SGNA Equipment and Technology 1 — Questions and Answers
Question 1: What does the term 'white balancing' refer to in GI endoscopy?
- Calibrating the endoscope's color output against a white reference (Correct answer)
- Cleaning the scope with bleach
- Testing water pressure in irrigation channels
- Verifying light source function
Correct answer: Calibrating the endoscope's color output against a white reference
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?
- Superior mucosal detail and earlier detection of subtle lesions (Correct answer)
- Lower cost
- Faster procedure times
- Simpler reprocessing
Correct answer: Superior mucosal detail and earlier detection of subtle lesions
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:
- Perforation (Correct answer)
- Normal bowel preparation effects
- Sedation side effect
- Polyp removal site bleeding
Correct answer: Perforation
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?
- Allows passage of accessories (forceps, snares, needles) and specimen retrieval (Correct answer)
- Provides water irrigation only
- Contains the fiber optic light bundle
- Houses the air/CO2 insufflation tube
Correct answer: Allows passage of accessories (forceps, snares, needles) and specimen retrieval
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:
- CO2 is rapidly absorbed by intestinal mucosa, reducing post-procedure bloating (Correct answer)
- CO2 improves visualization more than air
- CO2 is less expensive than air
- CO2 prevents perforation
Correct answer: CO2 is rapidly absorbed by intestinal mucosa, reducing post-procedure bloating
CO2 is absorbed by intestinal mucosa approximately 160 times faster than room air, dramatically reducing abdominal pain, cramping, and bloating after colonoscopy.
Question 6: What is the purpose of fluoroscopy during ERCP procedures?
- Real-time X-ray visualization of biliary and pancreatic ductal anatomy and contrast filling (Correct answer)
- Measuring bile acid levels
- Assessing gastric motility
- Monitoring patient's heart rate
Correct answer: Real-time X-ray visualization of biliary and pancreatic ductal anatomy and contrast filling
Fluoroscopy provides real-time X-ray imaging during ERCP to visualize contrast injection into bile and pancreatic ducts, guiding cannulation, stone detection, and stent placement.
SGNA Equipment and Technology 1
What does the term 'white balancing' refer to in GI endoscopy?