Mixed Deck — All RVT Topics Flashcards

The time-gain compensation (TGC) control is used primarily to:

Answer: Compensate for attenuation of sound with depth

TGC amplifies returning echoes from deeper structures to compensate for the progressive attenuation of ultrasound as it travels through tissue.

Which statement about ethics violations and RVT credential status is accurate?

Answer: ARDMS may investigate and revoke credentials for documented ethical violations

ARDMS has a Code of Ethics and can investigate complaints, and may suspend or revoke credentials for substantiated violations.

Which parameter is used to calculate volume flow rate (mL/min) when performing duplex assessment of a dialysis access?

Answer: Time-averaged mean velocity and vessel cross-sectional area

Volume flow = time-averaged mean velocity (TAMV) × cross-sectional area (πr²) × 60, providing flow in mL/min.

In aortic dissection, which ultrasound finding distinguishes the true lumen from the false lumen?

Answer: The false lumen is typically larger with slower flow and may contain spontaneous echo contrast or thrombus

The false lumen is often larger, has lower velocity swirling flow, may show spontaneous echo contrast (smoke), and may be partially thrombosed.

Which statement CORRECTLY describes the relationship between ankle-brachial index (ABI) values and cardiovascular risk?

Answer: Both low ABI (1.3) are independently associated with increased cardiovascular mortality

Both low ABI (reflecting atherosclerosis) and high ABI (reflecting arterial stiffness from calcification) are independently associated with increased cardiovascular morbidity and mortality.

The SVU's annual symposium is commonly used by RVTs for CME because it typically offers:

Answer: ARDMS-approved accredited sessions covering current vascular topics

SVU's symposium provides ARDMS-approved accredited educational content directly relevant to vascular technology practice.

When a vascular laboratory experiences a near-miss event (an error that was caught before reaching the patient), the BEST institutional response is to:

Answer: Document the event confidentially, analyze contributing factors, and implement process improvements

Near-miss events are high-value learning opportunities; confidential reporting combined with systems-based root cause analysis and process improvement is the gold standard in patient safety science.

The posterior inferior cerebellar artery (PICA) most commonly originates from the:

Answer: Vertebral artery

PICA typically arises from the distal intracranial vertebral artery, and its occlusion causes the lateral medullary (Wallenberg) syndrome.

A 45-year-old woman with varicose veins has duplex showing reflux at the saphenofemoral junction. Which additional vein should be systematically evaluated for a source of reflux?

Answer: Saphenopopliteal junction and small saphenous vein

The saphenopopliteal junction and small saphenous vein are a second major potential source of saphenous reflux and must be assessed.

Which AIUM/NEMA safety index estimates the likelihood of cavitation in tissue?

Answer: Mechanical index (MI)

The Mechanical Index (MI = peak negative pressure / √frequency) estimates the potential for cavitation, with values above 0.3 suggesting increased risk.

Which finding on abdominal aortic duplex indicates a hemodynamically significant aortic aneurysm requiring surgical consultation?

Answer: Aortic diameter ≥ 5.5 cm or rapid growth > 0.5 cm in 6 months

An abdominal aortic aneurysm ≥ 5.5 cm diameter or growing > 0.5 cm in 6 months meets the threshold for surgical or endovascular repair consultation.

Which parameter obtained during peripheral arterial physiologic testing BEST predicts primary amputation healing at the below-knee level?

Answer: Below-knee or ankle systolic pressure >70 mmHg or toe pressure >30 mmHg

Below-knee amputation healing is most reliably predicted by adequate perfusion pressure, with ankle or BK pressures >70 mmHg and toe pressures >30 mmHg associated with successful primary healing.

While performing a spectral Doppler evaluation, a sonographer encounters aliasing. Which of the following adjustments is LEAST effective for correcting this artifact?

Answer: Increasing the overall Doppler gain.

Aliasing occurs when the Doppler shift exceeds the Nyquist limit. Increasing the PRF (scale), shifting the baseline, and using a lower frequency transducer are all effective methods to correct for or reduce aliasing. Increasing the Doppler gain only amplifies the entire signal, including the artifact, and does not change the parameters that cause aliasing.

How does earning the Registered Vascular Specialist (RVS) credential from Cardiovascular Credentialing International (CCI) relate to ARDMS RVT maintenance?

Answer: RVS and RVT are maintained separately with independent CME requirements

RVS and RVT are separate credentials from different organizations, each with its own independent CME and renewal requirements.

What is required to maintain RVT certification?

Answer: Completing CME credits

To maintain RVT certification, registered vascular technologists must complete Continuing Medical Education (CME) credits. This requirement ensures that professionals stay current with the latest advancements, techniques, and best practices in vascular technology. It demonstrates a commitment to lifelong learning and helps maintain high standards of patient care.

A sonographer measures a peak systolic velocity in the common carotid artery and notes that the Doppler angle of insonation is 75 degrees. What is the most likely consequence of using this angle for the velocity measurement?

Answer: The velocity will be significantly underestimated.

The Doppler equation uses the cosine of the angle between the ultrasound beam and the direction of blood flow to calculate velocity. As this angle increases towards 90 degrees, its cosine value decreases sharply. Angles above 60 degrees introduce a large potential for error, leading to a significant underestimation of the true velocity.

In a vascular laboratory, the purpose of a written infection control exposure control plan (ECP) is to:

Answer: Minimize employee exposure to bloodborne pathogens through engineering and work practice controls

Per OSHA 29 CFR 1910.1030, the ECP must describe the means by which the employer will minimize or eliminate employee exposure to blood and other potentially infectious materials.

What is the primary advantage of pulse volume recordings (PVR) over segmental limb pressures in patients with calcified vessels?

Answer: PVR assesses volume changes rather than compressibility, making it reliable despite vessel calcification

PVR measures limb volume changes with each cardiac cycle using air plethysmography, which is not affected by vessel wall stiffness or calcification, unlike pressure-based measurements.

Which relationship best describes how ultrasound frequency affects axial resolution?

Answer: Higher frequency produces shorter wavelengths and better axial resolution

Higher frequency transducers produce shorter wavelengths, which improves axial resolution (ability to distinguish two structures along the beam axis), though at the cost of tissue penetration.

Which parameter is most useful for evaluating calf vein thrombosis on duplex ultrasound when direct visualization is difficult?

Answer: Color Doppler filling defects and compressibility at each vein segment

Systematic color Doppler assessment for flow filling defects combined with compressibility testing at each tibial vein segment is the standard approach.