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Related Concept Videos

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 Drugs: β-Blockers01:22

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β-adrenergic antagonists, commonly known as β-blockers, block the effects of sympathetic neurotransmitters such as noradrenaline (NA) and adrenaline (ADR). They have several beneficial effects in heart failure treatment. They reduce heart rate, the force of contraction, and cardiac muscle relaxation. They also slow the atrial-ventricular conduction rate and raise the threshold for arrhythmias. The concentration of β-blockers determines their effects on bronchodilation,...
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Heart Failure Drugs: Inotropic Agents01:26

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Positive inotropic agents are commonly used as the first line of treatment for heart failure. One such agent is digoxin, derived from the genus Digitalis, which has been known for centuries but effectively utilized since 1785. However, these cardiac glycosides can have potentially toxic effects due to their mechanism of action, which involves inhibiting Na+/K+-ATPase and increasing contractility. Digoxin is absorbed orally and distributed in various tissues, including the CNS. It has a long...
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Pathophysiology of Heart Failure01:17

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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 Drugs: Diuretics01:22

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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 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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Implantation of an Isoproterenol Mini-Pump to Induce Heart Failure in Mice
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Thyroid hormones and heart failure.

Felipe Martinez1

  • 1DAMIC/Fundación Rusculleda, Cordoba National University, Av. Colon 2057, Córdoba, 5000, Argentina. dr.martinez@usa.net.

Heart Failure Reviews
|April 22, 2016
PubMed
Summary
This summary is machine-generated.

Thyroid dysfunction significantly impacts heart failure (HF) risk and outcomes. Both thyroid hormones and TSH levels are crucial for cardiac health, influencing diagnosis and treatment strategies.

Keywords:
Heart failureHormone replacementHyperthyroidismHypothyroidismThyroid hormones

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Area of Science:

  • Endocrinology and Cardiology
  • Investigates the intricate relationship between thyroid function and cardiovascular health.

Background:

  • Heart failure (HF) is a prevalent health issue with growing evidence linking it to thyroid dysfunction.
  • Thyroid hormones (TH), particularly T3, possess cardioprotective properties.
  • Thyroid disorders can precipitate cardiac dysfunction, and conversely, cardiac issues can lead to thyroid dysregulation.

Purpose of the Study:

  • To explore the bidirectional relationship between thyroid dysfunction and heart failure.
  • To highlight the clinical implications of thyroid hormone levels and TSH in HF management.
  • To emphasize the role of thyroid status in predicting HF outcomes.

Main Methods:

  • Review of recent studies investigating thyroid dysfunction in heart failure patients.
  • Analysis of the impact of altered thyroid hormone levels on cardiac function.
  • Examination of TSH as a predictor of clinical outcomes in HF.

Main Results:

  • Increased plasma TH can lead to negative neurohormonal activation impacting cardiac function.
  • Hypothyroidism is associated with altered myocardial and vascular remodeling, contributing to cardiac failure.
  • Low plasma TSH levels are identified as an independent risk factor for HF development and adverse clinical outcomes, including mortality and hospitalizations.

Conclusions:

  • Thyroid dysfunction plays a significant role in the pathophysiology and prognosis of heart failure.
  • Physicians must consider thyroid status for accurate diagnosis and effective treatment of HF patients.
  • TSH levels are important predictors of clinical outcomes in heart failure.