Physical Activity During Pregnancy and Subsequent Risk of Preeclampsia and Gestational Hypertension: A Case Control Study

Physical activity (PA) is hypothesized to reduce the risk of preeclampsia, but few epidemiologic studies have simultaneously evaluated leisure time PA (LTPA), sedentary activity, occupational activity, and non-occupational, non-leisure time PA. Thus, we assessed the independent and combined effects of these different types of PA during pregnancy on preeclampsia and gestational hypertension risk

A probabilistic sampling method (PSM) for estimating geographic distance to health services when only the region of residence is known

<p>Abstract</p> <p>Background</p> <p>The need to estimate the distance from an individual to a service provider is common in public health research. However, estimated distances are often imprecise and, we suspect, biased due to a lack of specific residential location data. In many cases, to protect subject confidentiality, data sets contain only a ZIP Code or a county.</p> <p>Results</p> <p>This paper describes an algorithm, known as "the probabilistic sampling method" (PSM), which was used to create a distribution of estimated distances to a health facility for a person whose region of residence was known, but for which demographic details and centroids were known for smaller areas within the region. From this distribution, the median distance is the most likely distance to the facility. The algorithm, using Monte Carlo sampling methods, drew a probabilistic sample of all the smaller areas (Census blocks) within each participant's reported region (ZIP Code), weighting these areas by the number of residents in the same age group as the participant. To test the PSM, we used data from a large cross-sectional study that screened women at a clinic for intimate partner violence (IPV). We had data on each woman's age and ZIP Code, but no precise residential address. We used the PSM to select a sample of census blocks, then calculated network distances from each census block's centroid to the closest IPV facility, resulting in a distribution of distances from these locations to the geocoded locations of known IPV services. We selected the median distance as the most likely distance traveled and computed confidence intervals that describe the shortest and longest distance within which any given percent of the distance estimates lie. We compared our results to those obtained using two other geocoding approaches. We show that one method overestimated the most likely distance and the other underestimated it. Neither of the alternative methods produced confidence intervals for the distance estimates. The algorithm was implemented in R code.</p> <p>Conclusions</p> <p>The PSM has a number of benefits over traditional geocoding approaches. This methodology improves the precision of estimates of geographic access to services when complete residential address information is unavailable and, by computing the expected distribution of possible distances for any respondent and associated distance confidence limits, sensitivity analyses on distance access measures are possible. Faulty or imprecise distance measures may compromise decisions about service location and misdirect scarce resources.</p

Work, Leisure-Time Physical Activity, and Risk of Preeclampsia and Gestational Hypertension

Few studies of preeclampsia have assessed physical activity level, yet recent evidence suggests that the pathologic mechanisms in preeclampsia are similar to those in cardiovascular disease, for which physical activity is shown to be protective. The authors assessed the independent and combined effects of work and regular leisure-time physical activity (LTPA) during early pregnancy on risk of de novo preeclampsia (n = 44) and gestational hypertension (n = 172) among women recruited from 13 obstetric practices in the New Haven, Connecticut, area between 1988 and 1991. Control subjects were normotensive throughout pregnancy (n = 2,422). Information on time at work spent sitting, standing, and walking and on LTPA before and during pregnancy was collected via face-to-face interviews. Logistic regression analyses suggested that women who engaged in any regular LTPA regardless of caloric expenditure (adjusted odds ratio (aOR) = 0.66, 95% confidence interval (CI): 0.35, 1.22), were unemployed (aOR = 0.64, 95% CI: 0.21, 2.00), or had nonsedentary jobs (aOR = 0.71, 95% CI: 0.37, 1.36) were at decreased risk of preeclampsia. Analyses of gestational hypertension showed no indication of a protective effect of workplace activity, LTPA, or unemployment. Consistent with other studies, these data suggest that regular physical activity during pregnancy may reduce preeclampsia risk. employment; exercise; hypertension; motor activity; pre-eclampsia; pregnancy Abbreviations: aOR, adjusted odds ratio; CI, confidence interval; LTPA, leisure-time physical activity. Preeclampsia is a disease specific to human pregnancy, marked by hypertension and proteinuria. Despite decades of preventive efforts, preeclampsia remains a leading cause of maternal and perinatal morbidity and mortality worldwide (1). Research into its epidemiology and pathophysiology suggests that preeclampsia is a condition of heterogeneous causes characterized by a two-stage disease process (1). The first stage is punctuated by shallow, insufficient placentation, which is likely immune mediated (2), followed by systemic activation and disruption of the vascular endothelium with progression to the maternal syndrome (stage 2) (3). Oxidative stress is regarded as the mechanism most likely to cause endothelial dysfunction characteristic of preeclamptic pregnancies (4). Findings from the epidemiologic literature provide rational support for this mechanistic model. Factors consistent with an immune-based etiology include the higher risk after partner change among multiparous women with no prior preeclampsia (5-8), a short duration of sexual activity with the baby&apos;s father at the time of conception (9), and conception aided by donor insemination or embryos (10, 11), as well as a protective effect of abortion among nulliparous women who conceive again with the same father (12). Numerous lines of evidence implicate oxidative stress as a causal mechanism. Cardiovascular disease and preeclampsia share both a common disease pathway (i.e., endothelial activation) and many of the same constitutional risk factors, including hypertension, dyslipidemia, insulin resistance, an

