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The use of Doppler blood flow analysis to determine direction of blood flow, post\u2010mortem placental and fetal angiography, and umbilical cord blood gas determination provided proof that retrograde arterial perfusion occurs in the acardiac fetus. In a fourth pregnancy, an experimental approach to occlude the acardiac twin's umbilical cord was attempted, but was unsuccessful.<\/jats:p>","DOI":"10.1002\/pd.1970110405","type":"journal-article","created":{"date-parts":[[2007,3,4]],"date-time":"2007-03-04T05:21:18Z","timestamp":1172985678000},"page":"235-244","source":"Crossref","is-referenced-by-count":30,"title":["The normal fetus of an acardiac twin pregnancy: Perinatal management based on echocardiographic and sonographic evaluation"],"prefix":"10.1002","volume":"11","author":[{"given":"Alan E.","family":"Donnenfeld","sequence":"first","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Johanna","family":"van de Woestune","sequence":"additional","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Frank","family":"Craparo","sequence":"additional","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Catherine S.","family":"Smith","sequence":"additional","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Avi","family":"Ludomirsky","sequence":"additional","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Stuart","family":"Weiner","sequence":"additional","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]}],"member":"311","published-online":{"date-parts":[[2005,11,21]]},"reference":[{"key":"e_1_2_1_2_1","volume-title":"Manual of Fetal Echocardiography","author":"Allan L. 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