( ( ( A ( high level ) ) ( of ( cerebrovascular reactivity ) ) ) ( ( means ( ( ( ( ( blood and ) oxygen ) ( are ( being ( transferred ( to ( ( the brain ) ( in ( an ( optimal manner ) ) ) ) ) ) ) ) ) and ) ( that ( ( carbon dioxide ) ( is ( being ( carried away ) ) ) ) ) ) ) . ) )
(ROOT (S (NP (NP (DT A) (JJ high) (NN level)) (PP (IN of) (NP (NN cerebrovascular) (NN reactivity)))) (VP (VBZ means) (SBAR (SBAR (S (NP (NN blood) (CC and) (NN oxygen)) (VP (VBP are) (VP (VBG being) (VP (VBN transferred) (PP (TO to) (NP (NP (DT the) (NN brain)) (PP (IN in) (NP (DT an) (JJ optimal) (NN manner)))))))))) (CC and) (SBAR (IN that) (S (NP (NN carbon) (NN dioxide)) (VP (VBZ is) (VP (VBG being) (VP (VBN carried) (PRT (RP away))))))))) (. .)))
A high level of cerebrovascular reactivity means blood and oxygen are being transferred to the brain in an optimal manner and that carbon dioxide is being carried away.
(ROOT (S (NP (DT The) (NN brain)) (VP (VBP stem) (S (NP (NP (NN monitor)) (PRN (-LRB- -LRB-) (PRP s) (-RRB- -RRB-))) (NP (NP (DT the) (NN level)) (PP (IN of) (NP (NP (NN carbon) (NN dioxide)) (PP (IN in) (NP (DT the) (NN blood)))))))) (. .)))