Abstract:
:We used an in vitro model system to examine the sites of deposition of aqueous therapeutic aerosols administered through 3-mm, 6-mm, and 9-mm endotracheal tubes (commonly used in infants, children, and adults) at clinically relevant inspiratory flow rates. Aerosol was delivered to the endotracheal tube via a "T" piece and a 90 degree elbow. Aerosol exiting the endotracheal tube passed through an appropriately sized Plexiglas model of the trachea and mainstem bronchi, and then into an 80-liter bag. Aerosol deposited in the "T" and elbow, endotracheal tube, large airway model, and collection bag was quantitated separately using 0.1% uranine as a tracer. Study of a conventional aerosol typical of those in common clinical use (aerodynamic mass median diameter = 3.95 microns) showed that most of the aerosol delivered into each endotracheal tube was deposited before leaving the mainstem bronchi. Substitution of an alternative nebulizer that produced a much smaller aerosol particle size (aerodynamic mass median diameter = 0.54 micron) dramatically decreased aerosol deposition in the "T" and elbow, endotracheal tube, and large airway model, and increased the quantity of aerosol penetrating beyond the mainstem bronchi up to ninefold. The mass median particle diameter of the conventional aerosol was reduced during endotracheal tube and large airway passage by poorly defined aerodynamic mechanisms that selectively removed larger particles. The smaller submicron aerosol was not similarly affected. Thus, conventional therapeutic aerosols appear to penetrate poorly through endotracheal tubes. Use of smaller particle size aerosols in treatment of intubated patients may be an effective way to circumvent this problem.
journal_name
Pediatr Pulmonoljournal_title
Pediatric pulmonologyauthors
Ahrens RC,Ries RA,Popendorf W,Wiese JAdoi
10.1002/ppul.1950020108subject
Has Abstractpub_date
1986-01-01 00:00:00pages
19-26issue
1eissn
8755-6863issn
1099-0496journal_volume
2pub_type
杂志文章abstract::Physicians and physiotherapists who care for CF patients have recommended the use of trampolines as a physiotherapeutic tool for enhancing cardiopulmonary performance, encouraging sputum production, and improving general well-being. Despite some therapeutic and recreational benefits associated with trampoline use, pap...
journal_title:Pediatric pulmonology
pub_type: 杂志文章,评审
doi:10.1002/ppul.20133
更新日期:2005-01-01 00:00:00
abstract::Wheezing is the most widely reported adventitious lung sound in the English language. It is recognized by health professionals as well as by lay people, although often with a different meaning. Wheezing is an indicator of airway obstruction and therefore of interest particularly for the assessment of young children an...
journal_title:Pediatric pulmonology
pub_type: 杂志文章,评审
doi:10.1002/ppul.23930
更新日期:2018-02-01 00:00:00
abstract::Corticosteroids continue to be used by many physicians to treat infants with bronchiolitis. The aim of this study was to examine the short-term and long-term efficacy of oral corticosteroid therapy when added to beta2-agonists in infants with mild to moderate bronchiolitis (defined as the first episode of wheezing ass...
journal_title:Pediatric pulmonology
pub_type: 临床试验,杂志文章,随机对照试验
doi:10.1002/(sici)1099-0496(199809)26:3<162::aid-ppul2
更新日期:1998-09-01 00:00:00
abstract::Angiogenesis is an important mechanism of airway remodeling in lung disease. We previously demonstrated that serum vascular endothelial growth factor (VEGF) is elevated in cystic fibrosis (CF) patients and declines with therapy for pulmonary exacerbation. We hypothesized that VEGF is elevated early in the course of CF...
journal_title:Pediatric pulmonology
pub_type: 杂志文章
doi:10.1002/ppul.21428
更新日期:2011-07-01 00:00:00
abstract::The gasdermin A (GSDMA) and gasdermin B (GSDMB) genes are located at 17q21.2. The GSDM family genes have been studied in the gastrointestinal tract but recent reports suggest that GSDMB is associated with childhood asthma in several populations. We investigated the association of the GSDMA and GSDMB variants with asth...
