Cerebroplacental Ratio: Can It Be Taken as a Single Predictor of Adverse Perinatal Outcome in Singleton Uncomplicated Pregnancy at Term
Akrishti Gupta, Bharti Maheshwari
Keywords :
Cerebroplacental ratio, Color Doppler, Intrapartum fetal compromise
Citation Information :
Gupta A, Maheshwari B. Cerebroplacental Ratio: Can It Be Taken as a Single Predictor of Adverse Perinatal Outcome in Singleton Uncomplicated Pregnancy at Term. J South Asian Feder Obs Gynae 2024; 16 (2):116-120.
Introduction: The brain-sparing (BS) phenomenon is considered an adaptive mechanism of the fetus, which is activated to protect the fetal brain in adverse conditions. The current challenge is, therefore, to identify vulnerable fetuses at risk of hypoxic complications, particularly within an apparently low-risk cohort before the onset of labor. The cerebroplacental ratio (CPR) is emerging as an important predictor of adverse pregnancy outcomes, and this has implications for assessment of the well-being of SGA and AGA fetuses close to term.
Materials and methods: It was a hospital-based prospective observational study. After obtaining informed consent from the patient, she was subjected to detailed history-taking and examination and underwent antenatal USG with color Doppler for CPR calculation.
Observations and results: The mean age of females enrolled in the study was 25.95 ± 3.50 years. About 63.5% patients had normal vaginal delivery, 35.0% had cesarean delivery, and 1.5% had instrumental delivery for intrapartum fetal compromise. Patients were divided into groups on the basis of Doppler findings, i.e., CPR ≤1.08 (n = 50) and CPR >1.08 (n = 150), adverse outcomes were significantly higher in groups with CPR ≤1.08 than in groups with CPR >1.08. CPR ≤1.08 was found to be 56.25% sensitive and 95.83% specific in predicting the poor outcome.
Conclusion: With the high specificity and positive predictive value of CPR, it is likely that those having normal CPR will have very less chance of adverse perinatal outcomes and, therefore, their delivery can be conducted at a peripheral center, and those with low CPR should be timely referred to a higher center where there are facilities for extensive fetal monitoring during the intrapartum period with availability of the neonatal unit (NNU).
Flatley C, Gibbons K, Hurst C, et al. Cross-validated prediction model for severe adverse neonatal outcomes in a term, non-anomalous, singleton cohort. BMJ Paediatr Open 2019;3(1):e000424. DOI: 10.1136/bmjpo-2018-000424.
Low JA, Pickersgill H, Killen H, et al. The prediction and prevention of intrapartum fetal asphyxia in term pregnancies. Am J Obstet Gynecol 2001;184(4):724–730. DOI: 10.1067/mob.2001.111720.
Ropacka-Lesiak M, Korbelak T, Breborowicz G. Hypoxia index in the prediction of abnormal CTG at delivery in uncomplicated pregnancies. Neuro Endocrinol Lett 2013;34(1):75–80. PMID: 23524628.
DeVore GR. The importance of the cerebroplacental ratio in the evaluation of fetal well-being in SGA and AGA foetuses. Am J Obstet Gynecol 2015;213(1):5–15. DOI: 10.1016/j.ajog.2015.05.024.
McIntyre S, Taitz D, Keogh J, et al. A systematic review of risk factors for cerebral palsy in children born at term in developed countries. Dev Med Child Neurol 2013;55(6):499–508. DOI: 10.1111/dmcn.12017.
Khalil AM, Morales-Rosello J, Morlando M, et al. Is fetal cerebroplacental ratio an independent predictor of intrapartum fetal compromise and neonatal unit admission? Am J Obstet Gynecol 2015;213(1):54.e1–54.e10. DOI: 10.1016/j.ajog.2014.10.024.
Kassanos D, Siristatidis C, Vitoratos N, et al. The clinical significance of Doppler findings in fetal middle cerebral artery during labor. Eur J Obstet Gynecol Reprod Biol 2003;109(1):45–50. DOI: 10.1016/s0301-2115(02)00512-2.
Sterne G, Shields LE, Dubinsky TJ. Abnormal fetal cerebral and umbilical Doppler measurements in fetuses with intrauterine growth restriction predicts the severity of perinatal morbidity. J Clin Ultrasound 2001;29(3):146–151. DOI: 10.1002/1097-0096(200103/04)29:3<146::aid-jcu1014>3.0.co;2-i.
Giles WB, Trudinger BJ. Umbilical cord whole blood viscosity and the umbilical artery flow velocity time waveforms: A correlation. Br J Obstet Gynaecol 1986;93(5):466–470. PMID: 3707877.
Arias F. Accuracy of the middle-cerebral-toumbilical-artery resistance index ratio in the prediction of neonatal outcome in patients at high risk for fetal and neonatal complications. Am J Obstet Gynecol 1994;171(6):1541–1545. DOI: 10.1016/0002-9378(94)90398-0.
Ebrashy A, Azmy O, Ibrahim M, et al. Middle cerebral/umbilical artery resistance index ratio as sensitive parameter for fetal well-being and neonatal outcome in patients with preeclampsia: Case-control study. Croat Med J 2005;46(5):821–825. PMID: 16158478.
Parer JT, King TL. Electronic fetal monitoring as a public health screening program: The arithmetic of failure. Obstet Gynecol 2011;117(4):986. DOI: 10.1097/AOG.0b013e318212ecc8.