Genetic Risk Score for Essential Hypertension and Risk of Preeclampsia

Preeclampsia is a hypertensive complication of pregnancy characterized by novel onset of hypertension after 20 weeks gestation, accompanied by proteinuria. Epidemiological evidence suggests that genetic susceptibility exists for preeclampsia; however, whether preeclampsia is the result of underlying genetic risk for essential hypertension has yet to be investigated. Based on the hypertensive state that is characteristic of preeclampsia, we aimed to determine if established genetic risk scores (GRSs) for hypertension and blood pressure are associated with preeclampsia

Risk Factors for Maternal Injuries in a Population-Based Sample of Pregnant Women

Background: The prevalence of injuries during pregnancy is largely underestimated, as previous research has focused on more severe injuries resulting in emergency department visits and hospitalizations. The objective of our study was to estimate the frequency, risk factors, and causes of injuries in a population-based sample of pregnant women. Methods: This article is an analysis of postpartum interviews among the control series from a case-control study (n=1,488). Maternal, pregnancy, and environmental characteristics associated with injury during pregnancy in control subjects were examined to identify population-based risk factors for injury. We collected data on self-reported injury during pregnancy, including the month of pregnancy, whether medical attention was sought, the mechanism of injury, and the number and location of bodily injuries. Logistic regression was used to calculate unadjusted and adjusted odds ratios (aORs) of injury. Results: Over 5% of women reported an injury during pregnancy, with falls being the most common mechanism of injury. Women at highest adjusted risk for injury had unintended pregnancies (aOR: 2.28 [1.40–3.70]) and no partner during pregnancy (aOR: 2.45 [1.16–5.17]) relative to women without injuries. Conclusions: Pregnant women with risk factors for many pregnancy-related complications are also at increased risk of injury during pregnancy. Further studies of pregnancy-related injuries are needed to consider environmental and maternal characteristics on risk of injury

Risk Factors for Maternal Injuries in a Population-Based Sample of Pregnant Women

Background: The prevalence of injuries during pregnancy is largely underestimated, as previous research has focused on more severe injuries resulting in emergency department visits and hospitalizations. The objective of our study was to estimate the frequency, risk factors, and causes of injuries in a population-based sample of pregnant women. Methods: This article is an analysis of postpartum interviews among the control series from a case-control study (n=1,488). Maternal, pregnancy, and environmental characteristics associated with injury during pregnancy in control subjects were examined to identify population-based risk factors for injury. We collected data on self-reported injury during pregnancy, including the month of pregnancy, whether medical attention was sought, the mechanism of injury, and the number and location of bodily injuries. Logistic regression was used to calculate unadjusted and adjusted odds ratios (aORs) of injury. Results: Over 5% of women reported an injury during pregnancy, with falls being the most common mechanism of injury. Women at highest adjusted risk for injury had unintended pregnancies (aOR: 2.28 [1.40–3.70]) and no partner during pregnancy (aOR: 2.45 [1.16–5.17]) relative to women without injuries. Conclusions: Pregnant women with risk factors for many pregnancy-related complications are also at increased risk of injury during pregnancy. Further studies of pregnancy-related injuries are needed to consider environmental and maternal characteristics on risk of injury

Does Loop Electrosurgical Excision Procedure of the Uterine Cervix Affect Anti-Müllerian Hormone Levels?