journal_title:Pediatric pulmonology
pub_type: 杂志文章
doi:10.1002/ppul.21424
更新日期:2011-07-01 00:00:00
abstract:OBJECTIVES:A pilot study to compare pulmonary mechanics in a neonatal intensive care unit (NICU) cohort, specifically, comparing lung elastance between male and female infants in the NICU. HYPOTHESIS:Anecdotally, male infants are harder to ventilate than females. We hypothesize that males have higher model-based elast...
journal_title:Pediatric pulmonology
pub_type: 杂志文章
doi:10.1002/ppul.24538
更新日期:2020-01-01 00:00:00
abstract::Sleep disordered breathing (SDB) represents a spectrum of breathing disorders, ranging from snoring to obstructive sleep apnea syndrome (OSAS), that disrupt nocturnal respiration and sleep architecture. OSAS is a common disorder in children, with a prevalence of 2-3%. It is associated with neurobehavioral, cognitive, ...
journal_title:Pediatric pulmonology
pub_type: 杂志文章,评审
doi:10.1002/ppul.20943
更新日期:2008-12-01 00:00:00
abstract:BACKGROUND:Prone sleeping position, use of soft mattresses and head covering by bedclothes are known risk factors for sudden infant death syndrome (SIDS). Rebreathing carbon dioxide (CO(2) ) may be a possible mechanism or a confounding factor of SIDS. OBJECTIVE:To compare the aeration properties of a new concept of in...
journal_title:Pediatric pulmonology
pub_type: 杂志文章
doi:10.1002/ppul.21351
更新日期:2011-02-01 00:00:00
abstract::The structure, distribution, and frequency of neuroendocrine (NE) cells in human fetal lung from early stages of development to term are described. Neuroendocrine cells were studied by electron microscopy and immunostaining for serotonin and bombesin, recently identified markers of these cells in human lung. The diffe...
journal_title:Pediatric pulmonology
pub_type: 杂志文章
doi:
更新日期:1985-05-01 00:00:00
abstract::Little is known about the respiratory behavior of the intercostal muscles within a neonatal and developmental context. We, therefore, examined intercostal muscle electromyographic (EMG) activity in kittens (1 month old, n = 8; 2 months old, n = 7) during eupnea and heightened respiratory drive induced by hypercapnia. ...
journal_title:Pediatric pulmonology
pub_type: 杂志文章
doi:10.1002/ppul.1950050407
更新日期:1988-01-01 00:00:00
abstract:BACKGROUND:In cystic fibrosis (CF), the spectrum and frequency of CFTR variants differ by geography and race/ethnicity. CFTR variants in White patients are well-described compared with Latino patients. No studies of CFTR variants have been done in patients with CF in the Dominican Republic or Puerto Rico. METHODS:CFTR...
journal_title:Pediatric pulmonology
pub_type: 杂志文章
doi:10.1002/ppul.24549
更新日期:2020-02-01 00:00:00
abstract:OBJECTIVE:Obstructive sleep apnea/hypopnea syndrome (OSAHS) is a common sleep problem. The aim of this study is to investigate the association between OSAHS and blood pressure (BP) in snoring children. METHODS:Snoring children were recruited from January 2009 to December 2010. Clinical history was taken accompanied by...
journal_title:Pediatric pulmonology
pub_type: 杂志文章
doi:10.1002/ppul.22595
更新日期:2013-03-01 00:00:00
abstract:BACKGROUND:Asthma is a disease with reversible bronchoconstriction; however, some patients develop fixed airflow obstruction (FAO). Previous studies have reported the incidence and risk factors of FAO in adults; however, the corresponding factors in children remain poorly understood. AIM:To evaluate the incidence and ...
