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Related Concept Videos

Dysrhythmias IV: Characteristics of Bradyarrhythmias01:18

Dysrhythmias IV: Characteristics of Bradyarrhythmias

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Bradyarrhythmias are cardiac rhythm disorders characterized by a slower-than-normal heart rate, typically defined as fewer than 60 beats per minute. Some of which are discussed here:Sinus BradycardiaSinus bradycardia presents a heart rate lower than 60 beats per minute, with a regular rhythm originating from the SA node. The ECG typically shows normal P waves preceding each QRS complex, a normal PR interval (0.12 to 0.20 seconds), and a normal QRS duration (0.06 to 0.10 seconds).First-Degree AV...
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Updated: Aug 25, 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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Right ventricular lead sensing latency in pacemaker therapy.

Fani Zagkli1, Nikoleta Kalovrenti1, Panagiotis Patrinos1

  • 1Department of Cardiology University Hospital of Patras Patras Greece.

Journal of Arrhythmia
|October 14, 2022
PubMed
Summary
This summary is machine-generated.

Pacemaker sensing latency is longer with a pacing system analyzer than the implanted pacemaker. Right bundle branch block and Medtronic pacemakers also show increased latency, impacting AV delay optimization.

Keywords:
pacemakerpacing system analyzerright ventricular leadsensing latency

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Area of Science:

  • Cardiology
  • Biomedical Engineering
  • Electrophysiology

Background:

  • Intraoperative testing of ventricular sensing during pacemaker implantation uses a pacing system analyzer (PSA).
  • The PSA's sensing values are expected to correlate with those measured by the implanted pacemaker.
  • This study investigates the sensing latency of the right ventricular (RV) lead.

Purpose of the Study:

  • To determine the sensing latency of the RV lead.
  • To compare sensing latency between intraoperative PSA testing and post-implantation pacemaker measurements.
  • To identify factors influencing RV lead sensing latency, such as QRS duration and pacemaker manufacturer.

Main Methods:

  • 157 patients without significant heart disease underwent dual-chamber pacemaker implantation with RV lead on the mid-septum.
  • Sensing latency (Q-VS interval) was measured using both PSA and the implanted pacemaker.
  • Patients were categorized by QRS duration (narrow QRS <120 ms vs. wide QRS with complete right bundle branch block [RBBB]).

Main Results:

  • RV lead sensing latency was significantly longer with PSA (50.9 ms for narrow QRS, 67.8 ms for RBBB) compared to the pacemaker (18.2 ms for narrow QRS, 31.2 ms for RBBB) (p < 0.001).
  • RBBB patients exhibited longer sensing latency than narrow QRS patients with both PSA and pacemaker (p < 0.001).
  • Medtronic pacemaker recipients showed longer latency than Abbott recipients in narrow QRS patients (p < 0.05), but not in RBBB patients.

Conclusions:

  • RV lead sensing latency is consistently longer when measured by PSA compared to the implanted pacemaker.
  • Sensing latency is greater in patients with RBBB compared to those with narrow QRS.
  • Medtronic pacemakers demonstrated longer sensing latency than Abbott pacemakers in narrow QRS patients.
  • Understanding sensing latency is crucial for optimizing atrioventricular (AV) delay settings in pacemaker patients.