The QRS complexes are narrow (0.08 sec) and have a normal morphology and normal axis between 0° and +90° (positive QRS complex in leads I and aVF). The average heart rate is 42 bpm. The QT/QTc ...

The QRS complexes are narrow (0.08 sec) and have a normal morphology and normal axis between 0 ° and +90 ° (positive QRS complex in leads I and aVF). The average rate is 42 beats/min. The QT/QTc ...

In the first place, the 'normal"-appearing QRS complex may actually represent only pseudonormalization, in that a minor degree of anomalous preexcitation may still be present, though not apparent ...

All patients has a normal QRS duration (<0.08 sec.). (*P<0.001 vs. NL) At Both rest and peak exercise, patients with a hemoglobinopathy had prolongation of their QT c interval as compared to normal.