If the QRS complex is widened and downwardly deflected in lead V1, a left bundle branch block is present ... The ECG strip below shows normal sinus rhythm, then atrial fibrillation with a rapid ...

Normal sinus rhythm Left bundle branch block First degree AV block Carbrera's sign - possible myocardial infarction Cabrera’s sign is used to diagnose an acute myocardial infarction in the ...

The QRS rate for junctional rhythms is typically less than 100 beats/min, and the QRS complex usually narrow unless the baseline QRS has a bundle branch block. Sinus rhythm resumes with increased ...