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 ...

The criteria to diagnose a LAFB, or LAHB, on ECG include the following: Left axis deviation of at least -45 degrees The presence of a qR complex in lead I and a rS complex in lead III Usually a rS ...

This ECG shows a wide-complex tachycardia in a right bundle branch block pattern going quite fast (heart rate about 150 BPM). Note the morphology of the QRS complex in lead V6. There is a RS ...

Also the importance of using all 12 electrocardiogram (ECG) leads, methods for accurate detection of QRS complex onset and QT offset, various mathematical and geometrical treatments of the QT ...