Basic Arrhythmias With 12 Lead EKG's Practice Test

In the QRS complex, ventricular depolarization shows up as deflections, and the positive (upward) deflections within that complex are called R waves. The first upright peak after the P wave is the R wave, and if there’s another upright peak within the same QRS, that second one is labeled R prime (R′). Q waves are the small initial negative deflections, S is the downward deflection after the R, and T is the ventricular repolarization wave. So the question’s focus on all positive deflections within the QRS points to the R waves, with a possible second one named R prime if present.