In a “normal” electrocardiogram (ECG), the transition of the QRS axis in the precordial leads occurs between leads V 3 and V 4 (i.e., there is a dominant S in V 3 and a dominant R in V 4).

The QRS complex is positive in lead I and negative in lead II and also negative in lead aVF – indicating left axis deviation TIP When you see RBBB always look for 1 st degree heart block and/or left ...

From the Cardiology and Surgery Branches, National Heart Institute. Select the format you want to export the citation of this publication.

An atrial septal defect of the secundum type is relatively common and occurs from failure of the septum secundum to develop. This results in a communication between the left and right atrium directly ...

Oct. 23, 2002 (Boston) — Exercise stress testing can help pediatricians decide whether to put young athletes on medication to control accelerated ventricular rhythms (AVR), according to a study ...

1 Department of Cardiology, St Vincent's Hospital, Melbourne, Australia 2 Department of Medicine St Vincent's, University of Melbourne, Melbourne, Australia Background In 2010, the European Society of ...