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Electrophysiology of Normal Cardiac Rhythm

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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 of...

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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.

Pulse rhythm

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Translational Rabbit Model of Chronic Cardiac Pacing

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Published on: January 6, 2023

A most unusual pacemaker.

Vivek Iyer¹, Tamim M Nazif, Jesus Vazquez

¹Department of Medicine, Division of Cardiology, Columbia University Medical Center, New York, New York, USA.

Pacing and Clinical Electrophysiology : PACE

|April 2, 2011

Summary

This summary is machine-generated.

A gastric pacemaker artifact mimicked cardiac pacemaker malfunction on an electrocardiogram. This case highlights the importance of considering extracardiac devices when interpreting cardiac pacemaker function.

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Area of Science:

Cardiology
Gastroenterology
Biomedical Engineering

Background:

Dual-chamber cardiac pacemakers are crucial for managing bradyarrhythmias.
Diabetic gastroparesis is a debilitating condition affecting gastric motility.
Extracardiac pacemakers are used for refractory gastrointestinal motility disorders.

Observation:

A patient presented with electrocardiogram (ECG) findings initially suggestive of cardiac pacemaker malfunction.
The artifactual signals originated from an extracardiac gastric pacemaker implanted for severe diabetic gastroparesis.

Findings:

The 12-lead ECG artifact was misattributed to a malfunctioning dual-chamber cardiac pacemaker.
Both the cardiac and gastric pacemakers were functioning correctly.
Interference between the two implanted electronic devices was investigated and managed through setting adjustments.

Implications:

Clinicians must consider extracardiac devices when interpreting cardiac device function on ECG.
Careful evaluation is needed to differentiate true pacemaker malfunction from artifact.
Management strategies for patients with multiple implanted electronic devices require careful consideration of potential interdevice interference.