Minimally invasive management of twin reversed arterial perfusion sequence (TRAP)

Fetal and Maternal Medicine Review

Volumn 17, Issue 1, 2006, Pages 1-22

  Sebire, N J ^a   Wong, A E ^b   Sepulveda, W ^b  

^a GREAT ORMOND STREET HOSPITAL   (United Kingdom)

^b CLÍNICA LAS CONDES   (Chile)

Author keywords

[No Author keywords available]

Indexed keywords

ALCOHOL; INDOMETACIN; INOTROPIC AGENT; SCLEROSING AGENT;

ACARDIUS; AMNIOCENTESIS; ARTERY PERFUSION; BLOOD VESSEL OCCLUSION; DIATHERMY; ENDOSCOPIC THERAPY; FETOSCOPY; FETUS ECHOGRAPHY; FETUS MALFORMATION; HUMAN; LASER COAGULATION; MINIMALLY INVASIVE SURGERY; PATHOPHYSIOLOGY; PRENATAL DIAGNOSIS; PROGNOSIS; RADIOFREQUENCY ABLATION; REVIEW; SCLEROTHERAPY; THERMOCOAGULATION; TRAP SEQUENCE; TWIN PREGNANCY;

EID: 33646044332     PISSN: 09655395     EISSN: None     Source Type: Journal    
DOI: 10.1017/S0965539505001683     Document Type: Review

References (123)

