Vasovagal fainting or syncope A. Causes loss of consciousness. B. Is

1.	Vasovagal fainting or syncope A. Causes loss of consciousness. B. Is associated with tachycardia. C. Is associated with skeletal muscle vasodilation. D. Is more likely to occur when standing than when lying down. E. Is more likely to occur in a cold than in a hot environment.
Answer» A. True Due to cerebral ischaemia caused by the abrupt fall in arterial pressure. B. False Increased vagal activity slows the heart and reduces cardiac output. C. True This vasodilation reduces peripheral resistance. D. True Because of gravity, pressure in cerebral arteries is lower when standing than when lying down. E. False The skin vasoconstriction in cold environments raises peripheral resistance.

Vasovagal fainting or syncope A. Causes loss of consciousness. B. Is associated with tachycardia. C. Is associated with skeletal muscle vasodilation. D. Is more likely to occur when standing than when lying down. E. Is more likely to occur in a cold than in a hot environment.

Answer»

A. True Due to cerebral ischaemia caused by the abrupt fall in arterial pressure.

B. False Increased vagal activity slows the heart and reduces cardiac output.

C. True This vasodilation reduces peripheral resistance.

D. True Because of gravity, pressure in cerebral arteries is lower when standing than when lying down.

E. False The skin vasoconstriction in cold environments raises peripheral resistance.

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Vasovagal fainting or syncope A. Causes loss of consciousness. B. Is associated with tachycardia. C. Is associated with skeletal muscle vasodilation. D. Is more likely to occur when standing than when lying down. E. Is more likely to occur in a cold than in a hot environment.

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