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Chapter 7. Power Sources in Surgery

All of the following are true about electrosurgery except:

A. In monopolar electrosurgery, the current flows through the patient from the active electrode to the return electrode.

B. In bipolar electrosurgery, the current flows from the handpiece to the return electrode.

C. The cutting mode of monopolar electrosurgery utilizes a continuous sine wave of current.

D. The coagulation mode of monopolar electrosurgery relies on spikes of electric wave activity.

The correct answer is B. In bipolar electrosurgery, the current flows from the handpiece to the return electrode

A bipolar surgical instrument differs from a monopolar instrument in:

A. The source of energy.

B. The number of applications permitted in an operation.

C. The length of the path between the two poles in the circuit.

D. The number of poles in the circuit.

The correct answer is C. The length of the path between the two poles in the circuit

Which is true regarding electrosurgery and fire in the operating room?

A. Fire is preventable by keeping the oxygen levels used for ventilation low.

B. Fire depends upon the presence of an oxygen source, an ignition source, and fuel.

C. Alcohol from skin prep solutions is not flammable.

D. Fire cannot be caused by electrosurgical instruments.

The correct answer is B. Fire depends upon the presence of an oxygen source, an ignition source and fuel

Which is not an important safety factor in electrosurgery?

A. Return electrodes have a wide surface, dispersing the density of charge.

B. Low voltage prevents serious electrical injury.

C. Muscle and nerve stimulation ceases at 100 kHz.

D. Return electrodes include a separate “safety circuit,” assuring complete contact over a wide area.

The correct answer is C. Muscle and nerve stimulation ceases at 100 kHz

Radiofrequency ablation:

A. Causes tissue destruction by heating tissues to 500°C.

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