The VOR reflex does not depend on visual input and works even in total darkness or when the eyes are closed.
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The blood vessels bring nutrients that provide the energy the muscle needs to contract.
The first dose each night was taken at bedtime and the second dose was taken 2.5 to 4В hours later.
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Sedatives, analgesics, and all other medications except those that might be deemed essential (such as digitalis and insulin) are withheld for at least 24 hours, and preferably 48 to 72 hours, prior to the test.
Variable results on clearance have been obtained in acute studies of healthy volunteers; clearance of verapamil was either reduced or unchanged.