Background. A delayed time to pregnancy was recently reported for women who had a loop electrosurgical excision procedure (LEEP) to remove cervical intraepithelial neoplasia (CIN) grade 2 or 3. The objective of the current study was to determine if treatment of CIN with LEEP is associated with decreased levels of anti-Müllerian hormone (AMH), a marker of ovarian reserve. Methods. AMH levels were measured in 18 women treated with LEEP and 18 age-matched controls, who had colposcopy only and did not require LEEP. Cases and controls had their blood drawn at study entry time zero and again 6 months later. Results. The mean AMH level decreased significantly from baseline to follow-up; however, no significant differences were observed when stratifying by LEEP status, suggesting that both groups experienced a similar decrease in AMH levels during the follow-up period. Although women treated with LEEP had lower overall AMH levels than controls at both baseline and follow-up, these differences were not statistically significant. Conclusion. Overall, the delayed time to pregnancy observed in women treated with LEEP is likely not due to a LEEP-associated decrease in ovarian reserve as measured by AMH; thus, other mechanism are responsible for the delayed time to pregnancy associated with LEEP

Presence of children in the home and intimate partner violence among women seeking elective pregnancy termination.

Growing evidence identifies adverse health effects for children who witness intimate partner violence at home. Research has also identified that women seeking elective pregnancy termination are at high risk for partner violence. However, little is known about the risk for violence exposure among the children of women seeking elective pregnancy termination.We conducted a cross-sectional study of 957 women seeking elective pregnancy termination at a large family planning clinic. All subjects completed a 10-minute, anonymous questionnaire administered by computer in a private room. Our main outcome was 12-month prevalence of physical and/or sexual violence by a current or former partner using the Abuse Assessment Screen instrument. The presence of children under the age of 18 living with the respondent was the main exposure variable.Women with children in the home had more than twice the odds of reporting physical and/or sexual IPV in the past year than women with no children, controlling for age (AOR: 2.23; 95% CI: 1.41-3.85). The increased odds of IPV among women with children as compared to women with no children was present across nearly all sociodemographic and lifestyle characteristics, and significantly higher for the youngest women (18-20 years). The highest odds for abuse occurred among women with children living at home, in a current relationship but not living with their current partner, and abused by a former partner (AOR = 10.9; 95% CI: 3.07-38.4).Nearly one of every 14 children identified in this study lived in a home with IPV. These findings support the development of IPV interventions that are family-centered, as well as the integration of trauma-informed care into healthcare settings. Healthcare visits for contraception and pregnancy termination may be ideal opportunities for implementation of screening and family violence interventions

Does Loop Electrosurgical Excision Procedure of the Uterine Cervix Affect Anti-Müllerian Hormone Levels?

Background. A delayed time to pregnancy was recently reported for women who had a loop electrosurgical excision procedure (LEEP) to remove cervical intraepithelial neoplasia (CIN) grade 2 or 3. The objective of the current study was to determine if treatment of CIN with LEEP is associated with decreased levels of anti-Müllerian hormone (AMH), a marker of ovarian reserve. Methods. AMH levels were measured in 18 women treated with LEEP and 18 age-matched controls, who had colposcopy only and did not require LEEP. Cases and controls had their blood drawn at study entry time zero and again 6 months later. Results. The mean AMH level decreased significantly from baseline to follow-up; however, no significant differences were observed when stratifying by LEEP status, suggesting that both groups experienced a similar decrease in AMH levels during the follow-up period. Although women treated with LEEP had lower overall AMH levels than controls at both baseline and follow-up, these differences were not statistically significant. Conclusion. Overall, the delayed time to pregnancy observed in women treated with LEEP is likely not due to a LEEP-associated decrease in ovarian reserve as measured by AMH; thus, other mechanism are responsible for the delayed time to pregnancy associated with LEEP