What does the QRS wave on an EKG represent?

The QRS wave on an EKG represents ventricular depolarization and contraction. This is a key phase in the cardiac cycle where the electrical signals trigger the ventricles to contract, resulting in the pumping of blood into the pulmonary artery and aorta. The QRS complex is prominently visible on an EKG as it reflects the rapid depolarization of the right and left ventricles, which is essential for effective heart function.

In the context of an EKG, the QRS wave follows the P wave, which indicates atrial depolarization, and precedes the T wave, which represents ventricular repolarization. Understanding this sequence is crucial for interpreting cardiac rhythms accurately. The strength and duration of the QRS wave can provide insights into the health of the heart's conduction pathways and ventricular functioning.