O velho PHT da Mitral.

Mitral valve area by the pressure half-time method does not correlate with mean gradient in mitral valve repair patients

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Eur J Echocardiogr (2011) 12 (2):124-130.

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Methods and results Forty-two patients with a repaired mitral valve were identified. Mitral valve area was calculated by both the pressure half-time method and the continuity equation. The two mitral valve areas were then directly compared and also correlated with mean gradient. The two mitral valve areas were significantly different from one another with a mean of 1.81 ± 0.53 cm² by continuity equation and 2.65 ± 0.69 cm² by pressure half-time. The continuity equation correlated well with mean gradient (ρ = −0.63), whereas the correlation for pressure half-time was weak (r = −0.08).

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Conclusion A non-linear, inverse correlation was found between mitral valve area by the continuity equation and mean gradient. No correlation was found between the pressure half-time method for mitral valve area and mean gradient. The continuity equation likely provides a better estimate of mitral valve area in repaired mitral valves.

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The actual burden of iatrogenic mitral stenosis, following a mitral valve repair, is likely related to the aetiology of the mitral insufficiency, the repair strategy employed, and the size of the annuloplasty product implanted. Incorporating this information into the echocardiography report, along with mean gradient and mitral valve area by the continuity equation, will likely provide an improved understanding of the performance of a repaired mitral valve.

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Uma boa pergunta é por que?

Sim, por que após a plastia mitral o PHT passa a funcionar mal?

Já sabemos que para próteses, o PHT também não é eficiente.

Será que a abordagem do anel mitral mexe com a curva de enchimento ventricular e altera o PHT...

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