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Annals of Clinical and Experimental Hypertension

Preeclampsia and Its Impact on Long-Term Cardiovascular Risk

Review Article | Open Access Volume 6 | Issue 1 |

  • 1. Department of Obstetrics and Gynaecology, University of Basel, Switzerland
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Corresponding Authors
Veit J, Department of Obstetrics and Gynaecology, University of Basel, Switzerland, Tel: 41 61 328 7968;
Abstract

Preeclampsia, a severe pregnancy associated disorder, is often complicated by impaired fetal growth or preterm delivery and can be associated with long-term maternal mortality and morbidity. Women with a history of preeclampsia have an increased risk of cardiovascular disease later in life. This may because by both postpartum endothelial dysfunction and asymptomatic structural cardiac alterations. Therefore, lifelong monitoring of cardiovascular risk factors following preeclampsia is advisable.

Keywords

•    Preeclampsia
•    Cardiovascular disease
•    Maternal mortality

Citation

Veit J, Lapaire O (2018) Preeclampsia and Its Impact on Long-Term Cardiovascular Risk. Ann Clin Exp Hypertension 6(1): 1053.

ABBREVIATIONS

BMI: Body Mass Index

INTRODUCTION

The underlying pathological cause of cardiovascular diseases is atherosclerosis. Hypertension, smoking, obesity, increased consumption of alcohol, stress, diabetes, physical inactivity and excessive salt consumption are major risk factors.

Patients who experienced preeclampsia often show signs of cardiac dysfunction and have an elevated risk for both development of hypertension and cardiovascular diseases later in life [1,2].

Adequate knowledge regarding cardiovascular abnormalities is important for long-term care during and after pregnancies complicated by preeclampsia and is of crucial importance for both cardiologists and obstetricians.

Preeclampsia as a risk factor

Preeclampsia doubles the risk of ischaemic cardiopathy, stroke and thromboembolism in the 5-15 years following pregnancy. Eighty percent of patients with prior preeclampsia develop arterial hypertension up to 20 years after pregnancy. Furthermore, preeclampsia is often associated with asymptomatic, functional cardiac disorders. Persistent left ventricular hypertrophy one year postpartum increases the risk by 40% for developing arterial hypertension two years after birth [3,4].

Metabolic syndrome as a risk factor

Figure 1 Invasion of the maternal circulation by trophoblasts. Modified according to Greer et al. [5].

Figure 1 Invasion of the maternal circulation by trophoblasts. Modified according to Greer et al. [5].

Women having the features of metabolic syndrome, such as arterial hypertension, increased insulin resistance, obesity or hyperlipidemia, often develop preeclampsia during pregnancy. The chronic dysregulation of the maternal metabolism may be responsible for an abnormal utero-placental environment in which the formation of the spiral arteries is restricted (Figure 1). This dysregulation has adverse effects on fetal and maternal health and may damage the major arteries of the heart, central nervous system and the circulation in the limbs over a longer period of time. The predisposing factors for preeclampsia are interestingly also risk factors for other endothelial diseases, particularly atherosclerosis. Common features of the two diseases are vasomotoric dysfunction, arterial hypertension, activation of platelet aggregation, endothelial damage and increased inflammatory tendency. The vascular lesions in preeclampsia accumulate in the placental blood vessels within a short time, while the atherosclerotic lesions develop over decades. However, the properties of the vascular changes of these two entities are similar.

In studies reported by Ray et al., and Cnattingius et al., a linear association between maternal body-mass-index(BMI), hypertriglyceridemia and the risk of preeclampsia or intrauterine fetal death could be demonstrated [6,7].

The risk of intrauterine fetal death increases with increasing BMI during pregnancy (Table 1). In a population-based cohort study of 167,750 women in Sweden (1992-1993), obese women tended to smoke more often than normal-weight women (28% vs. 24%) and to suffer from pre-existing diabetes mellitus or gestational diabetes (1.1% vs. 0.3%). The risk of developing preeclampsia increases with the maternal BMI (prevalence: 1.8% for underweight women, 2.5% for normal-weight women, 4.2% for overweight women, 7% for obese women) [7].

Table 1: Association between BMI and late death or early neonatal death

BMI No. of births Late fetal death Early neonatal death
  No. of cases N=466 Odds Ratio (95%CI) No. of cases N=309 Odds Ratio (95%CI)
<19.9 22,634 46 1 36 1
20.2-24.9 101,266 257 1.2 (0.9-1.7) 184 1.1 (0.8-1.6)
25.0-29.9 22,428 109 1.6 (1.1-2.3) 69 1.3 (0.9-1.9)
>30 10,412 54 2.6 (1.7-3.8) 20 1.2 (0.7-2.1)
Maternal BMI before pregnancy and the risk of adverse pregnancy outcome. Modified according to Cnattingius S et al. [7]

Maternal overweight and obesity are also associated with hyperlipidemia, which reduces prostaglandin secretion and promotes peroxidase production. This may lead to vasoconstriction and thrombocyte aggregation, which could be an important reason for the increased risk of developing preeclampsia in these women.

