Prediction of adverse pregnancy outcomes using uterine artery Doppler imaging at 22-24 weeks of pregnancy: A North Indian experience

Utilization of Uterine and Umbilical Artery Doppler in the Second and Third Trimesters to Predict Adverse Pregnancy Outcomes: A Nigerian Experience

Objective: To assess the utility of uterine and umbilical artery Doppler in the second and third-trimester in predicting adverse pregnancy outcomes.

Methodology: In a prospective longitudinal study, the demographic, clinical, Doppler ultrasound parameters of the uterine and umbilical arteries of 84 consecutive women attending the antenatal clinic at 22–24 weeks and 116 women at 30–34 weeks gestation and pregnancy outcomes were documented and analyzed.

Results: Pregnant women with adverse pregnancy outcomes had significantly higher second-trimester mean uterine systolic/diastolic (S/D) ratio (p = 0.001), pulsatility index (PI; p = 0.003), umbilical artery S/D (p = 0.016), and resistivity index (RI; p = 0.041) as well as higher third-trimester uterine S/D and PI. While pregnancies with adverse fetal outcomes showed significantly higher uterine artery S/D and PI at the second trimester, third-trimester uterine showed higher S/D, RI, and PI and umbilical artery PI than in women with normal fetal outcomes. The combination of uterine PI and early diastolic notch were predictors of maternal outcomes and correctly predicted 73% (p < 0.001) in the second trimester. By the third trimester, the uterine PI alone was the best predictor and accurately predicted about 62% of maternal outcomes (p = 0.028). In addition, the second-trimester uterine S/D and early diastolic notch and uterine PI in the third trimester correctly predicted 79% and 78% of fetal outcomes, respectively.

Conclusion: Among unselected pregnant women population, the second-trimester Doppler parameters are better predictors of maternal adverse pregnancy outcomes, while adverse fetal outcome prediction by uterine and umbilical Doppler at the second- and the third-trimester parameters are comparable.

Predictors of adverse perinatal outcome up to 34 weeks, a multivariable analysis study

The objective was to evaluate the best predictors of adverse perinatal outcome (APO) in foetuses examined up to 34 weeks and delivered by spontaneous or induced labour. This was a retrospective study of 129 pregnancies that underwent an ultrasound Doppler examination at 23-34 weeks and entered into labour within 30 days. Cerebroplacental ratio (CPR) and mean uterine artery pulsatility index (mUtA PI) were converted into multiples of the median (MoM) and estimated foetal weight (EFW) into centiles to adjust for gestational age (GA). Sonographic and clinical parameters were evaluated using logistic regression analysis.The multivariable model for the prediction of APO presented a notable accuracy: Detection rate (DR) was 39.5% for a false positive rate (FPR) of 5% and 56.8% for a FPR of 10%, AUC 0.82, p < .0001. Significant predictors were GA, EFW centile, and CPR MoM, but not mUtA PI MoM. Moreover, the type of labour onset did not exert any influence on APO. In conclusion, up to 34 weeks, prediction of APO after spontaneous or induced labour may be done measuring CPR and EFW.IMPACT STATEMENTWhat is already known on this subject? Earlier in pregnancy, foetal growth restriction is caused by placental disease causing progressive hemodynamic changes. These changes have been exhaustively described. Conversely, information about the best predictors of adverse outcome is scarce.What do the results of this study add? The findings of this study show that prior to 34 weeks and up to 1 month before labour, labour outcome might be predicted by gestational age, foetal cerebroplacental ratio (CPR) and estimated foetal weight (EFW).What are the implications of these findings for clinical practice and/or further research? If CPR behaves as a good marker of outcome not only at the end of pregnancy but also earlier in gestation, it might be interrogated along with EFW in foetuses attempting vaginal delivery to determine the risk of adverse outcome.

Prognostic accuracy of antenatal Doppler ultrasound for adverse perinatal outcomes in low-income and middle-income countries: a systematic review

OBJECTIVES

This systematic review examined available literature on the prognostic accuracy of Doppler ultrasound for adverse perinatal outcomes in low/middle-income countries (LMIC).

