Summary

One of the fundamental tenets of any technique of measuring cerebral blood flow is that the flow itself should not be influenced by changes in other variables during the acquisition of the data. In other words, stable physiological conditions (arterial pressure, carbon dioxide tension, mental activity, sympathomimetic activity) should be maintained. Each of the above techniques can be carried out at the bedside. All can be used in the conscious, anesthetized, or ventilated patient, and measurements have been obtained in the operating room (Cook.eia[ 1995) or intensive care unit (Bowton eta[ 1989). However, many believe that the required stability is difficult to achieve, particularly in the intensive care environment, and/or if the flow is low and the time of the clearance of isotope is prolonged.

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