1 reasonable selection of negative plate, should be placed in the parts of the muscle vascular rich, flat and near the area of operation and easy to observe, such as the hips, thighs, calves, do not place in hair, fat and scar, apophyseal provenance, avoid compression, away from the ECG electrodes.  
2, negative plates remain flat, many area of 64.5 square centimeters, forbid cutting and folding,