from Structural Heart Disease in the Fetus
Published online by Cambridge University Press: 21 October 2019
Unlike other fetal therapies, cardiac interventions have not been tested by randomized controlled trials (RCT), such as the one to determine the optimal management of twin-to-twin transfusion syndrome (TTTS) [1]. Most reports of fetal cardiac interventions have no appropriate control subjects and have resulted in level three evidence at best, so their clinical value and generalizability to the fetal population with obstructive cardiac lesions remain uncertain.
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