DESIGN

We searched PubMed, Embase, Cochrane Library and Scopus from inception to April 2020.

SETTING

Observational or interventional studies from LMICs.

PARTICIPANTS

Singleton pregnancies of any risk profile.

INTERVENTIONS

Umbilical artery (UA), middle cerebral artery (MCA), cerebroplacental ratio (CPR), uterine artery (UtA), fetal descending aorta (FDA), ductus venosus, umbilical vein and inferior vena cava.

PRIMARY AND SECONDARY OUTCOME MEASURES

Perinatal death, stillbirth, neonatal death, expedited delivery for fetal distress, meconium-stained amniotic fluid, low birth weight, fetal growth restriction, admission to neonatal intensive care unit, neonatal acidosis, Apgar scores, preterm birth, fetal anaemia, respiratory distress syndrome, length of hospital stay, birth asphyxia and composite adverse perinatal outcomes (CAPO).

RESULTS

We identified 2825 records, and 30 (including 4977 women) from Africa (40.0%, n=12), Asia (56.7%, n=17) and South America (3.3%, n=01) were included. Many individual studies reported associations and promising predictive values of UA Doppler for various adverse perinatal outcomes mostly in high-risk pregnancies, and moderate to high predictive values of MCA, CPR and UtA Dopplers for CAPO. A few studies suggested that the MCA and FDA may be potent predictors of fetal anaemia. No randomised clinical trial (RCT) was found. Most studies were of suboptimal quality, poorly powered and characterised by wide variations in outcome classifications, the timing for the Doppler tests and study populations.

CONCLUSION

Local evidence to guide how antenatal Doppler ultrasound should be used in LMIC is lacking. Well-designed studies, preferably RCTs, are required. Standardisation of practice and classification of perinatal outcomes across countries, following the international standards, is imperative.

PROSPERO REGISTRATION NUMBER

CRD42019128546.

Doppler Uterine Artery Ultrasound in the Second Trimester of Pregnancy to Predict Adverse Pregnancy Outcomes

Purpose. To determine in uterine artery (UtA) the mean pulsatility index (PI), systolic/diastolic (S/D) ratio and the presence/absence of notch in the second trimester of pregnancy, with normal or abnormal pregnancy outcome. Material and Methods. We performed an analysis of 135 cases with high risk pregnancy in Obstetrics and Gynecology Department of The Municipal Hospital Filantropia, Craiova, between October 2016 and May 2020. The ultrasound evaluation in the second trimester was performed during the second trimester morphology scan, or after this, but up to 24 weeks of pregnancy. Results. The study showed only in the case of early preeclampsia (PE) a statistical significance for mean PI-UtA percentiles in the second trimester. In the other studied categories of pregnancy outcome, even we did not have a statistical significance, we found a specificity of 75% and positive predictive value of 88.89% in late PE. The presence of notch in the second trimester was statistically significant (p value <0.05) in the case of premature birth (PB) and early PE. A positive predictive value of 77.50% we found only in case of late PE. Conclusions. Our results show that routine Doppler screening of the uterine arteries during the second trimester did not make an accurate prediction of fetal growth restriction, preeclampsia or preterm birth. However, we believe that the present study results prove that this screening may select a population with increased risk of adverse outcome, which would give them the opportunity to benefit from an early intervention.

Evaluation of Uterine Artery Doppler (Mean Pulsatility Index) at 11-14 Weeks of Gestation as Predictor of Hypertensive Disorders of Pregnancy: A Prospective Observational Study

BACKGROUND

The etiology and pathophysiology of hypertensive disorders of pregnancy remains enigmatic, and till date, no test can accurately predict it. Early screening may allow vigilant antenatal surveillance, timely delivery and thus substantially reduce maternal and perinatal morbidity and mortality. Our study aims to evaluate the predictive value of uterine artery mean pulsatility index (PI) at 11-14 weeks and find a reference value for hypertensive disorders of pregnancy.

