T2 fluctuations in ischemic and post-ischemic viable porcine myocardium in vivo.
J Cardiovasc Magn Reson
; 8(3): 469-74, 2006.
Article
em En
| MEDLINE
| ID: mdl-16755833
ABSTRACT
T2 relaxation can augment delayed-enhancement viability imaging because it is sensitive to tissue edema and microcirculatory oxygen state. We demonstrate the T2 'signatures' of sub-lethal ischemia and stunning in porcine myocardium perfused by the distal left anterior descending artery, by imaging during percutaneous balloon occlusion for 25 minutes and subsequent reperfusion (n = 9). Muscle displayed ischemic dysfunction and partial post-ischemic functional recovery (p < or = 0.0004), concommitant with an elevated post-ischemic T2 (deltaT2 = 27 +/- 18%, p = 0.005). TTC staining verified muscle viability. The T2 fluctuations may reflect hyperemia and tissue cellular edema in accord with the known pathophysiology of ischemic and post-ischemic yet viable muscle.
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Coleções:
01-internacional
Base de dados:
MEDLINE
Assunto principal:
Imageamento por Ressonância Magnética
/
Traumatismo por Reperfusão Miocárdica
/
Isquemia Miocárdica
/
Miocárdio Atordoado
Limite:
Animals
Idioma:
En
Revista:
J Cardiovasc Magn Reson
Ano de publicação:
2006
Tipo de documento:
Article