end-tidal

adjective

ˈend-ˌtīd-ᵊl 

: of or relating to the last portion of expired tidal air

End-tidal carbon dioxide monitors are already being used and are recommended to indicate the adequacy of cardiopulmonary resuscitation and the likelihood of a successful resuscitation.

—Mickey S. Eisenberg and Terry J. Mengert, The New England Journal of Medicine