METHODS

A prospective study of 240 antenatal women using non-probability simple random sampling was carried out in a tertiary care center. Mean uterine artery PI was obtained at 11-14 weeks of gestation. Pregnancies were followed till delivery and 7 days postpartum. The major end point was development of hypertensive disorders of pregnancy. Maternal and neonatal outcomes were also assessed.

RESULTS

The predictability of uterine artery mean pulsatility index (PI) at 11-14 weeks for hypertensive disorders of pregnancy was significantly high with an odds ratio of 174.45 (95% CI 65.31-549.13; p < 0.0001), sensitivity (89.3%), specificity (95.8%), positive predictive value(90.5%) and negative predictive value (95.1%).

CONCLUSION

Uterine artery mean PI at 11-14 weeks of gestation is a cost-effective predictive test for hypertensive disorders of pregnancy, and the recommended reference value for Indian population of is 2.28.

Role of second-trimester uterine artery Doppler indices in the prediction of adverse pregnancy outcomes in a low-risk population

OBJECTIVE

To evaluate use of second-trimester uterine artery Doppler velocimetry to predict adverse pregnancy outcomes.

METHODS

A prospective longitudinal study among low-risk nulliparous women with singleton pregnancies attending Ekiti State University Teaching Hospital, Nigeria, between July and December 2017. Uterine artery Doppler indices were measured at 22-26 gestational weeks. Resistance index (RI) of 0.58 or less and pulsatility index (PI) of 1.6 or less were considered normal. The ability of Doppler indices to predict adverse pregnancy outcomes was determined.

RESULTS

Among 120 women, 73 (60.8%) women had at least one abnormal Doppler index and 50 (41.7%) at least one adverse pregnancy outcome. For pre-eclampsia, sensitivity and specificity of RI were 40.0% and 37.3% (area under curve [AUC], 0.28), and those of PI were 20.0% and 89.1% (AUC, 0.33) respectively. For intrauterine growth restriction, sensitivity and specificity of RI were 23.1% and 34.6% (AUC, 0.22), and those of PI were 0% and 86.95% (AUC, 0.48), respectively. For low birthweight, sensitivity and specificity of RI were 60.0% and 38.9% (AUC, 0.54), and those of PI were 20.0% and 90.5% (AUC, 0.55), respectively.

CONCLUSION

Late second-trimester uterine artery Doppler velocimetry had limited ability to predict adverse pregnancy outcomes in a low-risk population.

Effect of previous cesarean sections on second-trimester uterine artery Doppler

AIM

In this study, we investigated the effects of previous cesarean sections on uterine artery Doppler indices.

METHODS

This prospective cohort study included 153 healthy pregnant women between 18 and 24 weeks of gestation. Seventy-three pregnant women without previous cesarean sections (control group) and 80 pregnant women with previous cesarean sections (study group) were compared in terms of uterine artery Doppler indices.

RESULTS

The mean uterine artery pulsatility index (PI) MoM value was 1.18 ± 0.40 in the study group and 1.07 ± 0.35 in the control group (P = 0.046). The number of patients with uterine artery PI values above 95 percentile was 18 (22.5%) in the study group and 5(6.8%) in the control group (P = 0.007). The mean gestational age at birth was significantly lower in the study group (38.2 ± 1.3 vs. 39 ± 1.0, P < 0.001). There was no significant difference between the mean PI, resistance index (RI) and systolic/diastolic (S/D) ratio values of the uterine artery (P = 0.16, 0.11, 0.08, respectively). When the comparison was made with the number of previous cesarean sections, all three index values of the patients who had had more than two cesarean sections were found to be significantly higher.

CONCLUSION

The Doppler flow indices of the uterine artery significantly increased in patients with more than two previous cesarean sections. When evaluating uterine artery Doppler indices in pregnant women with a history of previous cesarean sections, these factors should be considered.