Study of 24 weeks antenatal visit as predictor of perinatal outcome

Singam S.K.¹, Desai S.²

¹Dr. Sirisha kumari Singam, ²Dr. Sangeeta Desai, Associate Professor, both authors are affiliated with Department of Obstetrics & Gynaecology Dr. D.Y Patil Medical College, Kolhapur Maharashtra, India.

Corresponding Author: Dr. Sangeeta Desai, Associate Professor, Department of Obstetrics & Gynaecology, Dr. D.Y Patil Medical College, Kolhapur Maharashtra, India. E-mail: klpskdesai@gmail.com

Abstract

Introduction:Once the pregnancy progresses to 24weeks, almost all the congenital anomalies and teratogenicity are ruled out. The progress there after is influenced by the maternal and obstetric factors. There is a need to establish the significance of all these variables with perinatal outcome and for thorough analysis. This study was focused on all low risk patients at 24 weeks of gestations to determine maternal factors affecting the perinatal outcome.Methods: The present study was a prospective observational study of 50 cases conducted in the Outpatient department of Obstetrics &Gynecology of Padmashri Dr. D. Y Patil, Hospital and research institute, Kadamwadi, Kolhapur. The patients were advised all the regular investigations and thedata collected was analyzed to determine maternal or fetal factors affecting the perinatal outcome. Results: 82% had normal Blood pressure and 18% patients had signs of pre-eclampsia. Factors leading to high risk pregnancy were 8% with oligohydramnios with preeclampsia with IUGR, 6% preeclampsia with IUGR, 4% each anemia; Doppler changes with preeclampsia with IUGR, oligohydramniosrespectively. Conclusion:In this study, late onset preeclampsia and anemia are the factors that are not detected at 24 weeks. It is also observed preeclampsia and anemia leads to IUGR. All the complications occurred after 36 weeks of gestational age, that means patient needs definite and regular follow up after 36 weeks.

Keywords: Preeclampsia, Oligohydramnios, IUGR, Pregnancy outcome.

Manuscript received: 27th December 2018 Reviewed: 4th January 2019 

Author Corrected: 10th January 2019 Accepted for Publication: 14th January 2019

Introduction

There is an increasing drive over the last 20years to push for the detection of women at risk of adverse pregnancy outcomes at 24weeks. Once the pregnancy progresses to 24 weeks, almost all the congenital anomalies, and teratogenicities are ruled out. The progress thereafter is influenced by the maternal and obstetric factors.

There is a need to establish the significance of all these variables with perinatal outcome and Opportunity for thorough analysis and empower the lady with mode of delivery, epidural, diet, breast feeding and preparation of breasts, to know her family support structure allowing her to make informed choices regarding pregnancy and delivery [1].

A stillbirth is a baby who is born dead after 24 completed weeks of pregnancy [2]. Generally, there are various factors influencing perinatal outcome. In high income countries, causes like placental pathologies, infection, umbilical cord abnormalities, medical and pregnancy-specific disorders are responsible for still birth [3]. In low/middle- income countries, infections, hypertensive disorders, FGR placental insufficiency, and APH are the causes for major ante partum stillbirths [4].

Placental (uterine and umbilical artery) Doppler ultrasound study at 23-24 gestational weeks is used to measure adverse perinatal outcomes including preeclampsia, SGA newborns (smaller than 3^rd percentile), preterm delivery (<34weeks or <37weeks of gestation at the time of delivery), admission to the neonatal intensive care unit and intra-uterine fetal death [4].

Preeclampsia is a major contributing cause of maternal and perinatal mortality and morbidity worldwide, especially in developing countries. Placental (uterine and umbilical artery) Doppler ultrasound examination at 23-24 gestational weeks is the best predictor of preeclampsia [6].

Delivery remains the only definite treatment. There is also a broad and mutual agreement to terminate the pregnancy when maternal or fetal conditions are affected or once 34 weeks of gestational age is reached. Termination at an earlier gestational age, however, is associated with an increased risk of adverse neonatal outcome [7].

Growth should be monitored from 24 weeks by measurement of the symphysiofundal height and plotting the growth by measures on a growth chart. Abnormal findings should be acted upon [8].

The leading causes of perinatal loss are preterm birth, fetal abnormalities and impaired placentation resulting to pre-eclampsia and fetal growth restriction (FGR)[9].

Material and Methods

Setting: at Padmashri Dr. D.Y Patil Hospital and Research Institute, Kolhapur in the Outpatient department of Obstetrics & Gynecology. Type of study: prospective observational study Registration of 50 patients wasdone over a 2 years period. These women were advised all the regular investigations including uterine Doppler, glucose challenge test and specialized investigations if needed like fetal echo, and monitored for various factors which can act as predictors of perinatal outcome.