journal_title:Pediatric pulmonology
pub_type: 杂志文章
doi:10.1002/ppul.24625
更新日期:2020-03-01 00:00:00
abstract:BACKGROUND:Although the benefits of recombinant human deoxyribonuclease (dornase alfa) in patients with cystic fibrosis (CF) are established, its optimal timing in relation to physiotherapy is unknown. As its enzymatic effect lasts for 6-11 hr, dornase alfa may be more efficacious if the time interval between inhalatio...
journal_title:Pediatric pulmonology
pub_type: 杂志文章,多中心研究,随机对照试验
doi:10.1002/ppul.20704
更新日期:2007-12-01 00:00:00
abstract::With dual energy X-ray absorptiometry (DEXA), it is possible to quantitate important aspects of growth in children with cystic fibrosis (CF), supplementing the usual measures of height and weight. Of particular concern during growth is the accumulation of bone mineral, since osteoporosis and fractures are well-recogni...
journal_title:Pediatric pulmonology
pub_type: 杂志文章
doi:10.1002/(sici)1099-0496(199902)27:2<80::aid-ppul3>
更新日期:1999-02-01 00:00:00
abstract::Plasminogen deficiency is characterized by fibrin-rich pseudomembrane formation on all mucosal surfaces, particularly the conjunctiva. Respiratory system involvement is common; fibrin often obstructs the upper or lower respiratory tract, causing death. Although many treatments have been applied, no definitive treatmen...
journal_title:Pediatric pulmonology
pub_type: 杂志文章
doi:10.1002/ppul.24563
更新日期:2020-01-01 00:00:00
abstract::Even though childhood asthma is assumed to comprise reversible airway obstruction, some children develop irreversible airway obstruction (not reversed by a bronchodilator or corticosteroids); this may be due to inflammation that has caused remodeling. Lately, it has been claimed that in the absence of treatment with i...
journal_title:Pediatric pulmonology
pub_type: 杂志文章
doi:10.1002/ppul.10090
更新日期:2002-04-01 00:00:00
abstract::Our purpose was to identify and further characterize physiologic mechanisms relevant to autoresuscitation from hypoxic apnea in infants dying suddenly and unexpectedly. We studied cardiorespiratory recordings of 24 infants (age range, 0.8-21 months) who died suddenly while being monitored at home. These recordings wer...
journal_title:Pediatric pulmonology
pub_type: 杂志文章
doi:10.1002/ppul.10287
更新日期:2003-08-01 00:00:00
abstract::The fixed-combination metered aerosol lK6 (fenoterol 0.05 mg/puff, ipratropium bromide 0.02 mg/puff--Berodual, Boehringer-Ingelheim Ltd., Ridgefield, Conn.) was administered to 12 children (8 boys, 4 girls) aged 3 1/2 to 6 2/12 years who had extrinsic bronchial asthma. Three forms of administration, each with a differ...
journal_title:Pediatric pulmonology
pub_type: 杂志文章
doi:10.1002/ppul.1950010605
更新日期:1985-11-01 00:00:00
abstract:BACKGROUND:Several studies have shown that exposure to air pollutants affects lung growth and development and can result in poor respiratory health in early life. METHODS:We included a subsample of 772 Mexican preschoolers whose mothers participated in a Prenatal Omega-3 fatty acid Supplements, GRowth, And Development...
journal_title:Pediatric pulmonology
pub_type: 杂志文章
doi:10.1002/ppul.24889
更新日期:2020-08-01 00:00:00
abstract:BACKGROUND:Mesenchymal stromal cell (MSC)-mediated therapeutic effects have been observed in the treatment of lung diseases. For the first time, this treatment was used as rescue therapy in a pediatric patient with a life-threatening respiratory syndrome associated with the filamin A (FLNA) gene mutation. METHODS:A ch...
journal_title:Pediatric pulmonology
pub_type: 杂志文章
doi:10.1002/ppul.24497
更新日期:2020-01-01 00:00:00
abstract::Nine young asthmatic children aged 2-5 years underwent methacholine challenge after placebo or albuterol administered by metered dose inhaler through a spacer device (Babyhaler) with a face mask in a double-blind, cross-over, randomized study. The methacholine challenge was performed using chest auscultation to define...
