Loss of consciousness occurs in less than 10 percent of patients who sustain concussions, contrary to popular belief.
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The prosecutor said it was not a case of dangerous driving but "very much a case of momentary loss of consciousness and concentration".
The clinical effects include runny nose, chest pain, shortness of breath, confusion, followed by vomiting, loss of bowel and bladder function, convulsions, loss of consciousness, and suffocation.
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Types of injuries which would be sent to the Royal Cornwall Hospital include chest pains, strokes, head injury with loss of consciousness, severe abdominal pain and all severely ill children.
Duerson suffered a minimum of 10 known concussions during the course of his career, some of them involving loss of consciousness, said Dr. Robert Stern, co-director of the Boston University center.
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Sex headaches associated with loss of consciousness, vomiting, stiff neck, other neurologic symptoms and severe pain lasting more than 24 hours are more likely to be due to an underlying cause.
In the other studies, there was no evidence of adverse effects on kidney and liver function, no reports of light-headedness or loss of consciousness, no evidence of fluid or electrolyte loss that might contribute to heat stroke.
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"All sources we have spoken to say there is a pattern of victims suffering a variety of respiratory complaints from mild breathing difficulty, through fainting and vomiting to loss of consciousness and death, " reporter Alex Thomson wrote on his blog.
The guidelines say the definition of death should be regarded as the irreversible loss of the capacity for consciousness, combined with irreversible loss of the capacity to breathe.
And while nine years have come and gone since that September morning, the passage of time will never diminish the pain and loss forever seared in the consciousness of our nation.
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