McG
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The title of this article inspires one to think of Dr Obvious, but it actually has some interesting stuff once you get into it.
That blast can cause brain injuries is not a surprise, but that those injuries can occure from blast exposure we wouldn't give a second thought and that the injured can remain oblivious. I suspect the studies that stem from this will be interesting to follow. What is the actual threshold of injury & how is that preceived by a person? How does this manifest itself as problems/symptoms down the road?
That blast can cause brain injuries is not a surprise, but that those injuries can occure from blast exposure we wouldn't give a second thought and that the injured can remain oblivious. I suspect the studies that stem from this will be interesting to follow. What is the actual threshold of injury & how is that preceived by a person? How does this manifest itself as problems/symptoms down the road?
Battlefield blast waves can cause concussions
Explosion energy hurts brain tissue, study findsToronto Star
Joseph Hall
05 May 11
Soldiers left standing near battlefield explosions may suffer concussions without any other sign of injury, a new Toronto study shows.
Merely being in the vicinity of an improvised explosive device or other high-charged detonations can cause significant injury to the delicate white matter that wires our brains together, the St. Michael's Hospital research says.
"It's possible to get brain injury and at the same time feel perfectly fine otherwise," says Dr. Andrew Baker, the hospital's chief of critical care. "The brain is more vulnerable (to explosions) than the lungs - or any other organ," he says.
Baker's team simulated the millisecond blast wave at the leading edge of an explosion and trained it through a tube on lab rats. They found waves that were only 25 per cent as powerful as those that could cause injuries to the lungs, liver or heart could significantly harm the white matter's axon wiring.
"I delivered a blast wave energy to some brain tissue that wouldn't cause injuries to the lungs or anything else," Baker says. "We found that some of the white matter cells were broken and even some of them that weren't broken were not functioning well." he says.
An explosion's energy wave may not even register with the soldiers it is injuring, says Baker, who is presenting his findings Thursday at the opening of the hospital's new Keenan Research Centre on Victoria St.
"The energy transfer that causes the brain injury doesn't come from a hit to the head into a car windshield or against a hockey rink," Baker says.
"It's coming from a high- and low-pressure energy wave that gets transmitted through the air and then through the skull and through the brain," he says.
This wave can extend well beyond a bomb's body-throwing blast and the following heat and shrapnel, Baker says.
"They (soldiers) may not even really be aware of it," he says.
The study was originally published in the March issue of the Journal of Neurotrauma.
The research suggests many Canadian soldiers serving in Afghanistan may have undiagnosed brain injuries, he says, adding it shows soldiers who have been near explosions should be tested for signs of concussion whether they report being injured or not.