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Functions of Thyroid Hormones01:18

Functions of Thyroid Hormones

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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...
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Synthesis and Regulation of Thyroid Hormones01:20

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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...
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Factors Influencing Heart Rate01:30

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The heart rate, or pulse rate, is a vital indicator of cardiovascular health. It reflects the number of times the heart beats per minute. Various physiological and environmental factors influence heart rate, increasing or decreasing cardiac output. Understanding these factors is crucial for assessing heart function and identifying potential health issues.
Let us explore the significant factors affecting heart rate, including age, body temperature, posture, acute pain, chemical influences,...
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Cardiovascular Drugs: Classification based on Therapeutic Indications01:18

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Cardiovascular diseases, encompassing a range of conditions, can significantly affect the heart's operations and the overall circulatory system. These conditions impair the heart's ability to pump blood, leading to a deficit in oxygen supply to crucial organs. Anomalies in the heart's electrical system, known as arrhythmias, can cause heartbeats to accelerate or slow down. Usually, heart rates increase during physical activity and decrease while resting or sleeping. However,...
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Exercise and Cardiovascular Response01:20

Exercise and Cardiovascular Response

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Exercise significantly impacts cardiovascular response, which is crucial for understanding patient health and designing effective treatment plans.
Light to moderate physical activity initiates a series of interconnected responses in the body. The heart rate modestly increases in anticipation of the workout, followed by widespread vasodilation as oxygen consumption by skeletal muscles increases. This results in decreased peripheral resistance, increased capillary blood flow, and accelerated...
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Pathophysiology of Cardiac Performance01:29

Pathophysiology of Cardiac Performance

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Typical heart performance is influenced by heart rate, rhythm, myocardial contraction, and metabolism or blood flow. The cardiac muscle exhibits distinct electrophysiological features, including pacemaker activity and calcium channel control, which play a vital role in the heart's response to various drugs. The autonomic nervous system, comprising the sympathetic and parasympathetic branches, regulates heart rate. Sympathetic activation increases heart rate, while parasympathetic activation...
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Related Experiment Video

Updated: Mar 13, 2026

Author Spotlight: In Vivo Assessment of Thyroid Hormone Disruption Using the THAI Mouse Model
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Author Spotlight: In Vivo Assessment of Thyroid Hormone Disruption Using the THAI Mouse Model

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[Thyroid hormones and cardiovascular system].

Zdeňka Límanová, Jan Jiskra

    Vnitrni Lekarstvi
    |October 14, 2016
    PubMed
    Summary
    This summary is machine-generated.

    Thyroid dysfunction impacts cardiovascular risk, with subclinical hyperthyroidism posing a greater threat than hypothyroidism. Amiodarone-induced thyroid issues require specific treatment based on type to manage cardiovascular complications effectively.

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    Area of Science:

    • Endocrinology
    • Cardiology
    • Internal Medicine

    Background:

    • Thyroid hormones significantly influence the cardiovascular system through genomic and non-genomic pathways.
    • Overt thyroid dysfunction elevates cardiovascular risk, while subclinical forms present more complex associations.
    • Subclinical hyperthyroidism is linked to higher cardiovascular risk compared to subclinical hypothyroidism, except in the elderly (>85 years) where subclinical hypothyroidism may correlate with lower mortality.

    Purpose of the Study:

    • To review the cardiovascular implications of thyroid dysfunction, including subclinical states and amiodarone-induced thyroid dysfunction.
    • To delineate treatment strategies for different types of amiodarone-induced thyroid dysfunction, differentiating between Type 1 and Type 2 hyperthyroidism.
    • To provide guidance on managing subclinical thyroid dysfunction in various age groups.

    Main Methods:

    • Literature review and meta-analysis interpretation focusing on thyroid dysfunction and cardiovascular outcomes.
    • Analysis of clinical data and treatment responses for amiodarone-induced thyroid dysfunction.
    • Synthesis of current knowledge on the management of subclinical hyperthyroidism and hypothyroidism.

    Main Results:

    • Subclinical hyperthyroidism is associated with increased cardiovascular risk, whereas subclinical hypothyroidism shows varied associations, including reduced mortality in the very elderly.
    • Type 1 amiodarone-induced hyperthyroidism necessitates methimazole treatment, potential thyroidectomy, or radioiodine ablation, with cautious amiodarone discontinuation.
    • Type 2 amiodarone-induced hyperthyroidism responds promptly to glucocorticoids, and amiodarone may be stopped earlier if not life-saving.

    Conclusions:

    • Treatment decisions for subclinical thyroid dysfunction should consider age, with a preference for treating subclinical hyperthyroidism in the elderly and subclinical hypothyroidism in younger individuals.
    • Accurate differentiation between Type 1 and Type 2 amiodarone-induced hyperthyroidism is crucial for effective management.
    • Amiodarone-induced hypothyroidism is managed with levothyroxine without necessarily interrupting amiodarone therapy.