Twin Reversed Arterial Perfusion Sequence (TRAP Sequence)

Twin reversed arterial perfusion sequence (TRAP sequence) occurs when one twin, lacking a functioning cardiac system, receives blood from the normally developing “pump twin” in a monochorionic pregnancy. This places an enormous demand on the heart, putting the pump twin at risk for cardiac failure. Left untreated, the pump twin will die in 50 percent to 75 percent of cases. At CHOP, TRAP sequence can be treated in utero using selective bipolar cord coagulation and radiofrequency ablation (RFA) procedures.

Twin Reversed Arterial Perfusion (TRAP) Sequence: Taylor's Story

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