Abstract:
:In blood vessels with diameters less than 500 microns, both the hematocrit and viscosity decrease with decreasing tube diameter [Fåhraeus effect (FE) and Fåhraeus-Lindqvist effect (FLE)]. Because both effects may be influenced by red blood cell (RBC) volume and osmolality, the effects of RBC type and suspending medium osmolality (216, 294, and 473 mosmol/kg) on tube hematocrit (HT) and relative viscosity (eta r) in narrow tubes (32 to 145 microns diameter) were studied for 0.40 L/L (40%) hematocrit suspensions of human neonatal and adult RBC in buffer. Osmolality of 473 mosmol/kg caused shrinkage of RBC by 20% so that neonatal RBC assume the volume of adult RBC in isotonic buffer. The FLE and FE were present for both neonatal and adult RBC suspensions regardless of osmolality. The viscosity reduction when going from a 145- to a 32-microns tube was greatest for the hypertonic neonatal and adult RBC: changes were -44% (473 mosmol/kg) and -31% (294 mosmol/kg) for neonatal RBC, and -39% (473 mosmol/kg), -34% (294 mosmol/kg), and -21% (216 mosmol/kg) for adult RBC. The eta r were significantly lower (7% on average) for isotonic neonatal RBC compared with adult cells in 32-microns (p < 0.025), 46-microns, and 146-microns tubes (p < 0.001). In contrast, HT and thus the FE were less affected by RBC type or osmolality (only 13% change over entire range of osmolality and diameter): relative HT values were systematically lower (p < 0.02), and the FE greater, for isotonic neonatal versus adult RBC.(ABSTRACT TRUNCATED AT 250 WORDS)
journal_name
Pediatr Resjournal_title
Pediatric researchauthors
McKay CB,Linderkamp O,Meiselman HJdoi
10.1203/00006450-199310000-00031subject
Has Abstractpub_date
1993-10-01 00:00:00pages
538-43issue
4eissn
0031-3998issn
1530-0447journal_volume
34pub_type
杂志文章abstract::To evaluate the response of the small intestinal mucosa to Saccharomyces boulardii (S.b.), a yeast widely used in some countries as an adjuvant drug with oral antimicrobial therapy, seven healthy adult volunteers were treated with high doses of lyophilized S.b. (250 mg four times per day) for 2 wk. A peroral jejunal s...
journal_title:Pediatric research
pub_type: 杂志文章
doi:10.1203/00006450-198602000-00020
更新日期:1986-02-01 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::Previous studies have demonstrated metabolic dysfunction in the mononuclear cells of some children with abnormal cell-mediated immunity. Interpretation of these observations has been complicated by the extreme heterogeneity of cell types examined. The glycolytic metabolism of relatively enriched T-cells, non-T mononuc...
journal_title:Pediatric research
pub_type: 杂志文章
doi:10.1203/00006450-198002000-00005
更新日期:1980-02-01 00:00:00
abstract::To date, many mutations, including intronic nucleotide changes, in the SLC12A3 gene encoding the thiazide-sensitive sodium-chloride cotransporter (NCCT) have been reported in Gitelman's syndrome (GS) patients. However, it has not been clarified whether intronic nucleotide changes affect mRNA content. Since mRNA analys...
journal_title:Pediatric research
pub_type: 杂志文章
doi:10.1203/pdr.0b013e318031935a
更新日期:2007-04-01 00:00:00
abstract::Plasma amino acid levels in newborn babies are often measured as part of a screening for inherited metabolic disease, or less commonly as part of a nutritional assessment. We have examined certain factors which affect the levels as measured in low birth weight babies during the first 3 wk of life. As in other studies,...
journal_title:Pediatric research
pub_type: 杂志文章
doi:10.1203/00006450-198505000-00008
更新日期:1985-05-01 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:Therapeutic hypothermia (TH) has become standard treatment for severe and moderate hypoxic-ischemic neonatal encephalopathy (HIE). Our group has developed an optically based, noninvasive concept of assessing the capacity for oxygen delivery from the microcirculation to the cells of a tissue under investigati...
journal_title:Pediatric research
pub_type: 杂志文章
doi:10.1038/pr.2016.16
更新日期:2016-06-01 00:00:00
abstract:BACKGROUND:Gender is increasingly recognized as an important influence on brain development, disease susceptibility, and response to pharmacologic/rehabilitative treatments. In regenerative medicine, it remains entirely unknown whether there is an interaction between transplanted stem cells and host gender that might b...
