For example, the normal QRS complex in lead V1 does not contain a Q wave — only a R wave and S wave — but the combination of the R wave and S wave is still referred to as the QRS complex for ...

If upward in lead V1 (RBBB pattern), then VT is present in ... AV node and the resulting QRS is a “fusion beat” of the normal QRS morphology and that of the ventricular morphology from the ...

6,11 Heart rates ≥30 beats/min are considered normal in highly trained athletes. Sinus arrhythmia is also common, particularly in younger athletes. IRBBB (commonly characterised as an rSR′ pattern in ...