Control of hypertension in pregnancy

Maternal and Fetal Outcomes in Pregnancy in the Fifth Decade of Life and Beyond

OBJECTIVES

The objective is to evaluate maternal and fetal outcomes at an extremely advanced maternal age (AMA) (over age 50 years) in Calgary. The secondary objective is to determine if there is a role in protocolizing complex care plans for patients at extreme AMAs.

METHODS

A retrospective chart review was conducted of all pregnancies ≥20 weeks gestation in patients over the age of 50 years that delivered in Calgary between January 2007 and December 2021. Pregnancy data were collected, including maternal age, pre-existing medical conditions, mode and timing of delivery, neonatal outcomes, neonatal intensive care unit (NICU) and adult intensive care unit (ICU) admissions, postpartum complications, and maternal or neonatal death. Data were extracted for maternity patients as well as neonatal ICU databases. Maternal and neonatal outcomes were assessed until discharge from hospital.

RESULTS

All 23 pregnancies identified were achieved through assisted reproductive technologies. Comorbidities varied, but the most common comorbidities included hypertension and gestational diabetes. Cesarean delivery was the most common form of delivery. Three cases involved postpartum maternal ICU admission. Neonatal outcomes included gestational ages of 22-39 weeks and birth weights of 486-3593 g, with 8 confirmed NICU admissions. The most common neonatal complications were jaundice and small for gestational age.

CONCLUSIONS

Extremely AMA patients are more likely to have pre-existing comorbidities and develop comorbidities during pregnancy. The potential for adverse maternal and fetal outcomes is greater for these pregnancies; however, the complications are diverse and developing a universal complex care plan is difficult.

Treatment of acute-onset hypertension in pregnancy: A network meta-analysis of randomized controlled trials comparing anti-hypertensives and route of administration

BACKGROUND

Consensus on the relative efficacy of available antihypertensive agents used in pregnancy is lacking.

OBJECTIVE

To compare treatment success with antihypertensives and categorize by route of administration.

SEARCH STRATEGY

MEDLINE, Embase, PubMed, Web of Science, Scopus, CINAHL, and clinicaltrials.gov were searched without date restriction.

DATA COLLECTION

Peer-reviewed randomized controlled trials (RCTs) comparing pharmacologic agents used to treat hypertension in parturients were included. Evaluated treatment groups included IV-labetalol (BBIV), IV-hydralazine (DIV), oral-nifedipine (CCBPO), sublingual nifedipine (CCBSL), IV-calcium channel blocker (nonspecific)(CCBIV), IV-nitroglycerine (NTG), epoprostenol infusion (PRO), IV-ketanserin (5HT2B), IV-diazoxide (BZO), oral-nifedipine + methyldopa (CCBAG), oral-methyl-dopa (AAG), and oral prazosin (ABPO).

ANALYSIS

Seventy-four studies (8324 patients) were eligible post PRISMA guidelines screening. Results were pooled using a Bayesian-approach for success of treatment (study defined target blood pressure), time to achieve target pressure, and neonatal intensive-care admissions.

RESULTS

Treatment success (primary outcome, 55 trials with 5518 patients) was analyzed. Surface under the cumulative ranking curve (SUCRA) was categorized for 13 drugs, CCBPO (0.84) followed by CCBSL (0.78) were most likely to be effective in achieving target blood pressure. After sub-grouping by presence/absence of preeclampsia, CCB-PO ranked highest for both [(0.82) vs. (0.77), respectively]. Serotonin antagonists (0.99) and nitroglycerin (0.88) ranked highest for time to target pressure. NICU admissions were lowest for alpha-2 agonists (0.89), followed by BB PO (0.82) and hydralazine IV (0.49).

CONCLUSION

Oral calcium-channel blockers ranked highest for treatment success. Ketanserin achieved target blood pressure fastest, warranting additional research. The results should be interpreted with caution as SUCRA values may not indicate whether the differences between interventions have clinically meaningful effect sizes.

