Abstract:
:Evaluation of nonlinear heart rate (HR) dynamics has received considerable attention in the pediatric literature because such analyses not only provide insight into underlying control mechanisms, but may also help to differentiate between normal and abnormal infants. The purpose of this study was to determine, in eight low risk human fetuses, if nonlinear HR dynamics could be identified by analyzing the dispersion of interbeat intervals at slow (Ds) and fast (Df) HRs. The fetal cardiac electrical signal was captured transabdominally at a resolution of +/- 1 ms. To test the null hypothesis, that the time series is the result of a linear stochastic process, Ds and Df for the original time series were compared with the values calculated for three linear models. The linear models were constructed to preserve the major statistical properties of the original time series, including the mean, SD, and the Fourier power spectrum. For each fetus, there was no evidence of nonlinear cardiac dynamics based on analyses of Ds and Df. In contrast, the distribution of adjacent R-R intervals and the pattern of change across three successive interbeat intervals both revealed significant nonlinearities in HR control in each fetus. If the difference between normal and abnormal infants is the result of aberrant control of nonlinear processes, then our findings indicate that parameters which describe the nonlinearity may be more useful then Ds and Df in assigning a risk status.
journal_name
Pediatr Resjournal_title
Pediatric researchauthors
Mooney DM,Groome LJ,Holland SB,Smith YDdoi
10.1203/00006450-199807000-00018subject
Has Abstractpub_date
1998-07-01 00:00:00pages
111-8issue
1eissn
0031-3998issn
1530-0447journal_volume
44pub_type
杂志文章abstract::The purpose of the present study was to determine if autoregulation of cerebral blood flow (CBF) is present in the preterm fetal lamb and, if present, to measure the range of mean arterial blood pressure over which autoregulation exists. Thirty-seven measurements of CBF were made in seven preterm fetal lambs (118-122 ...
journal_title:Pediatric research
pub_type: 杂志文章
doi:10.1203/00006450-198502000-00001
更新日期:1985-02-01 00:00:00
abstract::The effects on the conceptus of persistently decreased maternal plasma amino acid concentrations were studied in pregnant rats by the infusion of glucagon (0.21 mg/day) to the mother from day 14 to 20 of gestation with a subcutaneous, osmotically driven minipump. Controls received diluent. The experimental animals eit...
journal_title:Pediatric research
pub_type: 杂志文章
doi:10.1203/00006450-198611000-00002
更新日期:1986-11-01 00:00:00
abstract:BACKGROUND:Serum caffeine concentrations >20 μg/ml (100 μmol/l) in infants treated for apnea of prematurity increases TNF-α and decreases IL-10, changes that perhaps are linked to comorbidities. We hypothesize that this proinflammatory cytokine profile may be linked to differential binding of caffeine to adenosine rece...
journal_title:Pediatric research
pub_type: 杂志文章
doi:10.1038/pr.2016.50
更新日期:2016-07-01 00:00:00
abstract::In persistent hyperinsulinemic hypoglycemia of infancy, ketone body concentrations are abnormally low at times of hypoglycemia, depriving the brain of its most important alternative fuel. The neuroprotective effect of endogenous ketone bodies is evidenced by animal and human studies, but knowledge about exogenous supp...
journal_title:Pediatric research
pub_type: 临床试验,杂志文章
doi:10.1203/00006450-200208000-00025
更新日期:2002-08-01 00:00:00
abstract::Uteroplacental insufficiency and subsequent intrauterine growth retardation (IUGR) increase the risk of insulin resistance in humans and rats. Aberrant skeletal muscle lipid metabolism contributes to the pathogenesis of insulin resistance. Peroxisome proliferator-activated receptor-gamma co-activator-1 (PGC-1) is a tr...
journal_title:Pediatric research
pub_type: 杂志文章
doi:10.1203/01.PDR.0000064583.40495.51
更新日期:2003-06-01 00:00:00
abstract:BACKGROUND:Oral propranolol, a nonselective β-blocker, is able to reduce the progression of retinopathy of prematurity in newborns, but it appeared unsafe. This study aimed to find, in rabbits, a propranolol eye drop concentration able to induce lower plasma but higher retinal concentrations than those obtained after o...
journal_title:Pediatric research
pub_type: 杂志文章
doi:10.1038/pr.2014.108
更新日期:2014-10-01 00:00:00
abstract::Hypoxic ischemia is a common cause of damage to the fetal and neonatal brain. Although systemic and cerebrovascular physiologic factors play an important role in the initial phases of hypoxic-ischemic injuries, the intrinsic vulnerability of specific cell types and systems in the developing brain may be more important...
journal_title:Pediatric research
pub_type: 杂志文章,评审
doi:10.1203/00006450-200106000-00003
更新日期:2001-06-01 00:00:00
abstract:BACKGROUND:Human milk oligosaccharides (HMOs) shape the intestinal microbiota in term infants. In premature infants, alterations in the intestinal microbiota (dysbiosis) are associated with risk of necrotizing enterocolitis (NEC) and sepsis, and the influence of HMOs on the microbiota is unclear. METHODS:Milk, urine, ...
