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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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The regulation of stroke volume, which is the amount of blood the heart pumps out during each heartbeat, is critical for maintaining a healthy circulatory system. Stroke volume is influenced by three main factors: preload, contractility, and afterload.
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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.
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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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Related Experiment Video

Updated: Nov 9, 2025

Continuous Venous-Arterial Doppler Ultrasound During a Preload Challenge
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Left ventricular myocardial function in hemodialysis patients: the effects of preload decrease in conventional,

Salma Charfeddine1, Leila Abid1, Rania Hammami1

  • 1Department of Cardiology, Hedi Chaker University Hospital, Sfax, Tunisia.

The Pan African Medical Journal
|April 15, 2021
PubMed
Summary

Speckle tracking imaging (STI) reveals subclinical left ventricular (LV) dysfunction in hemodialysis (HD) patients with preserved ejection fraction. A single HD session improved global strain values, indicating potential for early detection of LV dysfunction.

Keywords:
Hemodialysisechocardiographyleft ventricular functionspeckle tracking imagingstrain

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Area of Science:

  • Cardiology
  • Nephrology
  • Medical Imaging

Background:

  • Hemodialysis (HD) patients with preserved left ventricular ejection fraction (LVEF) may have subclinical myocardial dysfunction.
  • Conventional echocardiography and Doppler may not fully capture these subtle changes.

Purpose of the Study:

  • To assess left ventricular (LV) myocardial function in HD patients using conventional echocardiography, pulsed Doppler, and speckle tracking imaging (STI).
  • To evaluate the impact of a single HD session on LV systolic and diastolic functions.

Main Methods:

  • 30 chronic HD patients underwent echocardiography and Doppler studies before and after HD.
  • Two- and three-dimensional STI measured LV global longitudinal, circumferential, and radial strains.

Main Results:

  • HD led to significant decreases in LV dimensions, left atrium (LA) area, pulmonary artery pressure, and inferior vena cava diameter.
  • Mitral inflow velocities and E/E' ratio decreased post-HD, alongside reductions in LV/LA volumes and LV mass index.
  • While 3D-LVEF remained preserved, 2D and 3D strain rates decreased, yet global strain values improved post-HD.
  • Inverse correlations were observed between LV mass index, serum BNP, and LV global longitudinal strain.

Conclusions:

  • STI analysis provides valuable insights into subclinical LV dysfunction in HD patients with preserved LVEF.
  • STI may aid in the early detection and management of cardiac complications in this population.