Perinatal Outcomes Associated With Management of Stage 1 Hypertension

OBJECTIVE

To evaluate the association between maternal blood pressure (BP) below 130/80 mm Hg compared with 130-139/80-89 mm Hg and pregnancy outcomes.

METHODS

We conducted a planned secondary analysis of CHAP (Chronic Hypertension and Pregnancy), an open label, multicenter, randomized controlled trial. Participants with mean BP below 140/90 mm Hg were grouped as below 130/80 mm Hg compared with 130-139/80-89 mm Hg by averaging postrandomization clinic BP throughout pregnancy. The primary composite outcome was preeclampsia with severe features, indicated preterm birth before 35 weeks of gestation, placental abruption, or fetal or neonatal death. The secondary outcome was small for gestational age (SGA).

RESULTS

Of 2,408 patients in CHAP, 2,096 met study criteria; 1,328 had mean BP 130-139/80-89 mm Hg and 768 had mean BP below 130/80 mm Hg. Participants with mean BP below 130/80 mm Hg were more likely to be older, on antihypertensive medication, in the active treatment arm, and to have lower BP at enrollment. Mean clinic BP below 130/80 mm Hg was associated with lower frequency of the primary outcome (16.0% vs 35.8%, adjusted relative risk 0.45; 95% CI 0.38-0.54) as well as lower risk of severe preeclampsia and indicated birth before 35 weeks of gestation. There was no association with SGA.

CONCLUSION

In pregnant patients with mild chronic hypertension, mean BP below 130/80 mm Hg was associated with improved pregnancy outcomes without increased risk of SGA.

CLINICAL TRIAL REGISTRATION

ClinicalTrials.gov , NCT02299414.

Association between white blood cell count and adverse pregnancy outcomes: a retrospective cohort study from a tertiary hospital in China

OBJECTIVES

This study aimed to clarify the relationship between white blood cell (WBC) and adverse pregnancy outcomes.

DESIGN

A total of 25 270 pregnant women underwent peripheral blood white blood cell count tests in the first, second and third trimesters. Adverse pregnancy outcomes were gestational hypertension, pre-eclampsia, gestational diabetes mellitus, preterm birth, low birth weight, caesarean delivery, macrosomia and fetal distress. Due to acute infectious disease or other diseases, 1127 were excluded.

SETTING

Minhang Hospital, China.

PARTICIPANTS

A total of 24 143 pregnant women were included in this study.

PRIMARY AND SECONDARY OUTCOME MEASURES

The primary outcome was the adverse pregnancy outcomes.

RESULTS

For the 24 143 participants, we calculated adjusted ORs for adverse pregnancy outcomes associated with an increased WBC count. For gestational hypertension, the ORs were 1.18 (95% CI, 1.05 to 1.24) in the first trimester and 1.10 (1.06 to 1.13) in the second trimester; for pre-eclampsia, ORs were 1.14 (95% CI, 1.47 to 1.64) in the first trimester and 1.10 (1.05 to 1.16) in the second trimester; for gestational diabetes mellitus, ORs were 1.06 (95% CI, 1.00 to 1.13) in the first trimester and 1.10 (1.04 to 1.16) in the second trimester; for preterm birth, ORs were 1.12 (95% CI, 1.06 to 1.18) in the first trimester, 1.10 (1.06 to 1.13) in the second trimester and 1.12 (1.09 to 1.15) in the third trimester; for low birth weight, ORs were 1.09 (95% CI, 1.02 to 1.17) in the first trimester, 1.03 (0.99 to 1.08) in the second trimester and 1.12 (1.08 to 1.16) in the third trimester. Significant associations were not observed obviously for caesarean delivery, macrosomia and fetal distress.

CONCLUSIONS

Our results indicate strong, continuous associations of maternal WBC count with increased risks of adverse pregnancy outcomes.

APOL1 genotypes: Do they contribute to ethnicity-associated biological health inequalities in pregnancy?