1. Van Allen MI, Smith DW, Shepard TH. Twin reversed arterial perfusion (TRAP) sequence: a study of 14 twin pregnancies with acardius. Semin Perinatol 1983; 7: 285-93.
2. Moore TR, Gale S, Benirschke K. Perinatal outcome of forty nine pregnancies complicated by acardiac twinning. Am J Obstet Gynecol 1990; 163: 907-12.
3. Fusi L, Fisk N, Talbert D, Gau G, Rodeck C. When does death occur in an acardiac twin? Ultrasound diagnostic difficulties. J Perinat Med 1990; 18: 223-27.
4. Napolitani FD, Schreiber I. The acardiac monster. A review of the world literature and presentation of 2 cases. Am J Obstet Gynecol 1960; 80: 582-89.
5. James WH. A note on the epidemiology of acardiac monsters. Teratology 1977; 16: 211-16.
6. Healey MG. Acardia: predictive risk factors for the co-twin's survival. Teratology 1994; 50: 205-13.
7. Chanoufi MB, Ben Temime R, Masmoudi A, Ounaissa K, Jebnoun S, Abid W et al. Clinical and anatomic features of acardiac twins. Med Princ Pract 2004; 13: 375-79.
8. Benirschke K, Kaufmann P. Pathology of the Human Placenta. 2nd edition. New York:Springer, 1995; 702-10.
9. Abboud P, Garnier R, Mansour G, Gabriel R, Gaillard D, Quereux C. Acardiac fetus in a triplet pregnancy: ultrasound pitfalls. A case report. Eur J Obstet Gynecol Reprod Biol 2000; 89: 75-80.
10. Bolaji II, Mortimer G, Meehan FP, England S, Greally M. Acardius in a triplet pregnancy: cytogenetic and morphological profile. Acta Genet Med Gemellol 1992; 41: 27-32.
11. Chang DY, Chang RY, Chen RJ, Chen CK, Chen WF, Huang SC. Triplet pregnancy complicated by intrauterine fetal death of conjoined twins from an umbilical cord accident of an acardius. A case report. J Reprod Med 1996; 41: 459-62.
12. Dahiya P, Agarwal U, Sangwan K, Sen J. Antenatal diagnosis of twin-reversed arterial perfusion sequence (acardiac amorphous) in a triplet pregnancy: case report. Arch Gynecol Obstet 2004; 269: 147-48.
13. Landy HJ, Larsen JW, Schoen M, Larsen ME, Kent SG, Weingold AB. Acardiac fetus in a triplet pregnancy. Teratology 1988; 37: 1-6.
14. Loh SF, Tee CS, Chew SY. Acardiac anomaly. Int J Gynaecol Obstet 1994; 45: 153-57.
15. Sanjaghsaz H, Bayram MO, Qureshi F. Twin reversed arterial perfusion sequence in conjoined, acardiac, acephalic twins associated with a normal triplet. A case report. J Reprod Med 1998; 43: 1046-1050.
16. Sogaard K, Skibsted L, Brocks V. Acardiac twins: pathophysiology, diagnosis, outcome and treatment. Fetal Diagn Ther 1999; 14: 53-59.
17. Buntinx IM, Bourgeois N, Buytaert PM, Dumon JE. Acardiac amorphous twin with prune belly sequence in the co-twin. Am J Med Genet 1991; 39: 453-57.
18. Genest DR, Lage JM. Absence of normal-appearing proximal tubules in the fetal and neonatal kidney: prevalence and significance. Hum Pathol 1991; 22: 147-53.
19. Habbal OA, Kenue RK, Venugopalan P. Acardia syndrome coexisting with gastroschisis in the co-twin. Clin Dysmorphol 2005; 14: 45-47.
20. Popek EJ, Strain JD, Neumann A, Wilson H. In utero development of pulmonary artery calcification in monochorionic twins: a report of three cases and discussion of the possible etiology. Pediatr Pathol 1993; 13: 597-11.
21. Chen CP, Shih SL, Liu FF, Jan SW, Lin YN, Lan CC. Skeletal deformities of acardius anceps: the gross and imaging features. Pediatr Radiol 1997; 27: 221-25.
22. Chi JG. Acardiac twins - an analysis of 10 cases. J Korean Med Sci 1989; 4: 203-16.
23. Gimenez-Scherer JA, Davies BR. Malformations in acardiac twins are consistent with reversed blood flow: liver as a clue to their pathogenesis. Pediatr Dev Pathol 2003; 6: 520-30.
24. Laure-Kamionowska M, Maslinska D, Deregowski K, Piekarski P, Raczkowska B. Effects of ischaemia and hypoxia on the development of the nervous system in acardiac foetus. Folia Neuropathol 2004; 42: 227-33.
25. Morizane M, Ohara N, Mori T, Murao S. Neuropathological features of the brain in acardius acormus. J Perinat Med 2002; 30: 269-72.
