1 For instance, contributions to a Roth IRA are not tax deductible while contributions to a traditional IRA may be deductible. 2  However, while distributions (including earnings) from a traditional IRA may be included in income, the distributions (including earnings) from a Roth IRA are not included in income. For instance, contributions to a Roth IRA are not tax deductible while contributions to a traditional IRA may be deductible. 2  However, while distributions (including earnings) from a traditional IRA may be included in income, the distributions (including earnings) from a Roth IRA are not included in income.
Reduced brain blood flow can lead to dizziness, lightheadedness, and, sometimes, loss of consciousness. It can occur when getting up rapidly because blood pools in the abdomen and legs due to gravity if something interrupts the normal mechanisms that help return blood back up to the heart and brain.
By placing a radioactivity counter over the head, one can measure the amount of blood flow into the brain. (See How Nuclear Medicine Works .) The cerebral blood flow study takes 20 to 30 minutes to perform. If there is no blood flow to the brain as demonstrated by this study, the brain is dead.A negative cerebral flow study is indisputable evidence of a dead brain. Normal cerebral blood flow study showing cranial space filled with blood. Cerebral blood flow study showing no blood entering the brain.Another confirmatory test is chemical: The patient can be given 1 mg of atropine IV.In the patient with an intact brain, atropine will dramatically increase the patient's heart rate. In a brain-dead patient, atropine will not influence heart rate.y placing a radioactivity counter over the head, one can measure the amount of blood flow into the brain. (See How Nuclear Medicine Works .) The cerebral blood flow study takes 20 to 30 minutes to perform. If there is no blood flow to the brain as demonstrated by this study, the brain is dead.