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Pathophysiology of Cardiac Performance

Pathophysiology of Cardiac Performance

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...

Heart Failure Drugs: Inhibitors of Renin-Angiotensin System

Heart Failure Drugs: Inhibitors of Renin-Angiotensin System

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...

Regulation of Heart Rates

Regulation of Heart Rates

The regulation of heart rate is a complex process controlled by the autonomic nervous system (ANS), hormonal influences, and intrinsic cardiac mechanisms. The ANS has two main components: the sympathetic nervous system (SNS) and the parasympathetic nervous system (PNS).
The SNS increases heart rate through the release of norepinephrine and epinephrine, which act on beta-1 adrenergic receptors in the heart. This action increases the rate of depolarization in the sinoatrial (SA) node, the heart's...

Electrophysiology of Normal Cardiac Rhythm

Electrophysiology of Normal Cardiac Rhythm

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...

Mechanism of Cardiac Arrhythmias

Mechanism of Cardiac Arrhythmias

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.

Heart Failure Drugs: Inotropic Agents

Heart Failure Drugs: Inotropic Agents

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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Impact of Intracardiac Neurons on Cardiac Electrophysiology and Arrhythmogenesis in an Ex Vivo Langendorff System

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Cardiac Neuromodulation and Neurocardiology.

Robert Lemery^1,2

¹Cardiology, Electrophysiology and Medical History, Montreal, QC, Canada.

Journal of Cardiovascular Electrophysiology

|February 20, 2025

Summary

This summary is machine-generated.

Neurocardiology advances offer novel neuromodulation therapies for heart conditions. Targeting the cardiac autonomic nervous system can treat arrhythmias, heart failure, and hypertension.

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Area of Science:

Neurocardiology
Cardiac Autonomic Nervous System
Neuromodulation Therapies

Background:

Neurocardiology, historically led by anatomy and physiology, has evolved with a deeper understanding of the cardiac autonomic nervous system.
Established neuromodulation techniques like sympathectomy and spinal cord stimulation have been used for decades.
Contemporary research and advanced imaging/ablation techniques are driving new neuromodulation strategies.

Purpose of the Study:

To explore the evolving landscape of neurocardiology and its therapeutic implications.
To highlight the potential of novel neuromodulation techniques in managing cardiac conditions.
To discuss the application of autonomic tone modulation for various cardiovascular diseases.

Main Methods:

Review of existing literature on neurocardiology and neuromodulation.
Discussion of established and emerging techniques such as stellate ganglionic block, epidural anesthesia, cardiac sympathetic denervation, and renal sympathetic denervation.
Exploration of cardiac mapping for ablation-guided neuromodulation.

Main Results:

Neuromodulation offers potential benefits for patients with structural heart disease, malignant ventricular arrhythmias, and symptomatic ventricular ectopy by reducing autonomic tone.
Renal sympathetic denervation shows promise in treating hypertension and reducing atrial and ventricular arrhythmias.
Potentiating parasympathetic tone may improve clinical outcomes in heart failure patients.

Conclusions:

Advanced neurocardiology and neuromodulation techniques represent a significant frontier in treating complex cardiac conditions.
Targeted autonomic nervous system modulation, including sympathetic and parasympathetic interventions, holds promise for diverse cardiovascular diseases.
Future research and clinical application of these techniques could revolutionize cardiology and cardiac electrophysiology.