Twin reversed arterial perfusion (TRAP) is a rare condition of monochorionic (identical) twin pregnancies. It occurs when the cardiac system of one twin does the work of supplying blood for both fetuses. The twin supplying the blood is known as the "pump twin" and develops normally. However, the increased pumping of the heart puts it at risk for cardiac failure. The other twin — known as the “acardiac twin” — lacks a heart or has an un-deformed heart.
The blood flowing to the acardiac twin is reversed, which hinders proper development. Because the acardiac twin fails to fully develop vital organs, survival outside of the womb is not possible without intervention.
Twin Reversed Arterial Perfusion: What You Need to Know
- We understand the urgency involved with treating a fetus with a diagnosis of TRAP. Our care team is available to take your call at any time and will see you as soon as possible.
- The Center for Fetal Therapy team may use a fetal echocardiogram to evaluate the heart health of the normally developing pump twin.
- If the acardiac twin is threatening the life of the normally developing twin, then fetal therapy or intervention is recommended.
- Fetal interventions focus on monitoring the heart health of the pump twin and include procedures to stop blood flow to the acardiac twin.
Rely on the expertise of our physicians to help you manage TRAP.
Joint Appointment in Surgery
Director, Center for Fetal Therapy
Assistant Professor of Surgery
Associate Professor of Gynecology and Obstetrics
Director of Obstetric Anesthesia