26. Sergi C, Schmitt HP. Central nervous system in twin reversed arterial perfusion sequence with special reference to examination of the brain in acardius anceps. Teratology 2000; 61: 284-90.
27. Petersen BL, Broholm H, Skibsted L, Graem N. Acardiac twin with preserved brain. Fetal Diagn Ther 2001; 16: 231-33.
28. Ersch J, Stallmach T. Cardiac regression sequence: reversal of blood flow is diagnostic but not causative in an acardiac fetus. Early Hum Dev 1998; 52: 81-85.
29. Nerlich A, Wisser J, Draeger A, Nathrath W, Remberger K. Human acardiac anomaly: a report of three cases. Eur J Obstet Gynecol Reprod Biol 1991; 38: 79-85.
30. Park HW, Kapur RP, Shepard TH. Reversed circulation in acardiac fetuses is associated with anatomic inversions in the aortic wall. Teratology 1994; 49: 267-72.
31. Wong AE, Sepulveda W. Acardiac anomaly: current issues in prenatal assessment and treatment. Prenat Diagn 2005; 25: 796-806.
32. Moore CA, Buehler BA, McManus BM, Harmon JP, Mirkin LD, Goldstein DJ. Acephalus-acardia in twins with aneuploidy. Am J Med Genet 1987; 3: 139-43.
33. Blaicher W, Repa C, Schaller A. Acardiac twin pregnancy: associated with trisomy 2: case report. Hum Reprod 2000; 15: 474-75.
34. Chaliha C, Schwarzler P, Booker M, Battash MA, Ville Y. Trisomy 2 in an acardiac twin in a triplet in-vitro fertilization pregnancy. Hum Reprod 1999; 14: 1378-380.
35. Fisk NM, Ware M, Stanier P, Moore G, Bennett P. Molecular genetic etiology of twin reversed arterial perfusion sequence. Am J Obstet Gynecol 1996; 174: 891-94.
36. Aggarwal N, Suri V, Saxena S, Malhotra S, Vasishta K, Saxena AK. Acardiac acephalus twins: a case report and review of literature. Acta Obstet Gynecol Scand 2002; 81: 983-84.
37. Borrell A, Pesarrodona A, Puerto B, Deulofeu P, Fuster JJ, Fortuny A. Ultrasound diagnostic features of twin reversed arterial perfusion sequence. Prenat Diagn 1990; 10: 443-48.
38. Cardwell MS. The acardiac twin. A case report. J Reprod Med 1988; 33: 320-22.
39. Chandra S, Crane JM, Young DC, Shah S. Acardiac twin pregnancy with neonatal resolution of donor twin cardiomyopathy. Obstet Gynecol 2000; 96: 820-21.
40. Chmait R, Hull A. Placental pathology casebook. Unusually large acardiac twin pregnancy at term. J Perinatol 2001; 21: 150-52.
41. Comerford JA. An acardiac twin. Aust N Z J Obstet Gynaecol 1991; 31: 184-86.
42. Erkaya S, Kutlay B, Kara F, Uygur D, Bebitoglu I. Acardiac twinning where the pump twin dies in utero due to thrombosis in the umbilical arteries. Eur J Obstet Gynecol Reprod Biol 2000; 90: 51-54.
43. Imai A, Hirose R, Kawabata I, Tamaya, T. Acardiac acephalic monster extremely larger than its co-twin. A case report. Gynecol Obstet Invest 1991; 32: 62-64.
44. Langlotz H, Sauerbrei E, Murray S. Transvaginal Doppler sonographic diagnosis of an acardiac twin at 12 weeks gestation. J Ultrasound Med 1991; 10: 175-79.
45. Ozuysal S, Yerci O, Uncu G, Filiz G. Acardiac fetus: a case report. Clin Exp Obstet Gynecol 1999; 24: 169-70.
46. Pratibha D, Sagar DV, Suvarchala P. Acardiac acephalic twin causing obstructed labour. J Indian Med Assoc 1995; 93: 210.
47. Rajangam S, Mohan C, Thomas IM. Acardiac anceps. Indian Heart J 1999; 51: 86-87.
48. Rajesh B, Mahadhevan B, Rao S, Bhat VB. Acephalus acardiac fetus. Indian J Pediatr 2004; 71: 948.
49. Sohi I, Chacko B, Masih K, Choudhary S. A case of TRAP sequence: acardiac twin. Indian J Pathol Microbiol 2003; 46: 664-65.
50. Stiller RJ, Romero R, Pace S, Hobbins JC. Prenatal identification of twin reversed arterial perfusion syndrome in the first trimester. Am J Obstet Gynecol 1989; 160: 1194-196.
51. Veridiano NP, Fresko O, Chervenak FA. Antenatal diagnosis of acardiac, acephalic twin. Int J Gynaecol Obstet 1989; 30: 179-83.
52. Wenstrom KD. Midtrimester selective delivery of an acardiac twin. Am J Obstet Gynecol 1993; 168: 1647.
53. Lehr C, DiRe J. Rare occurrence of a holoacardious acephalic monster: sonographic and pathologic findings. J Clin Ultrasound 1978; 6: 259-61.
54. Porreco RP, Barton SM, Haverkamp AD. Occlusion of umbilical artery in acardiac, acephalic twin. Lancet 1991; 337: 326-27.