Objectives: The main objective of this study was to establish 24 week biometry as a useful adjunct in the prediction of perinatal outcome and to assess fetal factors by ultrasonography for prediction of perinatal outcome in singleton, structurally and chromosomally normal fetuses and to assess the maternal factors by routine and special investigations.At the time of registration, the baseline information was taken especially with respect to sociodemographic factors, clinical findings, and other investigations.

 Inclusion Criteria: Primigravida, BMI 20-25kg/m2 (at viability scan), Height 150-170cms, Singleton pregnancy. Exclusion criteria: Hypertension, Endocrinal problems, multiple gestations and any medical illness complicating pregnancy. Sampling method: Patients coming to OBGY department at 24 weeks and having inclusion criteria were included in the study. Written informed consent was taken from the participants. Pre designed questionnaire schedule consisting of standard questions related to socio demographic factors, environmental conditions, addiction among family members, family size and so on, were interviewed. In addition, questionnaire also included questions on past and present medical history, detailed obstetric examination and health seeking behavior. Statistical method: The collected data was compiled in Microsoft Excel 2010 and analyzed using SPSS (Statistical Programme for Social Sciences) software 15 version, Open Epi Software Version 2.3. The study findings have been discussed taking into consideration the materials, study design, and results from other relevant studies. Conclusions were drawn based on the study, and recommendations were made using the results of the present study.

Results

In this study of 50 cases, mean age was 23.86 + 3.00 years, majority 52% were in age group of 21 to 25 years, followed by 36% were more than 26 years and only 12% were less than 20 years.

82% hadnormal Blood pressure and 18% patients had signs of pre-eclampsia.

Late onset pre-eclampsia (n=9) 55.55% at 38-39weeks, 44.44%at 37-38weeks.

Majority 78% had vaginal delivery and only 22% had LSCS

Mean birth weight was 2.78+ 0.37, majority 60% were in range of 2.6 to 3, 22% in 3.1 to 3.5 and 18% in 2 to 2.5. 18% were IUGR

Table-1: Age distribution among the study population

Table shows age distribution among the study population, where it was seen that majority 52% were in age group of 21 to 25 years, followed by 36% were more than 26 years and only 12% were less than 20 years

Table-2: Maternal outcome

Table shows Maternal outcome, where 18% had preeclampsia, 4% had anemia.

Table-3: Late onset pre-eclampsia (n=9)

Table shows Late onsetpre-eclampsia (n=9) 55.55%at 38-39weeks, 44.44%at 37-38weeks.

Table 4: High risk factors developed afterwards

Table shows High risk pregnancy shows with highest group (8%) had oligohydramnios with preeclampsia with IUGR, and the next group having preeclampsia with IUGR (6%) and the next group 4% each anemia, Doppler changes with preeclampsia with IUGR, Oligohydramnios

Table 5: Mode of delivery

Table shows mode of delivery, where majority 78% had vaginal delivery and only 22% had LSCS.

Table-6: Birth weight

Tableshows birth weight, where it was seen that majority 60% were in range of 2.6 to 3, 22% in 3.1 to 3.5 and 18% in 2 to 2.5.

Table-7: Fetal Outcome

Table shows Fetal Outcome, were it was seen that 18% newborn had IUGR.

Discussion

This study had a mean age was 23.86 + 3.00 years, which is lower than those reported in studies by Young JB et al [1] who observed that mean maternal age was 29.7 or Kate b [11] who observed mean maternal age 31.9 ± 5.4years. Study by R Thabane P et al [12] found that the mean age for women was 29.5 ± 6.6 years. Study by Praveen MA[13] found that the distribution according to age was as follows: 21–25 (46.23%), remaining 16.12%,23.65%, 10.75%, 3.23% are in the age groups of 15- 20 yrs, 26 – 30 yrs, 31 – 35 yrs, >36 yrs, respectively.

Majority patients in this study (78%) had vaginal delivery which is higher than several other studies i.e by Young j p et al [10] (30.3%) had vaginal delivery and Kate B [13](25%), Sultana et al [15] (46%), Eshetu s et al [16] (49%), Thabane P et al (15%), Parveen MA [13] (48.3%) found caesarian delivery in more number of patients.

Admission scan with Doppler showed that high risk factors from neonatal aspect were seen among 20% of patients. i.e. 8% oligohydramnios with IUGR, 4% oligohydramnios, 4% IUGR and 4% Doppler changes with IUGR.

