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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...
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...
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 Video

Updated: May 25, 2026

Telomere Length and Telomerase Activity; A Yin and Yang of Cell Senescence
12:08

Telomere Length and Telomerase Activity; A Yin and Yang of Cell Senescence

Published on: May 22, 2013

Thyroid function and mortality in older men: a prospective study.

Avantika C Waring1, Stephanie Harrison, Mary H Samuels

  • 1Department of Medicine, University of California, San Francisco, 400 Parnassus Avenue, A-550, San Francisco, California 94143, USA. avantika.waring@ucsf.edu

The Journal of Clinical Endocrinology and Metabolism
|January 13, 2012
PubMed
Summary
This summary is machine-generated.

Thyroid function in older men did not predict mortality. Subclinical thyroid dysfunction showed no association with increased all-cause or cardiovascular death risk in this cohort.

Related Experiment Videos

Last Updated: May 25, 2026

Telomere Length and Telomerase Activity; A Yin and Yang of Cell Senescence
12:08

Telomere Length and Telomerase Activity; A Yin and Yang of Cell Senescence

Published on: May 22, 2013

Area of Science:

  • Endocrinology
  • Gerontology
  • Epidemiology

Background:

  • Thyroid function abnormalities are linked to varied mortality outcomes.
  • Understanding these associations in older populations is crucial for health management.

Purpose of the Study:

  • To investigate the relationship between thyroid-stimulating hormone (TSH) levels and thyroid function categories with mortality in elderly men.
  • To determine if subclinical thyroid dysfunction impacts total, cardiovascular, or cancer mortality.

Main Methods:

  • Analysis of data from the Osteoporotic Fractures in Men (MrOS) study, including 1587 men aged 65+.
  • Measurement of baseline TSH and free T4, categorizing thyroid function (euthyroid, subclinical hyperthyroid, subclinical hypothyroid).
  • Tracking of total, cardiovascular, and cancer deaths over an average follow-up of 8.3 years.

Main Results:

  • No significant association was found between continuous TSH levels and total, cardiovascular, or cancer mortality.
  • Thyroid function categories did not show a statistically significant link to cause-specific or total mortality.
  • A small number of participants had severe subclinical hypothyroidism (TSH ≥10 mIU/liter).

Conclusions:

  • A single thyroid function test does not predict mortality in older men.
  • Subclinical thyroid dysfunction is not associated with increased all-cause or cardiovascular mortality in this demographic.
  • Findings suggest neither a beneficial nor detrimental effect of subclinical thyroid dysfunction in elderly men.