Portable monitor- defibrillators used on crash carts generally use three leads which are placed in the same configuration as the 5 lead system; smoke over fire and white to the right; The brown and green leads are absent.
Defibrillator-pacing pads are often used in place of the 3 lead system to sense an ECG rhythm.
Defibrillator pads are sometimes called "multifunction electrodes" or MFEs because they can sense an ECG rhythm, deliver pacing spikes from the defibrillator to pace the heart and deliver a shock to the heart.