Heart rate and carotid blood flow were measured in 82 elderly nursing home residents in both supine and sitting positions. The subjects had been divided into two groups according to whether or not they had had an episode of chronic cerebrovascular disease. In subjects with chronic cerebrovascular disease, the heart rate in the sitting position was significantly ( P < 0.01) faster than that in the supine position but there were no significant differences in total carotid blood flow volume or in mean carotid blood flow velocity between the positions. In subjects with chronic cerebrovascular disease, there were also no significant correlations between heart rate, total blood flow volume, or mean blood flow velocity, in either position, and age. In subjects without chronic cerebrovascular disease, the results for postural change were the same as those in subjects with chronic cerebrovascular disease but in both positions there was a significant negative correlation between age and both total carotid blood flow volume and mean carotid blood flow velocity.
Preferred Technique for Blood Flow Volume Measurement in Cerebrovascular Disease
