Originally Posted by Baja
What a sad situation.
There may have been some predisposing factors at play, depending on what kind of stroke she had. If it was an ischemic stroke (a clot blocks bloodflow to a portion of the brain), which is the most common type, many different kinds of forces could dislodge a predisposing thrombus... a car accident, slip on the stairs, even putting your head back in a hair salon sink.
It's unlikely that a fall on the buttocks would generate enough force or "shock wave" up a spine to cause a stroke out of the blue.
This information is partially correct. Ischemic strokes are the most common form of stroke (as opposed to hemorrhagic strokes). Ischemia is diminished oxygen delivery to an organ. There are many potential causes of ischemic brain injury; not all ischemic events are the result of thromboemboli, as eluded to above. Causes include endovascular injury, systemic hypotension, as well as thromboemboli. The most common cause of cerebral thromboemboli is atrial fibrillation.
That being said, this is a tragic situation. We know someone who suffered a similar fate. This person, like the snowboarder, was otherwise healthy, in the prime of her life, with a young family. She was involved in a low-speed automobile accident. She suffered an embolic event several days later. While she did survive, she is severely impaired. Sad, very sad. My condolences to the Ash family.