(Stroke. 1997;28:1195-1197.)
© 1997 American Heart Association, Inc.
Articles |
From the Department of Internal Medicine 1, S Maria Nuova Hospital, Florence, Italy.
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Methods Forty-eight healthy volunteers underwent monitoring of mV and end-tidal CO2 in the horizontal position and during head-upright tilt.
Results Both mV and end-tidal CO2 significantly decreased in orthostasis (P<.01). Linear regression analysis showed a significant linkage between end-tidal CO2 and mV changes (r=.83, P<.01).
Conclusions Changes in ventilation-perfusion ratio and in the respiratory pattern induced by head-upright tilt can significantly influence TCD data by determining a PCO2 decrease.
Key Words: blood flow velocity carbon dioxide cerebral blood flow hemodynamics ultrasonics
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Received January 14, 1997; revision received March 6, 1997; accepted March 21, 1997.
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