{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,7,28]],"date-time":"2026-07-28T14:12:34Z","timestamp":1785247954610,"version":"3.55.0"},"reference-count":13,"publisher":"Frontiers Media SA","license":[{"start":{"date-parts":[[2023,3,22]],"date-time":"2023-03-22T00:00:00Z","timestamp":1679443200000},"content-version":"vor","delay-in-days":0,"URL":"https:\/\/creativecommons.org\/licenses\/by\/4.0\/"}],"content-domain":{"domain":["frontiersin.org"],"crossmark-restriction":true},"short-container-title":["Front. Cardiovasc. Med."],"abstract":"<jats:sec><jats:title>Background<\/jats:title><jats:p>Left bundle branch pacing (LBBP) produces delayed, unphysiological activation of the right ventricle. Using ultra-high-frequency electrocardiography (UHF-ECG), we explored how bipolar anodal septal pacing with direct LBB capture (aLBBP) affects the resultant ventricular depolarization pattern.<\/jats:p><\/jats:sec><jats:sec><jats:title>Methods<\/jats:title><jats:p>In patients with bradycardia, His bundle pacing (HBP), unipolar nonselective LBBP (nsLBBP), aLBBP, and right ventricular septal pacing (RVSP) were performed. Timing of local ventricular activation, in leads V1\u2013V8, was displayed using UHF-ECG, and electrical dyssynchrony (e-DYS) was calculated as the difference between the first and last activation. Durations of local depolarizations were determined as the width of the UHF-QRS complex at 50% of its amplitude.<\/jats:p><\/jats:sec><jats:sec><jats:title>Results<\/jats:title><jats:p>aLBBP was feasible in 63 of 75 consecutive patients with successful nsLBBP. aLBBP significantly improved ventricular dyssynchrony (mean \u22129 ms; 95% CI (\u221212;\u22126) vs. \u221224 ms (\u221227;\u221221), ), <jats:italic>p<\/jats:italic> &amp;lt; 0.001) and shortened local depolarization durations in V1\u2013V4 (mean differences \u22127 ms to \u22125 ms (\u221211;\u22121), <jats:italic>p<\/jats:italic> &amp;lt; 0.05) compared to nsLBBP. aLBBP resulted in e-DYS \u22129 ms (\u221212; \u22126) vs. e-DYS 10 ms (7;14), <jats:italic>p<\/jats:italic> &amp;lt; 0.001 during HBP. Local depolarization durations in V1\u2013V2 during aLBBP were longer than HBP (differences 5-9 ms (1;14), <jats:italic>p<\/jats:italic> &amp;lt; 0.05, with local depolarization duration in V1 during aLBBP being the same as during RVSP (difference 2 ms (\u22122;6), <jats:italic>p<\/jats:italic> = 0.52).<\/jats:p><\/jats:sec><jats:sec><jats:title>Conclusion<\/jats:title><jats:p>Although aLBBP improved ventricular synchrony and depolarization duration of the septum and RV compared to unipolar nsLBBP, the resultant ventricular depolarization was still less physiological than during HBP.<\/jats:p><\/jats:sec>","DOI":"10.3389\/fcvm.2023.1140988","type":"journal-article","created":{"date-parts":[[2023,3,22]],"date-time":"2023-03-22T05:38:00Z","timestamp":1679463480000},"update-policy":"https:\/\/doi.org\/10.3389\/crossmark-policy","source":"Crossref","is-referenced-by-count":22,"title":["Bipolar anodal septal pacing with direct LBB capture preserves physiological ventricular activation 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