journal_title:Pediatric pulmonology
pub_type: 临床试验,杂志文章,随机对照试验
doi:10.1002/ppul.1950170503
更新日期:1994-05-01 00:00:00
abstract:INTRODUCTION:The prevalence of both childhood obesity and childhood asthma has increased dramatically over the past few decades. Little is known concerning the role of body composition and lifestyle influences on airway health in children. PURPOSE:To determine whether body composition, fruit and vegetable intake (FV) ...
journal_title:Pediatric pulmonology
pub_type: 杂志文章
doi:10.1002/ppul.21393
更新日期:2011-05-01 00:00:00
abstract::Pulmonary hemangioma is a rare benign tumor of the lungs. Airway hemangiomas in particular may lead to feeding difficulties, barking cough, stridor, respiratory distress, and even acute airway obstruction. Hence, such hemangiomas usually require early and aggressive treatment; however, the treatment modalities employe...
journal_title:Pediatric pulmonology
pub_type: 杂志文章
doi:10.1002/ppul.23008
更新日期:2014-08-01 00:00:00
abstract::Exercise-induced asthma (EIA) is a possible cause of poor physical performance in children. No data are available on the value of respiratory symptoms to discriminate children with bad physical fitness from children with EIA. We evaluated respiratory symptoms in school-age children during and after exercise in relatio...
journal_title:Pediatric pulmonology
pub_type: 杂志文章
doi:10.1002/ppul.20185
更新日期:2005-04-01 00:00:00
abstract:BACKGROUND:Asthma is a chronic lower airway inflammatory disease. Nitric oxide is an inflammatory mediator produced endogenously in the airway. Previous studies have demonstrated that the fractional concentration of exhaled nitric oxide (FeNO) is increased in asthma. OBJECTIVES:To investigate if FeNO concentrations we...
journal_title:Pediatric pulmonology
pub_type: 杂志文章
doi:10.1002/ppul.22705
更新日期:2013-06-01 00:00:00
abstract::The purpose of this study was to compare the pathogens obtained by oropharyngeal suction (OPS) and bronchoalveolar lavage (BAL) in children with chronic pulmonary infections. Forty-four children (mean age of 6.1 years; range 4 months to 15 years) were included in the study (27 children with recurrent localized lung in...
journal_title:Pediatric pulmonology
pub_type: 杂志文章
doi:10.1002/ppul.1950200108
更新日期:1995-07-01 00:00:00
abstract::Our objective was to compare the effectiveness of maximum forced expiratory flow measured at functional residual capacity (V'maxFRC) and the ratio of flow at 75% of the forced expiratory volume to peak forced expiratory flow (FEF(75)/FEF(peak)) for detecting bronchodilator-related changes in wheezy infants. In 55 infa...
journal_title:Pediatric pulmonology
pub_type: 临床试验,杂志文章
doi:10.1002/ppul.10325
更新日期:2003-09-01 00:00:00
abstract:OBJECTIVE:To determine the interpretative consequences of adopting the Global Lungs 2012 (GLI-2012) spirometric prediction equations in a pediatric hospital population. MATERIAL:Spirometric records from 2,192 white boys and 1,842 white girls, and 412 and 334 African-American boys and girls, respectively, aged 6.0-18.0...
journal_title:Pediatric pulmonology
pub_type: 杂志文章
doi:10.1002/ppul.22876
更新日期:2014-02-01 00:00:00
abstract::It has been suggested that children with asthma recover more quickly from exercise-induced bronchoconstriction than adults. On the basis of clinical observation we hypothesized that recovery rate from exercise-induced asthma (EIA) in childhood also decreases with age. In 14 children (aged 7-12 years) with a history of...
journal_title:Pediatric pulmonology
pub_type: 临床试验,杂志文章,随机对照试验
doi:10.1002/ppul.1950200309
更新日期:1995-09-01 00:00:00