Abstract:
:We evaluated the hypothesis that increased endogenous opioid activity mediates part or all of the left ventricular contractile and pump dysfunction previously demonstrated in HCl-induced metabolic acidemia. Eighteen Western newborn lambs were catheterized and instrumented; pacing wires were sutured to the right atrial appendage; a catheter mounted micromanometer pressure transducer was inserted into the left ventricle; and a 2.5 F thermistor was inserted into the distal abdominal aorta. The lambs were studied 3 days after surgery. Metabolic acidemia was produced with an infusion of 0.5 N HCl into the inferior vena cava. Inhibition of endogenous opioids was achieved with a bolus of 2 mg/kg of intravenous naloxone, which was demonstrated to inhibit morphine sulfate-induced myocardial dysfunction. The effects of opioid inhibition were contrasted with our previously published results after restoration of a normal arterial pH with intravenous sodium bicarbonate. In agreement with our previous study, we found that reducing the arterial pH from 7.41 +/- 0.01 to 6.97 +/- 0.04 was associated with a 45% reduction in cardiac output which resulted from a 50% reduction in stroke volume. These changes in turn were mediated by a 35% reduction in the maximal first derivative of left ventricular pressure and/or a 63% increase in systemic vascular resistance which we used to estimate contractility and afterload, respectively. Left ventricular end diastolic pressure increased during acidemia. Although opioid inhibition produced a consistent increase in the maximal first derivative of left ventricular pressure, this increase was relatively small and was not associated with a significant change in cardiac output, stroke volume, or systemic vascular resistance.
journal_name
Pediatr Resjournal_title
Pediatric researchauthors
Fisher DJ,Dreyer WJ,Tate C,Michael L,Smith EO,Entman Mdoi
10.1203/00006450-198806000-00023subject
Has Abstractpub_date
1988-06-01 00:00:00pages
643-6issue
6eissn
0031-3998issn
1530-0447journal_volume
23pub_type
杂志文章abstract::Oxidant stress has been implicated as playing a role in the pathogenesis of cholestatic liver injury. The objective of this study was to determine whether the xanthine oxidase/xanthine dehydrogenase enzyme system was involved in this oxidant stress. Adult Sprague-Dawley rats were treated with the xanthine oxidase inhi...
journal_title:Pediatric research
pub_type: 杂志文章
doi:10.1203/00006450-199809000-00022
更新日期:1998-09-01 00:00:00
abstract::The IQ's of Jamaican boys aged 6-10 were associated significantly with the presence or absence of severe malnutrition in infancy, with height at time of IQ testing, and with a measure of the boys' social background. A multiple correlation coefficient of 0.674 was obtained between IQ and the three factors. Social backg...
journal_title:Pediatric research
pub_type: 杂志文章
doi:10.1203/00006450-197601000-00011
更新日期:1976-01-01 00:00:00
abstract::Increased fetal lung expansion profoundly inhibits surfactant protein gene expression and stimulates cellular proliferation in the fetal lung. Our aim was to determine whether increased expansion of the lung after birth, by the application of a continuous positive airway pressure (CPAP) for 12 h, inhibits surfactant p...
journal_title:Pediatric research
pub_type: 杂志文章
doi:10.1203/00006450-200112000-00015
更新日期:2001-12-01 00:00:00
abstract::Hypoxic-ischemic (HI) injury in the preterm neonate incurs numerous functional deficits, however little is known about the neurochemically-defined brain nuclei that may underpin them. Key candidates are the brainstem catecholamine neurons. Using an immature animal model, the postnatal day (P)-3 (P3) rat pup, we invest...
journal_title:Pediatric research
pub_type: 杂志文章
doi:10.1203/PDR.0b013e3181659774
更新日期:2008-04-01 00:00:00
abstract::Phototherapy results in the conversion of bilirubin to more water-soluble isomers. Six clinically used phototherapy lamps which differ in their emission spectra have been compared in their ability to produce configurational and structural isomers of bilirubin in vitro. For all of the lamps, the initial rate of configu...
journal_title:Pediatric research
pub_type: 杂志文章
doi:10.1203/00006450-198407000-00021
更新日期:1984-07-01 00:00:00
abstract::Conversion of adenosine to inosine is decreased in adenosine deaminase (ADA)-deficient fibroblasts at all concentrations of adenosine tested. Adenosine is not differentially toxic to ADA-deficient fibroblasts except at very high (5 X 10(-4) -1 X 10(-3) M) adenosine levels. Conversion of [14C] adenosine to GTP is not d...
journal_title:Pediatric research
pub_type: 杂志文章
doi:10.1203/00006450-197607000-00002
更新日期:1976-07-01 00:00:00
abstract::The placenta is essential to nutrition before birth. Recent work has shown that a range of clearly defined alterations can be found in the placentas of infants with intrauterine growth restriction (IUGR). In the mouse, a placental specific knockout of a single imprinted gene, encoding IGF-2, results in one pattern of ...
