This is referred to as an “ectopic atrial rhythm” or “ectopic P wave.” Atrial tachycardia ... is seen very commonly on ambulatory ECG monitoring in the elderly and is frequently asymptomatic.

The ECG findings presented as normal in athletes were established by an international ... In an ectopic atrial rhythm, P waves are present but are a different morphology compared to the sinus P wave.

The ECG will show a premature, ectopic P wave and then no QRS complex afterward. When this occurs in a pattern of bigeminy, the interpreter may be fooled into thinking that sinus bradycardia is ...