Optimization of thermocautery in excisional dermatologic surgery.
OBJECTIVE
Electrosurgery is routinely used in cutaneous surgery for hemostasis. Thermocautery can be used in patients with implantable cardiac devices. This technique relies on heat without electrical current passing through the patient to produce hemostasis. The temperatures and utility of a commercially available, adjustable thermocautery unit are examined.


METHODS
Tip temperature of the commercially available thermocautery unit was measured in air and tissue via a type E thermocouple (0.002 in. diameter) around the unit's tip. Time intervals of 20 to 30 seconds were recorded at device settings 1 to 9 in air and 3 to 8 on surgical patients (Institutional Review Board approval obtained).


RESULTS
In vitro analysis demonstrated predictable temperatures at increasing settings in air: 350 to 900 degrees C. Analysis in vivo during surgery demonstrated similar findings. Tissue contact decreased tip temperature by approximately 50% from in vitro values, and use in a bloody field caused a further decrease in the tip temperature.


CONCLUSIONS
The thermocautery unit examined is an effective and safe unit to achieve hemostasis. In addition, the temperature may be adjusted as opposed to hand-held units that operate at in vitro temperatures exceeding 1,400 degrees F. Hemostasis at approximately 100 to 400 degrees C provided optimal hemostasis.
Lane
Joshua E
JE
Division of Dermatology, Department of Internal Medicine, Mercer University School of Medicine, Macon, Georgia 31217, USA.
O'brien
Edward M
EM
Kent
David E
DE
D000293:Adolescent; D000328:Adult; D000368:Aged; D000369:Aged, 80 and over; D017147:Defibrillators, Implantable; D004564:Electrocoagulation / Q000295:instrumentation*; D004867:Equipment Design; D005260:Female; D006488:Hemostasis, Surgical / Q000295:instrumentation*; D006801:Humans; D008297:Male; D008875:Middle Aged; D010865:Pilot Projects; D012871:Skin Diseases / Q000601:surgery*