journal_title:Pediatric research
pub_type: 临床试验,杂志文章
doi:10.1038/pr.2015.162
更新日期:2015-12-01 00:00:00
abstract:IMPACT:Raises the importance of Social Determinants of Health in pediatrics. Considers the impact of Social Determinants of Health on COVID-19. Offers opportunities for research in the future. ...
journal_title:Pediatric research
pub_type: 杂志文章
doi:10.1038/s41390-020-01253-0
更新日期:2020-11-10 00:00:00
abstract::We investigated, using a human placental choriocarcinoma cell line as a model, the effects of the immunosuppressive drug cyclosporin A on several placental transport systems mediating the transfer of glucose and amino acids from mother to fetus. The results of the investigation show that the transport system responsib...
journal_title:Pediatric research
pub_type: 杂志文章
doi:10.1203/00006450-199207000-00024
更新日期:1992-07-01 00:00:00
abstract::Lung deposition of inhaled drugs in ventilated neonates has been studied in models of questionable relevance. With conventional nebulizers, pulmonary deposition has been limited to 1% of the total dose. The objective of this study was to assess lung delivery of aerosols in a model of neonatal ventilation using a conve...
journal_title:Pediatric research
pub_type: 杂志文章
doi:10.1203/01.PDR.0000156244.84422.55
更新日期:2005-07-01 00:00:00
abstract::We studied the effects of exogenously administered adrenomedullin on fetal pulmonary arterial blood flow in near-term fetal sheep. The hemodynamic effects of a single injection of adrenomedullin into the left pulmonary artery were compared with those of acetylcholine; the effects of repeated injections of adrenomedull...
journal_title:Pediatric research
pub_type: 杂志文章
doi:10.1203/00006450-199704000-00007
更新日期:1997-04-01 00:00:00
abstract::The results of prior studies suggest that abnormalities of development and function of the fetal adrenal occur in pregnancies complicated by intrauterine fetal growth retardation (IUGR). In the present investigation, we sought to extend such studies by matching IUGR infants with normally grown infants of women in whom...
journal_title:Pediatric research
pub_type: 临床试验,杂志文章
doi:10.1203/00006450-199406000-00003
更新日期:1994-06-01 00:00:00
abstract::The copper concentrations in organs of developing Long-Evans Cinnamon (LEC) rats (2 d to 13 mo) were measured to elucidate the pathogenesis of their hereditary hepatitis. Hepatic copper contents of LEC rats were significantly higher than those of control rats (26 to 92 times higher). The subcellular distribution of he...
journal_title:Pediatric research
pub_type: 杂志文章
doi:10.1203/00006450-199203000-00011
更新日期:1992-03-01 00:00:00
abstract::An Epstein-Barr virus-transformed B-cell line derived from a patient with severe combined immunodeficiency who died of a lymphoreticular malignancy has been characterized. The line derived from bone marrow cultures and designated DV-1 shows surface and cytoplasmic IgM and staining with fluorescent monoclonal antibodie...
journal_title:Pediatric research
pub_type: 杂志文章
doi:10.1203/00006450-198704000-00003
更新日期:1987-04-01 00:00:00
abstract::We used in vivo microdialysis to determine the impact of a focal hypoxic-ischemic insult on hippocampal amino acid efflux in the immature brain. Microdialysis probes were inserted into the right hippocampus of postnatal d 7 rats. To induce hypoxic-ischemic injury, the right carotid artery was ligated and animals were ...
journal_title:Pediatric research
pub_type: 杂志文章
doi:10.1203/00006450-199112000-00021
更新日期:1991-12-01 00:00:00
abstract::Lung infections are a common cause of morbidity and mortality in neonates. To evaluate neonatal lung defenses against pneumococci, we challenged rats with aerosols of encapsulated pneumococci in an airborne infection apparatus. Whereas adult rats cleared greater than 95% of inhaled type 1 or type 25 pneumococci within...
journal_title:Pediatric research
pub_type: 杂志文章
doi:10.1203/00006450-198712000-00025
更新日期:1987-12-01 00:00:00
abstract::Birth is characterized by swift and complex transitions in hemodynamic and respiratory variables. Unrecognized pathologies or incidents may quickly become fatal or cause permanent damage. This article introduces an essential component of an acute perinatal care simulator, namely a model for educational simulation of n...
journal_title:Pediatric research
pub_type: 杂志文章
doi:10.1203/PDR.0b013e3181c2def3
更新日期:2010-02-01 00:00:00
abstract:BACKGROUND:Biliary atresia (BA) is an infantile disorder characterized by progressive sclerosing cholangiopathy leading to biliary obstruction. First-line treatment of BA is hepatoportoenterostomy, the prognosis of which is related to age at surgery and to histological variables such as extent of fibrosis and ductular ...
