SGNA Equipment and Technology

Question 1

What does the term 'white balancing' refer to in GI endoscopy?

Accepted Answer

Calibrating the endoscope's color output against a white reference

Answer

White balancing (white balance calibration) adjusts the video processor to display accurate colors by referencing a white surface, ensuring true tissue color representation.

Question 2

What is the primary advantage of high-definition (HD) endoscopy over standard-definition scopes?

Accepted Answer

Superior mucosal detail and earlier detection of subtle lesions

Answer

HD endoscopy provides significantly higher pixel density (1080i or higher), enabling detection of subtle mucosal changes, flat polyps, and early neoplasia missed with standard-definition.

Question 3

During colonoscopy, the nurse notices the patient's abdomen is becoming distended and rigid. This most likely indicates:

Accepted Answer

Perforation

Answer

Sudden abdominal distension with rigidity during colonoscopy is a warning sign of perforation and requires immediate procedure termination and emergency evaluation.

Question 4

What is the function of the biopsy channel in a flexible endoscope?

Accepted Answer

Allows passage of accessories (forceps, snares, needles) and specimen retrieval

Answer

The working channel (biopsy channel) accommodates endoscopic accessories like biopsy forceps, snares, hemostatic clips, and allows aspiration of fluid.

Question 5

CO2 insufflation is preferred over air insufflation during colonoscopy primarily because:

Accepted Answer

CO2 is rapidly absorbed by intestinal mucosa, reducing post-procedure bloating

Answer

CO2 is absorbed by intestinal mucosa approximately 160 times faster than room air, dramatically reducing abdominal pain, cramping, and bloating after colonoscopy.

SGNA - Society of Gastroenterology Nurses and Associates Practice Test

SGNA - Society of Gastroenterology Nurses and Associates Practice Test

SGNA Equipment and Technology