Repositioning Direxion™ Without a Wire in Two Advanced Embolization Cases
An 85-year-old woman fell down a few stairs at her home and was brought to the hospital for treatment. She was on warfarin sodium tablets and her prothrombin time was high (PT-INR of 3). She presented with moderate hypotension, alleviated by fluids and blood.
A quick CT showed acute extravasation from her spleen with a large subcapsular bleed (Figure 1). The trauma surgeon asked for a proximal splenic embolization while they prepared the patient for a laparoscopic splenectomy.
On initial angiography, the origin of the patient’s celiac artery was nearly occluded, and it could not be cannulated to access the splenic artery. Instead, we accessed the superior mesenteric artery (SMA) and performed an injection, which demonstrated retrograde filling of the splenic artery through pancreaticoduodenal collateral branches (Figure 2).
With diagnostic access in the SMA, we then placed a preshaped 0.021-inch (0.53-mm) Direxion™ Microcatheter into the vessel and maneuvered predominantly without wire guidance to avoid causing any spasm through the collaterals to the origin of the splenic artery. Due to the impressive flow rates of the 0.021-inch (0.53-mm) Direxion™ Microcatheter, we were able to obtain a good angiogram (Figure 3).
Once we reached our target, we placed several Interlock™-18 Fibered Detachable Coils at the origin of the splenic artery. The stable nature of the Direxion™ Microcatheter allowed us to create a precise, dense pack of coils at our intended location.
The good flow rates of Direxion™ allowed us to then get another good check with a postembolization angiogram (Figure 4). Finally, angiography was completed with a diagnostic catheter injection (Figure 5), which demonstrated complete occlusion of the splenic artery. Upon completion of the embolization procedure, the patient had an uneventful laparoscopic splenectomy.
The torque characteristics of the Direxion™ Microcatheter provided by the outer layer of nitinol as well as its soft-shaped tip allowed us to maneuver the catheter predominantly without wire guidance and without causing spasm in this case.
These features are unique to the Direxion™ Microcatheter, and its other features, including excellent flow rates and a stable platform for coiling, helped to make this case possible.
A 66-year-old woman presented to the hospital after a motor vehicle accident with active extravasation in her left lateral chest wall, requiring massive transfusions. On CT angiography, she demonstrated active extravasation with a massive hematoma (Figure 6).
We quickly engaged the intercostal artery with a reverse-curve Mickelson diagnostic catheter and performed an injection (Figure 7), which showed a very small and distal vessel with a sharp takeoff. Intercostal arteries are prone to spasm, but we had to access and embolize the bleed. We placed a 0.021-inch (0.53-mm) Direxion™ Microcatheter through the Mickelson catheter and successfully cannulated the intercostal vessel. The Direxion™ Microcatheter moved easily without a wire, which we elected to do to avoid the risk of wire-induced spasm. We moved very distal with Direxion™ and were still able to perform good injections in the small vessel (Figure 8). Embolization was performed (Figure 9), and the patient stabilized.
The Direxion™ Microcatheter has great torqueability and pushability, which allows for distal access in very small vessels without the need for a wire. This technique to reposition the catheter tip without a wire reduces the risk for spasm and possible perforation of the vessel. Once in a distal vessel, the ability to get good injection volumes for excellent angiographic visibility is important, and this can be achieved with Direxion™. Finally, the stability of the Direxion™ Microcatheter is also ideal for coil and other embolizations with little risk of catheter displacement.
R. Dana Tomalty, MD
Disclosures: Received no compensation for this article and is not a consultant to Boston Scientific Corporation; member of the Boston Scientific Interventional Oncology Advisory Board; consultant for MicroVention.
Results from case studies are not necessarily predictive of results in other cases. Results in other cases may vary.