Inferior health outcomes for people of African and Afro-Caribbean ancestry compared to those of European ancestry are well recognised. There is a disproportionate impact within these communities compared to other ethnic groups including pregnancy outcomes, hypertension, kidney disease and diabetes. The ‘Black Lives Matter’ movement has highlighted that it is imperative to examine all factors contributing to this inequity and to strive to explore multifaceted ways, including social, economic, psychological and biological to improve overall health equity. It is within this context that we discuss the novel finding of Apolipoprotein 1 genetic polymorphisms which have been identified in some populations of African ancestry. We will explore the history and evolutionary advantages of Apolipoprotein 1 polymorphisms and the pathophysiology resulting from these adaptations and examine the impact of Apolipoprotein 1 on pregnancy outcomes, the risks and benefits of screening for high-risk Apolipoprotein 1 alleles in black communities and potential treatments currently being investigated.

Trends, causes and solutions of maternal mortality in Jinan, China: the epidemiology of the MMR in 1991-2020

BACKGROUND

China was one of the few countries to achieve the Millennium Development Goals 5. China had taken many effective measures to reduce maternal mortality ratio (MMR) and has achieved encouraging progress. These measures were worth sharing for other countries to reduce the MMR, but the introduction of these measures from the national perspective was too grand, and the measures implemented in a city and the results achieved were more valuable. However, there were few studies on the prevalence and trends of prolonged maternal mortality in a city. In this study, we mainly introduced the prevalence of the MMR in Jinan,China from 1991 to 2020, analyzed the causes of trends and put forward some solutions to the difficulty existing in the process of reducing the MMR,hoping to serve as a model for some developing cities to reduce MMR.

METHODS

We collected maternal mortality data from paper records, electronic files and network platforms. The time trend of MMR was tested by Cochran-Armitage Test (CAT). We divided the study period into three stages with 10 years as a stage and the Chi-square test or Fisher's exact test was used to test the difference in MMR of different periods.

RESULTS

From 1991 to 2020, We counted 1,804,162 live births and 323 maternal deaths, and the MMR was 17.93 per 100,000 live births. The MMR declined from 44.06 per 100,000 live births in 1991 to 5.94 per 100,000 live births in 2020, with a total decline of 86.52% and an annual decline of 2.89%. The MMR declined by 88.54% in rural areas, with an average annual decline 2.95%, faster than that in urban areas (82.06, 2.73%). From 1991 to 2020, the top five causes of maternal deaths were obstetric haemorrhage (4.55 per 100,000 live births), amniotic fluid embolism (3.27 per 100,000 live births), pregnancy-induced hypertension (2.61 per 100,000 live births), heart disease (2.33 per 100,000 live births) and other medical complications (2.05 per 100,000 live births). Postpartum hemorrhage, amniotic fluid embolism, pregnancy-induced hypertension showed a downward trend (P < 0.05) and other medical complications showed an upward trend (P < 0.05).

CONCLUSIONS

Subsidy for hospitalized delivery of rural women, free prenatal check-ups for pregnant women and rapid referral system between hospitals have contributed to reducing MMR in Jinan. However, it was still necessary to strengthen the treatment of obstetric hemorrhage by ensuring blood supply, reduce the MMR due to medical complications by improving the skills of obstetricians to deal with medical diseases, and reduce the MMR by strengthening the allocation of emergency equipment in county hospitals and the skills training of doctors.

