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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...
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...
Drug Dosing: Geriatric Patients01:15

Drug Dosing: Geriatric Patients

Elderly individuals encompass a diverse population with varying degrees of age-related physiological changes. Defining the elderly presents challenges, as the geriatric population is often arbitrarily categorized as individuals older than 65. However, many individuals in this group lead active and healthy lives, with an increasing number surpassing 85 years and falling into the older elderly category. Physiological changes associated with aging impact performance capacity and homeostatic...
Graves' Disease I: Introduction01:28

Graves' Disease I: Introduction

Graves' disease is an autoimmune disorder that causes hyperthyroidism, or overactivity of the thyroid gland. It results from autoantibodies called thyroid-stimulating immunoglobulins (TSIs), which bind to thyroid-stimulating hormone (TSH) receptors, leading to overstimulation of hormone production and a hypermetabolic state.EtiologyAlthough considered idiopathic, Graves’ disease has well-established contributing factors. There is a strong genetic component, with increased prevalence in...

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Related Experiment Videos

Functional central hypothyroidism in the elderly.

Maren A Sell1, Matthias Schott, Lutz Tharandt

  • 1Department of Endocrinology, Diabetes and Rheumatology, University Hospital Duesseldorf, D-40225 Duesseldorf, Germany.

Aging Clinical and Experimental Research
|July 3, 2008
PubMed
Summary
This summary is machine-generated.

Thyroid-stimulating hormone (TSH) response to thyrotropin-releasing hormone (TRH) declines with age, particularly in men. This suggests aging may impair pituitary function, contributing to lower thyroid hormone levels in older adults.

Related Experiment Videos

Area of Science:

  • Endocrinology
  • Gerontology
  • Thyroid Research

Background:

  • Adults experience declining blood concentrations of free thyroxine and basal thyroid-stimulating hormone (TSH).
  • Potential mechanisms include reduced thyroid activity, impaired peripheral 5'-deiodinase, and increased reverse 3,5,3'-triiodothyronine.
  • Pituitary reserve testing in aging has yielded inconsistent results.

Purpose of the Study:

  • To investigate the preservation of the TSH response to TRH during aging.
  • To evaluate potential age-related changes in pituitary function concerning thyroid hormone regulation.

Main Methods:

  • A cohort of 387 individuals aged 13-100 years was studied.
  • Thyroid disease was excluded through normal thyroid ultrasound, free thyroxine, free triiodothyronine, TSH levels, and negative thyroid peroxidase antibodies.
  • The TSH response to TRH was assessed in all participants.

Main Results:

  • Serum free thyroxine levels remained stable with age.
  • Free triiodothyronine and TSH levels were lower in older subjects.
  • The TSH response to TRH was blunted in older individuals, especially males.

Conclusions:

  • Decreased thyroid hormone levels in aging are likely due to lower TSH concentrations.
  • Lower TSH concentrations in older adults may indicate impaired pituitary activity.
  • The study provides evidence for age-related changes in the hypothalamic-pituitary-thyroid axis.