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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...
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...
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...
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...
Alzheimer Disease l: Introduction01:29

Alzheimer Disease l: Introduction

Alzheimer disease is a chronic, progressive, and irreversible neurodegenerative disorder and the most common cause of dementia in older adults. It leads to gradual neuronal loss, causing cognitive decline, behavioral changes, and loss of functional independence.Risk Factors and EtiologyThe disease is multifactorial. Age is the strongest risk factor, with prevalence doubling every 5 years after age 65. Genetic factors include mutations in genes such as APP, PSEN1, and PSEN2, which are associated...
Dementia l: Introduction01:22

Dementia l: Introduction

Dementia is an acquired, progressive syndrome characterized by a decline in multiple cognitive domains severe enough to impair daily functioning and reduce independence. Although memory loss is a central feature, the diagnosis requires additional deficits involving language, executive function, visuospatial skills, judgment, calculation, or abstract reasoning. These cognitive impairments reflect underlying neurodegenerative or vascular processes that gradually disrupt neuronal networks...

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Advancements and Insights in Thyroid Health.

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Real-World and RCT Evidence Converge: GLP-1RAs and Pancreatic Safety.

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Etomidate in Severe Cushing Syndrome: An Underutilized Bridge in Endocrine Emergency Care.

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Early Metabolic Risk in Childhood Brain Cancer Survivors with Childhood-Onset Growth Hormone Deficiency.

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相关实验视频

Updated: Jul 9, 2026

Quantifying Cognitive Decrements Caused by Cranial Radiotherapy
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甲状腺功能和认知衰退:叙述性审查

Sophia Hemmrich Sinha1, Kahli Zietlow2, Maria Papaleontiou3

  • 1Division of Metabolism, Endocrinology and Diabetes, Department of Internal Medicine, University of Michigan, Ann Arbor, Michigan.

Endocrine practice : official journal of the American College of Endocrinology and the American Association of Clinical Endocrinologists
|August 7, 2024
PubMed
概括
此摘要是机器生成的。

老年人甲状腺功能与认知衰退或痴呆症没有明确的联系. 需要更多的研究来了解潜在的关联以及治疗甲状腺功能障碍对认知的影响.

关键词:
认知 认知 认知痴呆症 痴呆症是一种痴呆症.年龄较大的成年人.甲状腺激素是甲状腺激素的一种.

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相关实验视频

Last Updated: Jul 9, 2026

Quantifying Cognitive Decrements Caused by Cranial Radiotherapy
10:10

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Transcranial Direct Current Stimulation tDCS for Memory Enhancement

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Author Spotlight: Accurately Assessing Thyroid Hormone-Driven Motor Alterations in Mouse
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科学领域:

  • 老年学是一门学科.
  • 内分泌学 在内分泌学.
  • 神经科学是一个神经科学.

背景情况:

  • 认知衰退和痴呆症是美国老龄化人口的重大问题.
  • 识别可修改的风险因素对于公共卫生至关重要.
  • 甲状腺功能是老年人认知健康的潜在,但尚不清楚的贡献者.

研究的目的:

  • 审查现有的关于甲状腺功能 (甲状腺功能范围,甲状腺功能低下,甲状腺功能过高) 与老年人认知结果之间的关联的文献.

主要方法:

  • 在PubMed和Ovid/Medline.上进行了全面的文献搜索.
  • 包括2000年1月至2023年12月以英语出版的研究.
  • 研究类型包括随机对照试验,系统审查,元分析和观察性研究.

主要成果:

  • 关于甲状腺功能与认知结果/痴呆症之间的关系存在相互矛盾的结果.
  • 在参考范围内的较高甲状腺刺激激素 (TSH) 可能与痴呆的风险较低相关,在女性中可能更高.
  • 低TSH和长期的甲状腺功能障碍可能与痴呆风险增加有关,而甲状腺功能障碍的证据是不一致的.

结论:

  • 没有确的证据支持甲状腺功能障碍或甲状腺功能障碍和认知能力下降之间的直接联系.
  • 研究设计,测量和认知评估的异质性限制了当前的发现.
  • 未来的研究应该澄清潜在的关联和治疗甲状腺功能障碍对认知障碍的影响.