Abstract:
:Ventilation of immature airways has been shown to result in pressure-induced deformation and alteration of mechanical properties. These changes in mechanical properties may alter the effect of compressive pressures on pressure-flow relationships. To test this hypothesis, unventilated (Group I, n = 8) and ventilated (group II, n = 8; mean pressures of 8-12 cm H2O for 2 h duration) tracheal segments were excised from preterm lambs approximately 118 days gestation and mounted in a Krebs-filled chamber for determination of compliances and pressure-flow relationships. Compliance data were obtained for both the inflation loop (inflation compliance) and the collapsing loop (collapsing compliance) of the pressure-volume curve for each segment. Flow (V = 2-10 liter/min.) was introduced through the lumen of each segment at different chamber pressures (Pc = 5-30 mm Hg). Driving pressure (Pd) was recorded for each V and Pc. Airway resistance (R) was calculated as Pd/V. Group II had significantly greater (p less than 0.005) radii than Group I, suggesting ventilation-induced deformation. Group II had significantly lower (p less than 0.05) inflation compliance but significantly greater (p less than 0.05) collapsing compliance than group I. Two-factor analysis of variance demonstrated significantly greater (p less than 0.05) R in group II at each value of V and each Pc. These data may help to explain the flow limitation and gas-trapping observed in preterm infants who have been mechanically ventilated.
journal_name
Pediatr Resjournal_title
Pediatric researchauthors
Penn RB,Wolfson MR,Shaffer THdoi
10.1203/00006450-198805000-00017subject
Has Abstractpub_date
1988-05-01 00:00:00pages
519-24issue
5eissn
0031-3998issn
1530-0447journal_volume
23pub_type
杂志文章abstract::Little information is available regarding the time, rhythm, number, and appropriate dosage of human chorionic gonadotropin (HCG) for adequate testing of testicular function in human. The time course of the effect of two, three, or seven HCG injections at intervals of one, five, and two days, respectively, on the plasm...
journal_title:Pediatric research
pub_type: 杂志文章
doi:10.1203/00006450-198006000-00009
更新日期:1980-06-01 00:00:00
abstract::The aim of the present study was to determine the proportion of gamma/delta T-lymphocytes and CD16/CD56 (CD3- and CD3+) cells in the peripheral blood of children and adolescents with Graves' disease (GD; n = 27; mean age, 15.5 +/- 5.1 y) and nontoxic nodular goiter (NTNG; n = 25; mean age, 15.2 +/- 5.7 y), in comparis...
journal_title:Pediatric research
pub_type: 杂志文章
doi:10.1203/01.PDR.0000076663.94850.44
更新日期:2003-09-01 00:00:00
abstract::Alveolar hypoxia increases pulmonary artery pressure in lambs and sheep but increases lung lymph flow only in lambs; the reasons for this are unknown. To test the hypothesis that hypoxia-induced pulmonary venous constriction could in part explain the fluid filtration response in young lambs, eight young lambs (13 +/- ...
journal_title:Pediatric research
pub_type: 杂志文章
doi:10.1203/00006450-198712000-00013
更新日期:1987-12-01 00:00:00
abstract::BackgroundHyperoxic lung injury is characterized by cellular damage from high oxygen concentrations that lead to an inflammatory response and it disrupts normal alveolarization in the developing newborn lung. Adenosine is a signaling molecule that is generated extracellularly by ecto-5'-nucleotidase (CD73) in response...
journal_title:Pediatric research
pub_type: 杂志文章
doi:10.1038/pr.2017.176
更新日期:2017-08-23 00:00:00
abstract:INTRODUCTION:In preterm neonates, peroxides contaminating total parenteral nutrition (TPN) contribute to oxidative stress, which is suspected to be a strong inducer of hepatic complications related to prematurity. Recently, others reported that hexapeptides derived from human milk (HM) exerted free radical-scavenging a...
journal_title:Pediatric research
pub_type: 杂志文章
doi:10.1038/pr.2012.29
更新日期:2012-06-01 00:00:00
abstract::We studied the pre- and postnatal developmental regulation of the hepatic type I IGF receptor in the rat. Fetal rat liver membranes bound IGF-I throughout the latter part of gestation (d 17 to 21). After birth, binding diminished rapidly, reaching barely detectable levels by the 13th postnatal d. However, the presence...
journal_title:Pediatric research
pub_type: 杂志文章
doi:10.1203/00006450-199103000-00002
更新日期:1991-03-01 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::Infants fed soy-based infant formulas are exposed to high levels of genistein, an isoflavone, with potential estrogen-like activity. This study determined whether neonatal exposure of mice to genistein resulted in higher bone mineral density (BMD) and greater resistance to fracture at adulthood. Male and female CD-1 m...
