VABC Vascular Access Devices & Technologies 4 — Questions and Answers
Question 1: Which ultrasound probe orientation is used for longitudinal (in-plane) visualization during peripheral IV catheter insertion?
- Probe marker pointed toward patient's head with beam perpendicular to the vessel
- Probe rotated 90 degrees so the vessel appears as a long tubular structure (Correct answer)
- Probe angled at 45 degrees to the skin surface
- Probe marker pointed toward patient's feet
Correct answer: Probe rotated 90 degrees so the vessel appears as a long tubular structure
Longitudinal (long-axis, in-plane) technique rotates the probe so the vessel is visualized along its length, allowing real-time tracking of the needle within the vessel.
Question 2: ECG-guided PICC tip confirmation works by detecting which cardiac electrical signal at the catheter tip?
- Prominent R wave when the tip enters the SVC
- Maximally tall P wave when the tip approaches the sinoatrial node near the SVC-RA junction (Correct answer)
- ST-segment elevation indicating tip contact with the myocardium
- QRS widening indicating deep catheter advancement
Correct answer: Maximally tall P wave when the tip approaches the sinoatrial node near the SVC-RA junction
As the guidewire or catheter tip approaches the SVC-right atrium junction near the SA node, the intracavitary P wave amplitude maximizes, confirming optimal tip position.
Question 3: MAGIC criteria are used to determine the most appropriate vascular access device based on:
- Patient age and weight only
- Infusion characteristics, duration, patient condition, and available vessels (Correct answer)
- Insurance coverage and device cost
- Nurse preference and institutional protocol only
Correct answer: Infusion characteristics, duration, patient condition, and available vessels
MAGIC (Michigan Appropriateness Guide for Intravenous Catheters) provides evidence-based criteria matching device selection to therapy duration, medication characteristics, and patient factors.
Question 4: A peripherally inserted central catheter (PICC) is confirmed to be in the correct position when the tip is located at:
- Right ventricle
- Subclavian vein
- Cavoatrial junction (lower third of SVC to right atrial junction) (Correct answer)
- Internal jugular vein
Correct answer: Cavoatrial junction (lower third of SVC to right atrial junction)
The cavoatrial junction provides optimal hemodilution of infusates, reduces thrombosis risk, and is the target tip position per INS and AVA guidelines.
Question 5: Which technology uses fluoroscopy in real-time to confirm catheter tip position during PICC insertion?
- Electrocardiographic (ECG) tip confirmation
- Magnetic navigation tip confirmation
- Fluoroscopic guidance with contrast injection (Correct answer)
- Near-infrared vein visualization
Correct answer: Fluoroscopic guidance with contrast injection
Fluoroscopy combined with contrast injection directly visualizes the catheter tip position in relation to cardiac anatomy, serving as the gold standard for tip confirmation.
Question 6: A chlorhexidine-impregnated sponge dressing (e.g., Biopatch) placed at the catheter insertion site primarily reduces:
- Mechanical phlebitis at the insertion site
- Catheter-related bloodstream infection by inhibiting microbial colonization at the skin exit site (Correct answer)
- Catheter migration and dislodgement
- Thrombosis at the catheter tip
Correct answer: Catheter-related bloodstream infection by inhibiting microbial colonization at the skin exit site
Chlorhexidine-impregnated sponge dressings provide sustained antimicrobial activity at the skin-catheter interface, reducing CRBSI rates in high-risk patients.
Question 7: Which catheter material is preferred for patients with known latex allergies?
- Natural rubber latex catheter
- Silicone or polyurethane catheter (Correct answer)
- PVC catheter with latex ports
- Neoprene catheter
Correct answer: Silicone or polyurethane catheter
Silicone and polyurethane are latex-free materials used in all modern vascular access catheters, making them safe for latex-allergic patients.
VABC Vascular Access Devices & Technologies 4
Which ultrasound probe orientation is used for longitudinal (in-plane) visualization during peripheral IV catheter insertion?