Abstract
Introduction: TRAP syndrome (Twin Reversed Arterial Perfusion) is a rare complication of monochorionic twins with an incidence of 1:100 in monozygotic twins and 1:35,000 in all pregnancies. One of the twins lacks cardiac function (acardiac) but grows slowly receiving blood from the healthy twin through arterio-arterial anastomoses. The risk of death for the fetus-donor is high (50%) due to cardiac insufficiency, and in 33% demise happens <16th week of gestation. There is also increased risk of premature delivery (25%). Prenatal intervention with the use of interstitial laser aims to interrupt blood flow internally in the acardiac twin and outcome is significantly improved if performed at the first trimester of pregnancy.
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