Abstract:
:We examined the effects of within-breath changes in compliance (C) upon the accuracy of measurements of compliance and resistance (R) by linear regression analysis and by Mead and Wittenberger's method. These effects were illustrated by a computer model and by lung models with linear and nonlinear pressure/volume relationships, and were also studied in 14 normal spontaneously breathing premature infants (mean +/- SD, BW 1,290 +/- 200 g, GA 29.9 +/- 2.7 weeks, age 7.4 +/- 2.1 days). Flow was measured by pneumotachography and tidal volume was derived as digitally integrated flow, and transpulmonary pressure as airway minus esophageal pressure. We found that C and R calculated from the equation of motion is accurate only if C and R remain constant throughout the respiratory cycle. Calculated compliance depends more on C at the end than at the beginning of inspiration. A decreasing C leads to underestimation or R, while an increasing C leads to an overestimation of inspiratory R. Calculated total R may be accurate, but with low r values for measurement points. Mead and Wittenberger's method and the regression method are similarly affected by changing C; however, since the regression method is based on many more measurement points and therefore allows the detection and analysis of within-breath changes of C and R, it is less prone to erroneous results secondary to signal artifacts than Mead and Wittenberger's method.
journal_name
Pediatr Pulmonoljournal_title
Pediatric pulmonologyauthors
Silva Neto G,Gerhardt T,Silberberg A,Gerhardt T,Claure N,Duara S,Bancalari Edoi
10.1002/ppul.1950120304subject
Has Abstractpub_date
1992-03-01 00:00:00pages
146-52issue
3eissn
8755-6863issn
1099-0496journal_volume
12pub_type
杂志文章abstract::The aim of this study was to examine a possible association between birth season (date of birth) and future development of asthma in children. A case-control study was designed to include asthmatic children aged 2-7 years, living in the city of Beer-Sheva, in southern Israel, registered in one pediatric center. Contro...
journal_title:Pediatric pulmonology
pub_type: 杂志文章
doi:10.1002/ppul.20442
更新日期:2006-12-01 00:00:00
abstract:AIM:To analyze breathing pattern and mechanical ventilatory constraints during incremental exercise in healthy and cystic fibrosis (CF) children. METHODS:Thirteen healthy children and 6 children with cystic fibrosis volunteered to perform an incremental test on a treadmill. Exercise tidal flow/volume loops were plotte...
journal_title:Pediatric pulmonology
pub_type: 杂志文章
doi:10.1002/ppul.22804
更新日期:2014-03-01 00:00:00
abstract:INTRODUCTION:Exercise ventilation efficiency index in cardiopulmonary exercise testing (CPET) is elevated in patients with heart failure providing useful information on disease progression and prognosis. Few data, however, exist for ventilation efficiency index among cystic fibrosis (CF) patients. AIMS:To assess venti...
journal_title:Pediatric pulmonology
pub_type: 杂志文章
doi:10.1002/ppul.24438
更新日期:2019-10-01 00:00:00
abstract:OBJECTIVES:To investigate the effect of position on the strength of the Hering-Breuer reflex in prematurely born infants and determine whether any differences seen were related to differences in lung or tidal volume between positions. WORKING HYPOTHESIS:Position related differences in the strength of the Hering-Breuer...
journal_title:Pediatric pulmonology
pub_type: 杂志文章
doi:10.1002/ppul.20855
更新日期:2008-08-01 00:00:00
abstract::Stachybotrys chartarum (atra) is a toxic mold that grows on water-damaged cellulose-based materials. Research has revealed also that inhalation of S. chartarum spores caused marked changes in respiratory epithelium, especially to developing lungs. We analyzed the epigenetic potential of S. chartarum spore toxins on de...
journal_title:Pediatric pulmonology
pub_type: 杂志文章
doi:10.1002/ppul.20608
更新日期:2007-07-01 00:00:00
abstract::Since July 1988, a total of 92 transbronchial biopsies (TBB) have been performed in 18 patients (aged 3-16 years). Twelve patients (67%) were heart-lung transplant (HLT) recipients undergoing surveillance for pulmonary graft rejection and infection. The remainder included immunocompromised patients at risk of opportun...
journal_title:Pediatric pulmonology
pub_type: 杂志文章
doi:10.1002/ppul.1950120408
更新日期:1992-04-01 00:00:00
abstract::The clinical course of sarcoidosis in children has not been well defined. Eight children with symptomatic sarcoidosis included in this study underwent pulmonary function tests and bronchoscopy with bronchoalveolar lavage (BAL) before treatment and during steroid therapy. At the start of therapy, functional parameters,...
journal_title:Pediatric pulmonology
pub_type: 杂志文章
doi:10.1002/ppul.1950160109
更新日期:1993-07-01 00:00:00
abstract::We tested a health education intervention program to reduce passive smoking in infancy. The aim was to develop an instrument for study of tobacco smoke exposure and childhood respiratory illness. One hundred and eighty-four women who had smoked during pregnancy were allocated by month of delivery to an intervention gr...
