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Hemodynamic response to ramp CO2 stimulus in a 60 year old healthy subject. Note the marked blood pressure and cerebral blood flow velocity response to increased CO2 persisting past the stimulus peak. Legend abbreviations – etPCO2; end-tidal partial pressure of carbon dioxide, MCAv; middle cerebral artery velocity, MAP; mean arterial pressure, HR; heart rate, right and left O2; cerebral O2 saturation.
