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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...

Cardiac Action Potential

Cardiac Action Potential

Cardiac action potentials are essential for proper heart function, enabling the rhythmic contractions needed for adequate blood circulation. Nodal cells and Purkinje fibers, specialized for electrical conduction, generate these action potentials.
The cardiac action potential process involves a series of phases characterized by the movement of ions across the cardiac cell membranes, leading to the depolarization and repolarization of the cardiac myocytes.
Ionic Basis of Cardiac Action Potentials

Pulse rhythm

Pulse rhythm

Pulse rhythm refers to the pattern of pulsations within specific intervals, offering valuable insights into the regularity or irregularity of the heart's beats as observed through the pattern of pulsation within specific intervals. A regular pulse exhibits a consistent heart rate with uniform waveforms and pulsation force, variations of which can be classified as normal, weak, or bounding.
Conversely, an irregular pulse pattern is termed dysrhythmia, stemming from disruptions in cardiac muscle...

Dysrhythmias IV: Characteristics of Bradyarrhythmias

Dysrhythmias IV: Characteristics of Bradyarrhythmias

Bradyarrhythmias are cardiac rhythm disorders characterized by a slower-than-normal heart rate, typically defined as fewer than 60 beats per minute. Some of which are discussed here:Sinus BradycardiaSinus bradycardia presents a heart rate lower than 60 beats per minute, with a regular rhythm originating from the SA node. The ECG typically shows normal P waves preceding each QRS complex, a normal PR interval (0.12 to 0.20 seconds), and a normal QRS duration (0.06 to 0.10 seconds).First-Degree AV...

Dysrhythmias III: Characteristics of Dysrhythmias

Dysrhythmias III: Characteristics of Dysrhythmias

Dysrhythmias, also known as arrhythmias, are irregular heart rhythms that result from abnormal electrical activity in the heart, affecting its ability to circulate blood efficiently. Tachyarrhythmias, a subset of dysrhythmias, are characterized by abnormally fast heart rates exceeding 100 beats per minute. Here are some types of tachyarrhythmias with their distinct ECG features:Sinus Tachycardia:Sinus tachycardia presents a regular heart rhythm with an increased rate of 101-180 beats per minute.

Conduction System of the Heart

Conduction System of the Heart

Autorhythmicity is a term that refers to the heart's inherent ability to generate electrical signals and instigate muscle contractions. This self-regulating conduction system within the heart consists of two key components: the pacemaker cells and specialized conducting cells.
The pacemaker cells are located in two primary nodes: the sinoatrial (SA) node and the atrioventricular (AV) node. The SA node pacemaker cells can autonomously depolarize, triggering an action potential that leads to the...

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Related Experiment Video

Updated: Jun 26, 2026

Translational Rabbit Model of Chronic Cardiac Pacing

Translational Rabbit Model of Chronic Cardiac Pacing

Published on: January 6, 2023

[Progress in cardiac pacing].

José Martínez Ferrer¹, María L Fidalgo Andrés, Rafael Barba Pichardo

¹Servicio de Cardiología, Hospital Txagorritxu, Vitoria, Alava, España. martinez-ferrer@telefonica.net

Revista Espanola De Cardiologia

|January 29, 2009

Summary

This review covers essential radiological protection principles for interventional cardiologists and highlights impactful cardiac pacing research. It details His-bundle pacing and cardiac contractility modulation techniques.

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Benefits of Cardiac Resynchronization Therapy in an Asynchronous Heart Failure Model Induced by Left Bundle Branch Ablation and Rapid Pacing

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Benefits of Cardiac Resynchronization Therapy in an Asynchronous Heart Failure Model Induced by Left Bundle Branch Ablation and Rapid Pacing

Benefits of Cardiac Resynchronization Therapy in an Asynchronous Heart Failure Model Induced by Left Bundle Branch Ablation and Rapid Pacing

Published on: December 11, 2017

Area of Science:

Radiological protection
Cardiovascular medicine
Cardiac electrophysiology

Context:

Interventional cardiology involves significant radiation exposure.
Recent advancements in cardiac pacing require updated knowledge.
Understanding novel pacing techniques is crucial for clinical practice.

Purpose:

To review fundamental radiological protection principles relevant to interventional cardiologists.
To summarize high-impact scientific articles on cardiac pacing from the past year.
To describe two advanced cardiac pacing techniques: His-bundle pacing and cardiac contractility modulation.

Summary:

The article outlines key radiation safety measures for cardiologists performing interventional procedures.
It reviews significant research findings in cardiac pacing published within the last year.
Detailed explanations of His-bundle pacing and cardiac contractility modulation are provided.

Impact:

Enhances radiation safety awareness and practices among interventional cardiologists.
Provides a concise overview of the latest developments in cardiac pacing technology.
Facilitates the adoption of innovative pacing strategies for improved patient outcomes.