 comparison central aortic peripher arteri pressur curv brachial arteri central aortic pressur compar 50 consecut patient subject retrograd left heart catheter order re-emphas fact pressur ident 43 case system systol pressur peak exceed central aorta pressur equal averag pressur differ 22 6 mm hg greatest differ occur case aortic regurgit extrem brachial arteri systol pressur exceed aorta 100 mm hg instanc differ occur case aortic stenosi differ occasion exist lead erron estim valv orific size system aortic systol pressur 