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New stent devices fight strokes

March 25, 2015
Loyola University Health System
In certain stroke patients, a new device called a stent retriever can reverse symptoms and limit stroke damage. The "stentriever," deployed with a catheter, restores blood flow and retrieves a blood clot from the brain.

Elizabeth Celli was experiencing a moderate-to-severe stroke when she arrived at Loyola University Medical Center's Emergency Department.

Mrs. Celli was weak on her left side, had difficulty speaking and was unable to walk. But after being treated with a new device called a stent retriever, her symptoms dramatically reversed.

Neurosurgeon Asterios Tsimpas, MD, used a catheter to deploy the device, also known as a stentriever. The device restored blood flow and retrieved a blood clot that was blocking blood to a major part of her brain.

Before the procedure, Mrs. Celli had a score of 19 on the National Institutes of Health's 0-to-42 point Stroke Scale. After the procedure, her scored dropped to 1, indicating almost no lasting effects.

About 85 percent of strokes are ischemic, meaning they are caused by clots that block blood flow to the brain. The intravenous clot-busting drug tissue plasminogen activator (tPA) can restore blood flow, if it is given soon enough and the clot is small enough. But in many patients, tPA alone is not sufficient to restore blood flow. In such cases, mechanical devices deployed with catheters can be used to remove the clot.

The latest mechanical device is a stentriever. The device is a self-expanding mesh tube attached to a wire, which is guided through a catheter (thin tube). The surgeon inserts the catheter in an artery in the groin and guides the catheter through various blood vessels up to the blood clot in the brain. The stentriever pushes the gelatinous blood clot against the wall of the blood vessel, immediately restoring blood flow. The stentriever then is used to grab the clot, which is pulled out when the surgeon removes the catheter. This technique, known as an endovascular treatment, is much less invasive than traditional open surgery, in which a portion of the skull is removed to gain access to the brain.

Stentrievers work faster and are more reliable than earlier generations of mechanical catheter devices, said Loyola neurosurgeon William W. Ashley Jr., MD, PhD. "And devices are continually evolving and improving," Dr. Ashley said.

Four recent clinical trials have demonstrated the effectiveness of stentrievers. For example, results of the recent multicenter, international trial known as ESCAPE were so convincing the trial was stopped early. Stroke patients were randomly selected to receive tPA alone or tPA plus endovascular treatment with stentrievers. After 90 days, 53 percent of the endovascular group was functionally independent, compared with 29.3 percent in the group receiving tPA alone. The mortality rate was 10.4 percent in the endovascular group, compared with 19 percent in the group receiving tPA alone. The study was published in the New England Journal of Medicine.

Three other recent trials -- SWIFT PRIME, EXTEND-IA and MR CLEAN -- also demonstrated the effectiveness of the newer endovascular treatments. However, only a small percentage of stroke patients experience the type of ischemic stroke examined in the trials and also arrive at the emergency department within six hours of the onset of the stroke, when endovascular treatment is most effective.

Dr. Tsimpas and Dr. Ashley have completed advanced fellowship training in minimally invasive endovascular surgery. They are assistant professors in the departments of Neurological Surgery and Radiology of Loyola University Chicago Stritch School of Medicine.

Loyola's multidisciplinary Stroke Center is composed of a nationally recognized team of experts in nearly every facet of stroke-related care, including emergency medicine, neurology, neurosurgery, neurospsychology, neuroradiology, rehabilitative services, social work, nutrition, pharmacy and specialty nursing.

When Mrs. Celli arrived at Loyola, the stroke team rapidly assessed her, ordered an immediate CT scan and put her on the clot-busting drug tPA. The stroke team determined that Mrs. Celli qualified for the endovascular treatment.

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Materials provided by Loyola University Health System. Note: Content may be edited for style and length.

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Loyola University Health System. "New stent devices fight strokes." ScienceDaily. ScienceDaily, 25 March 2015. <>.
Loyola University Health System. (2015, March 25). New stent devices fight strokes. ScienceDaily. Retrieved April 20, 2024 from
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