When applying ECG electrodes, what is the recommended sequence regarding wires and electrodes placement?

• A. Place the electrodes on the chest first, then connect the lead wires.
• B. Connect the lead wires after removing the electrodes.
• C. Connect the electrodes to the lead wires prior to placing them on the chest.
• D. Secure electrodes with firm pressure.

Answer: (C)

The key idea is to set up the connections in a way that keeps the electrode contact stable and reduces disturbances during placement. Connecting the electrodes to the lead wires before placing them on the chest is the best approach because it keeps the wiring organized and prevents tugging on the pads as you position them. If the wires are attached after the pads are on the skin, movement or repositioning can dislodge or misalign the electrodes and create poor contact or motion artifacts. By attaching the leads to the electrode assemblies first, you can verify the connections and then place the ready-to-use pads on clean, dry skin and press firmly to secure them. After placement, check that all leads remain connected and that the electrodes stay in good contact.