References
- Stiller R J, Haynes de Regt R, Blair E. Transvaginal ultrasonography in patients at risk for ectopic pregnancy. Am J Obstet Gynecol 1989; 161: 930–3
- Funk A, Fendel H. Verbesserte Diagnostik der Extrau-teringraviditat durch die Endosonographie. Z Ge-burtsh u Perinat 1988; 192: 49–53
- Bernaschek G, Rudelstorfer R, Csaicsich P. Vaginal sonography versus serum human chorionic gonadotropin in early detection of pregnancy. Am J Obstet Gynecol 1988; 158: 608–12
- Fossum G T, Davajan V, Kletzky O A. Early detection of pregnancy with transvaginal ultrasound. Fertil Steril 1988; 49: 788–91
- Dimitry E S, Subak-Sharpe R, Mills M, Margara R, Winston R. Nine cases of heterotopic pregnancies in 4 years of in vitro fertilization. Fertil Steril 1990; 53: 107–10
- Braunstein G D, Karow W G, Gentry W C, Rasor J, Wade M E. First trimester chorionic gonadotropin measurements as an aid in the diagnosis of early pregnancy disorders. Am J Obstet Gynecol 1978; 131: 25–32
- Batzer F R, Schlaff S, Goldfarb A F, Corson S L. Serial β-subunit human chorionic gonadotropin doubling time as a prognosticator of pregnancy outcome in an infertile population. Fertil Steril 1981; 35: 307–12
- Lindblom B, Hahlin M, Sjöblom P. Serial human chorionic gonadotropin determinations by fluoroimmu-noassay for differentiation between intrauterine and ectopic gestation. Am J Obstet Gynecol 1989; 161: 397–400
- Bangham D R, Storring P L. Standardisation of hCG, hCG subunits and pregnancy tests. Lancet 1982; i: 390
- Pittaway D E. β-hCG dynamics in ectopic pregnancy. Clinical Obstet Gynecol 1987; 30: 129–35
- Pittaway D E, Wentz A C, Maxson W S, Herbert C, Daniell J, Fleischer A C. The efficacy of early pregnancy monitoring with serial chorionic gonadotropin determinations and real-time sonography in an infertility population. Fertil Steril 1985; 44: 190–4
- Jouppila P, Tapanainen J, Huhtaniemi I. Plasma hCG and ultrasound in suspected ectopic pregnancy. Eur J Obstet Gynecol Reprod Biol 1980; 10: 3–12
- Bryson S CP. ß - Subunit of human chorionic gonadotropin, ultrasound, and ectopic pregnancy: A prospective study. Am J Obstet Gynecol 1983; 146: 163–5
- Kadar N, DeVore G, Romero R. Discriminatory hCG zone: its use in the sonographic evaluation for ectopic pregnancy. Obstet Gynecol 1981; 58: 156–61
- Nyberg D A, Filly R A, Mahony B S, Monroe S, Laing F C, Jeffrey R B. Early gestation: correlation of HCG levels and sonographic identification. AJR 1985; 144: 951–4
- Dinsmoor M, Gibson M. Early recognition of ectopic pregnancy in an infertility population. Obstet Gynecol 1986; 68: 859–62
- Carp H JA, Oelsner G, Serr D M, Mashiach S. Fertility after nonsurgical treatment of ectopic pregnancy. J Reprod Med 1986; 31: 119–22
- Ory S J, Villanueva A L, Sand P K, Tamura R K. Conservative treatment of ectopic pregnancy with methotrexate. Am J Obstet Gynecol 1986; 154: 1299–1306
- Lindblom B, Kälfellt B, Hahlin M, Hamberger L. Local prostaglandin F2α injection for termination of ectopic pregnancy. Lancet 1987; i: 776–7