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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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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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The activation of the sympathetic nervous system and the renin-angiotensin-aldosterone system (RAAS) contributes to cardiac remodeling, and inhibiting the RAAS is a pharmacological target in heart failure management. As a result, neurohumoral modulation is a crucial treatment principle for managing heart failure. This approach involves using medications like ACE inhibitors (ACEIs), angiotensin receptor blockers (ARBs), β-blockers, mineralocorticoid receptor antagonists (MRAs), and neutral...
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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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Dissecting the exercise pressor reflex in heart failure: A multi-step failure.

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The exercise pressor reflex (EPR), initiated by exercising muscles, is abnormal in heart failure. This dysfunction exaggerates sympathetic nervous system activity, impairing exercise response and limiting function in patients.

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Area of Science:

  • Cardiovascular Physiology
  • Neuroscience
  • Exercise Physiology

Background:

  • Neural feedback from exercising muscles influences cardiovascular responses.
  • The exercise pressor reflex (EPR) involves group III and IV sensory neurons in skeletal muscle.
  • EPR optimizes hemodynamics by modulating autonomic nervous system activity.

Purpose of the Study:

  • Review the determinants of EPR control in healthy individuals.
  • Examine the impact of heart failure on EPR components and function.
  • Discuss how heart failure affects intramuscular stimuli and end-organ responsiveness.

Main Methods:

  • Literature review of animal and human studies.
  • Analysis of data on group III/IV muscle afferent sensitivity.
  • Examination of central nervous system processing of sensory feedback.

Main Results:

  • EPR is abnormal in heart failure, leading to exaggerated sympatho-excitation.
  • Heart failure impairs afferent signal transmission and central integration of EPR.
  • Heart failure affects exercise-induced intramuscular stimuli and sympathetic responsiveness.

Conclusions:

  • Abnormal EPR contributes to exercise intolerance in heart failure.
  • Understanding EPR dysfunction is crucial for managing heart failure patients.
  • Further research is needed on heart failure with preserved ejection fraction (HFpEF) and EPR.