CGRN Electrosurgery and Procedural Patient Safety

Question 1

Where should the return electrode (grounding pad) be placed for monopolar electrosurgery?

Accepted Answer

On clean, dry skin over a well-vascularized muscle mass, away from metal implants

Answer

Well-vascularized muscle spreads current safely and lowers the risk of burns at the pad site. Bony prominences, scar tissue, hairy or wet skin, and areas over metal implants or cardiac devices should be avoided.

Question 2

What is a key advantage of bipolar electrosurgery over monopolar electrosurgery?

Accepted Answer

Current flows only between two electrodes at the device tip, so no return pad is needed

Answer

In bipolar devices, current passes only between two electrodes at the tip. It does not travel through the patient's body to a dispersive pad. This lowers the risk of stray-current injury and of interference with implanted devices.

Question 3

Before polypectomy with electrocautery, a patient reports having an implantable cardioverter-defibrillator (ICD). What is the most appropriate nursing action?

Accepted Answer

Tell the physician; arrange device management per cardiology/protocol and have a defibrillator available

Answer

Electrosurgical current can be sensed as a dangerous heart rhythm and trigger inappropriate shocks, or it can interfere with pacing. The ICD may need to be temporarily deactivated, for example with a magnet or reprogramming. The patient needs cardiac monitoring and an external defibrillator ready.

Question 4

What is the main reason CO2 insufflation is preferred over room air during colonoscopy?

Accepted Answer

CO2 is absorbed quickly, so there is less bloating and pain after the procedure

Answer

CO2 is absorbed through the bowel wall and breathed out about 150 times faster than air. This reduces bloating and pain after the procedure and lowers the risk of gas embolism.

Question 5

Why is a colon prepped with mannitol, or poorly prepped, dangerous when argon plasma coagulation (APC) or electrocautery is used?

Accepted Answer

Colonic gases such as hydrogen and methane can build up and ignite, causing a colonic explosion

Answer

Bacteria ferment mannitol and residual stool, producing flammable hydrogen and methane. Electrosurgical energy can ignite these gases. Adequate non-fermentable bowel prep and gas exchange lower the risk.

CGRN - Certified Gastroenterology Registered Nurse Practice Test

CGRN - Certified Gastroenterology Registered Nurse Practice Test

CGRN Electrosurgery and Procedural Patient Safety