High risk pregnancy, Study by Parveen m a [13] found that factors associated with pre-eclampsia in the study were anemia (55.91%), diabetes (3.22%), twins (4.3%) and previous history of pre-eclampsia (7.52%).

In present study 18% had pre eclampsia which is lower than those reported in studies byKate B [11]who found that 24% had hypertension in a patient of previous preeclampsia patients.

Study by Vesna et al[14]. Observed that patients from the early-onset group had significantly higher mean blood pressure (173.78/110.65 mmHg vs. 163.72 /104.25 mmHg, p<0.001). 1.17). In present study we have included patients of normal blood pressure in whom (18 %) patients developed late onset preeclampsia. Late onset preeclampsia is not an innocuous condition. [14] and has minimal effect over the baby.

Late onset preeclampsia (n=9), was 55.55% in 38-39weeks of gestation and 44.44% in37-38 weeks of gestation. In study by Kenneth et al[14], 30.7% were seen in 34 to 43 weeks.

Many studies have shown that early onset preeclampsia is associated with low birth weight babies.Study by Kate b [11].Observed that 31% had preterm birth. Study Eshetu s et al [13].31% had preterm birth. In a study by Dr Thabane p et al [10]. 5% had IUGR. Young j p et alfound that mean birth weight was 1.83 kg, Kate b [11].observed that mean birth weight was 2.5 kg, Eshetu s et al [16] found 72.2% >2.5 kg and 27.8% <2.5 kg.The median birth weight observed by Thabane P et al [12]was 1380 grams. Study by Vesna et al [17].Birth weight of newborns from the early-onset group were significantly lower (1485.75±502.15 vs. 3229.43±592.95, p<0.001). Intrauterine growth retardation and low birth weight are responsible for lot of neonatal complications and have late sequelae in their future life. They are common with early onset preeclampsia and needs early intervention. Study by Vesna et al [17]showed Intrauterine growth restriction (IUGR) was evident in 30 newborns from the early-onset group (20.4%) vs. 8 (11.3%) from late-onset group (p=0.027).

 We can predict and categories patient as low risk group and high risk for the sake of neonatal complications due to IUGR and preterm babies. In the present study average neonatal weight was 2780+ 0.37 gms which was in quite healthier rang.In present study it was seen that only 18% newborn had IUGR.Study by Young JB et al [10]observed that 27.5% had poor perinatal outcome and 72.5% had favorable outcome in patients of Doppler changes in umbilical arteryat mid trimester Single visit at 24 weeks can predictaboutperinatal outcome more effectively as we are ruling out all abnormalities in baby, Doppler study rules out reduced uteroplacental blood flow, glucose challenge test rules out gestational diabetes mellitus, fetal echo if necessary can detect cardiac abnormalities and early onset signs of preeclampsia can be ruled out. We found late onset preeclampsia which has minimal impact over perinatal outcome. There was no perinatal morbidity or mortality were found in our study. Neonatal complications are associated more due to prematurity, low birth weight and IUGR babies. From the study by Parveen m a [13].it was found that the most common neonatal complication was pre-maturity (23.65%), low birth weight (7.52%) and intra uterine growth restriction (9.67%).

Conventional antenatal care, which involves visits every 4 weeks up to 28 wks and every fortnightly till 36 weeks and then weekly until delivery, was established 80 years ago [18]. The high concentration of visits in the third trimester implies, as most of the complications occur at this late stage of pregnancy and, secondly, that most adverse outcomes are unpredictable during the first or even second trimesterIn this study, late onset preeclampsia and anemia are the factors that are not detected at 24 weeks. It is also observed preeclampsia and anemia leads to IUGR. All the complications occurred after 36 weeks of gestational age, which determine the significance of the needs of definite and regular follow up after 36 weeks. The review by Nicolas [18] presents evidence that many pregnancy complications can now be predicted at an integrated first hospital visit at 11–13 weeks by combining data from maternal characteristics and history with findings of biophysical and biochemical tests.

Conclusion

It is therefore proposed that the traditional pyramid of care should be inverted with the main emphasis placed in the first rather than third trimester of pregnancy. Further studies may have to be doneon large scale as differences may be attributed to the small number of patients recruited, racial differences, socioeconomic status and some certain demographic parameters such as parity, age and early age of marriage.

References

How to cite this article? 

Singam S.K, Desai S. Study of 24 weeks antenatal visit as predictor of perinatal outcome. Obg Rev:J obstet Gynecol 2019;5(1):1-6.doi: 10.17511/jobg.2019.i1.01.