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Interruption of cerebral blood flow may result from all of the following, EXCEPT:
an acute arterial rupture
an embolism
a thrombus
cerebral vasodilation
The correct answer is: cerebral vasodilation
This is because an interruption of cerebral blood flow can result from a decrease in blood supply, which would occur with an arterial rupture, embolism, or thrombus. However, cerebral vasodilation refers to an increase in blood flow, so this would not result in an interruption of cerebral blood flow.