%0 Journal Article
%T Eficacia de la relaci¨®n gradiente pico-gradiente medio para el diagn¨®stico de la gravedad de la estenosis a¨®rtica
%A Volberg
%A Ver¨®nica I.
%A Berensztein
%A Clotilde S.
%A Ber
%A Marcos G.
%A Lanosa
%A Gustavo
%A Lerman
%A Jorge
%A Pi£¿eiro
%A Daniel J.
%J Revista argentina de cardiolog£¿-a
%D 2006
%I Scientific Electronic Library Online
%X the aim of the present study was to evaluate the statistical efficacy of peak to mean pressure decrease ratio (gmax/ gmed) for the assessment of aortic stenosis severity. we studied the echocardiograms of 212 consecutive patients (mean age: 74 years; range: 19-98 years; 100 males [47%]) with an aortic area calculated by the continuity equation (aao) of 2 cm2. we considered severe aortic stenosis: a maximal aortic velocity (vmax) 4 m/s, a mean gradient (gmed) 40 mmhg or an aao of 1 cm2. we also performed the analysis taking an aao 0.75 cm2 as severe aortic stenosis. we conclude that: 1) gmax/ gmed ratio is directly but weakly correlated; 2) there is a great overlap among gmax/ gmed ratio values corresponding to patients with different aortic stenosis severity; 3) the sensitivity, specificity and accuracy of gmax/ gmed ratio for the diagnosis of severe aortic stenosis are of average magnitude; 4) the positive and negative predictive values of gmax/ gmed ratio are modest, in the studied population; 5) the analysis of likelihood ratios demonstrated that gmax/ gmed ratio has only a small clinical impact for the diagnosis of severe aortic stenosis; 6) more studies are needed before accepting gmax/ gmed ratio as a useful clinical parameter for the diagnosis of severe aortic stenosis. the gmax/ gmed ratio could be a surrogate criterion for aao when it is not possible to assess all the variables needed for its calculation.
%K aortic stenosis
%K echocardiography
%K doppler.
%U http://www.scielo.org.ar/scielo.php?script=sci_abstract&pid=S1850-37482006000300007&lng=en&nrm=iso&tlng=en