PRU-Guided Cangrelor for Endovascular Reconstruction of Traumatic Internal Carotid Artery Injury in Adolescents: A Single-Center Case Series

When a severe injury strikes the neck or head, the delicate arteries that carry blood to the brain can tear, bruise, or become blocked. In the most dangerous scenarios, a piece of bone might crush a vessel, or a bullet might slice through it, leaving a weak spot that could burst or a clot that could starve the brain of oxygen. To fix this, doctors sometimes insert a tiny mesh tube, called a stent, to hold the artery open and restore flow. However, metal inside a blood vessel acts like a magnet for clots. To prevent the stent from becoming blocked, patients must take strong medicines that stop their blood from clotting too easily. This creates a difficult balancing act: the medicine must be strong enough to protect the new stent, but not so strong that it causes dangerous bleeding elsewhere in the body. This problem becomes especially tricky when a patient is a teenager who has suffered multiple injuries, cannot swallow pills, or needs to undergo other surgeries where bleeding must be controlled.

A team of doctors at the University of Wisconsin recently explored a different way to handle this delicate balance in three teenage patients. They used a powerful, fast-acting medicine given through an intravenous line instead of relying on pills. This medicine works almost instantly and stops working just as quickly once the drip is turned off, giving doctors precise control over how much the blood is thinned. To ensure the dose was just right, they monitored the patients' blood platelets—the tiny cells responsible for clotting—using a test that measures how well the medicine is working. The researchers found that this approach allowed them to successfully repair damaged neck arteries in teenagers who could not take standard oral medication, without causing the stents to clot or triggering uncontrollable bleeding. While the study is too small to prove this method is perfect for everyone, it suggests a viable path forward for treating complex trauma cases where traditional options fail.

The challenge of treating these injuries is that the window for error is incredibly narrow. If the blood is too thick, the new stent might clog, cutting off blood to the brain and causing a stroke. If the blood is too thin, the patient might bleed out from other wounds or from the surgery itself. Usually, doctors prescribe pills that patients take by mouth to keep the blood thin. But in the chaos of a severe accident, a teenager might be unconscious, have a broken jaw, or have a stomach that cannot process food, making it impossible to swallow pills. In these moments, the standard treatment hits a wall. The doctors in this study turned to a liquid form of a blood-thinning drug called cangrelor. Unlike pills that take time to digest and work, this liquid drug enters the bloodstream immediately and stops working within an hour of being stopped. This speed allows doctors to adjust the treatment minute by minute, turning the flow up or down depending on what the patient needs at that exact moment.

To see if this method worked, the team looked back at the records of three teenagers, aged fourteen to seventeen, who had suffered severe car accidents or gunshot wounds that damaged the main artery in their neck. One girl had a large, balloon-like bulge in her artery caused by a crash; a boy had a shattered artery from a gunshot; and another boy had his artery completely crushed by broken skull bones. All three required emergency surgery to place a stent and reopen the artery. Because they could not reliably take pills, the medical team started an intravenous drip of cangrelor. They did not just guess the right amount; they used a specific test to measure the activity of the patients' platelets. This test, known as a platelet function test, gave them a number that showed exactly how much the drug was working. They adjusted the drip rate to keep that number within a safe range: low enough to prevent clots on the stent, but high enough to avoid dangerous bleeding.

The results were encouraging. In all three cases, the surgeons successfully placed the stents and restored blood flow to the brain. None of the teenagers suffered a stroke or a clot in the new stent while they were on the drip. There were complications, but they were tied to the severity of their original injuries rather than the medicine itself. One girl had a bleed in her brain after a drain was removed, and a boy developed a large bruise on his neck that required surgery to stop the bleeding. In both cases, the doctors had to make difficult choices about when to pause the drip and when to restart it, but the ability to stop the drug quickly helped them manage these crises. Once the patients were stable and could swallow again, the team carefully switched them back to oral pills, using the same platelet tests to ensure the transition was smooth and safe.

The study highlights that while this approach worked for these specific teenagers, it is not a simple fix for every child. The patients were older adolescents, and the doctors noted that the method might not work the same way for younger children. Furthermore, the study involved only three people, which is too small to declare this the new standard of care. The researchers emphasized that this was a demonstration of possibility, not a final proof of superiority. They pointed out that using this method requires constant monitoring, dedicated medical staff, and expensive equipment, making it difficult to use in every hospital. However, for the specific group of patients who are too injured to take pills and too unstable to wait, this strategy offered a lifeline. It showed that with careful monitoring and rapid adjustments, doctors can navigate the treacherous gap between preventing clots and preventing bleeding, even in the most complex trauma cases.

The work also revealed the importance of timing when switching from the liquid drug back to pills. Because the liquid drug leaves the system so fast, the team had to give the next dose of pills at a precise moment to ensure there was no gap in protection. They found that giving the pill slightly before stopping the drip helped maintain a steady shield against clots. This nuance, discovered through trial and error in these three cases, provides a roadmap for how other doctors might handle similar transitions in the future. The study does not claim to have solved the problem of treating traumatic artery injuries in children, but it does offer a clear, practical example of how to manage a high-stakes situation when the usual tools are unavailable. By focusing on the individual needs of each patient and using real-time data to guide decisions, the team managed to save the arteries and the lives of three teenagers who faced a very uncertain future.