What matters in preeclampsia are the associated adverse outcomes: the view from Canada

Identifying the risk factors for the prevention of hypertensive disorders in pregnancy in a tertiary care hospital: A cross-sectional study

INTRODUCTION

Hypertensive disorders in pregnancy accounts for maternal morbidity and mortality globally.

AIM AND OBJECTIVES

We conducted this study to know the demographic profile and risk factors pertaining to lifestyle and behavioral aspects for hypertension among the pregnant women.

METHODOLOGY

It was a hospital-based cross-sectional study. During the routine antenatal checkups, those antenatal cases found hypertensive, were included in the study after taking written consent. A semi-structured questionnaire was prepared and pretested before conducting the actual study. Statistical analysis was done by SPSS (version 17) software. Participants' sociodemographic characteristics were described using descriptive statistics. Results are presented using graphs, tables, mean, percentages, standard deviation, frequency, and significance.

RESULTS

We observed that most of the study subjects 110 (48.9%) were educated up to secondary level followed by primary level 47 (20.9%) while 25 (11.1%) of the subjects were illiterate. We also found that 113 (50.2%) of the study subjects consumed additional salt in their diet and 57 (25.3%) of the study subjects had a history of intake of visible fat. Among 225 study subjects, 174 (77.3%) did not consume tobacco in any form. Among the 225 study subjects, 142 (60.9%) did not have a family history of hypertension. It was observed that 121 (53.77%) subjects had normal BMI while 16 (7.11%) subjects were underweight while 51 (22.6%) subjects were pre-obese. A total of 32 (14.22%) subjects were obese class 1 followed by 5 (2.22%) subjects who were obese class 2. It was observed that among 225 study subjects, 155 (68.9%) subjects had mild hypertension while 70 (31.1%) subjects had severe hypertension.

DISCUSSION

The scarcity of data regarding hypertension in pregnancy in low and middle income countries despite this, a comparatively high prevalence of hypertension in pregnancy was observed due to behavioral risk factors, which is mostly preventable at the primary care level.

RECOMMENDATIONS

It is possible to prevent PIH by eliminating behavioral risk factors through education and counseling to the pregnant ladies, at the primary care level by family physicians or primary care physicians which will reduce maternal mortality to a great extent.

Pregnancy Induced Hypertension and Associated Factors among Women Attending Delivery Service at Mizan-Tepi University Teaching Hospital, Tepi General Hospital and Gebretsadik Shawo Hospital, Southwest, Ethiopia

Background

Disorders of pregnancy induced hypertensive are a major health problem in the obstetric population as they are one of the leading causes of maternal and perinatal morbidity and mortality. The World Health Organization estimates that at least one woman dies every seven minutes from complications of hypertensive disorders of pregnancy. The objective of this study is to assess pregnancy induced hypertension and its associated factors among women attending delivery service at Mizan-Tepi University Teaching Hospital, Gebretsadikshawo Hospital and Tepi General Hospital.

Methods

A health facility based cross-sectional study was carried out from October 01 to November 30/2016. The total sample size (422) was proportionally allocated to the three hospitals. Systematic sampling technique was used to select study participants. Variables with p-value of less than 0.25 in binary logistic regression were entered into the multivariable logistic regression to control cofounding. Odds ratio with 95% confidence interval was used. P-value less than 0.05 was considered as statistically significant.

Results

The prevalence of pregnancy induced hypertension was 33(7.9%); of which 5(15.2%) were gestational hypertension, 12 (36.4%) were mild preeclampsia, 15(45.5%) were severe preeclampsia and 1 (3%) eclampsia. Positive family history of pregnancy induced hypertension [AOR5.25 (1.39-19.86)], kidney diseases (AOR 3.32(1.04-10.58)), having asthma [AOR 37.95(1.41-1021)] and gestational age (AOR 0.096(0.04-.23)) were predictors of pregnancy induced hypertension.

Conclusion

The prevalence of pregnancy induced hypertension among women attending delivery service was 7.9%. Having family history of pregnancy induced hypertension, chronic kidney diseases and gestational age were predictors of pregnancy induced hypertension.

