Preventing Electrosurgical Burns in the Operating Room

How high-frequency current can burn

Electrosurgery works by concentrating current at a small active electrode so that tissue heats rapidly. The same current must then return to the generator through a much larger area, normally a return electrode (neutral pad), so that heating at the return site stays negligible. A burn occurs when current is concentrated somewhere it was not intended: under a pad whose effective contact area has shrunk, at a point of skin contact with grounded metal, or where insulation has failed.

Understanding this simple principle explains most prevention measures. Large, well-adhered pads spread the current; insulation keeps it inside the instrument; and a generator that watches the return path warns when it is compromised.

Pad-site burns

Pad-site burns arise when part of the return electrode lifts, wrinkles or dries out, so the same current passes through a smaller area. Typical causes are placing the pad over scar tissue, bony prominences, hair or a wet or oily skin surface, reusing single-use pads, using pads past their expiry date or with dried gel, and repositioning the patient after the pad was applied.

Good practice is to place the pad on clean, dry, well-vascularised muscular skin close to the operative site, with its long edge toward the site, and to re-check it after any patient movement. Our article on the neutral electrode and return pads covers pad choice and placement in more detail.

• Remove or clip hair; clean and dry the skin
• Avoid scars, implants, bony prominences and tattoos where practical
• Use new single-use pads within their expiry date
• Keep metal jewellery and monitoring leads away from the pad

Alternate-site burns

Alternate-site burns occur when current leaves the patient through an unintended contact, such as an ECG electrode, a limb touching a metal table support or a wet drape. They are typically small and can be easily overlooked, appearing hours later at a point far from the surgical field.

Prevent them by keeping the patient insulated from earthed metal with dry padding, avoiding pooled prep solution or irrigation under the patient, keeping skin-to-skin contact points dry and using monitoring electrodes placed away from the current path. A contact-monitoring return system helps because it fails safe if the pad itself is compromised, but cannot sense every other path.

Instrument, cable and technique-related burns

Damaged insulation on electrodes, laparoscopic instruments or cables can leak current to adjacent tissue outside the surgeon's view. Inspect reusable instruments at each reprocessing cycle, replace cracked cables and never coil active cables around metal clamps. Keep the active electrode in its holster when not in use, and use the lowest power and shortest activation that achieves the effect.

Other hazards are alcohol-based preps that have not dried, oxygen-enriched atmospheres and open-circuit activation. Always allow preps to dry, minimise oxygen near the field during head and neck work, and verify settings before activating. In laparoscopy, our summary of electrosurgery safety in laparoscopy describes capacitive coupling and direct coupling risks.

Generator features that support prevention

Modern generators contribute through neutral-electrode monitoring, arc control and continuous self-testing. For example, the BOWA ARC 350 lists EASY neutral-electrode monitoring with a baby mode, and the ARC 400 recognises compatible instruments and preselects settings, which lowers the risk of selecting the wrong parameters. See also how return electrode monitoring works.

Prevention checklist and CTA

Before every case: inspect the pad and its packaging, prepare the skin, apply and confirm the alarm is clear, check cables and instruments, dry preps, and set the lowest effective power. After the case: remove the pad slowly, inspect the skin and document findings. Report any burn through your facility's incident process and consider preventive maintenance of the generator; Beckfinity can arrange maintenance and performance checks. Contact our specialists for a consultation.