简介:1997).Whetherthisrepresentsatrueincreasedincidenceisunclear.Aneurysmstypicallybecomesymptomaticinpeopleaged40-60years,withthepeakincidenceofSAHoccurringinpeopleaged55-60years(Greenberg,intentionalhypotensiontechniqueandcentrallinesarelessneededsinceexcessiveintroperativebloodlossbecomelessfrequent.However