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

The length of a normal P wave on an ECG typically measures 0.10 seconds or less. This duration reflects the time it takes for the electrical impulse to travel through the atria, resulting in atrial depolarization. During this depolarization, the muscle fibers of the atria contract, contributing to the overall heart rhythm.

When evaluating the normal P wave duration, it's essential to understand that a length greater than 0.10 seconds may indicate various cardiac issues, such as atrial enlargement or other conduction problems. Monitoring the P wave is crucial for assessing atrial activity and ensuring proper heart function, making a measurement under 0.10 seconds significant for diagnosing potential arrhythmias or other heart conditions.