Assessment of serum β-hCG and lipid profile in early second trimester as predictors of hypertensive disorders of pregnancy

OBJECTIVE

To assess and compare the ability of serum β-human chorionic gonadotropin (β-hCG) and serum lipid profile in early second trimester as predictors of hypertensive disorders of pregnancy.

METHODS

The present hospital-based prospective study was conducted between November 24, 2012, and April 30, 2014, at a tertiary hospital in Mangalore, India. Women of any parity with a pregnancy of 14-20 weeks were included. Venous blood (3 mL) was collected, and serum β-hCG and lipid profile were estimated by enzyme-linked immunosorbent assay and an enzymatic colorimetric test with lipid clearing factor, respectively. A cutoff value of β-hCG for predicting hypertensive disorders was obtained by receiver operating curve analysis.

RESULTS

Serum β-hCG was significantly higher among women who subsequently developed hypertension (71 142 IU/L [n=27]) than among those who did not (20 541 IU/L [n=137]; P<0.001). The sensitivity and specificity of serum β-hCG to predict hypertension were 92.6% and 94.9% respectively. The positive and negative predictive values were 78.1% and 98.5%, respectively.

CONCLUSION

Serum β-hCG might be used as a predictor of hypertensive disorders that complicate pregnancy. Dyslipidemia was not found to be a useful marker.

Endothelial nitric oxide synthase gene G894T polymorphism and risk assessment for pregnancy-induced hypertension: evidence from 11 700 subjects

Recent studies have reported the association between endothelial nitric oxide synthase (eNOS) gene G894T polymorphism and pregnancy-induced hypertension (PIH). However, the results have been inconsistent. We conducted a comprehensive meta-analysis to explore this association. A total of 36 case-control studies involving 4028 PIH cases and 7672 controls were ultimately included. In the overall analysis, no association was identified between eNOS gene G894T polymorphism and PIH risk in any of the genetic models. In the subgroup analysis, the results showed that T-allele carriers had a higher risk of PIH than those with the G allele in Asians (G vs. T: odds ratio (OR)=0.76, 95% confidence interval (CI)=0.63-0.91, P=0.002; GT+TT vs. GG: OR=1.32, 95% CI=1.09-1.59, P=0.004; TT vs. GT+GG: OR=1.96, 95% CI=1.26-3.06, P=0.003; TT vs. GG: OR=1.99, 95% CI=1.27-3.11, P=0.003; GT vs. GG: OR=1.23, 95% CI=1.05-1.43, P=0.009). For Latin American and African populations, the association between G894T polymorphism and susceptibility to PIH was only observed in the dominant model. However, no association was observed in Europeans and Americans. Therefore, eNOS gene G894T polymorphism was related to PIH risk, especially for Asians.

First-trimester levels of pregnancy-associated plasma protein A2 (PAPP-A2) in the maternal circulation are elevated in pregnancies that subsequently develop preeclampsia

Recent studies have consistently found pregnancy-associated plasma protein A2 (PAPP-A2) to be upregulated in preeclamptic placentae at term. We tested whether first-trimester circulating PAPP-A2 levels differed between complicated and uncomplicated pregnancies. We measured maternal PAPP-A2 levels at 10 to 14 weeks of gestational age in 17 pregnancies resulting in small-for-gestational-age (SGA) infants, 6 which developed preeclampsia (PE), 1 which developed PE and resulted in an SGA infant, and 37 gestational age-matched controls. The concentration of the PAPP-A2 isoform corresponding to the full-length protein was significantly higher in pregnancies that developed PE (35 ng/mL) compared with those that did not (23 ng/mL; P < .044). In contrast, we found no difference in PAPP-A2 levels between pregnancies that did or did not result in an SGA infant. The upregulation of PAPP-A2 that has previously been observed in PE at term appears to begin early in pregnancy, well before the symptoms develop.

Preeclampsia is associated with increased maternal body weight in a northeastern Brazilian population

Background

Preeclampsia is a disease with great variability in incidence across the world. The mortality is higher in lower income countries, where it is the leading cause of maternal mortality. This study aimed to determine the frequency of and risk factors for preeclampsia in a low income population from an urban area of Brazil.