journal_title:Pediatric research
pub_type: 杂志文章
doi:10.1038/pr.2013.177
更新日期:2014-01-01 00:00:00
abstract::Platelet-activating factor (PAF) is a proinflammatory phospholipid mediator implicated in necrotizing enterocolitis. Regulation of PAF-acetylhydrolase (AH), the enzyme degrading PAF, is poorly understood. In this study we found that administration of a dose of PAF (1.5 microg/kg, i.v.), which does not cause gross inte...
journal_title:Pediatric research
pub_type: 杂志文章
doi:10.1203/00006450-199711000-00008
更新日期:1997-11-01 00:00:00
abstract:BACKGROUND:After birth, breastfeeding is the exclusive source of hormonal signaling between mother and infant. Hospitalized infants often receive donor milk when their own mother's milk is unavailable. METHODS:The presence of insulin, leptin, cortisol, progesterone, and testosterone was examined in samples from milk b...
journal_title:Pediatric research
pub_type: 杂志文章
doi:10.1038/s41390-020-0789-6
更新日期:2020-10-01 00:00:00
abstract::Intrauterine ligation of the common bile duct was carried out in ten fetal lambs at approximately 80 days gestational age. Six of the fetal lambs survived until term and were sacrificed at varying periods until the 36th day of life. The lesion which developed resembled a "correctable" type of extrahepatic biliary atre...
journal_title:Pediatric research
pub_type: 杂志文章
doi:10.1203/00006450-198005000-00007
更新日期:1980-05-01 00:00:00
abstract::IL-8/CXC ligand (CXCL) 8 is ingested in high concentrations by the human fetus/neonate with amniotic fluid and human milk, and is also produced constitutively by intestinal epithelial cells (IEC). We have shown that recombinant human IL-8/CXCL8 (rhIL-8/CXCL8) protects cultured IEC against tumor necrosis factor (TNF)-a...
journal_title:Pediatric research
pub_type: 杂志文章
doi:10.1203/01.PDR.0000133196.25949.98
更新日期:2004-08-01 00:00:00
abstract::Chronic disease risk is inextricably linked to our early-life environment, where maternal, fetal, and childhood factors predict disease risk later in life. Currently, maternal obesity is a key predictor of childhood obesity and metabolic complications in adulthood. Although the mechanisms are unclear, new and emerging...
journal_title:Pediatric research
pub_type: 杂志文章,评审
doi:10.1038/pr.2014.169
更新日期:2015-01-01 00:00:00
abstract::Accurate interpretation of the results of GH stimulation tests is of pivotal importance not only in the evaluation of the etiology of growth retardation in children but also in the selection of the best candidates for GH therapy. We performed this study to test a novel immunofunctional GH ( IFGH) assay that makes use ...
journal_title:Pediatric research
pub_type: 评论,杂志文章
doi:10.1203/00006450-200011000-00010
更新日期:2000-11-01 00:00:00
abstract:BACKGROUND:Exposure to inflammation exacerbates injury in neonatal encephalopathy (NE). We hypothesized that brain biomarker mRNA, cytokine mRNA and microRNA differentiate inflammation (E. coli LPS), hypoxia (Hypoxia), and inflammation-sensitized hypoxia (LPS+Hypoxia) in an NE piglet model. METHODS:Sixteen piglets wer...
journal_title:Pediatric research
pub_type: 杂志文章
doi:10.1038/s41390-020-0986-3
更新日期:2020-06-10 00:00:00
abstract::In the fetal rat, nitrofen induces congenital diaphragmatic hernia (CDH) and pulmonary vascular remodeling similar to what is observed in the human condition. Airway hyperactivity is common in infants with CDH and attributed to the ventilator-induced airway damage. The purpose of this study was to test the hypothesis ...
journal_title:Pediatric research
pub_type: 杂志文章
doi:10.1203/01.PDR.0000057986.74037.7B
更新日期:2003-05-01 00:00:00
abstract::Immune and lectin histochemical and microchemical methods were employed to study growth cartilage from seven cases of achondrogenesis type II (Langer-Saldino). The normal architecture of the epiphyseal and growth plate cartilage was replaced by a morphologically heterogeneous tissue. Some areas were comprised of vascu...
journal_title:Pediatric research
pub_type: 杂志文章
doi:10.1203/00006450-198709000-00017
更新日期:1987-09-01 00:00:00
abstract::Inasmuch as taurine biosynthesis is decreased during early postnatal life, an efficient mechanism for taurine uptake by the liver must be present to maintain intracellular stores of this beta-amino acid. Therefore, basolateral liver plasma vesicles prepared from 14-day and adult rats were used to examine taurine trans...
journal_title:Pediatric research
pub_type: 杂志文章
doi:10.1203/00006450-198802000-00009
更新日期:1988-02-01 00:00:00
abstract::Blood mononuclear cells from newborns and from adults, immune or nonimmune to herpes simplex virus, were cultured with IL 2 and herpes simplex virus and the amount of gamma-interferon in the supernatant measured after 3 days. The newborn and nonimmune adult cells made equivalent trace amounts of gamma-interferon in cu...
journal_title:Pediatric research
pub_type: 杂志文章
doi:10.1203/00006450-198605000-00004
更新日期:1986-05-01 00:00:00