engleski

Breath holding index in the evaluation of cerebral vasoreactivity

The aim of this study was to assess normal values of the middle cerebral artery breath holding index in healthy males and females. Healthy volunteers (180 male and 180 female)were divided into 6 age groups for each sex. All basal cerebral arteries were evaluated by transcranial Doppler in a standardized manner. Brath holding index was calculated as percent of velocity increase from resting baseline values divided by breath holding time. There was no statistically significant decrease in breath holding indey values with age (p>0, 05), however, an age dependent decease in the mean blood flow velocity was recorded in all subjects (p<0, 01). Breath holding index is a nonaggressive, well tolerated, real-time, reproducible screening method to study cerebral hemodynamics.

cerebrovasculsr circulation - physiology; respiration - physiology; blood vessels - ultrasonography

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