patients.
    • The etiology of hypothyroidism is investigated as a potential factor in determining dosage adjustment strategies.
    • Understanding the cause of hypothyroidism may refine treatment protocols for pregnant individuals.

    Key Insights:

    • Hypothyroidism etiology may dictate the best approach for levothyroxine dose adjustments in pregnancy.

    Related Experiment Videos

  • Individualized management strategies are crucial for pregnant women with hypothyroidism.
  • Further research is needed to confirm the impact of etiology on dosage adjustments.

    • Outlook:

    • Future studies should focus on prospective trials to validate the role of etiology in levothyroxine management.
    • Developing evidence-based guidelines for dose adjustments based on hypothyroidism cause is a future goal.
    • Improved management can lead to better maternal and fetal outcomes in pregnancies complicated by hypothyroidism.