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Related Concept Videos

Heart Failure II: Pathophysiology01:29

Heart Failure II: Pathophysiology

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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...
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Pathophysiology of Heart Failure01:17

Pathophysiology of Heart Failure

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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...
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Heart Failure I: Introduction01:27

Heart Failure I: Introduction

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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...
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Heart Failure VI: Adjunct Therapies01:22

Heart Failure VI: Adjunct Therapies

336
Additional therapies for treating patients with heart failure (HF) may include procedural interventions, supplemental oxygen, the management of sleep disorders, and nutritional therapy.Procedural InterventionsImplantable Cardioverter-Defibrillator: For patients at risk of life-threatening arrhythmias due to severe left ventricular dysfunction, an Implantable Cardioverter-Defibrillator (ICD) can detect and terminate these arrhythmias, preventing sudden cardiac death and improving survival rates.
336
Heart Failure Drugs: Diuretics01:22

Heart Failure Drugs: Diuretics

966
Heart failure and kidney perfusion are interconnected in a complex way. Reduced renal perfusion and venous congestion are two significant factors that contribute to renal dysfunction in heart failure. The kidneys, primarily responsible for fluid balance in the body, are adversely affected due to compromised cardiac output and increased venous pressure. In response to reduced renal perfusion, the kidneys activate neurohumoral mechanisms to restore balance. However, these mechanisms can be...
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Heart Failure V: Medical Management01:30

Heart Failure V: Medical Management

312
Medical Management of Acute Decompensated Heart Failure (ADHF)The primary goals of therapy for patients hospitalized with acute decompensated heart failure (ADHF) include:Relieving symptomsOptimizing volume statusSupporting oxygenation and ventilationMaintaining cardiac output (CO) and end-organ perfusionIdentifying and addressing the cause of ADHFPreventing complicationsProviding patient education on factors precipitating HF exacerbationPlanning for dischargeOngoing monitoring and assessment...
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Related Experiment Video

Updated: Jan 31, 2026

A Rat Model of Pressure Overload Induced Moderate Remodeling and Systolic Dysfunction as Opposed to Overt Systolic Heart Failure
07:13

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Thyroid Dysfunction in Heart Failure and Cardiovascular Outcomes.

Lakshmi Kannan1, Pamela A Shaw2, Michael P Morley3

  • 1Division of Endocrinology, Diabetes, and Metabolism (L.K., A.R.C.) at the Perelman School of Medicine at the University of Pennsylvania, Philadelphia.

Circulation. Heart Failure
|December 19, 2018
PubMed
Summary
This summary is machine-generated.

Thyroid dysfunction, specifically subclinical hypothyroidism and low T3 levels, is linked to worse outcomes in heart failure patients. Further research into thyroid hormone therapy for heart failure is warranted.

Keywords:
atrial fibrillationeuthyroid sick syndromesheart failureheart transplantationhypothyroidismthyroid diseases

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Area of Science:

  • Cardiology
  • Endocrinology
  • Internal Medicine

Background:

  • Thyroid dysfunction effects in heart failure patients are understudied.
  • This study investigates thyroid dysfunction prevalence and cardiovascular outcomes in heart failure patients.

Purpose of the Study:

  • To examine the association between thyroid dysfunction and heart failure severity.
  • To determine the link between thyroid dysfunction and adverse cardiovascular events in heart failure patients.

Main Methods:

  • A prospective cohort study of 1365 heart failure outpatients (Penn Heart Failure Study).
  • Analysis of thyroid-stimulating hormone (TSH), free thyroxine (FT4), and total triiodothyronine (TT3) levels.
  • Assessment of associations with New York Heart Association class, atrial fibrillation, and a composite endpoint (device placement, transplant, or death).

Main Results:

  • More severe heart failure correlated with higher TSH, higher FT4, and lower TT3.
  • Atrial fibrillation was associated with elevated FT4 levels.
  • Subclinical hypothyroidism (TSH ≥7 mIU/L) and isolated low T3 were linked to increased risk of the composite endpoint.

Conclusions:

  • Subclinical hypothyroidism (TSH ≥7 mIU/L) and isolated low T3 levels indicate a poor prognosis in heart failure patients.
  • Clinical trials are recommended to evaluate the efficacy of T4 and T3 therapy in heart failure management.