55. Shalev E, Zalel Y, Ben-Ami M, Weiner E. First-trimester ultrasonic diagnosis of twin reversed arterial perfusion sequence. Prenat Diagn 1992; 12: 219-22.
56. Zucchini S, Borghesani F, Soffriti G, Chirico C, Vultaggio E, Di Donato P. Transvaginal ultrasound diagnosis of twin reversed arterial perfusion syndrome at 9 weeks' gestation. Ultrasound Obstet Gynecol 1993; 3: 209-11.
57. Bonilla-Musoles F, Machado LE, Raga F, Osborne NG. Fetus acardius: two- and three-dimensional ultrasonographic diagnoses. J Ultrasound Med 2001; 20: 1117-127.
58. Sepulveda WH, Quiroz VH, Giuliano A, Henriquez R. Prenatal ultrasonographic diagnosis of acardiac twin. J Perinat Med 1993; 21: 241-46.
59. Sebire NJ, Sepulveda W, Jeanty P, Nyberg DA, Nicolaides KH. Multiple gestations. In Diagnostic Imaging of Fetal Anomalies, Nyberg DA, McGahan JP, Pretorius DH, Pilu G (eds). Lippincott William & Wilkins: Philadelphia, PA,2003; 777-813.
60. Pretorius DH, Leopold GR, Moore TR, Benirschke K, Sivo JJ. Acardiac twin. Report of Doppler sonography. J Ultrasound Med 1988; 7: 413-16.
61. Benson CB, Bieber FR, Genest DR, Doubilet PM. Doppler demonstration of reversed umbilical blood flow in an acardiac twin. J Clin Ultrasound 1989; 17: 291-95.
62. Sherer DM, Armstrong B, Shah YG, Metlay LA, Woods JR. Prenatal sonographic diagnosis, Doppler velocimetric umbilical cord studies, and subsequent management of an acardiac twin pregnancy. Obstet Gynecol 1989; 74: 472-75.
63. Crade M, Nageotte MP, MacKenzie ML. The acardiac twin: a case report using color Doppler ultrasonography. Ultrasound Obstet Gynecol 1992; 2: 364-65.
64. Fouron JC, Leduc L, Grigon A, Maragnes P, Lessard M, Drblik SP. Importance of meticulous ultrasonographic investigation of the acardiac twin. J Ultrasound Med 1994; 13: 1001-1004.
65. Al Malt A, Ashmead G, Judge N, Mann L, Ashmead J, Stepanchak W. Color-flow and Doppler velocimetry in prenatal diagnosis of acardiac triplet. J Ultrasound Med 1991; 10: 341-45.
66. Donnenfeld AE, van de Woestijne J, Craparo F, Smith CS, Ludomirsky A, Weiner S. The normal fetus of an acardiac twin pregnancy: perinatal management based on echocardiographic and sonographic evaluation. Prenat Diagn 1991; 11: 235-44.
67. Hecher K, Ville Y, Nicolaides KH. Color Doppler ultrasonography in the identification of communicating vessels in twin-twin transfusion syndrome and acardiac twins. J Ultrasound Med 1995; 14: 37-40.
68. Ishimatsu J, Nakanami H, Hamada T, Yakushiji M. Color and pulsed Doppler ultrasonography of reversed umbilical blood flow in an acardiac twin. Asia Oceania J Obstet Gynaecol 1993; 19: 271-75.
69. Kirkinen P, Herva R, Rasanen J, Airaksinen J, Ikaheimo M. Documentation of paradoxical umbilical blood supply of an acardiac twin in the antepartum state. J Perinat Med 1989; 17: 63-65.
70. Osborn P, Gross TL, Shah JJ, Ma L. Prenatal diagnosis of fetal heart failure in twin reversed arterial perfusion syndrome. Prenat Diagn 2000; 20: 615-17.
71. Papa T, Dao A, Bruner JP. Pathognomonic sign of twin reversed arterial perfusion using color Doppler sonography. J Ultrasound Med 1997; 16: 501-503.
72. Schwarzler P, Ville Y, Moscoso G, Tennstedt C, Bollmann R, Chaoui R. Diagnosis of twin reversed arterial perfusion sequence in the first trimester by transvaginal color Doppler ultrasound. Ultrasound Obstet Gynecol 1999; 13: 143-46.
73. Dashe JS, Fernandez CO, Twickler DM. Utility of Doppler velocimetry in predicting oucome in twin reversed-arterial perfusion sequence. Am J Obstet Gynecol 2001; 185: 135-39.
74. Meyberg H, Gross C. Increased nuchal translucency and pathological ductus venosus flow: two cases of TRAP sequence with different outcomes. Ultrasound Obstet Gynecol 2002; 20: 72-74.
75. Labadie G, David N, Herveau C. Prognostic value of nuchal translucency and ductus venosus Doppler in TRAP sequence. Ultrasound Obstet Gynecol 2003; 21: 306-307.
76. Shih JC, Shyu MK, Hunag SF, Jou HJ, Su YN, Hsieh FJ. Doppler waveform analysis of the intertwin blood flow in acardiac pregnancy: implications for pathogenesis. Ultrasound Obstet Gynecol 1994; 14: 375-79.