journal_title:Pediatric research
pub_type: 杂志文章,评审
doi:10.1203/01.PDR.0000181381.82856.23
更新日期:2005-11-01 00:00:00
abstract::Neonatal PMN (polymorphonuclear neutrophils) exhibit altered inflammatory responsiveness and greater longevity compared with adult PMN; however, the involved mechanisms are incompletely defined. Receptors containing immunoreceptor tyrosine-based inhibitory motif (ITIM) domains promote apoptosis by activating inhibitor...
journal_title:Pediatric research
pub_type: 杂志文章
doi:10.1203/PDR.0b013e3181b1bc19
更新日期:2009-09-01 00:00:00
abstract::Atherosclerosis originates in childhood and adolescence. The goal of this review is to highlight how exercise and physical activity during childhood and adolescence, critical periods of growth and development, can prevent adult cardiovascular disease (CVD), particularly through molecular mechanisms of monocytes, a key...
journal_title:Pediatric research
pub_type: 杂志文章,评审
doi:10.1038/s41390-019-0581-7
更新日期:2020-01-01 00:00:00
abstract::Gaucher disease, the most common of the sphingolipidoses, results from the inherited deficiency of the enzyme glucocerebrosidase (EC 3.2.1.45). Although type 2 (acute neuronopathic) Gaucher disease is associated with rapidly progressive and fatal neurologic deterioration, the pathophysiologic mechanisms leading to the...
journal_title:Pediatric research
pub_type: 杂志文章
doi:10.1203/00006450-200008000-00018
更新日期:2000-08-01 00:00:00
abstract::To investigate the role of nutrition in the regulation of IGFs during the perinatal period, 10-d-old rats were infused intravenously with various concentrations of nutrients for 24 h. Breast-fed litter mates served as controls. The effect of caloric intake on concentrations of IGF-I and IGF-II as well as IGF-binding p...
journal_title:Pediatric research
pub_type: 杂志文章
doi:10.1203/00006450-198908000-00012
更新日期:1989-08-01 00:00:00
abstract::An animal study to evaluate dual-energy x-ray absorptiometry (DXA) and magnetic resonance (MR) imaging and spectroscopy for measurement of neonatal body composition was performed. Twenty-three piglets with body weights ranging from 848 to 7550 g were used. After measuring total body water, animals were killed and body...
journal_title:Pediatric research
pub_type: 杂志文章
doi:10.1203/00006450-199910000-00018
更新日期:1999-10-01 00:00:00
abstract::After the infusion of fructose, 0.25 g/kg body wt, the mean peak plasma uric acid level was 5.4 +/- 0.7 (SEM) mg/100 ml in six normal children and was not significantly increased compared with that of the mean basal value of 4.1 +/- 0.5 mg/100 ml. The mean blood inorganic phosphate (Pi) levels were significantly less ...
journal_title:Pediatric research
pub_type: 杂志文章
doi:10.1203/00006450-197510000-00005
更新日期:1975-10-01 00:00:00
abstract:INTRODUCTION:Corticosteroids have been widely used in clinical medicine as a first-line therapy to modify the inflammatory response in many pulmonary and systemic diseases. Inhaled and intratracheally administered corticosteroids have a particular interest in that their use allows the clinician to circumvent systemic s...
journal_title:Pediatric research
pub_type: 杂志文章
doi:10.1038/pr.2011.78
更新日期:2012-04-01 00:00:00
abstract::Chronically catheterized fetal lambs (n = 11, gestational age 111-139 days) and neonatal lambs (n = 20, postnatal age 4-30 days) were studied to explore during development the relationship of renal hemodynamic responses during hypoxemia to plasma epinephrine concentration (E), plasma norepinephrine concentration (NE),...
journal_title:Pediatric research
pub_type: 杂志文章
doi:10.1203/00006450-198802000-00004
更新日期:1988-02-01 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::Obese children have a great risk of hypertension and cardiovascular morbidity in adults. The insulin-like growth factor type II (IGF-II) regulates glucose homeostasis, cardiovascular functions, and lipid metabolism. IGF2 gene variants have shown a strong association with weight, body mass index (BMI), and metabolic pr...
journal_title:Pediatric research
pub_type: 杂志文章
doi:10.1203/PDR.0b013e3181d22757
更新日期:2010-04-01 00:00:00
abstract:BACKGROUND:Therapeutic hypothermia (HT) is the only intervention that improves outcomes in neonatal hypoxic-ischemic encephalopathy (HIE). However, the multifactorial mechanisms by which HT impacts HIE are incompletely understood. The complement system plays a major role in the pathogenesis of ischemia-reperfusion inju...
journal_title:Pediatric research
pub_type: 杂志文章
doi:10.1038/pr.2016.271
更新日期:2017-04-01 00:00:00
abstract::The aim of this study was to compare catecholamine concentrations in the fetal umbilical artery cord blood from the offspring of smokers versus the offspring of nonsmokers. Pregnant women who were self-identified as smokers (>/=10 cigarettes per day throughout pregnancy) or nonsmokers were recruited for study particip...
