Objective To analyze the position of electrode lead in interventricular septum (IVS) in patients after left bundle branch pacing (LBBP) under guidance of extremely simple technique,and provide guidance for more convenient implementation of LBBP in clinical practice.Methods The patients with planed LBBP (n=32) were chosen from the 980th Hospital of Chinese PLA Joint Logistics Support Force from July 2021 to Aug.2023.All patients were given LBBP under guidance of extremely simple technique.The parameters of pacing and electrocardiogram (ECG),and indexes of echocardiogram were retrospectively analyzed.Results Among 32 patients,there were 16 male patients (50％),and average age was (70.6±13.3).The disease causes in patients included sick sinus syndrome,atrioventricular block (AVB),atrial fibrillation (AF) with long intervals,and heart failure (HF) with complete left bundle branch block (LBBB).The time to peak of R wave in lead V6 was (73.2±7.6) ms.The pacing threshold,perception and impedance parameters were stable,and postoperative QRS duration was significantly shorter than that before LBBP (115.1±25.7 vs.94.1±15.4,P＜0.01).The position of electrode lead was clearly displayed by echocardiography,with an implantation depth of 10.0 (9.0,11.2) mm,and ratio of lead tip depth to IVS thickness was 1.0 (0.9,1.0) mm,and insertion angle of electrode lead was (93.0±31.2).There were 10 patients with vertical insertion into IVS,accounting for 31.3％ of all patients.The distance between electrode lead and tricuspid annulus was (26.6±7.7) mm.Conclusion In LBBP under guidance of extremely simple technique,insertion angle of electrode lead and ratio of lead tip depth to IVS thickness are appropriate.LBBP under guidance of extremely simple technique is not affect tricuspid function with stable parameters and can be safely applied in clinical practice.
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