If blood flow to the brain is interrupted, how quickly does cellular death occur?
8 minutes.
2 minutes
20 minutes
5 minutes
The Correct Answer is B
B. Brain cells begin to die within 2 minutes if blood flow is interrupted, which is why rapid intervention is crucial during a stroke or other conditions that block cerebral blood flow.
A. 8 minutes is too long for brain cells to survive without oxygen.
C. 20 minutes is too long for brain cells to survive without oxygen.
D. 5 minutes is too long for brain cells to survive without oxygen.
Nursing Test Bank
Naxlex Comprehensive Predictor Exams
Related Questions
Correct Answer is A
Explanation
A. Flashes of light and floaters are common early symptoms of retinal detachment as the retina begins to pull away from the underlying tissue.
B. Retinal detachment is usually painless; pain with eye movement is more associated with other eye conditions.
C. Increased glare is not typically associated with retinal detachment but may occur in cataracts.
D. Redness is usually a sign of conjunctivitis, not retinal detachment.
Correct Answer is D
Explanation
A. A ventriculostomy involves inserting a catheter into the ventricles of the brain to monitor ICP, not a procedure for instilling drugs.
B. A ventriculostomy involves the insertion of a catheter to monitor ICP, not an internal transducer.
C. Cerebrospinal fluid (CSF) samples can be taken via ventriculostomy; the procedure does not prevent this.
D. A ventriculostomy measures the pressure within the brain’s ventricles to monitor intracranial
pressure, which is the correct understanding.
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