twin reversed arterial perfusion , TRAP (Abkürzung)

One twin may also fail to develop a proper heart and become dependent on the pumping activity of the other twin's heart, resulting in twin reversed arterial perfusion.

The Twin reversed arterial perfusion, or TRAP sequence, results in an acardiac twin, a parasitic twin that fails to develop a head, arms and a heart.

Patients were excluded from the study if the pregnancy was complicated by TTTS, monoamnionicity, intrauterine growth restriction, growth discordance, structural anomalies, or twin reversed arterial perfusion sequence.

Twin reversed arterial perfusion is a rare complication of monochorionic twin pregnancies, involving an acardiac twin whose structural defects are incompatible with life, and an otherwise normal "pump" twin.