Researchers have been taking a closer look at what happens in the brain during and after a stroke, particularly at patterns of blood circulation. We need to rethink a basic rule that has guided stroke care for the past 25 years, declares the brain specialist who first proposed it. The study was published in the Journal of Stroke & Cerebrovascular Diseases.
A stroke occurs when the blood supply to a part of the brain stops and cells begin to die due to lack of oxygen and nutrients. There are two main types of stroke: ischemic and hemorrhagic. Ischemic strokes, which result from clots or blood vessel constrictions, are by far the most common. Hemorrhagic strokes occur when vessels burst.
Collateral circulatory competence'
A stroke specialist from Loyola University Medical Center in Maywood, IL argues that time should not be the only factor to dictate how ischemic stroke is treated. The effect of time is likely to be different in different cases, depending on what is known as the person's "collateral circulatory competence."
When an ischemic stroke occurs, cells in a "core of brain tissue" start to die. However, the cells that surround the core which is known as the penumbra can still receive oxygen and nutrients and stay alive if there is good collateral circulation. The more robust the collateral circulation is, the longer the cells live.
The use of a computational model helped identify four types of ischemic stroke that differ by the pattern of collateral blood circulation. He notes that modeling the types allows "forecasting of the fate of the ischemic process over time."
Time is not the only factor
He concludes that because we can now "readily identify" distinct collateral circulation patterns for different people, it is possible to predict how the aftermath of stroke is likely to affect the brain.This improves opportunities to analyse the stroke process and select the best treatment.
Acting FAST saves lives
Dr. Gomez's suggestions affect decisions made in the emergency room, so it is still important to call 911 and get help immediately if you think that someone is having a stroke. In the United States, around 140,000 people die from stroke every year, accounting for some 1 in 20 deaths.
For 1 out of every 4 of the 795,000 people in the U.S. who have a stroke, it is not their first; and in 87 percent of cases, the stroke is ischemic. The total cost of stroke in the U.S. is in the region of $34 billion per year. This includes healthcare, medication, and lost productivity.