AF, atrial fibrillation; AS, aortic stenosis; AVB, atrioventricular block; BBB, bundle branch block; BiVp, biventricular pacing; Ca, cancer; CCF, prior congestive cardiac failure; CHB, complete heart block; CKD, chronic kidney disease; CRT, cardiac resynchronization therapy; DM, diabetes mellitus; ECG, 12 lead electrocardiogram; HLD, hyperlipidemia; HTN, hypertension; ICD, implantable cardiac defibrillator; IHD, ischemic heart disease; IVCD, intraventricular conduction delay; LA, left atrium; LAFB, left anterior fascicular block; LBBP, left bundle branch pacing; LBBB, left bundle branch block; LV. Left ventricle; LVEF, left ventricular ejection fraction; min, minutes; MR, mitral regurgitation; ms, milliseconds; mV, millivolts; MV, mitral valve; MVP, mitral valve prolapse; NICMP, non-ischemic cardiomyopathy; PPM, permanent pacemaker; QRSd, QRS duration; RBBB, right bundle branch block; RV, right ventricle; s/p, status post; SAVR, surgical aortic valve replacement; SMAC, simple mastectomy and axillary clearance; SSS, sick sinus syndrome; SVC, superior vena cava; Tachy-brady, tachycardia bradycardia syndrome; TAVI, transcatheter aortic valve implantation; TR, tricuspid regurgitation; VT, ventricular tachycardia.

† Reason for each unsuccessful LBBP attempt has been previously described in the “Case Series” section.