Prenatal Diagnosis of Twin Reversed Arterial Perfusion (Trap) Sequence: A Case Report

Abstract

Twin reversed arterial perfusion (TRAP) sequence is a rare condition of monochorionic twin pregnancy. It has an incidence of 1:35.000 pregnancies and constitutes 1% all monochorionic pregnancies. The etiopathogenetic mechanisms are not well defined. There is co-existence of a normal pump twin and an acardiac recipient twin. A 22-year-old nulliparous woman was referred with TRAP sequence. The prognosis in TRAP sequence is lethal for acardiac twin and the fetal mortality of the pump twin is very high due to the cardiac failure. The obstetrician should be aware of TRAP-sequence in twin/multiple pregnancies.

Keywords

• monochorionic twin pregnancy
• prenatal diagnosis
• sequence
• twin reversed arterial perfusion (trap)