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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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Mechanism of Cardiac Arrhythmias01:28

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Arrhythmias are irregular heart rhythms occurring when the heart's electrical impulses become abnormal. These disturbances can lead to various symptoms, depending on their severity and the underlying cause. Some common factors contributing to arrhythmias include hypoxia, ischemia, electrolyte imbalances, excessive catecholamine exposure, drug toxicity, and muscle overstretching. Arrhythmias can be classified into two main types based on the rate and site of origin of abnormal heart rhythms.
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Pathophysiology of Cardiac Performance01:29

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Typical heart performance is influenced by heart rate, rhythm, myocardial contraction, and metabolism or blood flow. The cardiac muscle exhibits distinct electrophysiological features, including pacemaker activity and calcium channel control, which play a vital role in the heart's response to various drugs. The autonomic nervous system, comprising the sympathetic and parasympathetic branches, regulates heart rate. Sympathetic activation increases heart rate, while parasympathetic activation...
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The normal cardiac rhythm is a synchronized electrical activity that facilitates the regular and coordinated contraction of the heart muscle. This process is essential for efficient blood circulation throughout the body. The fundamental elements involved in establishing and maintaining this rhythm include the unique electrical properties of cardiac muscle cells, the sinoatrial (SA) node's pacemaker function, the specialized conducting system, and the ionic mechanisms underlying each phase...
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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 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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Functional-Molecular Mechanisms of Sympathetic-Parasympathetic Dysfunction in PVC-Induced Cardiomyopathy Revealed by

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Autonomic dysfunction, specifically sympathetic overload and parasympathetic impairment, is evident in premature ventricular contraction-induced cardiomyopathy (PVC-CM). Reduced cardiac neurotrophic factor may contribute to this dysfunction, suggesting neuromodulation as a potential therapy.

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Area of Science:

  • Cardiology
  • Autonomic Neuroscience
  • Molecular Biology

Background:

  • The role of autonomic dysfunction in premature ventricular contraction-induced cardiomyopathy (PVC-CM) is not well understood.
  • Premature ventricular contractions (PVCs) can lead to cardiomyopathy, but the underlying autonomic mechanisms require further investigation.

Purpose of the Study:

  • To investigate the functional and molecular mechanisms of cardiac autonomic nervous system remodeling in a PVC-CM animal model.
  • To characterize autonomic responses using a novel dual stressor challenge combining exercise and PVCs.

Main Methods:

  • Induction of PVC-CM in canines over 12 weeks via bigeminal PVCs.
  • Continuous recording of sympathetic nerve activity (SNA), vagal nerve activity (VNA), and heart rate during treadmill exercise with and without PVCs.
  • Molecular analysis of neural remodeling markers using Western blot and ELISA.

Main Results:

  • Exercise amplified SNA and blunted VNA withdrawal in the presence of PVCs.
  • PVC-CM development resulted in resting sympathetic hyperactivity, impaired exercise-induced SNA augmentation, and blunted VNA and heart rate recovery.
  • Cardiac autonomic remodeling showed sympathetic hyperinnervation and elevated norepinephrine, but unchanged parasympathetic innervation, alongside downregulated cardiac nerve growth factor.

Conclusions:

  • Combined exercise and PVC challenge reveals sympathetic overload and parasympathetic dysfunction in PVC-CM.
  • Downregulation of cardiac neurotrophic factor may be a key mechanism underlying autonomic dysfunction in PVC-CM.
  • Neuromodulation therapies targeting autonomic function represent a potential therapeutic strategy for PVC-CM.