1. DEFINE: ● QRS Complex: It's the main spike seen on an ECG line. The series of deflections in an electrocardiogram that represent electrical activity generated by ventricular depolarization prior to contraction of the ventricles — compare P wave, T wave. ● Synchronized Cardioversion: LOW ENERGY SHOCK that uses a sensor to deliver electricity that is synchronized with the peak of the QRS complex (the highest point of the R-wave). When the “sync” option is engaged on a defibrillator ...