An association between hypertriglyceridemia and the development of preeclampsia could also be shown (Table 2).

Table 2: Prevalence of preeclampsia according to maternal triglyceride concentration.

Study design Citation Plasma or serum triglyceride concentration (mmol) Number of woman with pre-eclampsia within each triglyceride concentration category
1 2 3 4 1 2 3 4
cohort 17 <1.5 1.5-2.4 >2.4   37/1148 23/834 11/175  
22 <1.0 1.0-1.5 >1.5   9/175 19/189 29/203  
Case control 18 <1.0 1.0-1.3 1.3-1.5 >1.5 19/169 29/74 35/81 90/135
26 <2.1 2.6-3.2 2.6-3.2 >3.2 14/59 20/65 29/74 62/106
Modified according to Ray JG et al.[6]

Other studies, which examined the relationship between preeclampsia/pregnancy-induced hypertension and dyslipidemia/hyperlipidemia/hypertriglyceridemia have shown that a significantly increased triglyceride level could be observed in women with preeclampsia compared to women without this complication. The risk of preeclampsia increased with increasing triglyderide levels (Table 2).

Hypertriglyceridemia is associated with chronic inflammatory response, hypercoagulability and endothelial dysfunction. Since hypertriglyceridemia, together with obesity, hypertension and diabetes mellitus, is a component of the metabolic syndrome, which is associated with the development of preeclampsia and can persist up to six months postpartum, these characteristics can influence future pregnancies and the long-term risk of cardiovascular disease in women.

Does preeclampsia unmask pre-existing endothelial dysfunction or vascular disease?

The question arises whether women who are predestined for preeclampsia have a pre-existing metabolic dysbalance or whether the metabolic abnormalities and vascular damages are caused by preeclampsia itself.

It is very likely that the etiology is a combination of both situations. The presence of pre-existing risk factors for preeclampsia may contribute to the development of postpartum cardiovascular disease, but a link between preeclampsia and cardiovascular diseases can also be explained by a pre-existing metabolic dysfuntion [8].

Figure (2) shows that during pregnancy the risk of vascular disease increases due to metabolic and vascular changes. After childbirth the risk decreases again, but does not return to prepregnancy levels, so that the risk increases incre-mentally with every pregnancy. Sattar et al., have shown that the concentrations of lipids and coagulation factors in patients with preeclampsia are higher in the postpartum period and specific defects of vascular function can be found in these women compared to those with uneventful pregnancies, regardless of prior blood pressure levels or insulin resis-tance [9].

Figure 2 Schematic representation of vascular risks during a lifetime. Modified according to Rodie VA et al. [8].

Figure 2 Schematic representation of vascular risks during a lifetime. Modified according to Rodie VA et al. [8].

Several studies have showna link between coronary disease and multiple pregnancies [10]. However, it is assumed that this is due, among other things, to maternal weight gain and a greater risk of developing type 2 diabetes with increasing age.

Preterm (<37 weeks of gestation) preeclampsia increases cardiovascular risk

A prospective Norwegian study using data from the country`s national birth registry was conducted which included both multiparous as well as nulliparous / primigravid women from 1967 – 2002 [11]. It could be demonstrated that of the 836.147 women included, 23.000 had died by 2009, of whom 3.891 women had died from cardiovascular disease.

Primigravidity complicated by preterm preeclampsia was associated with an increased risk of cardiovascular death, with a hazard ratio of 9.2 (6.5-13.7), while women who had previously given birth had clearly lower risk, with a hazard ratio of 2.4 (1.5- 3.9). Patients with preeclampsia at term were also at a lower risk, with a hazard ratio of 3.4 (2.6-4.6) [11].

Within this group, multiparous women with preeclampsia at term, in contrast to primiparous women had a lower hazard ratio of 1.5 (1.2-2.0).

It seems unlikely that further pregnancies can reverse the endothelial changes that occurred during the first pregnancy. The findings in this study could have been affected by confounding variables, such as premature maternal death, which would obviously prevent further pregnancies. However, increased maternal mortality in the first years after pregnancy was not found, therefore this could not have been a factor which could have affected the results. Another reason that might prevent women from having more children could be the presence of other diseases which might lead physicians to advise against future pregnancies. It is certainly possible that women with preeclampsia and pre-existing diabetes often decide against future pregnancies.

Cardiovascular health after pregnancy-induced diseases

Pregnancy-induced hypertension, miscarriage and placental insufficiency often have common pathophysiologic mechanisms. Women with these pregnancy related complications frequently have risk factors for cardiovascular diseases such as obesity, preexisting hypertension, diabetes or hyperlipidemia.

Ray et al., demonstrated in a retrospective Canadian cohort study, which included over one million women without cardiovascular disease before the first documented birth, that the risk of early onset cardiovascular disease is significantly increased when maternal placental syndrome (which includes preeclampsia, pregnancy-induced hypertension and placental insufficiency) and fetal growth retardation/intrauterine fetal death had occurred (Table 3) [12].

Table 3: Risk of maternal premature cardiovascular disease, according to type of maternal placental syndrome and concomitant presence of poor fetal growth or intrauterine fetal death.