77. Brassard M, Fouron JC, Leduc L, Grignon A, Proulx F. Prognostic markers in twin pregnancies with an acardiac fetus. Obstet Gynecol 1999; 94: 409-14.
78. Sullivan AE, Varner MW, Ball RH, Jackson M, Silver RM. The management of acardiac twins: a conservative approach. Am J Obstet Gynecol 2003; 189: 1310-313.
79. Goh A, Loke HL, Tan KW. The 'TRAP' sequence-life threatening consequences to the pump twin. Singapore Med J 1994; 35: 329-31.
80. Weisz B, Peltz R, Chayen B, Oren M, Zalel Y, Achiron R et al. Tailored management of twin reversed arterial perfusion (TRAP) sequence. Ultrasound Obstet Gynecol 2004; 23: 451-55.
81. Jolly M, Taylor M, Rose G, Govender L, Fisk NM. Interstitial laser: a new surgical technique for twin reversed arterial perfusion sequence in early pregnancy. BJOG 2001; 108: 1098-102.
82. Arias F, Sunderji S, Gimpelson R, Colton E. Treatment of acardiac twinning. Obstet Gynecol 1998; 91: 818-81.
83. Tan TYT, Sepulveda W. Acardiac twin: a systematic review of minimally invasive treatment modalities. Ultrasound Obstet Gynecol 2003; 22: 409-19.
84. Sepulveda W, Sebire NJ. Acardiac twin: too many invasive treatment options-the problem and not the solution. Ultrasound Obstet Gynecol 2004; 24: 387-89.
85. Simpson PC, Trudinger BJ, Walker A, Baird PJ. The intrauterine treatment of fetal cardiac failure in a twin pregnancy with an acardiac, acephalic monster. Am J Obstet Gynecol 1983; 147: 842-44.
86. Ash K, Harman CR, Gritter H. TRAP sequence - successful outcome with indomethacin treatment. Obstet Gynecol 1990; 76: 960-62.
87. Platt LD, DeVore GR, Bieniarz A, Benner P, Rao R. Antenatal diagnosis of acephalus acardia: a proposed management scheme. Am J Obstet Gynecol 1983; 146: 857-59.
88. Robie GF, Payne GG, Morgan MA. Selective delivery of an acardiac, acephalic twin. N Engl J Med 1989; 320: 512-13.
89. Fries MH, Goldberg JD, Golbus MS. Treatment of acardiacacephalus twin gestations by hysterotomy and selective delivery. Obstet Gynecol 1992; 79: 601-604.
90. Ginsberg NA, Applebaum M, Rabin SA, Caffarelli MA, Kuuspalu M, Daskal JL et al. Term birth after midtrimester hysterotomy and selective delivery of an acardiac twin. Am J Obstet Gynecol 1992; 167: 33-37.
91. Hamada H, Okane M, Koresawa M, Kubo T, Iwasaki H. Fetal therapy in utero by blockage of the umbilical blood flow of acardiac monster in twin pregnancy. Nippon Sanka Fujinka Gakkai Zasshi 1989; 41: 1803-809.
92. Holzgreve W, Tercanli S, Krings W, Schuierer G. A simpler technique for umbilical-cord blockade of an acardiac twin. N Engl J Med 1994; 331: 56-57.
93. Holmes A, Jauniaux E, Rodeck C. Monopolar thermocoagulation in acardiac twinning. BJOG 2001; 108: 1000-1002.
94. Chao AS, Hsieh CC, Liou JD, Soong YK. Application of monopolar thermocoagulation in an acardiac fetus. Prenat Diagn 2002; 22: 499-500.
95. Chang PJ, Liou JD, Hsieh CC, Chao AS, Soong YK. Monopolar thermocoagulation in the management of acardiac twins. Fetal Diagn Ther 2004; 19: 271-74.
96. Deprest JA, Audibert F, Van Schoubroeck D, Hecher K, Mahieu-Caputo D. Bipolar coagulation of the umbilical cord in complicated monochorionic twin pregnancy. Am J Obstet Gynecol 2000; 182: 340-45.
97. Nicolini U, Poblete A, Boschetto C, Bonati F, Roberts A. Complicated monochorionic twin pregnancies: experience with bipolar cord coagulation. Am J Obstet Gynecol 2001; 185: 703-707.
98. McCurdy CM, Childers JM, Seeds JW. Ligation of the umbilical cord of an acardiac-acephalus twin with an endoscopic intrauterine technique. Obstet Gynecol 1993; 82: 708-11.
99. Willcourt RJ, Naughton MJ, Knutzen VK, Fitzpatrick C. Laparoscopic ligation of the umbilical cord of an acardiac fetus. J Am Assoc Gynecol Laparosc 1995; 2: 319-21.
100. Quintero RA, Reich H, Puder KS, Bardicef M, Evans MI, Cotton DB et al. Brief report: umbilical-cord ligation of an acardiac twin by fetoscopy at 19 weeks of gestation. N Engl J Med 1994; 330: 469-71.
