Sponsored by BIOTRONIK
Case Report: Revascularizing BTK Occlusions Using the Carnelian Support Microcatheter
A 77-year-old woman was referred to our vascular center for atypical rest pain in both legs (the left side was more severe than the right side). Her medical history revealed atrial fibrillation, arterial hypertension, stage 2 to 3 chronic renal insufficiency, and rheumatoid and psoriatic arthritis. The patient reported a failed attempt of revascularization of the left side in another hospital. MRA performed in the other hospital (not shown) demonstrated an occlusion of the superficial femoral artery (SFA), the popliteal artery, and all proximal segments of all three below-the-knee (BTK) arteries on the left side. On the right side, the SFA and popliteal artery were patent. The posterior and anterior tibial arteries were occluded, with a single-vessel outflow on the fibular artery.
Given the more severe symptoms on the left side, a revascularization procedure of the left SFA, popliteal artery, and BTK arteries in an ambulatory setting was planned and completed successfully with immediate relief of the rest pain. Given the good clinical outcome on the left side, an ambulatory revascularization procedure of the right lower leg was planned.
Antegrade access was achieved in the right common femoral artery under ultrasound guidance, and a 4-F introducer sheath was placed. Diagnostic angiography confirmed patency of the femoropopliteal segment and fibular artery, as well as an occlusion of both the posterior and anterior tibial arteries, and patency of the lateral plantar artery and a small dorsalis pedis artery (Figure 1). Attempts to cross the occlusion of the posterior and anterior tibial arteries were unsuccessful. Subsequently, selective angiography of the fibular artery was performed, demonstrating a small anterior collateral branch connecting to the dorsalis pedis and a large posterior collateral branch (with a corkscrew appearance proximally) with a connection to the lateral plantar artery (Figure 2).
Selective cannulation of the fibular artery with a 4-F multipurpose diagnostic catheter was performed. A 0.014-inch Glidewire Advantage guidewire (Terumo Interventional Systems) was advanced into the distal fibular artery, and the diagnostic catheter was exchanged for a Carnelian® Support BTA microcatheter (BIOTRONIK). It was not possible to advance the guidewire through the tortuous corkscrew segment (Figure 3A), so an exchange was made for a 0.014-inch Glidewire GT guidewire (Terumo Interventional Systems). The latter navigated without issue through the tortuous segment (Figure 3B) into the lateral plantar artery, and the Carnelian Support catheter was advanced over the guidewire into the lateral plantar artery toward the distal posterior tibial artery. It was not possible to advance the Glidewire GT guidewire toward the distal posterior tibial artery, and therefore an exchange was made for a 0.014-inch Hi-Torque Command guidewire (Abbott), leaving the Carnelian Support catheter in place.
After formation of a loop in the tip of the Hi-Torque Command guidewire, it was possible to cross the occlusion in the distal posterior tibial artery and advance the Carnelian Support catheter into the patent segment of the posterior tibial artery (Figures 3C–3E). Intraluminal positioning of the catheter was confirmed (Figure 3F). The Carnelian Support catheter was left in place, and through the 4-F sheath, a second guidewire (0.014-inch Glidewire Advantage) was inserted in an antegrade fashion next to the Carnelian Support catheter and advanced into the distal segment of the posterior tibial artery (Figure 3G). Using the Carnelian Support catheter as a track, the guidewire was easily advanced in a looped fashion into the lateral plantar artery (Figure 3H). With the antegrade guidewire left in place, the Carnelian Support catheter was withdrawn, an angioplasty balloon was advanced over the antegrade guidewire, and intraluminal positioning in the lateral plantar artery was confirmed (Figure 3I). Percutaneous transluminal angioplasty of the posterior tibial artery was performed using a 2.5- X 200-mm angioplasty balloon (Figure 3J).
Control angiography demonstrated reconstitution of antegrade flow into the lateral plantar artery (Figure 3K) with a triphasic Doppler signal. Hemostasis was obtained with manual compression. The patient was discharged the same day and became fully asymptomatic.