CIR CIR Equipment Technology & Device Management

Question 1

What is the primary purpose of a hydrophilic coating on an interventional guidewire?

Accepted Answer

To reduce friction and improve trackability through tortuous vessels

Answer

Hydrophilic coatings reduce surface friction when wet, allowing guidewires to navigate through tortuous or occluded vessels with greater ease.

Question 2

Which catheter design feature is most important for delivering a coronary stent to a distal lesion?

Accepted Answer

High pushability and low crossing profile

Answer

A low crossing profile allows the stent delivery catheter to pass through tight stenoses, while high pushability ensures the device can be advanced to distal target sites.

Question 3

What does the French (Fr) size designation indicate about an interventional catheter or sheath?

Accepted Answer

The outer diameter in millimeters multiplied by 3

Answer

The French size equals three times the outer diameter in millimeters (1 Fr = 0.333 mm OD), so a 6 Fr sheath has an outer diameter of approximately 2 mm.

Question 4

When selecting a balloon catheter for coronary angioplasty, which parameter determines the maximum pressure the balloon can withstand before rupturing?

Accepted Answer

Rated burst pressure (RBP)

Answer

The rated burst pressure (RBP) is the manufacturer-tested maximum pressure at which 99.9% of balloons will not rupture, guiding safe inflation limits.

Question 5

A non-compliant balloon differs from a semi-compliant balloon primarily in that it:

Accepted Answer

Maintains a consistent diameter even at high inflation pressures

Answer

Non-compliant balloons resist expansion beyond their nominal diameter at high pressures, making them ideal for stent post-dilation and resistant lesions.

CIR - Cardiac Interventional Radiology Practice Test

CIR - Cardiac Interventional Radiology Practice Test

CIR CIR Equipment Technology & Device Management