Some variations of right bundle branch blocks can occur. There are times when a QRS complex may appear in a RBBB pattern intermittently. This is the case in premature ventricular contractions that ...

This QRS morphology has a typical left bundle branch block pattern, is irregular and does not meet the Brugada criteria for ventricular tachycardia (see the ventricular tachycardia review below).

These ECG voltage attenuations are of extracardiac mechanism, and impact the amplitude of QRS complexes, P-waves, and T-waves, occasionally resulting also in shortening of the QRS complex and QT ...

Studies investigating QRS-complex abnormalities in association ... Only one case within a case series linked cocaine use to an acquired Brugada pattern; however, numerous individual case reports ...