When setting up equipment for surgery, surgical tech passed of electrical surgical unit (esu) pencil.Nurse plugged into esu machine #1401628 that was set to 30/30/30.When the nurse plugged in the pencil, she heard a noise that signaled the machine was being activated.She immediately unplugged and plugged it into the next slot, and it continued to be activated.At this point the surgical tech was holding the pencil in her hand and stating that the pencil was firing without being depressed and asked if the pedal was being pressed accidently.The nurse unplugged it and checked to see if the pedal had something on it to cause it to fire.The pedal was free and clear and there was nothing on it to cause it to fire.The esu was at that point unplugged and removed from the room and a new esu machine was brought in, a new esu grounding pad was applied to a different site and a new esu pencil was placed on the field.At this point the surgical tech noticed that there was an approximate ½ inch mark noted to the upper inner area of the calf that was not there prior to this occurrence.
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