journal_title:Pediatric research
pub_type: 杂志文章
doi:10.1038/pr.2014.7
更新日期:2014-05-01 00:00:00
abstract:BACKGROUND:Physical activity (PA) is essential for children throughout their growth and maturation. It improves physiological and psychological health and limits the risk of developing metabolic disorders. However, some chronic physiological and metabolic diseases may lead to decreased PA. The diversity of outcomes in ...
journal_title:Pediatric research
pub_type: 杂志文章,meta分析
doi:10.1038/s41390-019-0409-5
更新日期:2019-08-01 00:00:00
abstract:BACKGROUND:Animal models have shown that insulin-like growth factor I (IGF-I) may mediate protein-induced kidney growth. Our aim was to analyze the effect of IGF-I on protein-induced kidney growth in healthy infants. METHODS:This is a secondary analysis of a randomized trial that compared growth of infants fed with a ...
journal_title:Pediatric research
pub_type: 杂志文章,随机对照试验
doi:10.1038/pr.2013.87
更新日期:2013-08-01 00:00:00
abstract:BACKGROUND:Although cardiopulmonary bypass (CPB) has been previously studied as risking infection and inflammatory responses, few studies evaluate the relationship of preoperative high total immunoglobulin E (tIgE) to outcomes in pediatric patients predisposed to atopy undergoing cardiac surgery with CPB. METHODS:Seru...
journal_title:Pediatric research
pub_type: 杂志文章
doi:10.1038/s41390-018-0048-2
更新日期:2018-11-01 00:00:00
abstract::Supine sleeping, recommended to prevent sudden infant death, should be started in the delivery hospital, but meets concern that neonates may exhibit more intermittent hypoxia in this position. We aimed to demonstrate that intermittent hypoxia is equally rare in supine and side position. We enrolled 609 term neonates i...
journal_title:Pediatric research
pub_type: 杂志文章,随机对照试验
doi:10.1203/PDR.0b013e31819e76b1
更新日期:2009-06-01 00:00:00
abstract::This prospective randomized pilot study aimed to test the hypotheses that partial liquid ventilation combined with a high positive end-expiratory pressure (PEEP) and a moderate tidal volume results in improved gas exchange and lung mechanics without negative hemodynamic influences compared with conventional mechanical...
journal_title:Pediatric research
pub_type: 杂志文章
doi:10.1203/00006450-200208000-00015
更新日期:2002-08-01 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::We studied the hemodynamic responses of 29 anesthetized and mechanically ventilated piglets to acute hypoxia [reduction of Pao2 from 130 to 38 mm Hg induced by inhalation of 7% fraction of inspired oxygen (Fio2) for 7.5 min] before and during group B beta-hemolytic streptococci (GBS) sepsis. During hypoxia, nonseptic ...
journal_title:Pediatric research
pub_type: 杂志文章
doi:10.1203/00006450-200004000-00017
更新日期:2000-04-01 00:00:00
abstract::Placental steroid sulfatase deficiency is a genetic disorder only recently reported in the medical literature. Most documented cases of placental sulfatase deficiency have been marked by delay in onset of labor, lack of cervical dilatation, and relative refractoriness of oxytocic agents and amniotomy. We have studied ...
journal_title:Pediatric research
pub_type: 杂志文章
doi:10.1203/00006450-197708000-00008
更新日期:1977-08-01 00:00:00
abstract::The flavin-containing monooxygenases (FMOs) are important for the metabolism of numerous therapeutics and toxicants. Six mammalian FMO genes (FMO1-6) have been identified, each exhibiting developmental and tissue- and species-specific expression patterns. Previous studies demonstrated that human hepatic FMO1 is restri...
journal_title:Pediatric research
pub_type: 杂志文章
doi:10.1203/00006450-200202000-00018
更新日期:2002-02-01 00:00:00
abstract::Preterm infants are exposed to frequent painful procedures and agitating stimuli over the many weeks of their hospitalization in the neonatal intensive care unit (NICU). The adverse neurobiological impact of pain and stress in the preterm infant has been well documented, including neuroimaging and neurobehavioral outc...
journal_title:Pediatric research
pub_type: 杂志文章,评审
doi:10.1038/s41390-019-0744-6
更新日期:2020-08-01 00:00:00
abstract:BACKGROUND:To evaluate the apoptosis inhibitor of macrophage (AIM) deposition patterns on the kidneys of children with IgA nephropathy (IgAN) and Henoch-Schönlein purpura nephritis (HSPN) and to investigate the clinical usefulness of serum and/or urinary AIM levels as biomarkers for the disease activity. METHODS:Immun...
