Left bundle branch block with right axis deviation: A marker of congestive cardiomyopathy

Prognostic Impact of QRS Axis Deviation in Patients Treated With Cardiac Resynchronization Therapy

“…9 RAD is instead a quite uncommon finding and has been attributed to a conduction abnormality in posterior ramus of the left bundle branch. 13,14 Both LAD and RAD in LBBB have been associated in previous studies in different populations with an increased incidence of myocardial dysfunction, more advanced conduction disease, and greater cardiovascular mortality than those with NA. 9,13,14 It is possible that this in turn may have contributed to the poor clinical outcome in this patient cohort.…”

“…LAD in LBBB reflects abnormalities in activation of the LV that can occur at a septal, distal Purkinje system or parietal LV level . RAD is instead a quite uncommon finding and has been attributed to a conduction abnormality in posterior ramus of the left bundle branch . Both LAD and RAD in LBBB have been associated in previous studies in different populations with an increased incidence of myocardial dysfunction, more advanced conduction disease, and greater cardiovascular mortality than those with NA .…”

“…There is a paucity of data examining the influence of this “axis” of ventricular activation in LBBB patients and much of it remains controversial . Notably, the presence of a left or right AD (LAD or RAD) in LBBB has been associated with more advanced cardiovascular abnormalities, resulting in an altered distribution of the impulse within the left ventricle . The aim of this study was therefore to investigate the clinical relevance of QRS axis deviation in LBBB patients undergoing CRT.…”

“…[8][9][10][11][12] Notably, the presence of a left or right AD (LAD or RAD) in LBBB has been associated with more advanced cardiovascular abnormalities, 13 resulting in an altered distribution of the impulse within the left ventricle. [14][15][16][17] The aim of this study was therefore to investigate the clinical relevance of QRS axis deviation in LBBB patients undergoing CRT.…”

Differential diagnosis of tachycardia with a typical left bundle branch block morphology

“…LBBB with right axis deviation (RAD) is uncommon and suggestive of cardiomyopathy [33] . Intermittent RAD has been reported with induced aberration [34] .…”