10 About permissive hypercapnia : physiology and clinical recommendations ARF section Introduction by the moderators : Mariangela Pellegrini & Leo Heunks Permissive hypercapnia in patient with right heart failure / PHT by Jean-Louis Teboul Permissive hypercapnia in TBI by Chiara Robba Permissive hypercapnia in the pregnant patient by Luigi Camporota