Confirm that an adequate supply of disposable defibrillation electrodes ( or reusable paddles ), ECG electrodes, pacing electrodes, or combination defibrillation/pacing electrodes ( if applicable) are present and that they are within their expiration dates. Confirm that special paddles or electrodes (e.g, pediatric, internal) are available, if appropriate. If paddles are used,examine all paddles for physical condition and cleanliness. Alert clinical personnel responsible for the instrument to the presence of dried electrode gel, physiologic fluids, or debris on the paddle surface or handles. Dirty electrodes prevent good electrical contact and can cause burns. Electrode gel or other debris on the insulating portion of the paddle can cause operator shocks. Clean the paddles, if needed, including the electrode surface and handle seams, and make sure that that they are completely dry before proceeding with any further testing.