VA-BC Ultrasound Guidance 5 — Questions and Answers
Question 1: A nurse documents that a patient's basilic vein has 'posterior acoustic enhancement' on ultrasound. This artifact indicates:
- The vein contains thrombus
- The vein is fluid-filled and patent (Correct answer)
- The vein wall is calcified
- The vein is too deep to cannulate
Correct answer: The vein is fluid-filled and patent
Posterior acoustic enhancement is a classic artifact seen deep to fluid-filled structures like patent vessels, where sound passes through fluid with less attenuation, brightening the tissue behind.
Question 2: When scanning for a target vein in a pediatric patient, which ultrasound probe type is preferred due to its small footprint?
- Curved array (convex) probe
- Phased array probe
- Linear high-frequency probe
- Hockey-stick (micro-linear) probe (Correct answer)
Correct answer: Hockey-stick (micro-linear) probe
The hockey-stick (micro-linear) probe has a very small footprint ideal for pediatric patients and small scanning areas while maintaining high-frequency resolution.
Question 3: During an ultrasound-guided vascular access procedure, the nurse aspirates bright red, pulsatile blood. The immediate next step is:
- Advance the guidewire immediately to secure access
- Apply firm sustained pressure for at least 5 minutes and reassess (Correct answer)
- Inject 10 mL of normal saline to confirm placement
- Attach the catheter and obtain a chest X-ray
Correct answer: Apply firm sustained pressure for at least 5 minutes and reassess
Bright red pulsatile blood indicates inadvertent arterial puncture; the needle should be removed immediately and sustained pressure applied for at least 5 minutes to achieve hemostasis.
Question 4: Which ultrasound maneuver helps differentiate a thrombosed vein from a lymph node during upper extremity vascular assessment?
- Apply color Doppler to detect internal blood flow (Correct answer)
- Increase probe frequency to maximum
- Apply probe pressure to assess compressibility
- Rotate probe 90 degrees to long-axis view
Correct answer: Apply color Doppler to detect internal blood flow
Color Doppler can demonstrate internal blood flow within a vessel (even thrombosed portions may show flow), while lymph nodes typically show no central blood flow or only peripheral hilar flow.
Question 5: A PICC nurse uses ultrasound to assess a patient's median cubital vein at the antecubital fossa. This vessel is generally NOT preferred for PICC insertion because:
- It is too superficial for ultrasound visualization
- It is too short and merges near the elbow joint, increasing dwell complications (Correct answer)
- It is always thrombosed in adult patients
- It lies adjacent to the ulnar nerve
Correct answer: It is too short and merges near the elbow joint, increasing dwell complications
The median cubital vein is short, superficial, and located over the elbow joint, making it prone to catheter kinking, dislodgement, and mechanical phlebitis with arm movement.
Question 6: According to the INS and AVA guidelines, ultrasound guidance for peripheral IV insertion is considered the standard of care in which patient population?
- All adult patients regardless of vessel visibility
- Patients with a history of difficult access or two failed conventional attempts (Correct answer)
- Only patients with chronic kidney disease
- Patients requiring vasopressor infusions exclusively
Correct answer: Patients with a history of difficult access or two failed conventional attempts
INS and AVA guidelines recommend ultrasound guidance for patients with difficult vascular access (DIVA) or after two failed conventional cannulation attempts.
Question 7: When storing the ultrasound machine after a vascular access procedure, which step is essential to prevent probe damage and maintain equipment longevity?
- Store the probe submerged in disinfectant solution
- Clean the probe with an approved low-level disinfectant wipe and hang vertically (Correct answer)
- Cap the probe connector and coil the cable tightly
- Leave coupling gel on the probe surface to preserve the transducer
Correct answer: Clean the probe with an approved low-level disinfectant wipe and hang vertically
Probes should be cleaned with manufacturer-approved disinfectant wipes and stored hanging vertically or in a protective cradle to prevent cable damage and crystal misalignment.
VA-BC Ultrasound Guidance 5
A nurse documents that a patient's basilic vein has 'posterior acoustic enhancement' on ultrasound.
This artifact indicates: