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. 2023 May 25;10:1187754. doi: 10.3389/fcvm.2023.1187754

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© 2023 Wijesuriya, Mehta, De Vere, Strocchi, Behar, Niederer and Rinaldi.

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Response to LBBP. (A) ECG showing SR and LBBB with QRSd 156 ms. (B) Pacing with AV delay set at 40 ms resulted in resulted in QRSd of 128 ms. (C) Pacing with AV delay set at 80 ms resulted in normalization of QRSd to 120 ms.