Probe Selection and Manipulation — MCQs

Ultrasound is the best initial investigation of choice for:

What is the primary advantage of using sector scanning in neonates?

Which imaging modality is most sensitive for detecting early ischemic stroke?

Acoustic shadow is produced by the following except

In a patient with a metallic foreign body in the eye, which investigation should NOT be done?

Depth of Anesthesia is best measured by:

Best advantage of doing transcranial Doppler ultrasound?

During ultrasound-guided internal jugular vein cannulation, you observe the vein collapsing with minimal probe pressure while the artery remains patent. The vein appears enlarged and the artery-to-vein ratio is 1:3. A spontaneously breathing patient shows respiratory variation. Evaluate the most appropriate interpretation and management strategy.

A 55-year-old patient with previous lumbar spine surgery requires epidural catheter placement for postoperative analgesia. Pre-procedure ultrasound shows loss of normal posterior complex and irregular acoustic shadowing at L3-L4 and L4-L5 levels. The L2-L3 level shows preserved anatomy with a depth of 6 cm to the epidural space. Which technical modification would provide the best success rate?

A 65-year-old patient with BMI 32 kg/m² is scheduled for interscalene block. Ultrasound shows the brachial plexus roots appearing 4 cm deep. Which approach would be most appropriate?