Abstract
Purpose
To clarify risk factors and clinical outcomes for placenta accreta spectrum (PAS) stratified by placenta previa.
Methods
We conducted registry-based multicenter cross-sectional study including 472,301 singleton deliveries between 2013 and 2015. PAS was considered as a primary outcome, as well as maternal age, parity, history of cesarean section, history of miscarriage, and assisted reproductive technology (ART) were considered as potential exposures. A multivariable Poisson regression analysis was conducted to assess the risk for PAS, stratified by placenta previa. In addition, the risk for subsequent blood transfusion and hysterectomy by each exposure using multivariable Poisson regression analysis was conducted.
Results
There were 426 and 1827 cases of PAS with and without placenta previa. Among cases with placenta previa, the number of previous cesarean sections was the most powerful predictor for PAS [adjusted risk ratio (aRR) for one previous cesarean section 5.34, 95% confidence interval (CI) 3.70–7.71; aRR for two or more previous cesarean section 16.5, 95% CI 11.5–23.6]. Among cases without placenta previa, previous cesarean section was not a significant predictor, whereas the strongest predictor was conception through ART (aRR 5.05, 95% CI 4.50–5.66). Although the risks of PAS for blood transfusion and hysterectomy were higher among cases with placenta previa, those without placenta previa also demonstrated non-negligible risks.
Conclusion
The current study demonstrated that history of cesarean section was the strongest risk factor for PAS among women with placenta previa. Among those without placenta previa, ART was an important predictor, but not cesarean section.
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Availability of data and materials
The data that support the findings of this study are available from the Japan Society of Obstetrics and Gynecology but restrictions apply to the availability of these data, which were used under license for the current study, and so are not publicly available. Data are, however, available from the authors upon reasonable request and with permission of the Japan Society of Obstetrics and Gynecology.
Code availability
STATA custom code cannot be shared publicly, but it is available on request from Kohei Ogawa (ogawa-k@ncchd.go.jp).
References
Mogos MF, Salemi JL, Ashley M, Whiteman VE, Salihu HM (2016) Recent trends in placenta accreta in the United States and its impact on maternal-fetal morbidity and healthcare-associated costs, 1998–2011. J Mater Fetal Neonatal Med 29:1077–1082. https://doi.org/10.3109/14767058.2015.1034103
Mhyre JM, Shilkrut A, Kuklina EV, Callaghan WM, Creanga AA, Kaminsky S, Bateman BT (2013) Massive blood transfusion during hospitalization for delivery in New York State, 1998–2007. Obstet Gynecol 122:1288–1294. https://doi.org/10.1097/AOG.0000000000000021
Sheiner E, Sarid L, Levy A, Seidman DS, Hallak M (2005) Obstetric risk factors and outcome of pregnancies complicated with early postpartum hemorrhage: a population-based study. J Mater Fetal Neonatal Med 18:149–154. https://doi.org/10.1080/14767050500170088
Goffman D, Nathan L, Chazotte C (2016) Obstetric hemorrhage: a global review. Semin Perinatol 40:96–98. https://doi.org/10.1053/j.semperi.2015.11.014
Fitzpatrick KE, Sellers S, Spark P, Kurinczuk JJ, Brocklehurst P, Knight M (2012) Incidence and risk factors for placenta accreta/increta/percreta in the UK: a national case-control study. PloS One 7:e52893. https://doi.org/10.1371/journal.pone.0052893
Hasegawa J, Nakamura M, Hamada S, Matsuoka R, Ichizuka K, Sekizawa A, Okai T (2001) Analysis of the predictable variables for placenta accreta without placenta previa. J Med Ultrason 39:249–254. https://doi.org/10.1007/s10396-012-0373-8
Silver RM, Landon MB, Rouse DJ et al (2006) Maternal morbidity associated with multiple repeat cesarean deliveries. Obstet Gynecol 107:1226–1232. https://doi.org/10.1097/01.AOG.0000219750.79480.84
Wu S, Kocherginsky M, Hibbard JU (2005) Abnormal placentation: twenty-year analysis. Am J Obstet Gynecol 192:1458–1461. https://doi.org/10.1016/j.ajog.2004.12.074
Eshkoli T, Weintraub AY, Sergienko R et al (2013) Placenta accreta: risk factors, perinatal outcomes, and consequences for subsequent births. Am J Ostet Gynecol 208(219):e1-7
Rosenberg T, Pariente G, Sergienko R et al (2011) Critical analysis of risk factors and outcome of placenta previa. Arch Gynecol Obstet 284:47–51
Hung TH, Shau WY, Hsieh CC, Chiu TH, Hsu JJ, Hsieh TT (1999) Risk factors for placenta accreta. Obstet Gynecol 93:545–550. https://doi.org/10.1016/s0029-7844(98)00460-8
Baldwin HJ, Patterson JA, Nippita TA, Torvaldsen S, Ibiebele I, Simpson JM, Ford JB (2018) Antecedents of abnormally invasive placenta in primiparous women: risk associated with gynecologic procedures. Obstetr Gynecol 131:227–233. https://doi.org/10.1097/aog.0000000000002434