Maternal Coronary Heart Disease, Stroke, and Mortality Within 1, 3, and 5 Years of Delivery Among Women With Hypertensive Disorders of Pregnancy and Pre-Pregnancy Hypertension

Background Pre-pregnancy hypertension and hypertensive disorders of pregnancy (HDP; preeclampsia, eclampsia, gestational hypertension) are major health risks for maternal morbidity and mortality. However, it is unknown if racial/ethnic differences exist. We aimed to determine the impact of HDP and pre-pregnancy hypertension on maternal coronary heart disease, stroke, and mortality risk ≤1, 3, and 5 years post-delivery and by race/ethnicity ≤5 years. Methods and Results This retrospective cohort study included women aged 12 to 49 years with a live, singleton birth between 2004 to 2016 (n=254 491 non-Hispanic White; n=137 784 non-Hispanic Black; n=41 155 Hispanic). Birth and death certificates and International Classification of Diseases, Ninth and Tenth Revision, Clinical Modification (ICD-9-CM and ICD-10-CM) diagnosis codes in hospitalization/emergency department visit data defined HDP, pre-pregnancy hypertension, incident coronary heart disease and stroke, and all-cause mortality. During at least 1 pregnancy of the 433 430 women, 2.3% had pre-pregnancy hypertension with superimposed HDP, 15.7% had no pre-pregnancy hypertension with HDP, and 0.4% had pre-pregnancy hypertension without superimposed HDP, whereas 81.6% had neither condition. Maternal deaths from coronary heart disease, stroke, and all causes totaled 2136. Within 5 years of delivery, pre-pregnancy hypertension, and HDP were associated with all-cause mortality (hazard ratio [HR], 2.21; 95% CI, 1.61-3.03), incident coronary heart disease (HR, 3.79; 95% CI, 3.09-4.65), and incident stroke (HR, 3.10; 95% CI, 2.09-4.60). HDP alone was related to all outcomes. Race/ethnic differences were observed for non-Hispanic Black and non-Hispanic White women, respectively, in the associations of pre-pregnancy hypertension and HDP with all-cause mortality within 5 years of delivery (HR, 2.34 [95% CI, 1.58-3.47]; HR, 2.11 [95% CI, 1.23-3.65]; P interaction=0.001). Conclusions Maternal cardiovascular outcomes including mortality were increased ≤5 years post-delivery in HDP, pre-pregnancy hypertension, or pre-pregnancy hypertension with superimposed HDP. The race/ethnic interaction for all-cause mortality ≤5 years of delivery warrants further research.

Efficacy of Diltiazem for the Control of Blood Pressure in Puerperal Patients with Severe Preeclampsia: A Randomized, Single-Blind, Controlled Trial

BACKGROUND

Postpartum preeclampsia is a serious disease related to high blood pressure that occurs commonly within the first six days after delivery.

OBJECTIVE

To evaluate if diltiazem improves blood pressure parameters in early puerperium patients with severe preeclampsia. Methodology. A randomized, single-blind longitudinal clinical trial of 42 puerperal patients with severe preeclampsia was carried out. Patients were randomized into two groups: the experimental group (n = 21) received diltiazem (60 mg) and the control group (n = 21) received nifedipine (10 mg). Both drugs were orally administered every 8 hours. Systolic, diastolic, and mean blood pressures as well as the heart rate were recorded and analyzed (two-way repeated measures ANOVA) at baseline and after 6, 12, 18, 24, 30, 36, 42, and 48 hours. Primary outcome measures were all the aforementioned blood pressure parameters. Secondary outcome measures included the number of hypertension and hypotension episodes along with the length of stay in the intensive care unit.

RESULTS

No statistical differences were found between groups (diltiazem vs. nifedipine) regarding basal blood pressure parameters. Interarm differences in blood pressure (systolic, diastolic, and mean) and heart rate were statistically significant between treatment groups from 6 to 48 hours. Patients in the diltiazem group had lower blood pressure levels than patients in the nifedipine group. Significantly, patients who received diltiazem had fewer hypertension and hypotension episodes and stayed fewer days in the intensive care unit than those treated with nifedipine.

CONCLUSIONS

Diltiazem controlled arterial hypertension in a more effective and uniform manner in patients under study than nifedipine. Patients treated with diltiazem had fewer collateral effects and spent less time in the hospital. This trial is registered with NCT04222855.

