What is the normal duration of a P wave on an ECG?

A normal P wave on an electrocardiogram (ECG) typically has a duration of 0.10 seconds or less. This indicates that the time taken for atrial depolarization, which is represented by the P wave, is efficient and falls within the expected range for normal cardiac function. A P wave that exceeds this duration may suggest underlying issues such as atrial enlargement or other cardiac abnormalities. Thus, a duration of 0.10 seconds or less ensures that the electrical activity of the atria is functioning normally, contributing to proper heart rhythm and overall cardiovascular health.