Prenatal and postnatal mercury exposure and blood pressure in childhood.

Elevated blood pressure in childhood is an important risk factor for hypertension in adulthood. Environmental exposures have been associated with elevated blood pressure over the life course and exposure to mercury (Hg) has been linked to cardiovascular effects in adults. As subclinical vascular changes begin early in life, Hg may play a role in altered blood pressure in children. However, the evidence linking early life Hg exposure to altered blood pressure in childhood has been largely inconsistent. In the ongoing New Hampshire Birth Cohort Study, we investigated prenatal and childhood Hg exposure at multiple time points and associations with blood pressure measurements in 395 young children (mean age 5.5 years, SD 0.4). Hg exposure was measured in children's toenail clippings at age 3 and in urine at age 5-6 years, as well as in maternal toenail samples collected at ∼28 weeks gestation and 6 weeks postpartum, the latter two samples reflecting early prenatal and mid-gestation exposures, respectively. Five measurements of systolic blood pressure (SBP), diastolic blood pressure (DBP) and mean arterial pressure (MAP) were averaged for each child using a standardized technique. In covariate-adjusted linear regression analyses, we observed that a 0.1 µg/g increase in child toenail Hg at age 3 or a 0.1 µg/L urine Hg at age 5-6 were individually associated with greater DBP (toenail ß: 0.53 mmHg; 95% CI: -0.02, 1.07; urine ß: 0.48 mmHg; 95% CI: 0.10, 0.86) and MAP (toenail ß: 0.67 mmHg; 95% CI: 0.002, 1.33; urine ß: 0.55 mmHg; 95% CI: 0.10, 1.01). Neither early prenatal nor mid-gestation Hg exposure, as measured by maternal toenails, were related to any changes to child BP. Simultaneous inclusion of both child urine Hg and child toenail Hg in models suggested a potentially stronger relationship of urine Hg at age 5-6 with DBP and MAP, as compared to toenail Hg at age 3. Our findings suggest that Hg exposure during childhood is associated with alterations in BP. Childhood may be an important window of opportunity to reduce the impacts of Hg exposure on children's blood pressure, and in turn, long-term health.

Enhancing Empathy in Medical Students: Family-Faculty Members Facilitate Patient-Centered Reflection.

Parents of children with medical complexity can serve as family-faculty in undergraduate medical education. Medical students can learn about family-centered care through structured interviews, reflective writing, and classroom discussions with family-faculty.

Seizure as the Presenting Symptom for Atypical Hemolytic Uremic Syndrome.

BACKGROUND: Atypical hemolytic uremic syndrome (aHUS) is a complement-mediated disease manifesting in thrombocytopenia, microangiopathic hemolytic anemia, and acute kidney injury. It has a higher incidence of extrarenal manifestations, including central nervous system findings like seizure or stroke, pancreatitis, and cardiac manifestations. CASE REPORT: We present a case of an unimmunized 14-month-old girl presenting with generalized seizure and ultimately diagnosed with aHUS. WHY SHOULD AN EMERGENCY PHYSICIAN BE AWARE OF THIS?: These atypical neurological symptoms can cause the diagnosis to be commonly missed in the emergency department. The etiology of approximately 60% of patients with aHUS can be attributed to genetic mutations in complement regulators including factor H, membrane cofactor protein, factor I, activator factor B, or C3. Although previously treated with plasma transfusion and immunosuppressants, eculizumab is a newer treatment that has been changing prognosis and management of aHUS, but it should be administered within 48 h of symptom onset for best efficacy.

Prenatal lead exposure and elevated blood pressure in children.

Growing evidence suggests that environmental exposures can influence blood pressure over the course of a lifetime. Exposure to toxic metals, such as lead (Pb) and arsenic (As), has been associated with increased blood pressure in adults, but few studies have examined the impacts of in utero and early life toxic metals exposure on blood pressure in childhood. As subclinical vascular changes are thought to begin early in life, it is possible that in utero toxic metals exposure may play a role in blood pressure homeostasis. In the ongoing New Hampshire Birth Cohort Study, we investigated whether in utero exposure to Pb and As was associated with measures of blood pressure in a total of 323 young children (mean age 5.5 years, SD 0.4). Pb and As were measured in maternal toenail samples collected at ~28 weeks gestation (n = 257) and/or 6 weeks postpartum (n = 285), which represent exposures ~6 to 12 months prior to collection and therefore reflect the early prenatal and late prenatal exposures, respectively. Five measurements of systolic blood pressure (SBP) and diastolic blood pressure (DBP) were averaged for each child using a standardized technique. In linear regression analyses, where log2-transformed prenatal toenail Pb and As were modeled jointly and adjusted for child age, sex, height, weight and maternal smoking during pregnancy, we observed that a doubling of maternal prenatal toenail Pb was associated with statistically significant increases in child SBP (ß: 0.58 mm Hg, 95% CI: 0.05, 1.11). We did not observe any association of prenatal or postpartum As, or postpartum Pb, with SBP or DBP. Exploratory sex-stratified analyses suggest that associations of prenatal Pb with BP may be stronger among boys (SBP ß: 0.72 mm Hg: 95% CI: -0.01, 1.44; DBP ß: 0.37; 95% CI: -0.09, 0.84), compared to girls (SBP ß: 0.48 mm Hg: 95% CI: -0.31, 1.26; DBP ß: -0.05; 95% CI: -0.52, 0.41), though tests for interaction did not reach statistical significance (p-interaction SBP = 0.059; DBP = 0.057). Our preliminary results suggest that in utero toxic metals exposures may be associated with early life increases in blood pressure in children, which could have consequences for long-term health.

Factors influencing pediatric nephrology trainee entry into the workforce.

BACKGROUND AND OBJECTIVES: Emerging needs in pediatric nephrology (PN) have made the number of nephrologists entering the workforce of critical importance. This study aimed to discern factors that influence PN fellows to choose their career path and decide to enter the PN workforce. DESIGN, SETTING, PARTICIPANTS, & MEASUREMENTS: A survey was sent to the American Society of Pediatric Nephrology list of PN fellows (n = 103) in 2008. The 57 fellows (55%) who completed the survey were representative of the group. RESULTS: The majority decided on a career in PN as senior residents, most commonly due to their interest in renal physiology and academics. They felt residents chose other fields due to lack of interest/exposure to PN, financial constraints, and perceived PN workload. Fellows identified workload and their perception of faculty dissatisfaction as important concerns with PN. None of the respondents planned to leave fellowship, but 21% have considered this. Twenty-eight percent knew a PN fellow who resigned, thought to be due to workload, personal conflicts, and perceived faculty dissatisfaction. CONCLUSIONS: Exposing residents to PN earlier in training and emphasizing positive features may create greater interest in PN. PN programs should be cognizant of workload and the influence of faculty dissatisfaction. Ongoing evaluation of PN fellow perceptions can assist in efforts to enhance recruitment and retention.