Methods

A prospective case control study of 242 women of which 30 developed preeclampsia, 4 had gestational hypertension, 2 had superimposed hypertension, 11 had spontaneous abortion, 13 were lost to follow up and 192 had normal pregnancy. This latter group was considered the normotensive controls. The rate of preeclampsia and the risk of cardiovascular disease, after onset of preeclampsia, were determined.

Results

Of the 218 women who completed the study, the frequency of hypertensive disorder of pregnancy was 16.5% (36 of 218) and of preeclampsia was 13.8% (30 of 218). Women with preeclampsia had a higher body mass index (BMI), mean of 25.3 ± 4.8 compared to 23.5 ± 3.7 for the normotensive controls, p = 0.02. The risk of preeclampsia increased with BMI [Odds ratio (OR) 1.12, 95% Confidence Interval (CI = 1.02;1.24, p-value = 0.023)]. Women with preeclampsia developed chronic hypertension more often than normotensive controls (p = 0.043) and their systolic and ambulatory blood pressure monitoring was elevated (p = 0.034). Women with preeclampsia had higher BMI even 5 years post-pregnancy (p = 0.008).

Conclusions

Women who are overweight or older have an increased risk of preeclampsia. Previous history of preeclampsia increases the risk of early onset of chronic hypertension. Therefore, effective preventive measures are needed, particularly women at lower social economic stratum who have less access to proper medical care and adequate nutrition.

Suboptimal vitamin D levels in pregnant women despite supplement use

OBJECTIVE

Obtaining adequate vitamin D during pregnancy is important for the health of mother and child. Low circulating 25-hydroxyvitamin D (25OHD) concentrations, a measure of vitamin D status, have been reported in pregnant women in several countries; yet, there are few studies of pregnant Canadian women. We measured 25OHD concentrations in a multi-ethnic group of pregnant women living in Vancouver (49 degrees N) and explored the determinants of 25OHD.

METHODS

336 pregnant women (16-47 y) between 20 and 35 weeks gestation provided a blood sample and completed questionnaires.

RESULTS

Mean 25OHD was 67 (95% CI 64-69) nmol/L. Only 1% of women had a 25OHD concentration indicative of severe deficiency (<25 nmol/L). However, 24% and 65% of women were vitamin D insufficient based on cut-offs of 50 and 75 nmol/L, respectively. In multivariate analysis, mean 25OHD concentrations were 12 nmol/L higher in the summer compared to in winter. Women of European (White) ethnicity had a 9-13 nmol/L higher mean 25OHD concentration than women from other ethnic groups. Almost 80% of women took vitamin D-containing supplements containing > or = 400 IU/d. However, 24% and 65% of these women had 25OHD <50 and <75 nmol/L, respectively.

CONCLUSION

Vitamin D insufficiency was not uncommon in this group of pregnant women. Season and ethnicity were determinants of 25OHD but the magnitude of their effect was not large. Most women took vitamin D-containing supplements but this did not provide much protection against insufficiency. Consideration should be given to increasing the amount of vitamin D in prenatal supplements.

Regulation of pregnancy-associated plasma protein A2 (PAPPA2) in a human placental trophoblast cell line (BeWo)

BACKGROUND

Pregnancy-associated plasma protein A2 (PAPPA2) is an insulin-like growth factor-binding protein (IGFBP) protease expressed at high levels in the placenta and upregulated in pregnancies complicated by preeclampsia and HELLP (Hemolytic anemia, Elevated Liver enzymes, and Low Platelet count) syndrome. However, it is unclear whether elevated PAPPA2 expression causes abnormal placental development, or whether upregulation compensates for placental pathology. In the present study, we investigate whether PAPPA2 expression is affected by hypoxia, oxidative stress, syncytialization factors or substances known to affect the expression of PAPPA2's paralogue, PAPPA.

METHODS

BeWo cells, a model of placental trophoblasts, were treated with one of the following: hypoxia (2% O2), oxidative stress (20 microM hydrogen peroxide), forskolin (10 microM and 100 microM), TGF-beta (10 and 50 ng/mL), TNF-alpha (100 ng/mL), IL-1beta (100 ng/mL) or PGE2 (1 microM). We used quantitative RT-PCR (qRT-PCR) to quantify the mRNA levels of PAPPA2, as well as those of PAPPA and ADAM12 since these proteases have similar substrates and are also highly expressed in the placenta. Where we observed significant effects on PAPPA2 mRNA levels, we tested for effects at the protein level using an in-cell Western assay.

