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Dysrhythmia management involves a multifaceted approach, incorporating pharmacological treatments, medical procedures, surgical interventions, lifestyle modifications, and patient education.Pharmacological ManagementAntiarrhythmic Drugs:Class I (Sodium Channel Blockers): This class includes quinidine and procainamide, which reduce the speed of impulse conduction in the heart, stabilize the cardiac membrane, and control arrhythmias. Quinidine and procainamide are Class IA agents that prolong the...
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Electrical synchronization achieved by multipoint pacing combined with dynamic atrioventricular delay.

David O'Donnell1,2, Brian Wisnoskey3, Nima Badie4

  • 1GenesisCare Cardiology, Burgundy Street, Heidelberg, Victoria, 3084, Australia. odonnell_research@hotmail.com.

Journal of Interventional Cardiac Electrophysiology : an International Journal of Arrhythmias and Pacing
|August 3, 2020
PubMed
Summary
This summary is machine-generated.

Combining SyncAV with multipoint pacing (MPP) significantly enhances electrical synchrony in cardiac resynchronization therapy (CRT). This approach further improves left ventricular (LV) electrical synchrony beyond conventional CRT methods.

Keywords:
Atrioventricular delayCardiac resynchronization therapyHeart failureMultipoint pacingQRS duration

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Area of Science:

  • Cardiology
  • Electrophysiology
  • Medical Devices

Background:

  • Multipoint pacing (MPP) is known to improve left ventricular (LV) electrical synchrony in cardiac resynchronization therapy (CRT).
  • SyncAV technology automatically adjusts atrioventricular delay (AVD) based on intrinsic AV intervals, potentially enhancing synchrony further.
  • The combined effect of MPP and SyncAV on electrical synchrony has not been previously evaluated.

Purpose of the Study:

  • To assess the improvement in electrical synchrony achieved by combining SyncAV with MPP in patients undergoing CRT.
  • To evaluate the efficacy of this combined approach in an international, multicenter setting.

Main Methods:

  • Prospective enrollment of patients with LBBB undergoing CRT implantation using a quadripolar lead.
  • Measurement of QRS duration (QRSd) via 12-lead ECG under intrinsic conduction, biventricular (BiV) pacing, MPP, BiV + SyncAV, and MPP + SyncAV.
  • Individualized SyncAV offsets were determined to achieve the narrowest QRSd during BiV pacing.

Main Results:

  • Compared to intrinsic conduction (165 ± 16 ms), BiV pacing reduced QRSd by 11.9% (145 ± 18 ms) and MPP by 13.3% (142 ± 19 ms).
  • BiV + SyncAV reduced QRSd by 22.0% (128 ± 13 ms), nearly doubling the reduction seen with BiV pacing alone.
  • MPP + SyncAV further reduced QRSd by 25.6% (122 ± 14 ms) compared to intrinsic conduction, showing a significant improvement over BiV + SyncAV.

Conclusions:

  • SyncAV significantly enhances acute electrical synchrony in CRT patients.
  • The addition of MPP to SyncAV provides further significant improvements in electrical synchrony.