Hypertension and Pregnancy: Management and Future Risks

Pregnancy-induced hypertension is a major cause of maternal and fetal morbidity and mortality. The overall strategies of defining and managing these conditions are aimed at preventing cardiovascular and cerebrovascular complications in the mother without jeopardizing fetal well-being. Our understanding of the origin of these disorders is evolving. Women with chronic hypertension should undergo a prepregnancy evaluation and close monitoring during and after pregnancy to ensure medication safety and to prevent end-organ damage. Based on available data, the current recommendation is that antihypertensive therapy should be initiated only in women with severe hypertension (defined as systolic blood pressure ≥160 mm Hg and/or diastolic blood pressure ≥105 mm Hg). It is now becoming more and more clear that hypertensive complications during pregnancy are potentially linked to cardiovascular, kidney, and metabolic diseases later in life. This review discusses the spectrum of hypertensive disorders of pregnancy, general management principles, and the need to monitor for long-term cardiovascular sequelae for decades afterward.

Knowledge, Perception and Management of Pre-eclampsia among Health Care Providers in a Maternity Hospital

BACKGROUND

Morbidity and mortality of women and children associated with pre-eclampsia present major global health problems in low and middle income countries. The prevalence of pre-eclampsia in Nigeria ranges from 2% to 16.7%, with approximately 37,000 women dying from preeclampsia annually. This study examines knowledge, perception and management of preeclampsia among healthcare providers in a major maternity hospital in Lagos, southwest Nigeria.

METHODS

In this descriptive cross-sectional study, 110 health care providers comprising of 75 Nurses, 9 Consultant Physicians, and 26 General Medical Practitioners with varying years of service were selected using purposive sampling technique. Data were collected using a self-administered 36-item semi-structured questionnaire. Data were analysed using the Statistical Package for Social Sciences to generate descriptive and inferential statistics with level of significance set at 0.05.

RESULTS

Health care providers in the study had an average knowledge of pre-eclampsia with a mean score of 16.69±3.53. There was generally a good perception of pre-eclampsia with a mean sore of 28.31±3.71. The most-prevalent clinical management practices were emergency cesarean section (16%), magnesium sulphate infusion (29%), and fluid/electrolyte management (9%). Knowledge of pre-eclampsia and years of practice were significantly associated (F=3.31; p= 0.023).

CONCLUSION AND GLOBAL HEALTH IMPLICATIONS

Gaps in the knowledge of causes, diagnoses, and treatment of pre-eclampsia may be attributable to lack of refresher trainings and absence of written practice guidelines on pre-eclampsia management. Health care providers at this hospital may benefit from training courses that include current nationally and internationally-approved management of pre-eclampsia.

Knowledge of hypertensive disorders in pregnancy of Moroccan women in Morocco and in the Netherlands: a qualitative interview study

Background

Hypertensive disorders in pregnancy (HDP) are the most common medical disorders in pregnancy and the greatest single cause of maternal mortality worldwide. Ethnicity appears to be a significant risk factor for pregnancy related mortality and for severe maternal morbidity. Most of the complications caused by HDP may be reduced by early detection and proper management. Health education during antenatal care attendance may play an important role in preventing the disease to aggravate. The purpose of this study was to investigate the status of knowledge that Moroccan pregnant women, both in Morocco and in the Netherlands, have of HDP in terms of symptoms, complications, treatment and management.

Methods

A qualitative research design was used to explore and describe the knowledge of HDP of pregnant Moroccan women. Interviews were held on the basis of a topic list. The interviews were recorded, transcribed, coded and analysed.

Results

Nineteen Moroccan women were interviewed, nine in the Netherlands and ten in Morocco. Half of them never heard about hypertension in pregnancy and had no knowledge of symptoms or alarm signals related to HDP. All women acknowledged the importance of knowledge of HDP because of the possibly dangerous complications. The interviewees stated that information on symptoms, alarm signs and complications is the most important information. Nearly all women stated that communicating information via movies was the most appropriate tool to inform Moroccan pregnant women about HDP.

