High Embolic Risk with Orbital Atherectomy for Calcified Peripheral Artery Disease
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Overview
Ex vivo experimental study demonstrates high embolic debris and frequent dissections during orbital atherectomy, highlighting the need for distal embolic protection.
Key Points
To assess the biomechanical effects, luminal changes, and embolic risk associated with orbital atherectomy and subsequent balloon angioplasty in calcified human femoropopliteal arteries.
Evaluated N=10 human femoropopliteal arteries with advanced calcification in an ex vivo pulsatile flow loop replicating physiologic hemodynamics.
Performed sequential orbital atherectomy (OA) and balloon angioplasty (BA), followed by micro-computed tomography (μCT) to quantify luminal remodeling.
Captured embolic debris with 100 μm filters and assessed pressure gradients, flow rates, and vessel pulsatility using sensors, duplex ultrasound, and optical imaging.
OA and BA yielded an additive total lumen volume gain of 0.409 mL but frequently induced arterial dissections.
OA generated significant embolic debris (mean area 0.386 ± 1.654 mm²), with 90% of arteries releasing fragments ≥1 mm and 10% releasing fragments >5 mm, while BA added smaller debris (0.143 ± 0.361 mm²).
Translesional pressure gradients improved in only 40% of vessels, remained unchanged in 50%, and worsened in 10%; net flow was unchanged or decreased in 60% due to dissections or distal debris obstruction.