What is the initial negative deflection produce by ventricular polarization?

The initial negative deflection produced by ventricular polarization is known as the Q wave in the electrocardiogram (ECG). It reflects the depolarization of the interventricular septum, where electrical impulses spread from the atrioventricular node through the bundle of His and into the right and left bundle branches. This initial downward deflection is crucial for diagnosing various cardiac conditions, as its presence and characteristics can indicate issues with ventricular function or conduction abnormalities.