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Cavoretto PI, Farina A, Girardelli S, Gaeta G, Spinillo S, Morano D, Amodeo S, Galdini A, Viganò P, Candiani M. Greater fetal crown-rump length growth with the use of in vitro fertilization or intracytoplasmic sperm injection conceptions after thawed versus fresh blastocyst transfers: secondary analysis of a prospective cohort study. Fertil Steril 2021; 116:147-156. [PMID: 33500139 DOI: 10.1016/j.fertnstert.2020.11.035] [Citation(s) in RCA: 15] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/18/2020] [Revised: 11/14/2020] [Accepted: 11/23/2020] [Indexed: 02/05/2023]
Abstract
OBJECTIVE To compare first-trimester fetal crown-rump length (CRL) measurements in pregnancies obtained after thawed blastocyst transfer versus fresh blastocyst transfer after in vitro fertilization (IVF)/intracytoplasmic sperm injection (ICSI). DESIGN Prospective longitudinal cohort study of CRL Z scores with adjustment for major confounders. SETTING University-affiliated obstetrics, fetal medicine, and fertility units. PATIENT(S) Singleton gestations conceived via IVF/ICSI and fresh or thawed blastocyst transfer with ultrasound performed at 6-14 weeks of gestational age. INTEVENTION None. MAIN OUTCOME MEASURE(S) CRL Z scores. RESULT(S) A total of 365 IVF/ICSI pregnancies were recruited (fresh: 161; thawed: 204). The mean CRL Z score at 6-14 weeks was significantly greater in thawed versus fresh transfers. Different growth trajectories between thawed and fresh transfers were detected: Mean CRL Z score was 0 at 65 days in fresh versus 80 days in frozen. Comparisons of both fresh and thawed transfers with reference values from the general population confirmed significantly lower CRL Z scores in both IVF/ICSI groups (P<.001). The risks of CRL <5th percentile in fresh versus thawed were, respectively 68% vs. 40% at 6 weeks and 2% vs. 1% at 14 weeks. A significant positive correlation between CRL Z scores and birth weight Z scores was found only for fresh transfers, not for thawed. CONCLUSION(S) At 6-14 weeks, thawed blastocyst transfers after IVF/ICSI conceptions present greater CRLs compared with fresh, and both IVF/ICSI groups show smaller CRLs than the general population. This effect is particularly evident before 9 weeks and it may favor birth weight difference of thawed versus fresh BT pregnancies.
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Affiliation(s)
- Paolo Ivo Cavoretto
- Department of Obstetrics and Gynecology, Scientific Institute for Research, Hospitalization and Healthcare, San Raffaele Hospital, University Vita e Salute, Milan, Italy.
| | - Antonio Farina
- Division of Obstetrics and Prenatal Medicine, Department of Medicine and Surgery, Sant'Orsola-Malpighi Hospital, University of Bologna, Bologna, Italy
| | - Serena Girardelli
- Department of Obstetrics and Gynecology, Scientific Institute for Research, Hospitalization and Healthcare, San Raffaele Hospital, University Vita e Salute, Milan, Italy
| | - Gerarda Gaeta
- Department of Obstetrics and Gynecology, Scientific Institute for Research, Hospitalization and Healthcare, San Raffaele Hospital, University Vita e Salute, Milan, Italy
| | - Silvia Spinillo
- Department of Obstetrics and Gynecology, Scientific Institute for Research, Hospitalization and Healthcare, San Raffaele Hospital, University Vita e Salute, Milan, Italy
| | - Danila Morano
- Department of Obstetrics and Gynecology, Sant'Anna University Hospital, Cona, Ferrara, Italy
| | - Silvia Amodeo
- Division of Obstetrics and Prenatal Medicine, Department of Medicine and Surgery, Sant'Orsola-Malpighi Hospital, University of Bologna, Bologna, Italy
| | - Alessandro Galdini
- Department of Obstetrics and Gynecology, Scientific Institute for Research, Hospitalization and Healthcare, San Raffaele Hospital, University Vita e Salute, Milan, Italy
| | - Paola Viganò
- Department of Obstetrics and Gynecology, Scientific Institute for Research, Hospitalization and Healthcare, San Raffaele Hospital, University Vita e Salute, Milan, Italy
| | - Massimo Candiani
- Department of Obstetrics and Gynecology, Scientific Institute for Research, Hospitalization and Healthcare, San Raffaele Hospital, University Vita e Salute, Milan, Italy
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