Ectopic P waves are most easily seen when the P waves are negative ... The standards for QRS voltage have been derived from studies of populations of clinically normal children. Furthermore, the ...

This is not the time to learn about the different P-wave morphologies that occur with atrial enlargements and ectopic atrial rhythms — but rather, it is the time to learn what the normal P wave ...

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. A sinus morphology is an upright P wave in lead II and ...