RESULTS

Hypoxia, but not oxidative stress, caused a 47-fold increase in PAPPA2 mRNA expression, while TNF-alpha resulted in a 6-fold increase, and both of these effects were confirmed at the protein level. PGE2 resulted in a 14-fold upregulation of PAPPA2 mRNA but this was not reflected at the protein level. Forskolin, TGF-beta and IL-1beta had no significant effect on PAPPA2 mRNA expression. We observed no effects of any treatment on PAPPA or ADAM12 expression.

CONCLUSION

Our study demonstrates that factors previously known to be highly expressed in preeclamptic placentae (PGE2 and TNF-alpha), contribute to the upregulation of PAPPA2. Hypoxia, known to occur in preeclamptic placentae, also increased PAPPA2 expression. These results are consistent with the hypothesis that PAPPA2 is upregulated as a consequence of placental pathology, rather than elevated PAPPA2 levels being a cause of preeclampsia.

Altered levels of insulin-like growth factor binding protein proteases in preeclampsia and intrauterine growth restriction

Intrauterine growth restriction (IUGR) and preeclampsia (PE) are leading causes of perinatal and maternal morbidity and mortality. Many studies have found association between low levels of insulin-like growth factor binding protein (IGFBP) proteases in the first trimester maternal circulation and the risk of subsequent development of PE and/or IUGR. These results are generally interpreted to reflect decreased production of the proteases by the placenta, leading to reduced proteolysis of IGFBPs and lower free levels of insulin-like growth factor (IGF), resulting in diminished feto-placental development. However, the association between low circulating levels of placental proteins early in pregnancy and the subsequent development of IUGR and/or PE could be due to low exchange in the placenta and not due to reduced production. In contrast, late in pregnancy, the circulating levels of these proteins and their expression in the placenta are often elevated in PE, which may reflect upregulation to compensate for abnormal placental development, that is an adaptive mechanism to increase IGFBP proteolysis, increase local IGF levels and promote feto-placental growth. Further research into the biological mechanisms underlying these associations will aid the identification of high-risk pregnancies and the development of therapeutic targets for diseases for which there are presently no preventative measures.

Combining biochemical and ultrasonographic markers in predicting preeclampsia: a systematic review

BACKGROUND

Early identification of pregnant women at risk for preeclampsia is a priority to implement preventive measures. Some biochemical and ultrasonographic parameters have shown promising predictive performance, but so far there is no clinically validated screening procedure.

CONTENT

Using a series of keywords, we reviewed electronic databases (Medline, Embase, all records to May 2009) reporting the performance of biological and ultrasonographic markers to predict preeclampsia, both single markers and combinations of markers. We analyzed the data according to gestational age and risk levels of the studied populations. We evaluated the methodological quality of included publications using QUADAS (quality assessment of diagnostic accuracy studies). We identified 37 relevant studies that assessed 71 different combinations of biochemical and ultrasonographic markers. Most studies were performed during the second trimester on small-scale high-risk populations with few cases of preeclampsia. Combinations of markers generally led to an increase in sensitivity and/or specificity compared with single markers. In low-risk populations, combinations including placental protein 13 (PP13), pregnancy-associated plasma protein A (PAPP-A), a disintegrin and metalloprotease-12 (ADAM12), activin A, or inhibin A measured in first or early second trimester and uterine artery Doppler in second trimester appear promising (sensitivity 60%-80%, specificity >80%). In high-risk populations, the combination of PP13 and pulsatility index in first trimester showed 90% sensitivity and 90% specificity in a single study limited to severe preeclampsia.

SUMMARY

Combinations of biochemical and ultrasonographic markers improved the performance of early prediction of preeclampsia. From a perspective of integrative medicine, large population-based studies evaluating algorithms combining multiple markers are needed, if screening approaches are to be eventually implemented.