Jam with Confidence: Rock Your Certified Rhythm Analysis Technician Exam 2026!

The first negative deflection in the QRS complex is referred to as the Q wave. In the context of an electrocardiogram (ECG), the QRS complex represents the electrical activity associated with ventricular depolarization.

The Q wave is specifically the initial negative deflection that occurs before any positive deflection (R wave) and is typically the first part of the complex. This negative deflection indicates that the electrical impulse is moving towards the electrodes and reflects a change in voltage as the ventricles begin to contract. Understanding the characteristics of the QRS complex, including the identification of the Q wave, is crucial for interpreting cardiac rhythms and diagnosing various cardiac conditions, making this knowledge vital for rhythm analysis technicians.