Apr 6, 2014
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Temporary loss of consciousness that may be induced by a severe spasm of coughing. This is the result of the high pressure that may be induced in the chest – over 200 millimetres of mercury – by such a spasm, which prevents the return of blood to the heart. The veins in the neck begin to bulge and the blood pressure falls; this may so reduce the blood flow to the brain that the individual feels giddy and may then lose consciousness. (See FAINTING.)

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Medical Dictionary

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