101. Ville Y, Hyett JA, Vandenbussche FP, Nicolaides KH. Endoscopic laser coagulation of umbilical cord vessels in twin reversed arterial perfusion sequence. Ultrasound Obstet Gynecol 1994; 4: 396-98.
102. Hecher K, Hackeloer BJ, Ville Y. Umbilical cord coagulation by operative microendoscopy at 16 weeks' gestation in an acardiac twin. Ultrasound Obstet Gynecol 1997; 10: 130-32.
103. Quintero RA, Munoz H, Pommer R, Diaz C, Bornick PW, Allen MH. Operative fetoscopy via telesurgery. Ultrasound Obstet Gynecol 2002; 20: 390-91.
104. Deprest JA, Evrard VA, Van Schoubroeck D, Vandenberghe K. Endoscopic cord ligation in selective feticide. Lancet 1996; 348: 890-91.
105. Sepulveda W, Bower S, Hassan J, Fisk NM. Ablation of acardiac twin by alcohol injection into the intra-abdominal umbilical artery. Obstet Gynecol 1995; 86: 680-81.
106. Tongsong T, Wanapirak C, Sirichotiyakul S, Chanprapaph P. Intrauterine treatment for an acardiac twin with alcohol injection into the umbilical artery. J Obstet Gynaecol Res 2002; 28: 76-79.
107. Ozeren S, Caliskan E, Corakci A, Ozkan S. Unsuccessful management of acardiac fetus with intrafetal alcohol injection. Ultrasound Obstet Gynecol 2004; 24: 473-74.
108. Sepulveda W, Corral E, Aiello H, Otano L, Paredes R, Escobar MF et al. Intrafetal alcohol chemosclerosis of acardiac twins: a multicenter experience. Fetal Diagn Ther 2004; 19: 448-52.
109. Heredia F, Quiroz V. TRAP sequence, embolization. http://www.thefetus.net/page.php?id=1000. 2002.
110. Gul A, Cebeci A, Yildirim G, Aslan H, Ceylan Y. Successful intrauterine treatment with alcohol ablation in a case of acardiac twin pregnancy. J Perinatol 2005; 25: 352-55.
111. Soothill P, Sohan K, Carroll S, Kyle P. Ultrasound-guided, intraabdominal laser to treat acardiac pregnancies. BJOG 2002; 109: 352-54.
112. Sepulveda W, Hasbun J, Dezerega V, Devoto JC, Alcalde JL. Successful sonographically-guided laser ablation of a large acardiac twin at 26 weeks' gestation. J Ultrasound Med 2004; 23: 1663-666.
113. Tsao K, Feldstein VA, Albanese CT, Sandberg PL, Lee H, Harrison MR et al. Selective reduction of acardiac twin by radiofrequency ablation. Am J Obstet Gynecol 2002; 187: 65-640.
114. Hirose M, Murata A, Kita N, Aotani H, Takebayashi K, Noda Y. Successful intrauterine treatment with radiofrequency ablation in a case of acardiac twin pregnancy complicated with a hydropic pump twin. Ultrasound Obstet Gynecol 2004; 23: 509-12.
115. Baldwin VJ. Pathology of Multiple Pregnancy. Springer-Verlag, New York, 1994; 277-349.
116. Deprest JA, Van Ballaer PP, Evrard VA, Peers KH, Spitz B, Steegers EA et al. Experience with fetoscopic cord ligation. Eur J Obstet Gynecol Reprod Biol 1998; 81: 157-64.
117. Galinkin JL, Gaiser RR, Cohen DE, Crombleholme TM, Johnson M, Kurth CD. Anesthesia for fetoscopic fetal surgery: twin reversed arterial perfusion sequence and twin-twin transfusions syndrome. Anesth Analg 2000; 91: 1394-397.
118. Porreco RP. Percutaneous ultrasonographically guided ablation of an acardiac twin. Am J Obstet Gynecol 2004; 190: 572-74.
119. Roberts RM, Shah DM, Jeanty P, Beattie JF. Twin, acardiac, ultrasound-guided embolization. http://www.thefetus.net/page.php?id=307. 1991.
120. Grab D, Schneider V, Keckstein J, Terinde R. Twin, acardiac, outcome. http://www.thefetus.net/page.php?id=312. 1992.
121. Foley MR, Clewell WH, Finberg HJ, Mills MD. Use of the Foley Cordostat grasping device for selective ligation of the umbilical cord of an acardiac twin: a case report. Am J Obstet Gynecol 1995; 172: 212-14.
122. Tanawattanacharoen S, Tantivatana J, Charoenvidhya D, Wisawasukmongchol W, Uerpairojkit B, Wacharaprechanont T. et al. Occlusion of umbilical artery using a Guglielmi detachable coil for the treatment of TRAP sequence. Ultrasound Obstet Gynecol 2002; 19: 313-15.
123. Gallot D, Laurichesse H, Lemery D. Selective feticide in monochorionic twin pregnancies by ultrasound-guided umbilical cord occlusion. Ultrasound Obstet Gynecol 2003; 22: 484-88.