Rationale for thrombus aspiration or distal protection devices in PCI?

• A. To reduce distal embolization and no-reflow in thrombotic or high-risk lesions, potentially improving microvascular perfusion.
• B. To reduce contrast load.
• C. To shorten procedure time.
• D. To prevent radial artery spasm.

Answer: (B)

Thrombus aspiration and distal protection devices are used to protect the downstream microcirculation from debris generated during PCI. When the culprit lesion has a high thrombus burden or is particularly plaque-rich, manipulating it can dislodge thrombus or plaque debris, which can travel to small distal vessels and cause occlusion or no-reflow. Thrombus aspiration tools physically remove the thrombus from the lesion, while distal protection devices either capture embolic debris (filters) or temporarily block flow so debris can’t reach the distal bed. This aims to preserve microvascular perfusion and improve myocardial reperfusion.

Reducing contrast load, shortening the procedure, or preventing radial artery spasm are not the primary purposes of these devices, though they may be influenced indirectly in some cases.