Maternal disease during pregnancy Hazard Ratio(95%) for cardiovascular disease
Maternal placenta syndrome (n=75380) 2.0 (1.7-2.2)
Placenta abruption (n=11156) 1.7 (1.3-2.2)
Gestational hypertension (n=20942) 1.8 (1.4-2.2)
Pre-eclampsia (n=36982) 2.1 (1.8-2.4)
Maternal placenta syndrome and poor fetal growth (n=4390) 3.1 (2.2-4.5)
Maternal placenta syndrome and intra uterine fetal death (n=1171) 4.4 (2.4-7.9)
Modified according to Ray JG et al. [12]

Sattar et al., also state that a low birth weight due to intrauterine growth restriction entails an increased risk of vascular disease in later life [9].

A retrospective study by Smith et al. showed that women who gave birth to a child with a birth weight below 2500 g had a seven to 11 times higher risk of dying from cardiovascular disease compared to women whose children had a birth weight over 3500 g [13]. This observation suggests an association between maternal risk factors for coronary heart disease and fetal programming. Intrauterine growth retardation could be due to a maternal genotype and phenotype associated with increased cardiovascular risk, allowing these risk factors to be passed through generations. The genotype cannot be altered, but by improving the maternal metabolic profile, e.g. through increased physical activity, weight loss and avoidance of nicotine, an improvement of fetal growth and development and a reduction of vascular risks may be achieved.

CONCLUSION

In patients with preeclampsia, a follow-up concept regarding evaluation for cardiovascular diseases later in life should be established and pre-existing conditions should be excluded. Despite a generally low risk in young women for cardiovascular disease, it has been shown that they have an up to 7-fold increased risk when early-onset preeclampsia, prematurity and intrauterine growth retardation occur [13]. In the case of cardiac dysfunction, therapeutic interventions should already be initiated during the asymptomatic phase, as the long-term prognosis can be effectively improved.

ACKNOWLEDGMENTS

Dorothy Huang, Department of Obstetrics and Gynaecology, University of Basel

REFERENCES

1. Brown MC, Best KE, Pearce MS, Waugh J, Robson SC, Bell R. Cardiovacular disease risk in women with pre-eclampsia: systematic review and meta-analysis. Eur J Epidemiol. 2013; 28: 1-19.

2. Williams D. Long-Term Complications of Preeclampsia. Semin. Nephrol. 2011; 31: 111-122.

3. Melchiorre K, Sutherland GR, Liberati M, Thilaganathan B. Preeclampsia Is Associated With Persistent Postpartum Cardiovascular Impairment. Hypertension. 2011; 58: 709-715.

4. Kuznetsova T, Herbots L, Jin Y, Stolarz-Skrzypek K, Staessen JA. Systolic and diastolic left ventricular dysfunction: from risk factors to overt heart failure. Expert Rev Cardiovasc Ther. 2010; 8: 251-258.

5. Greer IA,‎ Cameron IT,‎ Kitchener HC, Prentice A. Mosby’s Color Atlas and Text of Obstetrics and Gynecology.London: Harcourt Health Sciences. 2000; 160.

6. Ray JG, Diamond P, Singh G, Bell CM. Brief overview of maternal triglycerides as a risk factor for pre-eclampsia. BJOG. 2006; 113: 379- 386.

7. Cnattingius S, Bergström R, Lipworth L, Kramer MS. Prepregnancy weight and the risk of adverse pregnancy outcomes. N Engl J Med. 1998; 338: 147-152.

8. Rodie VA, Freeman DJ, Sattar N, Greer IA. Pre-eclampsia and cardiovascular disease: metabolic syndrome of pregnancy? Atherosclerosis. 2004; 175: 189-202.

9. Sattar N, Greer IA. Pregnancy complications and maternal cardiovascular risk: opportunities for intervention and screening? BMJ. 2002; 325: 157-160.

10. Klingberg S, Brekke HK, Winkvist A, Engström G, Hedblad B, Drake I. Parity, weight change, and maternalrisk ofcardiovascular events. AJOG. 2017; 2016: 172-172.

11. Skjaerven R, Wilcox AJ, Klungsøyr K, Irgens LM, Vikse BE, Vatten LJ, et al. Cardiovascular mortality after pre-eclampsia in one child mothers: prospective, population based cohort study. BMJ. 2012.

12. Ray JG, Vermeulen MJ, Schull MJ, Redelmeier DA.Cardiovascular health after maternal placental syndromes (CHAMPS): population-based retrospective cohort stud. Lancet. 2005 ; 366: 1797-1803.

13. Smith GCS, Pell JP, Walsh D. Pregnancy complications and maternal risk of ischaemic heart disease: a retrospective cohort study of 129290 births. Lancet. 2001; 357: 2002-2006.

Cite this article: Veit J, Lapaire O (2018) Preeclampsia and Its Impact on Long-Term Cardiovascular Risk. Ann Clin Exp Hypertension 6(1): 1053

Received : 29 Aug 2017
Accepted : 31 Jan 2018
Published : 31 Jan 2018
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