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Journal ArticleDOI

Programmed deep septal stimulation: A novel maneuver for the diagnosis of left bundle branch capture during permanent pacing

TLDR
Permanent deep septal stimulation with capture of the left bundle branch (LBB) enables maintenance/restoration of the physiological activation of theleft ventricle.
Abstract
Introduction Permanent deep septal stimulation with capture of the left bundle branch (LBB) enables maintenance/restoration of the physiological activation of the left ventricle. However, it is almost always accompanied by the simultaneous engagement of the local septal myocardium, resulting in a fused (nonselective) QRS complex, therefore, confirmation of LBB capture remains difficult. Methods We hypothesized that programmed extrastimulus technique can differentiate nonselective LBB capture from myocardial-only capture as the effective refractory period (ERP) of the myocardium is different from the ERP of the LBB. Consecutive patients undergoing pacemaker implantation underwent programmed stimulation delivered from the lead implanted in a deep septal position. Responses to programmed stimulation were categorized on the basis of sudden change in the QRS morphology of the extrastimuli, observed when ERP of LBB or myocardium was encroached upon, as: "myocardial," "selective LBB," or nondiagnostic (unequivocal change of QRS morphology). Results Programmed deep septal stimulation was performed 269 times in 143 patients; in every patient with the use of a basic drive train of 600 milliseconds and in 126 patients also during intrinsic rhythm. The average septal-myocardial refractory period was shorter than the LBB refractory period: 263.0 ± 34.4 vs 318.0 ± 37.4 milliseconds. Responses diagnostic for LBB capture ("myocardial" or "selective LBB") were observed in 114 (79.7%) of patients. Conclusions A novel maneuver for the confirmation of LBB capture during deep septal stimulation was developed and found to enable definitive diagnosis by visualization of both components of the paced QRS complex: selective paced LBB QRS and myocardial-only paced QRS.

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Citations
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Journal ArticleDOI

Left bundle branch pacing: A comprehensive review.

TL;DR: Left bundle branch pacing (LBBP) has been suggested as an effective alternative to overcome the limitations of HBP as it provides low and stable pacing threshold, lead stability, and correction of distal conduction system disease.
Journal ArticleDOI

Physiology-based electrocardiographic criteria for left bundle branch capture

TL;DR: In this paper, the authors established electrocardiographic (ECG) criteria for LBB capture and showed equivalency of LV activation times on ECG during native and paced LBB conduction.
Journal ArticleDOI

Left bundle branch area pacing outcomes: the multicentre European MELOS study

TL;DR: Permanent transseptal left bundle branch area pacing is feasible as a primary pacing technique for both bradyarrhythmia and heart failure indications but success rate in heart failure patients and safety need to be improved.
Journal ArticleDOI

Initial Experience, Safety, and Feasibility of Left Bundle Branch Area Pacing: A Multicenter Prospective Study.

TL;DR: LBBA pacing is safe, feasible, and a reliable alternative to His bundle pacing for providing physiological pacing and Randomized controlled studies are needed to confirm the safety, feasibility, and clinical outcomes of LBBAP.
References
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Journal ArticleDOI

A Novel Pacing Strategy With Low and Stable Output: Pacing the Left Bundle Branch Immediately Beyond the Conduction Block

TL;DR: The case shows a novel pacing strategy for patients with BBB that affects many patients with heart failure, and demonstrates the feasibility of pacing the left bundle branch (LBB) immediately beyond the conduction block to functionally restore the impaired His-Purkinje conduction system.
Journal ArticleDOI

Prospective evaluation of feasibility and electrophysiologic and echocardiographic characteristics of left bundle branch area pacing

TL;DR: HBP and LBBAP may significantly increase the overall success of physiologic pacing and be feasible in a high percentage of patients with low thresholds during acute follow-up.
Journal ArticleDOI

Permanent left bundle branch area pacing for atrioventricular block: Feasibility, safety, and acute effect

TL;DR: Preliminary results indicate that LBBAP holds promise as an attractive physiological pacing strategy for AVB, and cardiac function and left ventricular synchronization by 2-dimensional echocardiographic strain imaging at the 3-month follow-up slightly improved compared with that at baseline.
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