What does the P Wave on an EKG typically signify?

The P Wave on an EKG represents atrial depolarization, which directly corresponds to the contraction of the atria. When the atria depolarize, they generate an electrical impulse that causes the muscle fibers in the atrial walls to contract, pushing blood into the ventricles. This electrical event is the first part of the cardiac cycle and is critical for initiating the heart's pumping action. The P Wave is typically the first deflection observed on the EKG waveform, making it a clear indicator of atrial activity. Understanding this is essential for interpreting the EKG accurately, as it provides vital information about the heart's electrical conduction and overall rhythm.