journal_title:Pediatric research
pub_type: 杂志文章
doi:10.1038/s41390-020-0951-1
更新日期:2020-05-14 00:00:00
abstract::Defective arousal mechanisms are viewed as contributory to sleep hypopnea disorders and sudden infant death syndrome. Sighs (i.e. augmented breaths) as well as startles have not traditionally been viewed as arousal-related phenomena in infants. We hypothesized that, if sighs and startles are the initial event in a seq...
journal_title:Pediatric research
pub_type: 杂志文章
doi:10.1203/00006450-199811000-00021
更新日期:1998-11-01 00:00:00
abstract:BACKGROUND:Intrauterine inflammation adversely affects cardiopulmonary, systemic, and cerebral hemodynamics in preterm neonates, but its impact on responses to endotracheal tube (ETT) suction, known to affect hemodynamics, is unknown. We hypothesized that intrauterine inflammation would alter the cardiopulmonary and ce...
journal_title:Pediatric research
pub_type: 杂志文章
doi:10.1038/pr.2013.70
更新日期:2013-07-01 00:00:00
abstract::BackgroundThe mechanisms underlying aberrant activation of intestinal Toll-like receptor 4 (TLR4) signaling in necrotizing enterocolitis (NEC) remain unclear. In this study, we examined the role of single-immunoglobulin interleukin-1 receptor-related molecule (SIGIRR), an inhibitor of TLR signaling, in modulating expe...
journal_title:Pediatric research
pub_type: 杂志文章
doi:10.1038/pr.2017.211
更新日期:2018-01-01 00:00:00
abstract::Congenital Central Hypoventilation Syndrome (CCHS) patients show partial retention of peripheral chemoreception despite impaired ventilatory responses to CO2 and hypoxia. The condition allows examination of central responses to hyperoxia, which minimizes afferent traffic from peripheral chemoreceptors. We used functio...
journal_title:Pediatric research
pub_type: 杂志文章
doi:10.1203/01.PDR.0000155763.93819.46
更新日期:2005-04-01 00:00:00
abstract:BACKGROUND:The prevalence of autism spectrum disorders (ASD) is 5-fold higher in preterm (PT) infants born ≤28 weeks gestational age (GA) as compared to the general population. The relationship between placental pathologic lesions and ASD in PT infants has not been studied. OBJECTIVES:The objective of this study was t...
journal_title:Pediatric research
pub_type: 杂志文章
doi:10.1038/s41390-020-01160-4
更新日期:2020-09-19 00:00:00
abstract::Fetal dermal wounds heal scarlessly and with a minimal inflammatory response. When a robust inflammatory response is induced at the site of fetal dermal wounds by the application of cytokines, healing results in fibrosis. To test the hypothesis that the reduced inflammatory response in fetal wounds is due to impaired ...
journal_title:Pediatric research
pub_type: 杂志文章
doi:10.1203/01.pdr.0000184326.01884.bc
更新日期:2005-12-01 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
abstract::In a patient with extrapyramidal movement disorder and extremely low creatinine concentrations in serum and urine, in vivo proton magnetic resonance spectroscopy disclosed a generalized depletion of creatinine in the brain. Oral substitution of arginine, a substrate for creatine synthesis, resulted in an increase of b...
journal_title:Pediatric research
pub_type: 杂志文章
doi:10.1203/00006450-199409000-00023
更新日期:1994-09-01 00:00:00
abstract::Endothelin (ET)-1 is a potent vasoconstrictor peptide that modulates basal pulmonary vascular resistance (PVR) in the normal ovine fetus and contributes to high PVR after chronic intrauterine pulmonary hypertension. Although high PVR is present in premature lambs with severe hyaline membrane disease (HMD), whether ET-...
journal_title:Pediatric research
pub_type: 杂志文章
doi:10.1203/00006450-199808000-00006
更新日期:1998-08-01 00:00:00
abstract:INTRODUCTION:Current advances in neonatology have improved survival among preterm and low-birth-weight infants. However, the risk of neonatal death in preterm infants is much greater than in full-term neonates and is frequently associated with infections. METHODS:Little is known about the immune status of preterm neon...
journal_title:Pediatric research
pub_type: 杂志文章
doi:10.1038/pr.2012.6
更新日期:2012-05-01 00:00:00
abstract::In spontaneously breathing newborn lambs, alveolar hypoxia increases lung microvascular pressure, which causes lung lymph flow to increase and the concentration of protein in lymph to decrease. To see if this response derives from hypoxia itself rather than from the change in breathing pattern that occurs during hypox...
journal_title:Pediatric research
pub_type: 杂志文章
doi:10.1203/00006450-198405000-00009
更新日期:1984-05-01 00:00:00