Note that the first three account for almost 90% of ECG tracings with LAD. If the QRS is predominantly negative in lead I and positive in lead aVF, then the axis is rightward (right axis deviation).

A 76-year-old woman presents with a persistently rapid heart rate that she attributes to her pacemaker. What does the ECG ...

ST segment elevation from pericarditis is diffuse (all leads except ... on the ECG. Ostium primum atrial septal defects cause an incomplete right bundle branch block with left axis deviation.

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).

These include findings suggestive of cardiomyopathy such as T-wave inversion, ST depression, pathological Q-waves, left axis deviation and conduction delays and findings suggestive or diagnostic of ...