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Electrocardiogram Fundamentals

Electrocardiogram Fundamentals

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An electrocardiogram (ECG) is a diagnostic tool for identifying cardiac conditions such as arrhythmias, conduction abnormalities, and myocardial ischemia.
Definition
An electrocardiogram (ECG) visualizes the heart's electrical activity by tracing the electrical movement associated with each heartbeat on a graph or monitor. As the heart beats, an electrical wave passes through it, correlating with the cardiac cycle events.
Parts of an ECG
An ECG utilizes electrodes on the skin...

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Lower intercostal space V1 placement to guide conduction system pacing lead implants.

Felix Ayala Valani¹, Vartan Mardigyan², Karol Curila³

¹Bishop's University, Sherbrooke, Quebec, Canada; Centre de recherche du CHUS, Sherbrooke, Quebec, Canada.

Journal of Electrocardiology

|May 10, 2025

Summary

Optimizing lead placement for conduction system area pacing (CSP) involves identifying a strong terminal R wave in lead V1. Positioning lead V1 in lower right intercostal spaces enhances this signal, improving left bundle branch area pacing (LBBaP) efficiency and safety.

Keywords:

Conduction system pacing Ekg Lead positioning

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Area of Science:

Electrophysiology
Cardiovascular Medicine
Medical Device Technology

Background:

Conduction system area pacing (CSP) aims to mimic natural cardiac activation.
Left bundle branch area pacing (LBBaP) is a type of CSP requiring specific electrocardiographic criteria.
Identifying optimal lead placement for LBBaP can be challenging.

Purpose of the Study:

To determine the optimal placement of lead V1 for identifying the terminal R wave criterion for CSP.
To enhance the amplitude of the terminal R wave in lead V1 for improved LBBaP.
To streamline the LBBaP procedure and minimize complications.

Main Methods:

Investigated different configurations for lead V1 placement.
Evaluated terminal R wave amplitude in lead V1 with CSP leads in mid-septal or antero-septal locations.
Compared signal characteristics across various lead V1 positions.

Main Results:

Placing lead V1 in lower right intercostal spaces yielded greater terminal R wave amplitudes.
This enhanced signal was observed when CSP leads were deep in mid-septal or antero-septal locations.
Easily identifiable terminal R waves in V1 facilitate practical LBBaP site selection.

Conclusions:

Lower right intercostal placement of lead V1 is recommended for CSP and LBBaP.
Improved V1 signal detection can reduce procedural time and complexity.
This technique may decrease risks like septal perforation during LBBaP.