title: Invited commentary.
authors.affiliation: Department of Cardiothoracic Surgery, The Royal Melbourne Hospital, PO Box 2135, Parkville, Victoria 3052, 3050, Australia. alistair.royse@mh.org.au
authors.forename: Alistair George
authors.initials: AG
authors.lastname: Royse
mesh_terms: D003251:Constriction, Pathologic / Q000000981:diagnostic imaging / Q000209:etiology; D017023:Coronary Angiography / Q000009:adverse effects; D006801:Humans; D017534:Radial Artery / Q000000981:diagnostic imaging* / Q000502:physiology*; D014463:Ultrasonography