SEP 20, 2016 8:07 PM PDT

Treating "Wake-Up Stroke" With Tissue Plasminogen Activators

WRITTEN BY: Kara Marker
The window of safety and efficacy for administering tissue plasminogen activator (tPA), the only FDA-approved medication for stroke, is less than four hours. For patients with “wake-up stroke,” scientists have long been unconvinced that risks of using tPA outweigh the potential health benefits. However, a new study shows tPA is safe for these stroke patients after all. 
Credit: Medscape.com
“Wake-up stroke,” which is literally the instance of an individual waking up with stroke symptoms after falling asleep with no known symptoms, makes up nearly 25 percent of all strokes that occur. Because there is no way for doctors to know when these patients started exhibiting stroke symptoms, they are usually ineligible for tPA. Principal investigator Andrew Barreto, MD, from the University of Texas, has reason to believe that tPA could in fact help these patients avoid irreversible complications from stroke.

“[Upon waking] the body undergoes many changes to prepare itself for wakefulness including elevating the blood pressure by releasing stress hormones," Barreto said. "Without tPA or some other form of restoring blood flow, the majority of these patients will be left with disabling effects."

Barreto and his team studied 40 patients from five stroke centers with wake-up stroke who were also treated with tPA within three hours after waking up. The researchers saw no intracerebral hemorrhaging, a condition believed to be more likely when tPA is administered more than three or four hours after onset of stroke symptoms. 

Additionally, at three-month follow-up, over half of the patients achieved “excellent recovery,” according to the modified Rankin Scale, a “global outcomes rating scale for patients post-stroke... used to categorize level of functional independence with reference to pre-stroke activities rather than on observed performance of a specific task.”

tPA, also known as intravenous thrombolysis, works by dissolving blood clots that cause stroke, improving blood flow to the deprived parts of the brain. A 2011 study estimated that only three to five percent of stroke patients reach the hospital in time to be considered eligible for tPA treatment. Overall, strokes are considered to be 80 percent preventable by managing risk factors such as hypertension, cigarette smoking, atrial fibrillation and physical inactivity. 

Barreto’s study was recently published in the Annals of Neurology.
 


Sources: The Neurohospitalist, Baylor University Medical Center Proceedings, American Stroke Association, Heart & Stroke Foundation, University of Texas Health Science Center at Houston
 
About the Author
  • I am a scientific journalist and enthusiast, especially in the realm of biomedicine. I am passionate about conveying the truth in scientific phenomena and subsequently improving health and public awareness. Sometimes scientific research needs a translator to effectively communicate the scientific jargon present in significant findings. I plan to be that translating communicator, and I hope to decrease the spread of misrepresented scientific phenomena! Check out my science blog: ScienceKara.com.
You May Also Like
SEP 23, 2020
Cannabis Sciences
Hemp Seeds May Reduce Heart Disease Risk
SEP 23, 2020
Hemp Seeds May Reduce Heart Disease Risk
Heart disease is the leading cause of death around the world. And it seems that many methods to avoid it involve lifesty ...
SEP 28, 2020
Cardiology
A Single-Cell Atlas Provides New Details on the Heart
SEP 28, 2020
A Single-Cell Atlas Provides New Details on the Heart
For the first time, researchers have gained unprecedented insight into the function of the healthy human heart by creati ...
OCT 20, 2020
Cardiology
Investigating a New Method in Heart Repair
OCT 20, 2020
Investigating a New Method in Heart Repair
Cardiovascular disease is a widespread issue that affects millions across the world. One of the most common of these dis ...
NOV 12, 2020
Cardiology
Creating a Mouse Model to Test RBM20 Dependent Dilated Cardiomyopathy
NOV 12, 2020
Creating a Mouse Model to Test RBM20 Dependent Dilated Cardiomyopathy
Cardiovascular disease is something that, in most cases, is within our ability to control. A healthy diet and active lif ...
NOV 10, 2020
Genetics & Genomics
Learning More About the Causes of Preeclampsia
NOV 10, 2020
Learning More About the Causes of Preeclampsia
Preeclampsia is a complication of pregnancy characterized by high blood pressure and it arises in anywhere from two to e ...
APR 08, 2021
Immunology
It's Not Just Cholesterol That Clogs Arteries
APR 08, 2021
It's Not Just Cholesterol That Clogs Arteries
Researchers have discovered a gene that is directly linked to the development of cardiovascular diseases, such as high b ...
Loading Comments...