http://www.cnr.it/ontology/cnr/individuo/prodotto/ID62807
Coronary flow reserve in severe aortic valve stenosis: a positron emission tomography study (Articolo in rivista)
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- Coronary flow reserve in severe aortic valve stenosis: a positron emission tomography study (Articolo in rivista) (literal)
- Anno
- 2008-01-01T00:00:00+01:00 (literal)
- Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#doi
- 10.2459/JCM.0b013e328352249d (literal)
- Alternative label
Carpeggiani C.; Neglia D.; Paradossi U.;Pratali L.; Glauber M.; L'Abbate A. (2008)
Coronary flow reserve in severe aortic valve stenosis: a positron emission tomography study
in Journal of cardiovascular medicine (Hagerstown, Md. : Online); Lippincott Williams &Wilkins, Hagerstown (Stati Uniti d'America)
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- Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#autori
- Carpeggiani C.; Neglia D.; Paradossi U.;Pratali L.; Glauber M.; L'Abbate A. (literal)
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- http://journals.lww.com/jcardiovascularmedicine/pages/default.aspx (literal)
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Scuola Superiore S. Anna Pisa (literal)
- Titolo
- Coronary flow reserve in severe aortic valve stenosis: a positron emission tomography study (literal)
- Abstract
- Objectives The purpose was to test whether, in patients
with severe aortic stenosis, impaired myocardial blood flow
reserve is dependent on myocardial hypertrophy and may
improve after valve replacement.
Methods Fifteen patients with severe aortic stenosis,
normal coronary arteries and normal left ventricular systolic
function (ejection fraction >50%) underwent a resting/
dipyridamole (0.56 mg/kg over 4 min) 13N-NH3 flow positron
emission tomography study and a resting 2D-Echo before
and 12 months after (eight patients) surgery. Myocardial
blood flow reserve was defined as dipyridamole/resting
mean myocardial blood flow ratio.
Results Before surgery, the transvalvular maximal pressure
gradient was 86W19mmHg, valve area 0.82W0.24cm2 and
left ventricular mass index 185W37 g/m2. As compared
with a positron emission tomography population of normal
subjects, patients had a normal resting myocardial blood
flow (1.02W0.34 vs. 1.04W0.22, not significant), a
depressed dipyridamole myocardial blood flow (1.58W0.69
vs. 3.67W0.86, P<0.001) and myocardial blood flow reserve
(1.54W0.39 vs. 3.63W0.97, P<0.001). After surgery, left
ventricular mass index decreased (172W47 to 118W40,
P<0.01) but no change was found in resting myocardial
blood flow, dipyridamole myocardial blood flow and
myocardial blood flow reserve. There was no correlation
between flow values and pressure gradient or left
ventricular mass index, before or after valve replacement
and in pooled data from the two studies.
Conclusion In severe aortic stenosis, myocardial blood
flow reserve is depressed independent of myocardial
hypertrophy and transvalvular pressure gradient. Removal
of pressure overload by valve replacement is not able to
improve myocardial perfusion. (literal)
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