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 ...

If the QRS complex is widened and downwardly deflected in lead V1, a left bundle branch block is present. If the QRS complex is widened and upwardly deflected in lead V1, a right bundle branch ...

left bundle branch block and intraventricular conduction delays, left atrial abnormality, and QT-interval prolongation. In addition to the above well-known applications of the ECG for patients ...