Effects of two body positions on carotid artery blood flow velocity and end-tidal carbon dioxide levels during the Valsalva Maneuver in healthy elderly individuals: a research report submitted ... for the degree of Master of Science ...
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15 seconds 40 mmHg arterial carbon dioxide arterial pCC>2 artery blood flow autoregulation baroreceptor baroreflex baseline end-tidal CO2 baseline to strain blood flow velocity body position CABFV and end-tidal CABFV from baseline CABFV from strain carbon dioxide levels carotid artery blood cerebral aneurysm cerebral blood flow cerebrovascular compromise chair position compared change in CABFV common carotid artery differences in CABFV Doppler end-tidal carbon dioxide end-tidal CO2 levels end-tidal CO2 values flat position flow velocity CABFV gender differences Gender Effects healthy elderly individuals hemodynamic response higher CABFV hypertensive internal carotid artery investigators Metzger mmHg nasal cannula normal numbers Nursing percent change perform the Valsalva physiologic predict end-tidal CO2 regression release of strain release value respiratory seconds after strain seconds post strain significantly higher significantly predict end-tidal smoking strain release strain to overshoot subarachnoid hemorrhage supine position systolic blood pressure Therrien Valsalva maneuver values at 15 vasoconstriction