III Lecture Chapter Six Short Answer: Electricity pp 56

define radiofrequency (RF) capacitive coupling and dielectric breakdown. how can it be prevented

RF capacitive coupling occurs when an alternating current travels from the electrode, through intact insulation, and into the skin. place the tip of the ESU pencil below of the fingers of the individual holding the hemostat

when using an argon-enhanced electrosurgical unit, what is the purpose of the argon gas

argon gas enhances the effectiveness of the electrosurgical current. argon is more conducive than air, is noncombustible, and heavier than air, causing less tissue damage

discuss at least five patient safety precautions for for ESU usage

cold wrinkling or gaping large fleshy area that is clean and dry uneven placement must be in a visible location not over a metal prosthesis handle as little as possible full contact with skin check expiration date check gel is wet do not move or reuse avoid pooling of skin prep beware of flammable anesthetics beware electrocardiogram electrodes avoid use with pacemaker/internal defibrillators remove patient jewelry and metal objects

what is the term used to describe the visual display of symbols on the toolbars for functions within programs, surfing the internet, or shortcuts to available programs from the desktop

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compare monopolar and bipolar currents. what are the major differences

monopolar mode is more commonly used, can both cut and coagulate, and requires a grounding pad. bipolar mode is used only for coagulation, for delicate surgical procedures, at sites where moisture is nearby, to prevent damage to delicate nerves and tissues, or in patients with implanted devices such as a pacemaker which might be affected by monopolar current.