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Related Concept Videos

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...
Imbalances in Cardiac Output01:26

Imbalances in Cardiac Output

The heart's primary function is to pump blood throughout the body, maintaining a balance between blood sent out (cardiac output) and blood returning (venous return). If this balance is disrupted, it can result in congestive heart failure (CHF), a severe condition where the heart becomes an inefficient pump, leading to inadequate blood circulation.
CHF can occur due to the failure of either side of the heart. Left-side failure leads to pulmonary congestion—the right side continues to send blood...
Heart Failure II: Pathophysiology01:29

Heart Failure II: Pathophysiology

Systolic Heart Failure and Compensatory MechanismsSystolic heart failure (also termed HFrEF, Heart Failure with Reduced Ejection Fraction) is the most prevalent type of heart filure. It results in a decreased volume of blood being pumped from the ventricle. The aortic arch and carotid sinuses have baroreceptors that detect reduced blood pressure, triggering the sympathetic nervous system (SNS) to release epinephrine and norepinephrine. Initially, this response aims to boost heart rate and...
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...
Mitral Regurgitation I: Introduction01:20

Mitral Regurgitation I: Introduction

Mitral regurgitation is characterized by the backward circulation of blood from the left ventricle to the left atrium during systole, a phase of the cardiac cycle when the heart contracts and pumps blood out of the chambers. This abnormal flow occurs primarily due to the dysfunction of the mitral valve or its supporting structures, which include the mitral leaflets, chordae tendineae, annulus, and papillary muscles.Etiology and Mechanisms:Primary Mitral Regurgitation: This type arises from...
Mitral Stenosis I: Introduction01:22

Mitral Stenosis I: Introduction

Mitral Valve Stenosis (MVS) is a heart condition where the mitral valve narrows, impeding blood circulation from the left atrium to the left ventricle. The etiology and pathophysiology of this condition are multifaceted, leading to a cascade of cardiovascular complications.Causes of Mitral Valve StenosisRheumatic Heart Disease: It is the main cause of mitral valve stenosis, particularly in developing nations. This condition arises from rheumatic fever, an inflammatory illness resulting from...

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Related Experiment Video

Updated: May 13, 2026

In Vivo Quantitative Assessment of Myocardial Structure, Function, Perfusion and Viability Using Cardiac Micro-computed Tomography
08:13

In Vivo Quantitative Assessment of Myocardial Structure, Function, Perfusion and Viability Using Cardiac Micro-computed Tomography

Published on: February 16, 2016

Cardiac microvascular rarefaction in hyperthyroidism-induced left ventricle dysfunction.

Felipe Freitas1, Vanessa Estato, Vinícius Frias Carvalho

  • 1Laboratory of Cardiovascular Investigation, Oswaldo Cruz Institute, FIOCRUZ, Rio de Janeiro, Brazil.

Microcirculation (New York, N.Y. : 1994)
|March 21, 2013
PubMed
Summary
This summary is machine-generated.

Hyperthyroidism causes heart problems, including dysfunction and hypertrophy, by reducing capillaries in the heart. This microvascular rarefaction may contribute to cardiovascular changes in hyperthyroid rats.

Keywords:
cardiac fibrosisexperimental hyperthyroidismleft ventricular dysfunctionmyocardial microcirculation

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Last Updated: May 13, 2026

In Vivo Quantitative Assessment of Myocardial Structure, Function, Perfusion and Viability Using Cardiac Micro-computed Tomography
08:13

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Published on: February 16, 2016

Biventricular Assessment of Cardiac Function and Pressure-Volume Loops by Closed-Chest Catheterization in Mice
08:21

Biventricular Assessment of Cardiac Function and Pressure-Volume Loops by Closed-Chest Catheterization in Mice

Published on: June 15, 2020

Area of Science:

  • Cardiovascular Physiology
  • Endocrinology

Background:

  • Hyperthyroidism impacts cardiac function and neuroendocrine systems.
  • The role of hyperthyroidism in microcirculation changes is debated.
  • Understanding these effects is crucial for managing hyperthyroid heart conditions.

Purpose of the Study:

  • To investigate hyperthyroidism's effects on cardiac function in rats.
  • To examine hyperthyroidism's impact on cardiac microcirculation.
  • To analyze changes in the angiotensin II AT1 receptor in hyperthyroid hearts.

Main Methods:

  • Male Wistar rats were divided into euthyroid and hyperthyroid groups.
  • Hyperthyroidism was induced using l-thyroxine.
  • Echocardiography, histochemistry, and immunohistochemistry assessed cardiac function, capillary density, and receptor expression.

Main Results:

  • Hyperthyroidism induced systolic hypertension, tachycardia, left ventricle (LV) dysfunction, hypertrophy, and fibrosis.
  • Structural capillary rarefaction was observed in hyperthyroid rat myocardium.
  • Down-regulation of the cardiac angiotensin II AT1 receptor was noted.

Conclusions:

  • Microvascular rarefaction is implicated in hyperthyroidism-induced cardiovascular alterations.
  • These findings highlight the link between microcirculation and cardiac dysfunction in hyperthyroidism.