“Commissural drop” wiring technique facilitates catheter crossing of severely stenotic aortic valve
Severe calcific aortic stenosis—where the heart’s aortic valve hardens, narrows, and restricts blood flow—is a life-threatening condition. Transfemoral transcatheter aortic valve replacement (TAVR) has become a gold-standard treatment, letting doctors replace the damaged valve through a small groin incision. But even with advanced technology, one critical hurdle often slows procedures: getting catheters past the tightly narrowed valve. For an 82-year-old man with extreme stenosis, a new “commissural drop” wiring technique turned a stuck procedure into a success—and offers a simpler solution for tough cases.
The man’s valve was critically narrowed: his aortic valve area measured just 0.48 cm² (normal is 3–4 cm²), with a peak blood flow velocity of 5.19 m/s (severe stenosis is defined as over 4 m/s) and a mean pressure gradient of 78 mmHg (severe is above 40 mmHg). During his TAVR, doctors used a standard 0.035-inch straight-tip glide wire (Terumo) and a Judkins Right 4 (JR4) catheter (Medtronic)—a curved tool common in heart procedures—to cross the valve. But the JR4 catheter couldn’t get through: the wire was stuck in the gap between the left and right coronary leaflets (called the LC/RC commissure), creating a sharp angle that made pushing the catheter impossible.
Instead of switching to a different catheter (a time-consuming workaround that adds risk), the team tried something innovative: they gently pushed the glide wire further through the valve. As the wire’s stiffer middle section moved past the stenosis, both the wire and JR4 catheter “dropped” into a better gap—the space between the non-coronary and left coronary leaflets (NC/LC commissure). This new position gave the catheter a straight, easy path through the valve.
With the catheter in place, doctors implanted a 34 mm self-expanding Evolut R valve (Medtronic). The procedure went smoothly, and the man was discharged without complications—all thanks to the commissural drop technique (see the step-by-step process in this supplementary video: http://links.lww.com/CM9/A353).
Why does this matter? While doctors frequently struggle with wire crossing in severe stenosis (a challenge highlighted in a 2015 JACC Cardiovasc Interv study), few techniques focus on helping catheters pass over the wire once it’s in place. This is a critical gap: switching catheters can delay procedures, increase radiation exposure, or raise the risk of vessel damage—especially for older adults or those with fragile blood vessels. The commissural drop technique solves this by using the same wire and catheter, reducing complexity and keeping procedures on track.
The study, published in the Chinese Medical Journal in 2021, was led by researchers from the Valve Science Center at Minneapolis Heart Institute Foundation (USA) and the Department of Cardiology at Beijing Anzhen Hospital (China): Yu Du, Paul Sorajja, Miho Fukui, Go Hashimoto, Aisha Ahmed, and Mario Gössl (corresponding author). Their work fills a key need in TAVR: making it easier to handle the most stenotic, calcified valves without extra tools or steps.
For patients with severe aortic stenosis, every procedural win counts. The commissural drop technique isn’t just a “trick”—it’s a practical, evidence-backed way to help doctors deliver life-saving TAVR care more efficiently. And for the 82-year-old man at the center of this study, it meant a second chance at a normal life.
doi.org/10.1097/CM9.0000000000001142
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