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A comment on Woman Knocked Unconscious at Parade by Falling Drone. Parent comment

Re:Woman Knocked Unconscious at Parade by Falling Drone by wlesieutre on Monday June 29, 2015 @09:36PM (#9802316)
Calling 911 seems like an appropriate reaction when somebody gets knocked out by an object dropped on their head
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Re:Woman Knocked Unconscious at Parade by Falling Drone by schoen on Tuesday June 30, 2015 @12:22AM (#9802941)
Definitely. People should be seen by a doctor when they lose consciousness from a blow to the head, because of the risk of concussion (as well as other kinds of brain injury). Concussion can last for days or longer, and failing to rest puts the victim at greater risk of complications or re-injury.

http://www.cdc.gov/concussion/pdf/Facts_about_Concussion_TBI...

I wish I had a better source than that, because I found the advice on p. 4 kind of ambiguous (whether "should be taken seriously" is meant to make an emergency room visit more urgent or less urgent).

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