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 ...

Sinus bradycardia occurs on an ECG when there is a normal upright P wave in lead II ― sinus P wave ― preceding every QRS complex with a ventricular rate of less than 60 beats per minute.

They are ectopic. Meaning they originate outside of the SA node. Thus, the P wave morphology would be different than the normal sinus P wave. They are narrow complexes. Since they come from the ...