High frequency current distribution in axial body structures during electrosurgery

High-frequency current distribution was investigated while performing a simulated electrosurgical procedure (transurethral resection/TUR) in a canine model utilizing a function generator, spectrum analyzer, and current probes to measure current. Contour plots from recordings on integument muscle, nerve, vein, and artery tissue at sequential axial sites revealed current totals of 45% in artery, 24% in vein, 13% both in skin and muscle, and 5% in nerve. The investigations reveal that, during endoscopic (TUR) and other electrosurgical procedures, anatomic structures such as great vessels may act as preferential high-frequency current conduits and could potentially facilitate serious sequelae, such as obturator nerve-muscle spasm, electrical burns, or even cardiac arrythmias (at higher power levels)