journal_title:Pediatric research
pub_type: 杂志文章
doi:10.1203/01.pdr.0000250200.94611.03
更新日期:2007-01-01 00:00:00
abstract::Apoptosis of CD4+ and CD8+ T cells has been shown in peripheral blood mononuclear cells (PBMCs) from HIV-infected adults analyzed after overnight culture. Because cell death may be an artifact of in vitro culture, and because there is little information on apoptosis in pediatric HIV disease, we undertook a cross-secti...
journal_title:Pediatric research
pub_type: 临床试验,杂志文章,随机对照试验
doi:10.1203/00006450-199711000-00018
更新日期:1997-11-01 00:00:00
abstract::Cerebral malaria is the most severe neurological complication of infection with Plasmodium falciparum. With >575,000 cases annually, children in sub-Saharan Africa are the most affected. Surviving patients have an increased risk of neurological and cognitive deficits, behavioral difficulties, and epilepsy making cereb...
journal_title:Pediatric research
pub_type: 杂志文章,评审
doi:10.1203/PDR.0b013e3181eee738
更新日期:2010-10-01 00:00:00
abstract::Although cisapride is widely used to treat gastrointestinal motility disorders, it has been associated with QT prolongation, torsades de pointes, and cardiac arrest. Only in children, however, has atrioventricular (AV) block after cisapride been reported. This study used Langendorff perfusion to determine the direct e...
journal_title:Pediatric research
pub_type: 杂志文章
doi:10.1203/01.PDR.0000050122.67091.1D
更新日期:2003-03-01 00:00:00
abstract::Spleens from 1-20-wk-old guinea pigs infected in utero with Treponema pallidum and age-matched controls, born to normal and heat-killed (56 degrees C, 2 h.) T. pallidum-injected mothers, were examined for their in vitro lymphoproliferative response to phytohemagglutinin, concanavalin A, and lipopolysaccharide. Additio...
journal_title:Pediatric research
pub_type: 杂志文章
doi:10.1203/00006450-199712000-00013
更新日期:1997-12-01 00:00:00
abstract::Intestinal absorption and its relationship to increased total body water was studied in seven infants with congenital heart disease receiving regular diuretics due to congestive heart failure. All infants and six age-matched healthy controls were studied for a 3-d period during which time all food intake was recorded,...
journal_title:Pediatric research
pub_type: 临床试验,杂志文章
doi:10.1203/00006450-199410000-00023
更新日期:1994-10-01 00:00:00
abstract:BACKGROUND:Current tools to predict the severity of respiratory syncytial virus (RSV) infection might be improved by including immunological parameters. We hypothesized that a combination of inflammatory markers would differentiate between severe and mild disease in RSV-infected children. METHODS:Blood and nasopharyng...
journal_title:Pediatric research
pub_type: 杂志文章
doi:10.1038/pr.2012.163
更新日期:2013-02-01 00:00:00
abstract::Newborn Sprague-Dawley rat pups were found to have reduced net tubular reclamation of the beta-amino acid taurine in vivo. The reabsorption of this compound increased between the 2nd and 4th week of life and the excreted taurine fell despite a rise in glomerular filtration rate indicative of increased transport with m...
journal_title:Pediatric research
pub_type: 杂志文章
doi:10.1203/00006450-197907000-00012
更新日期:1979-07-01 00:00:00
abstract::A 2-month-old white girl had severe liver disease (but without signs of hepatic necrosis, infection or cirrhosis), urinary cytomegalovirus, transient reduction of alpha 1-antitrypsin concentration and transient abnormal alpha 1-antitrypsin phenotype that were not present in her parents. Five serum specimens that were ...
journal_title:Pediatric research
pub_type: 杂志文章
doi:10.1203/00006450-198203000-00006
更新日期:1982-03-01 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:A growing body of evidence defines inflammation as a hallmark feature of disease pathogenesis of Duchenne muscular dystrophy. To tailor potential immune modulatory interventions, a better understanding of immune dysregulation in Duchenne muscular dystrophy is needed. We now asked whether dystrophin deficienc...
journal_title:Pediatric research
pub_type: 杂志文章
doi:10.1038/s41390-019-0427-3
更新日期:2019-08-01 00:00:00
abstract::This study tested the hypothesis that the sexually dimorphic adrenocortical response to stress is already established before birth. Chronically instrumented late gestation pregnant sheep carrying 16 male and 15 female age-matched singleton fetuses were subjected to an acute episode of hypoxic stress. Maternal and feta...
journal_title:Pediatric research
pub_type: 杂志文章
doi:10.1203/PDR.0b013e3182042a20
更新日期:2011-02-01 00:00:00
abstract::The classical model of gene regulation by hormones involves a hormone-bound receptor interacting with a DNA response element to increase or decrease gene transcription. Steroid hormone regulation more commonly involves atypical cis-elements, co-receptors, accessory proteins, and unique modes of interaction on differen...
