Mês: julho 2023

Refluxo para o Átrio não é um alívio

Beto Matos-Souza

The model (shown in figure 1) indicates that impedance to retrograde flow is substantially higher than the impedance to forward flow in mild and moderate MR (ie, regurgitant fraction <50%). At a regurgitant fraction of 57%, the ratio of retrograde to forward impedance is one, indicating that the impedance to retrograde flow is equal to that of forward flow. At higher regurgitant fractions (ie, >57%), the ratio falls below one, indicating that the impedance to retrograde flow is less than that to forward flow.

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Assim, é enganador descrever a fisiopatologia da RM como “uma fuga de baixa impedância para a aurícula esquerda”.