Conclusions

The knowledge of Moroccan women, living in Morocco or in the Netherlands, of symptoms and alarm signs related to hypertensive disorders of pregnancy was very limited, if not absent. Since early detection provides the opportunity for follow-up management and/or treatment, this may reduce complications of HDP. Therefore, it is important to inform pregnant women about the signs and symptoms of HDP.

Electronic supplementary material

The online version of this article (10.1186/s12884-018-1980-1) contains supplementary material, which is available to authorized users.

Effect of Lactation on myocardial vulnerability to ischemic insult in rats

Background

Cardiovascular diseases are the leading cause of mortality and long-term disability worldwide. Various studies have suggested a protective effect of lactation in reducing the risk of cardiovascular diseases.

Objective

This study was designed to assess the effects of pregnancy and lactation on the vulnerability of the myocardium to an ischemic insult.

Methods

Eighteen female rats were randomly divided into three groups: ischemia-reperfusion (IR), in which the hearts of virgin rats underwent IR (n = 6); lactating, in which the rats nursed their pups for 3 weeks and the maternal hearts were then submitted to IR (n = 6); and non-lactating, in which the pups were separated after birth and the maternal hearts were submitted to IR (n = 6). Outcome measures included heart rate (HR), left ventricular developed pressure (LVDP), rate pressure product (RPP), ratio of the infarct size to the area at risk (IS/AAR %), and ventricular arrhythmias - premature ventricular contraction (PVC) and ventricular tachycardia (VT).

Results

The IS/AAR was markedly decreased in the lactating group when compared with the non-lactating group (13.2 ± 2.5 versus 39.7 ± 3.5, p < 0.001) and the IR group (13.2 ± 2.5 versus 34.0 ± 4.7, p < 0.05). The evaluation of IR-induced ventricular arrhythmias indicated that the number of compound PVCs during ischemia, and the number and duration of VTs during ischemia and in the first 5 minutes of reperfusion in the non-lactating group were significantly (p < 0.05) higher than those in the lactating and IR groups.

Conclusion

Lactation induced early-onset cardioprotective effects, while rats that were not allowed to nurse their pups were more susceptible to myocardial IR injury.

Less-tight versus tight control of hypertension in pregnancy

BACKGROUND

The effects of less-tight versus tight control of hypertension on pregnancy complications are unclear.

METHODS

We performed an open, international, multicenter trial involving women at 14 weeks 0 days to 33 weeks 6 days of gestation who had nonproteinuric preexisting or gestational hypertension, office diastolic blood pressure of 90 to 105 mm Hg (or 85 to 105 mm Hg if the woman was taking antihypertensive medications), and a live fetus. Women were randomly assigned to less-tight control (target diastolic blood pressure, 100 mm Hg) or tight control (target diastolic blood pressure, 85 mm Hg). The composite primary outcome was pregnancy loss or high-level neonatal care for more than 48 hours during the first 28 postnatal days. The secondary outcome was serious maternal complications occurring up to 6 weeks post partum or until hospital discharge, whichever was later.

RESULTS

Included in the analysis were 987 women; 74.6% had preexisting hypertension. The primary-outcome rates were similar among 493 women assigned to less-tight control and 488 women assigned to tight control (31.4% and 30.7%, respectively; adjusted odds ratio, 1.02; 95% confidence interval [CI], 0.77 to 1.35), as were the rates of serious maternal complications (3.7% and 2.0%, respectively; adjusted odds ratio, 1.74; 95% CI, 0.79 to 3.84), despite a mean diastolic blood pressure that was higher in the less-tight-control group by 4.6 mm Hg (95% CI, 3.7 to 5.4). Severe hypertension (≥160/110 mm Hg) developed in 40.6% of the women in the less-tight-control group and 27.5% of the women in the tight-control group (P<0.001).

