Why the study?
Is cerebrovascular reactivity to CO2 altered among hypertensive adolescents compared to normotensive controls?
Is cerebrovascular reactivity to CO2 altered among hypertensive adolescents compared to normotensive controls?
Hypertensive adolescents exhibit decreased cerebral vasoreactivity compared to healthy controls, suggesting early cerebrovascular alterations.
Reduced cerebrovascular reactivity in hypertensive adolescents may signal early impairment; hypothesis-generating and requires longitudinal validation before clinical use.
BACKGROUND: Adolescent hypertension predicts hypertension and increased cardiovascular morbidity in adulthood. The aim of the present work was to test whether cerebrovascular reactivity to CO2 is altered among hypertensive adolescents. METHODS: From the population-based cohort of the Debrecen Hypertension Study, 113 hypertensive and 58 normotensive adolescents underwent transcranial Doppler measurements at rest and after 30 seconds of breath holding. RESULTS: Systolic, mean, and diastolic blood flow velocities were higher among hypertensive individuals at rest. Taking the absolute blood flow velocity parameters into account, after breath holding, only the pulsatility index was significantly higher in the hypertensive group. The percentage change of the different blood flow parameters showed less intensive change in hypertensive teenagers. CONCLUSION: Cerebral vasoreactivity is decreased among hypertensive individuals as compared to healthy controls.
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Settakis et al. (2003) studied this question.
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