journal_title:Pediatric research
pub_type: 杂志文章
doi:10.1203/00006450-200111000-00007
更新日期:2001-11-01 00:00:00
abstract::There has been recent interest in the use of the phosphodiesterase-5 inhibitor sildenafil for treating pulmonary hypertension. We examined the interaction between inhaled nitric oxide (iNO) and i.v. sildenafil in 12 piglets with acute pulmonary hypertension and lung injury secondary to meconium aspiration. Six animals...
journal_title:Pediatric research
pub_type: 杂志文章
doi:10.1203/01.PDR.0000112033.81970.C2
更新日期:2004-03-01 00:00:00
abstract::The effect of alpha-adrenergic blockade by phentolamine on the pulmonary vascular response to dopamine was studied in chronically prepared newborn lambs. Dopamine was administered at doses of 2.7 micrograms . kg-1 . min-1, 27 micrograms . kg-1 . min-1 and 270 micrograms . kg-1 . min-1 with and without alpha-adrenergic...
journal_title:Pediatric research
pub_type: 杂志文章
doi:10.1203/00006450-198306000-00007
更新日期:1983-06-01 00:00:00
abstract:BACKGROUND:Short-bowel syndrome (SBS) is the most common cause of neonatal intestinal failure. Recovery requires intestinal adaptation, dependent on enteral nutrition (EN) and growth factors such as glucagon-like peptide-2 (GLP-2), which is secreted from L cells in the ileum. Neonatal SBS often results in loss of ileum...
journal_title:Pediatric research
pub_type: 杂志文章
doi:10.1038/pr.2013.44
更新日期:2013-06-01 00:00:00
abstract::A new model has been developed for the study of maternal phenylketonuria. Beginning on the 12th day of gestation the diet of pregnant rats was supplemented with 0.5% alpha-methylphenylalanine and 3% phenylalanine. This resulted in an 83% reduction of hepatic phenylalanine hydroxylase activity. The maternal plasma phen...
journal_title:Pediatric research
pub_type: 杂志文章
doi:10.1203/00006450-198205000-00014
更新日期:1982-05-01 00:00:00
abstract::The age-related changes in fasting arterial levels of energy substrates and insulin were studied at birth and/or 6 wk in eleven baboon infants. In addition, the renal contribution to glucose release in the primate infant was estimated. Arterial blood glucose levels were similar in six fasted newborns and in nine faste...
journal_title:Pediatric research
pub_type: 杂志文章
doi:10.1203/00006450-198008000-00006
更新日期:1980-08-01 00:00:00
abstract::The previous biochemical evidence had suggested that glutaric aciduria type II (GA II) is due to deficient dehydrogenation of multiple short-chain acyl coenzyme A's (CoA's), bu the precise biochemical mechanism underlying this disease was unknown. We investigated substrate oxidation and in vitro activities of isovaler...
journal_title:Pediatric research
pub_type: 杂志文章
doi:10.1203/00006450-198012000-00013
更新日期:1980-12-01 00:00:00
abstract:BACKGROUND:Congenital portosystemic shunt (CPSS) has the potential to cause hepatic encephalopathy and thus needs long-term follow-up, but an effective follow-up method has not yet been established. We aimed to evaluate the importance of per-rectal portal scintigraphy (PRPS) for long-term follow-up of CPSS. METHODS:We...
journal_title:Pediatric research
pub_type: 杂志文章
doi:10.1038/pr.2014.11
更新日期:2014-05-01 00:00:00
abstract::Hypoxia and other adverse conditions are commonly encountered by rapidly growing cells. The RNA-binding protein RBM3 (RNA-binding motif protein 3), which is transcriptionally induced by low temperature and hypoxia, has recently been implicated in survival of colon cancer cells by mechanisms involving cyclooxygenase-2 ...
journal_title:Pediatric research
pub_type: 杂志文章
doi:10.1203/PDR.0b013e3181c13326
更新日期:2010-01-01 00:00:00
abstract:BACKGROUND:We examined the extent of fetal lung hypoplasia and lung maturation using the amniotic lamellar body count (LBC) in congenital diaphragmatic hernia (CDH). METHODS:We obtained 30 amniotic fluid samples from human CDH cases during cesarean section. We assessed LBC, magnetic resonance imaging (MRI), and ultras...
journal_title:Pediatric research
pub_type: 杂志文章
doi:10.1038/pr.2012.187
更新日期:2013-03-01 00:00:00
abstract::BackgroundSotos syndrome (SoS) is an overgrowth disorder with various congenital anomalies and is usually accompanied by other clinical problems. However, anorectal malformations have not been documented as part of the SoS entity. Our objective is to report on a case of SoS associated with Hirschsprung's disease (HSCR...
journal_title:Pediatric research
pub_type: 杂志文章
doi:10.1038/pr.2017.106
更新日期:2017-07-01 00:00:00