CONCLUSIONS

We found no significant between-group differences in the risk of pregnancy loss, high-level neonatal care, or overall maternal complications, although less-tight control was associated with a significantly higher frequency of severe maternal hypertension. (Funded by the Canadian Institutes of Health Research; CHIPS Current Controlled Trials number, ISRCTN71416914; ClinicalTrials.gov number, NCT01192412.).

A prospective population-based cohort study of lactation and cardiovascular disease mortality: the HUNT study

Background

Recent studies suggest that lactation has long-term effects on risk for cardiovascular disease in women, but the effects on cardiovascular mortality are less well known.

Method

In a Norwegian population-based prospective cohort study, we studied the association of lifetime duration of lactation with cardiovascular mortality in 21,889 women aged 30 to 85 years who attended the second Nord-Trøndelag Health Survey (HUNT2) in 1995–1997. The cohort was followed for mortality through 2010 by a linkage with the Cause of Death Registry. Adjusted hazard ratios (HR) for death from all causes and cardiovascular disease were calculated using Cox regression.

Results

During follow-up, 1,246 women died from cardiovascular disease. Parous women younger than 65 years who had never lactated had a higher cardiovascular mortality than the reference group of women who had lactated 24 months or more (HR 2.77, 95% confidence interval [CI]: 1.28, 5.99). There was some evidence of a U-shaped association, where women who reported lactating 7–12 months had a HR of 0.55 (95% CI: 0.27, 1.09). No clear associations were observed among women 65 years or older.

Conclusions

Excess cardiovascular mortality rates were observed among parous women younger than 65 years who had never lactated. These findings support the hypothesis that lactation may have long-term influences on maternal cardiovascular health.

The effect of Porphyromonas gingivalis lipopolysaccharide on pregnancy in the rat

OBJECTIVE

Periodontitis, mostly associated with Porphyromonas gingivalis, has frequently been related to adverse pregnancy outcomes. We therefore investigated whether lipopolysaccharides of P. gingivalis (Pg-LPS) induced pregnancy complications in the rat.

METHODS

Experiment 1: pregnant rats (day 14) received increasing Pg-LPS doses (0.0-50.0 μg kg(-1) bw; n = 2/3 p per dose). Maternal intra-aortic blood pressure, urinary albumin excretion, placental and foetal weight and foetal resorptions were documented. Experiment 2: 10.0 μg kg(-1) bw (which induced the highest blood pressure together with decreased foetal weight in experiment 1) or saline was infused in pregnant and non-pregnant rats (n = 7/9 p per group). Parameters of experiment 1 and numbers of peripheral leucocytes as well as signs of inflammation in the kidney and placenta were evaluated.

RESULTS

Pg-LPS infusion in pregnant rats increased maternal systolic blood pressure, reduced placental weight (dose dependently) and decreased foetal weight and induced foetal resorptions. It, however, did not induce proteinuria or a generalised inflammatory response. No effects of Pg-LPS were seen in non-pregnant rats.

CONCLUSION

Pg-LPS increased maternal blood pressure, induced placental and foetal growth restriction, and increased foetal resorptions, without inducing proteinuria and inflammation. Pg-LPS may therefore play a role in pregnancy complications induced by periodontitis.

When the Heart Stops

Cardiac arrest is a rare occurrence in pregnancy and may be related to obstetric or medical causes. Pregnancy is associated with profound physiologic changes that prepare the gravida for the challenges of labor and delivery, and resuscitation of the pregnant patient needs to take these changes into consideration. Cardiac output and plasma volume increase in pregnancy and distribute differently with the uterine circulation receiving approximately 17% of the total cardiac output. On the other hand, cardiac output is sensitive to positional changes in the second half of pregnancy but may improve with a lateral tilt of the gravida. Both oxygen reserve and upper airway size decrease in pregnancy, leading to difficulties surrounding airway management. Changes in the volume of distribution, renal and hepatic clearance may impact drug effects and need to be recognized. This review will discuss an overview of pregnancy physiology that is relevant to cardiac resuscitation, detail the challenges in the various resuscitative steps including a synopsis on perimortem delivery, and describe obstetric and nonobstetric causes of mortality and cardiac arrest in pregnancy.