Kaser DJ, Melamed A, Bormann CL, Myers DE, Missmer SA, Walsh BW, Racowsky C, Carusi DA (2015) Cryopreserved embryo transfer is an independent risk factor for placenta accreta. Fertil Steril 103:1176-1184.e2. https://doi.org/10.1016/j.fertnstert.2015.01.021
Ogawa K, Morisaki N, Saito S, Sato S, Fujiwara T, Sago H (2017) Association of shorter height with increased risk of ischaemic placental disease. Paediatr Perinat Epidemiol 31:198–205. https://doi.org/10.1111/ppe.12351
Breen JL, Neubecker R, Gregori CA, Franklin JE (1977) Placenta accreta, increta, and percreta. A survey of 40 cases. Obstet Gynecol 49:43–47
Naeye RL (1983) Maternal age, obstetric complications, and the outcome of pregnancy. Obstet Gynecol 61:210–216
Pandey S, Shetty A, Hamilton M et al (2012) Obstetric and perinatal outcomes in singleton pregnancies resulting from IVF/ICSI: a systematic review and meta-analysis. Hum Reprod Update 18:485–503
Esh-Broder E, Ariel I, Abas-Bashir N, Bdolah Y, Hochner CD (2011) Placenta accreta is associated with IVF pregnancies: a retrospective chart review. BJOG 118:1084–1089. https://doi.org/10.1111/j.1471-0528.2011.02976.x
Royster GDt, Krishnamoorthy K, Csokmay JM, Yauger BJ, Chason RJ, DeCherney AH, Wolff EF, Hill MJ (2016) Are intracytoplasmic sperm injection and high serum estradiol compounding risk factors for adverse obstetric outcomes in assisted reproductive technology? Fertil Steril 106:363-370.e3. https://doi.org/10.1016/j.fertnstert.2016.04.023
Saito K, Kuwahara A, Ishikawa T, Morisaki N, Miyado M, Miyado K, Fukami M, Miyasaka N, Ishihara O, Irahara M, Saito H (2019) Endometrial preparation methods for frozen-thawed embryo transfer are associated with altered risks of hypertensive disorders of pregnancy, placenta accreta, and gestational diabetes mellitus. Hum Reprod 34:1567–1575. https://doi.org/10.1093/humrep/dez079
Duzyj CM, Cooper A, Mhatre M, Han CS, Paidas MJ, Illuzzi JL, Sfakianaki AK (2019) Placenta accreta: a spectrum of predictable risk, diagnosis, and morbidity. Am J Perinatol 36:1031–1038. https://doi.org/10.1055/s-0038-1676111
Miller DA, Chollet JA, Goodwin TM (1997) Clinical risk factors for placenta previa-placenta accreta. Am J Obstet Gynecol 177:210–214. https://doi.org/10.1016/s0002-9378(97)70463-0
Kyozuka H, Yamaguchi A, Suzuki D, Fujimori K, Hosoya M, Yasumura S, Yokoyama T, Sato A, Hashimoto K (2019) Risk factors for placenta accreta spectrum: findings from the Japan environment and Children’s study. BMC Pregnancy Childbirth 19:447. https://doi.org/10.1186/s12884-019-2608-9
Ishihara O, Araki R, Kuwahara A, Itakura A, Saito H, Adamson GD (2014) Impact of frozen-thawed single-blastocyst transfer on maternal and neonatal outcome: an analysis of 277,042 single-embryo transfer cycles from 2008 to 2010 in Japan. Fertil Steril 101:128–133. https://doi.org/10.1016/j.fertnstert.2013.09.025
Acknowledgements
We thank the Japan Society of Obstetrics and Gynecology Perinatal Committee as well as all participating hospitals for the provision of the data used. In addition, we would like to thank the medical editor from the Division of Education for Clinical Research at the National Center for Child Health and Development for editing this manuscript.
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KO initiated the concept, designed the study, analyzed the data, and wrote the initial manuscript. SJ, NM, and SH gave critical comments on the study design, analysis, and interpretation, as well as revised the draft.
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The registry of the Japan Society of Obstetrics and Gynecology Perinatal Database was conducted in accordance with the guidelines of the Declaration of Helsinki and other nationally valid regulations. All participating hospitals posted that they were participating in this database and that all data would be included in the research unless noted by the physician as otherwise. The JSOG website posted a summary of all analytical studies, and each hospital notified the patients to contact their hospital if they did not want to be included. The protocol for this study was approved by the Institutional Review Board at the National Center for Child Health and Development on April 18, 2017 (No. 1448).
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Ogawa, K., Jwa, S.C., Morisaki, N. et al. Risk factors and clinical outcomes for placenta accreta spectrum with or without placenta previa. Arch Gynecol Obstet 305, 607–615 (2022). https://doi.org/10.1007/s00404-021-06189-2
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DOI: https://doi.org/10.1007/s00404-021-06189-2
Keywords
- Assisted reproductive technology
- History of cesarean section
- Placenta accreta spectrum
- Placenta previa