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Related Experiment Video

Updated: May 31, 2026

Benefits of Cardiac Resynchronization Therapy in an Asynchronous Heart Failure Model Induced by Left Bundle Branch Ablation and Rapid Pacing
12:45

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

Left ventricular pacing with long pulse duration can avoid phrenic nerve stimulation.

Seil Oh1, Woo-Young Kim, Hee Chan Kim

  • 1Department of Internal Medicine, Seoul National University College of Medicine and Seoul National University Hospital, Seoul, Korea. seil@snu.ac.kr

Heart Rhythm
|June 25, 2011
PubMed
Summary

Left ventricular (LV) pacing can be achieved without phrenic nerve (PN) stimulation by using longer pulse durations. This finding is crucial for developing new cardiac resynchronization therapy devices.

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Area of Science:

  • Electrophysiology
  • Cardiovascular device development

Background:

  • Phrenic nerve stimulation is a significant limitation in left ventricular (LV) pacing.
  • Understanding the electrical properties of the phrenic nerve (PN) and LV is essential for optimizing pacing strategies.

Purpose of the Study:

  • To compare the strength-duration characteristics of the left phrenic nerve (PN) and left ventricular (LV) epicardium.
  • To determine optimal pacing parameters to avoid phrenic nerve stimulation during LV pacing.

Main Methods:

  • Evaluated capture thresholds of the PN and LV in a canine model using various pulse durations (0.25–2.0 ms).
  • Assessed LV pacing thresholds at the epicardium adjacent to the PN.
  • Defined PN threshold as the amplitude causing diaphragmatic contraction and LV threshold as the amplitude causing loss of 1:1 capture.

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Related Experiment Videos

Last Updated: May 31, 2026

Benefits of Cardiac Resynchronization Therapy in an Asynchronous Heart Failure Model Induced by Left Bundle Branch Ablation and Rapid Pacing
12:45

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

Optocardiography and Electrophysiology Studies of Ex Vivo Langendorff-perfused Hearts
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Optocardiography and Electrophysiology Studies of Ex Vivo Langendorff-perfused Hearts

Published on: November 7, 2019

Translational Rabbit Model of Chronic Cardiac Pacing
06:14

Translational Rabbit Model of Chronic Cardiac Pacing

Published on: January 6, 2023

Main Results:

  • The PN exhibited a higher rheobase and shorter chronaxie compared to the LV.
  • LV pacing required higher amplitudes than PN pacing for pulse durations less than 1.0 ms.
  • At a 2.0 ms pulse duration, LV pacing demonstrated significantly lower thresholds than PN pacing, particularly with unipolar pacing.

Conclusions:

  • Left ventricular pacing without phrenic nerve stimulation is feasible with extended pulse durations.
  • Longer pulse durations offer a viable strategy for developing advanced LV pacing devices, including those for cardiac resynchronization therapy.