Prolonged breast-feeding protects mothers from later-life obesity and related cardio-metabolic disorders

Objective

To investigate the long-term effects of duration of postpartum lactation on maternal body composition and risk for cardio-metabolic disorders in later life.

Design

Retrospective study. Body composition was measured using dual-energy X-ray absorptiometry and serum glucose, insulin and lipids were analysed using enzymatic photometric methods 16–20 years after the last pregnancy. Medical history and lifestyle factors were collected via a self-administered questionnaire. Detailed information regarding weight change patterns during each pregnancy was obtained from personal maternity tracking records.

Setting

City of Jyväskylä and surroundings in Central Finland.

Subjects

Two hundred and twelve women (mean age 48, range 36–60 years).

Results

At 16–20 years after their last pregnancy, women who had breast-fed for less than 6 months had higher total body fat mass and fat mass percentage, particularly in the android region (46·5 (sd8·2) %) than mothers who had breast-fed for longer than 6 months (39·0 (sd10·2) %) or for longer than 10 months (38·4 (sd10·9) %,P< 0·01). These differences were independent of pre-pregnancy weight and BMI, menopausal status, smoking status, level of education, participation in past and present leisure-time physical activity, and current dietary energy intake. Higher body fat mass was also associated with higher fasting serum glucose concentration and insulin resistance, TAG, LDL cholesterol and total cholesterol concentrations, as well as higher systolic and diastolic blood pressure (P< 0·05 for all).

Conclusions

Short duration of breast-feeding may induce weight retention and fat mass accumulation, resulting in increased risk of cardio-metabolic disorders in later life.

Molecular and vascular targets in the pathogenesis and management of the hypertension associated with preeclampsia

Normal pregnancy is associated with significant hemodynamic changes and vasodilation of the uterine and systemic circulation in order to meet the metabolic demands of the mother and developing fetus. Preeclampsia (PE) is one of the foremost complications of pregnancy and a major cause of maternal and fetal mortality. The pathophysiological mechanisms of PE have been elusive, but some parts of the puzzle have begun to unravel. Genetic factors such as leptin gene polymorphism, environmental and dietary factors such as Ca(2+) and vitamin D deficiency, and co-morbidities such as obesity and diabetes may increase the susceptibility of pregnant women to develop PE. An altered maternal immune response may also play a role in the development of PE. Although the pathophysiology of PE is unclear, most studies have implicated inadequate invasion of cytotrophoblasts into the uterine artery, leading to reduced uteroplacental perfusion pressure (RUPP) and placental ischemia/hypoxia. Placental ischemia induces the release of biologically active factors such as growth factor inhibitors, anti-angiogenic factors, inflammatory cytokines, reactive oxygen species, hypoxia-inducible factors, and antibodies to vascular angiotensin II (AngII) receptor. These bioactive factors could cause vascular endotheliosis and consequent increase in vascular resistance and blood pressure, as well as glomerular endotheliosis with consequent proteinuria. The PE-associated vascular endotheliosis could be manifested as decreased vasodilator mediators such as nitric oxide, prostacyclin and hyperpolarizing factor and increased vasoconstrictor mediators such as endothelin-1, AngII and thromboxane A₂. PE could also involve enhanced mechanisms of vascular smooth muscle contraction including intracellular Ca(2+), and Ca(2+) sensitization pathways such as protein kinase C and Rho-kinase. PE-associated changes in the extracellular matrix composition and matrix metalloproteinases activity also promote vascular remodeling and further vasoconstriction in the uterine and systemic circulation. Some of these biologically active factors and vascular mediators have been proposed as biomarkers for early prediction or diagnosis of PE, and as potential targets for prevention or treatment of the disease.