What does the P wave represent in an EKG?

The P wave on an EKG represents atrial contraction, also known as atrial depolarization. It is the first deflection seen on the EKG tracing and indicates that the atria are being electrically activated, leading to their contraction. This contraction pushes blood from the atria into the ventricles, preparing them for the subsequent ventricular contraction. The timing and shape of the P wave can provide valuable information about the rhythm and health of the heart, making it an essential element in diagnosing various cardiac conditions. Understanding the significance of the P wave is crucial for interpreting EKG readings effectively.