Monozygotic Monoamniotic Acardiac Twin: A TRAP? - IJRCOG Jul
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"Twin reversed-arterial-perfusion (TRAP) sequence is a rare and serious complication of monochorionic twin gestation. It occurs due to abnormal placental arterioarterial
anastomosis also often accompanied by a vein-to vein shunt. “Reversed perfusion” is a term used to describe this scenario because blood enters the acardiac twin through reversed flow through its umbilical artery and exits through the Umbilical vein, which is opposite to
the normal blood supply of the fetus. The acardiac twin loses direct vascular connection with the placental villi and receives its entire blood supply from the pump twin. Mortality rate of acardiac twin is 100%. Here we report a case of unexpected occurrence of acardiac twin diagnosed as monozygotic monoamniotic twin (MCMA) gestation with single foetal demise due to multiple anomalies, delivered vaginally suggesting a role for expectant management."....

http://www.ijrcog.org/index.php/ijrcog/article/view/2813/2519
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