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Related Concept Videos

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...
Heart Failure I: Introduction01:27

Heart Failure I: Introduction

Heart failure refers to a clinical syndrome caused by structural or functional cardiac disorders that prevent the heart from pumping an adequate amount of blood to meet the body's metabolic needs. This condition often arises from myocardial infarction or ischemia, leading to decreased cardiac output, reduced tissue perfusion, impaired gas exchange, fluid volume imbalance, and decreased functional ability.Heart failure can result from disruptions in the mechanisms that regulate cardiac output...
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...
Pathophysiology of Heart Failure01:17

Pathophysiology of Heart Failure

Heart failure (HF) is a progressive syndrome involving ventricles that leads to inadequate cardiac output. It can be classified based on location and output or ejection fraction. Ejection fraction (EF) is an essential measurement in the diagnosis and surveillance of HF. Reduced EF corresponds to systolic heart failure (HFrEF). However, HF with preserved ejection fraction (HFpEF) is becoming increasingly prevalent. Also known as diastolic HF, this form of HF is related to aging. The...
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...
Heart Failure III: Clinical Manifestations01:26

Heart Failure III: Clinical Manifestations

Heart failure (HF) manifests primarily as dyspnea, fatigue, and fluid retention, resulting in peripheral and pulmonary edema. Symptoms may vary depending on which ventricle is more affected, left or right.Left-Sided Heart FailureAlso known as left ventricular failure, this condition results from the left ventricle's inability to fill or eject sufficient blood into the systemic circulation. It leads to pulmonary congestion, which occurs when the left ventricle fails to eject blood effectively...

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Related Experiment Video

Updated: Jun 3, 2026

Murine Echocardiography of Left Atrium, Aorta, and Pulmonary Artery
08:17

Murine Echocardiography of Left Atrium, Aorta, and Pulmonary Artery

Published on: February 20, 2017

Hyperthyroidism-induced left ventricular diastolic dysfunction: implication in hyperthyroidism-related heart failure.

Wen-Sheng Yue1, Boon-Hor Chong, Xue-Hua Zhang

  • 1Cardiology Division, Department of Medicine, Queen Mary Hospital, The University of Hong Kong, Hong Kong, China.

Clinical Endocrinology
|April 8, 2011
PubMed
Summary
This summary is machine-generated.

Hyperthyroidism can cause diastolic dysfunction, especially in older individuals. This dysfunction is often reversible once thyroid levels normalize, highlighting the importance of managing hyperthyroidism.

Related Experiment Videos

Last Updated: Jun 3, 2026

Murine Echocardiography of Left Atrium, Aorta, and Pulmonary Artery
08:17

Murine Echocardiography of Left Atrium, Aorta, and Pulmonary Artery

Published on: February 20, 2017

Area of Science:

  • Cardiology
  • Endocrinology
  • Internal Medicine

Background:

  • Heart failure affects 6% of hyperthyroid patients, with only half exhibiting impaired left ventricular (LV) systolic function.
  • This suggests diastolic dysfunction plays a significant role in hyperthyroidism-related heart failure pathogenesis.

Purpose of the Study:

  • To assess diastolic function in hyperthyroid patients using echocardiography.
  • To determine the reversibility of diastolic dysfunction after achieving a euthyroid state.
  • To investigate age-related differences in cardiovascular response to hyperthyroidism.

Main Methods:

  • Serial echocardiographic examinations were performed on 70 hyperthyroid patients.
  • Diastolic function was assessed before and 6 months after achieving a euthyroid state.
  • Statistical analysis identified predictors of diastolic dysfunction and cardiovascular changes.

Main Results:

  • Diastolic dysfunction was detected in 22% of patients, with prevalence increasing significantly with age.
  • Age was the sole independent predictor of diastolic dysfunction.
  • Following treatment, 72% of patients normalized diastolic function, with younger patients showing complete recovery.

Conclusions:

  • Hyperthyroidism is linked to diastolic dysfunction, particularly in older patients.
  • Diastolic dysfunction in hyperthyroidism is partly reversible upon achieving a euthyroid state.
  • Age significantly influences cardiovascular adaptation to hyperthyroidism, impacting diastolic function.