What does the QRS complex on an ECG represent?

The QRS complex on an ECG represents ventricular depolarization, which is a crucial phase of the cardiac cycle. During this phase, the electrical impulses travel through the heart’s conduction system, leading to the contraction of the ventricles. This depolarization generates the electrical signals that are recorded as the QRS complex on the electrocardiogram.

As the ventricles depolarize, they prepare to contract and pump blood to the lungs and the rest of the body. This event is visually represented on the ECG as a rapid upward and downward deflection, which is important for determining heart rhythm and function. Understanding this concept is essential for interpreting cardiac health and diagnosing potential issues related to ventricular function.