journal_title:Pediatric research
pub_type: 杂志文章
doi:10.1203/00006450-200301000-00020
更新日期:2003-01-01 00:00:00
abstract::This study was designed to evaluate upper airway protective mechanisms in response to pharyngeal fluid stimulation in healthy term and preterm infants at term equivalent age. Five term and seven preterm infants were studied and the following recorded: sleep state, cardiorespiratory function, and swallowing. Infusions ...
journal_title:Pediatric research
pub_type: 杂志文章
doi:10.1203/00006450-199811000-00011
更新日期:1998-11-01 00:00:00
abstract::Local delivery of Escherichia coli beta-galactosidase gene (beta-gal) to surfactant protein-A (SP-A)-producing cells by a replication-defective recombinant adenovirus (AdCMV.beta-gal) was tested in human 8-12-wk-old fetal lung explants cultured in Waymouth's medium. In contrast to uninfected explants, direct addition ...
journal_title:Pediatric research
pub_type: 杂志文章
doi:10.1203/00006450-199607000-00024
更新日期:1996-07-01 00:00:00
abstract::The isobutyryl-CoA dehydrogenase (IBD) enzyme is involved in the degradation of valine. IBD deficiency was first reported in 1998 and subsequent genetic investigations identified acyl-CoA dehydrogenase (ACAD) 8, now IBD, as the gene responsible for IBD deficiency. Only three individuals homozygous or compound heterozy...
journal_title:Pediatric research
pub_type: 杂志文章
doi:10.1203/01.pdr.0000233085.72522.04
更新日期:2006-09-01 00:00:00
abstract::The effects of ascorbic acid on the excretion of homogentisic acid and its derivative benzoquinone acetic acid were studied in two adults and three infants. The administration of relatively large amounts of ascorbic acid to the adults was followed by a disappearance of benzoquinone acetic acid from the urine, whereas ...
journal_title:Pediatric research
pub_type: 杂志文章
doi:10.1203/00006450-198908000-00015
更新日期:1989-08-01 00:00:00
abstract::An imbalance in apoptosis or survival of immune cells plays an essential role in the pathophysiology of sepsis. Phagocytosis-induced cell death (PICD) is a common result of the pathogen-host cell interaction mediated by reactive oxygen species (ROS). Neonatal sepsis is frequently characterized by hyperinflammation. Co...
journal_title:Pediatric research
pub_type: 杂志文章
doi:10.1203/PDR.0b013e31815b8e9f
更新日期:2008-01-01 00:00:00
abstract:BACKGROUND:Using a large population-based sample, this study aims to verify whether televiewing at 29 mo, a common early childhood pastime, is prospectively associated with school readiness at 65 mo. METHODS:Participants are a prospective longitudinal cohort of 991 girls and 1,006 boys from the Quebec Longitudinal Stu...
journal_title:Pediatric research
pub_type: 杂志文章
doi:10.1038/pr.2013.105
更新日期:2013-09-01 00:00:00
abstract::We have evaluated the effect of galanin (Gal), a newly identified hypothalamic peptide, on growth hormone (GH) secretion in 10 children with normal stature (NS), nine with constitutional growth delay (CGD), and five with isolated GH deficiency (IGHD). Gal was infused intravenously at a rate of 8 or 15 micrograms/kg/h....
journal_title:Pediatric research
pub_type: 杂志文章
doi:10.1203/00006450-198910000-00006
更新日期:1989-10-01 00:00:00
abstract::It is increasingly recognized that the abnormal physiologic consequences of pulmonary hypertension (PH) may contribute to poor cardiopulmonary health in premature babies. Conflicting literature has led to clinical uncertainty, pathological misinterpretation, and variability in treatment approaches among practitioners....
journal_title:Pediatric research
pub_type: 杂志文章,评审
doi:10.1038/pr.2017.200
更新日期:2017-12-01 00:00:00
abstract::Seven essentially healthy term infants who received gentamicin starting on the 1st day of life for prolonged rupture of membranes and maternal fever were compared with nine healthy term infants to determine whether this drug induces alterations in the auditory pathway. The auditory pathway was studied on the 3rd day o...
journal_title:Pediatric research
pub_type: 杂志文章
doi:10.1203/00006450-199009000-00017
更新日期:1990-09-01 00:00:00
abstract::Heart rate turbulence (HRT) is a chronotropic response of the sinus heart rhythm to ventricular premature beat (VPB). Children show decreasing heart rate together with the maturation of the autonomic nervous system. The aim of the research was to assess the relationship between HRT parameters, age, and heart rate and ...
journal_title:Pediatric research
pub_type: 杂志文章
doi:10.1203/PDR.0b013e3181598836
更新日期:2007-12-01 00:00:00
abstract:BACKGROUND:A lack of consensus exists as to the timing of kidney biopsy in children with steroid-dependent nephrotic syndrome (SDNS) where minimal change disease (MCD) predominates. This study aimed at examining the applicability of a biomarker-assisted risk score model to select SDNS patients at high risk of focal seg...
journal_title:Pediatric research
pub_type: 杂志文章
doi:10.1038/s41390-019-0277-z
更新日期:2019-03-01 00:00:00