Journal of the Medical Association of Thailand Vol 90, No 4:APRIL 2007 0125-2208 90 4 2007 Jan TRAP Sequence in an Acardiac Twin 819 EN Athita Chanthasenanont Densak Pongrojpaw Case Report Expectant management with close antepartum surveillance deserves consideration in cases of monozygotic twins with TRAP sequence. Neonatal mortality of the pump twin diagnosed antenatally may be considerably less than reported. Acardiac twin TRAP sequence Fetal heart failure