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Pathophysiology of Cardiac Performance01:29

Pathophysiology of Cardiac Performance

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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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Adrenergic stimulation generally impacts cardiac rate and rhythm. Specifically, stimulation of the β-adrenoceptors triggers an increase in intracellular calcium ion influx and pacemaker currents, which may cause arrhythmias. Catecholamines like adrenaline also demonstrate β2-adrenoceptor-mediated hypokalemia, impacting cardiac action potential and disrupting the normal cardiac rhythm. Class II antiarrhythmic drugs are β-adrenoceptor antagonists or β-blockers, which...
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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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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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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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Modulating Perioperative Ventricular Excitability.

Kimberly Howard-Quijano1, Yuki Kuwabara1

  • 1Department of Anesthesiology and Perioperative Medicine, University of Pittsburgh School of Medicine, Biomedical Science Tower, Pittsburgh, PA, USA.

Anesthesiology Clinics
|May 10, 2025
PubMed
Summary
This summary is machine-generated.

Cardiac arrhythmias increase patient risk. Autonomic nervous system imbalances heighten myocardial excitability, contributing to ventricular tachyarrhythmias, which can be managed perioperatively.

Keywords:
Autonomic nervous systemMyocardial excitabilityPerioperativeSpinal cord stimulationStellate ganglion blockThoracic epidural anesthesiaVagus nerve stimulationVentricular arrhythmias

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Area of Science:

  • Cardiology
  • Anesthesiology
  • Physiology

Background:

  • Cardiac arrhythmias contribute significantly to patient morbidity and mortality.
  • Ventricular arrhythmogenesis results from complex interactions between substrate, electrophysiology, and triggers.
  • Autonomic nervous system imbalances increase myocardial excitability, a key factor in ventricular tachyarrhythmias.

Purpose of the Study:

  • To explore the modulation of myocardial excitability and ventricular arrhythmogenesis in the perioperative setting.
  • To understand the role of autonomic nervous system imbalances in cardiac arrhythmias.

Main Methods:

  • Review of existing literature on cardiac electrophysiology and perioperative management.
  • Analysis of factors influencing myocardial excitability and arrhythmogenesis.
  • Examination of anesthetic and surgical techniques impacting cardiac function.

Main Results:

  • Perioperative management strategies can modulate myocardial excitability.
  • Hemodynamic and physiologic control influences ventricular arrhythmogenesis.
  • Anesthetic agents and regional techniques impact cardiac electrophysiology.

Conclusions:

  • Perioperative interventions offer a means to manage myocardial excitability and ventricular arrhythmogenesis.
  • Understanding these modulations is crucial for reducing cardiac morbidity and mortality.
  • Targeting autonomic nervous system imbalances may prevent perioperative arrhythmias.