What is the function of the electro-surgical unit (ESU) in a procedure and key safety considerations?

• A. The ESU sterilizes instruments
• B. The ESU cuts and coagulates tissue; ensure proper grounding, avoid conductive materials on the field, use bipolar mode when possible, and monitor the patient
• C. The ESU administers anesthesia
• D. The ESU irrigates and suctions

Answer: (B)

The ESU uses electrical energy to heat tissue, enabling cutting or coagulating vessels to control bleeding. The safety framework centers on controlling where that current travels and how the patient is protected. In monopolar use, current goes from the active electrode through the patient to a grounding pad; this means proper grounding, good pad contact, and correct pad size are essential to prevent burns. Avoid conductive materials on the field—jewelry, IV lines with metal components, or any other stray conductors can divert current and cause unintended injury. When possible, use bipolar mode, which confines the current to the tissue between the two tips of the instrument, reducing exposure to surrounding tissues and implants. Throughout the procedure, monitor the patient closely for signs of heating or burns, ensure the grounding pad remains in good contact, check that ESU settings match the tissue type, and be aware of any interference with monitoring devices. Also consider smoke safety and use suction to minimize exposure to surgical plume. In short, the ESU cuts and coagulates, with safety hinging on proper grounding, avoiding conductive field materials, preferring bipolar mode when feasible, and vigilant patient monitoring.