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Related Concept Videos

Electrocardiogram Fundamentals01:28

Electrocardiogram Fundamentals

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Introduction
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...
549

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Related Experiment Video

Updated: Jun 14, 2025

Benefits of Cardiac Resynchronization Therapy in an Asynchronous Heart Failure Model Induced by Left Bundle Branch Ablation and Rapid Pacing
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Automatic Threshold Function With Left Bundle Branch Area Versus Traditional Right Ventricular Lead Placement.

Daniel J Friedman1, Jessica Burr2, Paul W Jones2

  • 1Duke University School of Medicine, Durham, North Carolina, USA.

Journal of Cardiovascular Electrophysiology
|April 29, 2025
PubMed
Summary
This summary is machine-generated.

Automatic threshold (AT) algorithms demonstrate high accuracy for left bundle branch area pacing (LBBAP) leads, comparable to traditional right ventricular (RV) leads. This suggests AT algorithms are effective for LBBAP, though further research is needed for specific capture scenarios.

Keywords:
algorithm performanceautomatic thresholdautothresholdconduction system pacingleft bundle branch area pacingremote monitoring

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Area of Science:

  • Electrophysiology
  • Cardiovascular Devices
  • Pacing Technology

Background:

  • Left bundle branch area pacing (LBBAP) combines benefits of His bundle pacing and traditional pacing.
  • The suitability of automatic threshold (AT) algorithms for LBBAP leads is not well-established, unlike their known limitations with His bundle pacing leads.

Purpose of the Study:

  • To evaluate the accuracy of AT algorithms in LBBAP leads compared to right ventricular (RV) leads.
  • To assess the performance of AT algorithms using data from the LATITUDE remote monitoring system.

Main Methods:

  • Retrospective analysis of 1288 pacing devices (798 LBBAP, 490 RV) using LATITUDE remote monitoring data.
  • AT accuracy was compared to in-office pacing capture threshold (PCT) within 7 days.
  • Methodology from the CAPTIVATE trial was adapted to define accurate AT tests (|AT - IO| ≤ 0.6 V or ≤ 1 V if IO > 3.5 V).

Main Results:

  • AT algorithm accuracy was high and similar for both LBBAP (96.9%) and RV (97.6%) leads, exceeding the 90% target.
  • The median difference between AT and in-office PCT for LBBAP leads was 0.1 V.
  • The AT feature was turned off at similar low rates for both LBBAP (1.8%) and RV (0.9%) leads within 6 months.

Conclusions:

  • AT algorithms exhibit high and comparable accuracy for both LBBAP and RV leads.
  • Further investigation is required to confirm algorithm sufficiency for conduction system capture when thresholds differ from myocardial thresholds.