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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 of...

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.

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...

Sympathetic Signaling

Sympathetic Signaling

Sympathetic signaling, a vital part of the autonomic nervous system, plays a crucial role in mobilizing the body's resources in response to stress or emergencies. It involves the transmission of nerve impulses from sympathetic preganglionic fibers to postganglionic fibers. This results in the release of specific neurotransmitters and activation of adrenergic receptors.
Sympathetic preganglionic fibers release the neurotransmitter acetylcholine (ACh) onto the ganglionic neurons in the...

ECG Interpretation of Arrhythmias II: Atrial, Junctional and Ventricular Arrhythmias

ECG Interpretation of Arrhythmias II: Atrial, Junctional and Ventricular Arrhythmias

Arrhythmia is a condition characterized by an irregular heart rhythm, with ECG changes that differ based on its origin and nature. The types of arrhythmias discussed below include atrial, junctional, and ventricular arrhythmias.Atrial ArrhythmiasPremature Atrial Complexes (PACs): PACs are early atrial beats caused by stress, caffeine, alcohol, electrolyte imbalances, hypoxia, hyperthyroidism, or certain medications (e.g., bronchodilators and decongestants). The ECG shows early P waves with an...

Electrical Synapses

Electrical Synapses

Electrical synapses found in all nervous systems play important and unique roles. In these synapses, the presynaptic and postsynaptic membranes are very close together (3.5 nm) and are actually physically connected by channel proteins forming gap junctions.
Gap junctions allow the current to pass directly from one cell to the next. In contrast, in the chemical synapse, the neurotransmitters carry the information through the synaptic cleft from one neuron to the next. They consist of two...

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Related Experiment Video

Updated: May 23, 2026

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

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

Published on: May 22, 2018

The autonomic ether: emerging electrophysiologic associations.

Suraj Kapa¹, Jennifer A Mears, Samuel J Asirvatham

¹Division of Cardiology, Department of Medicine, University of Pennsylvania, Philadelphia, PA, USA.

Indian Heart Journal

|April 14, 2012

Summary

Large trials have increased implantable cardioverter-defibrillator (ICD) use for sudden cardiac arrest prevention. This review aids clinicians in understanding and troubleshooting common ICD device malfunctions.

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

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Location, Dissection, and Analysis of the Murine Stellate Ganglion

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Published on: December 22, 2020

Area of Science:

Cardiology
Medical Devices
Electrophysiology

Background:

Large multicenter trials support implantable cardioverter-defibrillators (ICDs) for sudden cardiac arrest prevention.
The widespread adoption of ICD therapy presents challenges for clinicians in device management.
Cardiologists and general practitioners require updated knowledge on ICD function and troubleshooting.

Purpose of the Study:

To provide an overview of basic implantable cardioverter-defibrillator (ICD) function.
To describe common ICD malfunctions and their troubleshooting strategies.
To equip healthcare providers with essential knowledge for managing ICD device issues.

Main Methods:

Literature review of recent multicenter trials and clinical guidelines.
Synthesis of information on basic ICD device operation.
Compilation of common device-related problems and diagnostic approaches.

Main Results:

Increased utilization of ICDs necessitates enhanced clinical expertise in device management.
Understanding fundamental ICD function is crucial for identifying malfunctions.
Common issues include lead problems, inappropriate shocks, and sensing abnormalities.

Conclusions:

Effective troubleshooting of ICDs requires a solid grasp of device function.
Clinicians must be prepared to address a range of common ICD malfunctions.
This review serves as a practical guide for managing ICD therapy and resolving device-related complications.