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(Stroke. 2000;31:2895.)
© 2000 American Heart Association, Inc.
Original Contributions |
Dynamic Cerebral Autoregulation Is Unaffected by Aging
From the Division of Medicine for the Elderly, University of Leicester, Glenfield Hospital, Leicester; and Division of Medical Physics, University of Leicester, Leicester Royal Infirmary (R.B.P.) (United Kingdom).
Correspondence to Dr Brian J. Carey, Division of Medicine for the Elderly, University of Leicester, Glenfield Hospital, Groby Rd, Leicester LE3 9QP, UK. E-mail brian.carey{at}glenfield-tr.trent.nhs.uk
Background and Purpose—Normal aging is associated with marked changes in the cardiovascular and cerebrovascular systems. Although cerebral autoregulation (CA) is impaired in certain disease states, the effect of age per se on dynamic CA in humans is unknown and the focus of this study.
Methods—Twenty-seven young subjects (
40 years) and 27 older
subjects (
55 years), matched for sex and systolic blood
pressure (BP), underwent measurement of cerebral blood flow velocity by
transcranial Doppler ultrasound and noninvasive
beat-to-beat arterial BP measurement during induced and
spontaneous dynamic BP stimuli. A standard dynamic autoregulatory index
(ARI) was derived for each spontaneous and induced dynamic BP stimulus
to include the step response, as well as cardiac baroreceptor
sensitivity (BRS), for the 2 groups.
Results—The mean age of the young group was 29±5 years, and that of the older group was 68±5 years. Cardiac BRS was reduced in the older group (8.6±4.5 versus 16.9±8.8 ms/mm Hg; P<0.0001). However, no age-related differences were demonstrated in step response plots or in ARI values for any pressor or depressor dynamic BP stimulus (P=0.62), with mean ARI values for all stimuli combined being 4.9±1.8 for the young group and 5.0±2.3 for the older group.
Conclusions—Although increasing age is associated with a decrease in cardiac BRS, dynamic CA, as assessed by step response analysis as well as cerebral blood flow responses to transient and induced BP stimuli, is unaffected by aging.
Key Words: aging • autoregulation • cerebral circulation • ultrasonography, Doppler, transcranial
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