The QRS complex consists of the Q wave, the R wave and the S wave. The QRS complex comes after the P wave when the SA nodal action potential travels through the AV node to the ventricles to cause ...

Rather, this QRS complex (•) is a junctional escape complex. The pause is the result of a nonconducted premature P wave (↓) or a blocked PAC, which can be seen at the end of the 4th QRS ...

This results in an upright P wave in lead II on the ECG. If there is a P wave before every QRS complex, and it has a sinus morphology, then normal sinus rhythm, or NSR, is said to be present.

The QRS complex is wide (0.14 s). A terminal S wave in leads I and V5-V6 (^) is consistent with terminal forces moving from left to right, suggesting RBBB. However, the QRS complex morphology in ...