Certified Gastroenterology RN Endoscopic Procedures and Equipment Questions and Answers — Questions and Answers
Question 1: During the reprocessing of a flexible colonoscope, which of the following steps is MOST critical to perform immediately after pre-cleaning and before manual submersion cleaning?
- Soaking the scope in a high-level disinfectant.
- Drying all channels with compressed air.
- Performing a pressure leak test. (Correct answer)
- Manually brushing the biopsy channel.
Correct answer: Performing a pressure leak test.
Performing a pressure leak test is a critical safety step that must be done after pre-cleaning but before the endoscope is submerged for manual cleaning. [13] This test pressurizes the internal channels to detect any breaks or holes in the scope's sheath. [13] If a leak is present, submerging the scope would allow fluid to invade the internal components, leading to catastrophic and expensive damage. [13]
Question 2: A patient is undergoing an Endoscopic Retrograde Cholangiopancreatography (ERCP). The gastroenterology nurse knows that the MOST common complication associated with this procedure is:
- Cholangitis
- Hemorrhage
- Pancreatitis (Correct answer)
- Perforation
Correct answer: Pancreatitis
Post-ERCP pancreatitis (PEP) is the most common complication of this procedure. [10, 15] It is believed to be caused by factors such as mechanical irritation of the pancreatic duct, pressure from contrast injection, or thermal injury during sphincterotomy. While cholangitis, hemorrhage, and perforation are also potential risks, pancreatitis occurs most frequently. [2, 14]
Question 3: During a colonoscopy with polypectomy using a monopolar snare, the nurse correctly places the dispersive electrode (grounding pad) on the patient. Which site represents the MOST appropriate placement?
- On the patient's scapula, avoiding the bony prominence.
- On the patient's upper arm, near an implanted cardiac defibrillator.
- Over an old, well-healed abdominal surgical scar.
- On the patient's thigh, ensuring a large, well-vascularized muscle mass. (Correct answer)
Correct answer: On the patient's thigh, ensuring a large, well-vascularized muscle mass.
The dispersive electrode, or grounding pad, should be placed on a large, clean, dry, well-vascularized muscle mass close to the operative site, such as the thigh. [26, 32] This provides a safe, low-resistance path for the electrical current to exit the body. Placement over bony prominences, scar tissue, or near implanted electronic devices should be avoided as it can increase impedance and the risk of patient burns. [26, 32, 34]
Question 4: Argon Plasma Coagulation (APC) is a non-contact thermal modality used for hemostasis in the GI tract. What is the primary mechanism of action for APC?
- It deploys a mechanical clip to ligate the bleeding vessel.
- It delivers a high-frequency electrical current to tissue via ionized argon gas. (Correct answer)
- It uses a focused laser beam to vaporize superficial tissue.
- It injects a sclerosing agent to harden the vessel walls.
Correct answer: It delivers a high-frequency electrical current to tissue via ionized argon gas.
APC works by directing a jet of argon gas toward the target tissue. A high-frequency electrical current then ionizes the gas, creating a plasma that conducts the current to the tissue without direct contact. [16, 25] This results in superficial coagulation and is effective for controlling bleeding from various lesions. [22, 25]
Question 5: A 50-year-old patient presents with chronic, occult iron deficiency anemia. An EGD and a full colonoscopy were both performed and revealed no source of bleeding. Which procedure should the nurse anticipate as the MOST appropriate next diagnostic step?
- Endoscopic Ultrasound (EUS)
- Flexible Sigmoidoscopy
- Video Capsule Endoscopy (VCE) (Correct answer)
- Endoscopic Retrograde Cholangiopancreatography (ERCP)
Correct answer: Video Capsule Endoscopy (VCE)
When upper and lower endoscopies are negative in a patient with suspected GI bleeding, the most likely source is the small bowel. Video Capsule Endoscopy (VCE) is the primary non-invasive procedure indicated to visualize the entire small bowel to identify the source of obscure GI bleeding. [1, 11, 12]
Question 6: Duodenoscopes have been linked to a higher risk of transmitting multidrug-resistant organisms compared to standard gastroscopes or colonoscopes. This increased risk is primarily attributed to which specific design feature?
- The larger diameter of the suction channel.
- The longer overall length of the insertion tube.
- The complex, fixed elevator mechanism at the distal tip. (Correct answer)
- The increased flexibility of the bending section.
Correct answer: The complex, fixed elevator mechanism at the distal tip.
The complex design of the elevator mechanism at the distal tip of a duodenoscope is the primary reason for increased infection transmission risk. [6, 18, 27] This mechanism contains small crevices that are difficult to access and clean thoroughly, which can harbor bacteria and lead to the formation of biofilms, even after standard reprocessing. [6, 18]
Certified Gastroenterology RN Endoscopic Procedures and Equipment Questions and Answers
During the reprocessing of a flexible colonoscope, which of the following steps is MOST critical to perform immediately after pre-cleaning and before manual submersion cleaning?