What is a Q wave?

A Q wave is defined as the first negative deflection that appears after the P wave on an electrocardiogram (EKG). It represents the initial phase of depolarization of the interventricular septum, which occurs during ventricular excitation. The presence and depth of the Q wave can provide important clinical information about possible myocardial infarction or other heart conditions.

In recognizing a Q wave, it is essential to understand that it follows the P wave, which is associated with atrial depolarization. The characteristics of Q waves can be indicative of pathological conditions, such as the previous necrosis of heart tissue. Proper identification and analysis of Q waves is crucial for accurate interpretation of EKG findings.