This term can be confusing, as not all ECG leads contain all three of these waves; yet a “QRS complex” is said to be present regardless. For example, the normal QRS complex in lead V1 does not ...

Because the normal ventricular conduction system (His-Purkinje) is used, the QRS complex is frequently narrow. A junctional rhythm is normally slow — less than 60 beats per minute. When faster ...

During atrial overdrive pacing at a cycle length of 420 ms, the following EKG was recorded (Fig. 1). What is the mechanism for the progressive widening of QRS complexes and for the normal narrow ...

The result on the ECG is sawtooth-looking waves, instead of normal P-waves; not all of these are followed by a QRS complex so there are sometimes two P-sawtooth-waves preceding a QRS, which is ...

The rhythm is regular with a rate of 30 beats/min. The QRS complex duration is normal (0.08 sec) and there is a normal morphology, although there is a narrow R' in lead V1. This has often been ...

The ability to identify an abnormality on the 12-lead ECG ... considered normal in highly trained athletes. Sinus arrhythmia is also common, particularly in younger athletes. IRBBB (commonly ...