abscessacuteanesthesiaaorticarrestarthrocentesiscardiaccarotidchestcollapsecoviddaydiameterdopplerearlyechoemembolismevidencefailurefemoralfocusedguidedheartinclusioninjectionsinjuryivclivelungmanifestonervenotchingopticpainpediatricpeopleperitonsillarpocuspointprogresspulmonaryregionalresearchsheathsystolictriggertubeusvexusyale