journal_title:Pediatric pulmonology
pub_type: 杂志文章
doi:10.1002/ppul.1950030311
更新日期:1987-05-01 00:00:00
abstract::A new method that permits the measurement of adult-type maximal expiratory flow-volume curves and fractional lung volumes in sedated infants was recently described. The purpose of this study was to define the normal range for these new measures of pulmonary function in infants and young children. Measurements of force...
journal_title:Pediatric pulmonology
pub_type: 临床试验,杂志文章
doi:10.1002/1099-0496(200009)30:3<215::aid-ppul6>3.0.c
更新日期:2000-09-01 00:00:00
abstract:OBJECTIVES:The present pilot study was performed to evaluate the HPA axis and ANS activity by measuring salivary cortisol and α-amylase diurnal trajectory and production, respectively, in mild or moderate-to-severe (MS) OSA-affected, but otherwise healthy, children. Moreover, a correlative analysis was performed betwee...
journal_title:Pediatric pulmonology
pub_type: 杂志文章
doi:10.1002/ppul.22972
更新日期:2014-11-01 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::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::Mucus plugging constitutes a nutrient-rich nidus for a bacterial infection that has long been recognized as a potent stimulus for neutrophilic airway inflammation driving progressive lung damage in people with cystic fibrosis (CF). However, mucus plugging and neutrophilic inflammation are already present in many infan...
journal_title:Pediatric pulmonology
pub_type: 杂志文章,评审
doi:10.1002/ppul.24462
更新日期:2019-11-01 00:00:00
abstract::While the use of the raised volume rapid thoraco-abdominal compression (RVRTC) technique has been shown to provide new insights into airway and pulmonary pathophysiology in infants, and appears to resemble the spirometric techniques used in older subjects, there is as yet no consensus regarding measurement procedures,...
journal_title:Pediatric pulmonology
pub_type: 杂志文章
doi:10.1002/ppul.10170
更新日期:2002-11-01 00:00:00
abstract:BACKGROUND:Child exposure to cigarette smoke is harmful. It should be reduced through parental smoking cessation interventions. The aim of our study was to determine the impact of simple advice provided by the pediatrician on the smoking habits of parents of children with cystic fibrosis (CF), diabetes mellitus (DM) an...
journal_title:Pediatric pulmonology
pub_type: 杂志文章
doi:10.1002/ppul.25277
更新日期:2021-01-22 00:00:00
abstract:OBJECTIVE:Asthma is the most common chronic disease of childhood. Although asthma admissions to the pediatric intensive care unit (PICU) are increasing, there are no evidence-based guidelines on preferred escalation of therapies for patients with status asthmaticus who fail to respond to inhaled bronchodilators and sys...
journal_title:Pediatric pulmonology
pub_type: 杂志文章
doi:10.1002/ppul.24821
更新日期:2020-07-01 00:00:00
abstract:OBJECTIVE:To determine reference values of sniff nasal inspiratory pressure (SNIP) in healthy children. METHODS:This cross-sectional observational study included healthy children aged 6 to 11 years of both sexes. The volunteers underwent a pulmonary function test to rule out respiratory disorders. Respiratory muscle s...
journal_title:Pediatric pulmonology
pub_type: 杂志文章
doi:10.1002/ppul.24591
更新日期:2020-02-01 00:00:00
abstract::It has been suggested that cystic fibrosis (CF) patients harboring multiresistant (MR) Pseudomonas aeruginosa (PA) should be seen in separate clinics. The aim of this study was to test the feasibility of this by longitudinally studying the consistency of isolates of MRPA in individuals. We analyzed all respiratory tra...
journal_title:Pediatric pulmonology
pub_type: 杂志文章
doi:10.1002/ppul.10262
更新日期:2003-04-01 00:00:00
abstract::We reviewed the literature on the effects of high flow nasal cannula (HFNC) and heated, humidified, high-flow, nasal cannula (HHHFNC) treatment in preterm infants. We found nine studies, but only two were randomized controlled trials. These studies show that: HFNC application is associated to the delivery of continuou...
journal_title:Pediatric pulmonology
pub_type: 杂志文章,评审
doi:10.1002/ppul.21051
更新日期:2009-07-01 00:00:00
abstract:OBJECTIVE:Respiratory illnesses compose the most common diagnoses of patients admitted to pediatric intensive care units. In pediatrics, high-flow nasal cannula (HFNC) therapy is an intermediate level of respiratory support with variability in practice. We conducted a pre-post intervention study of patients placed on H...
journal_title:Pediatric pulmonology
pub_type: 杂志文章
doi:10.1002/ppul.25214
更新日期:2020-12-09 00:00:00
abstract::For patients whose asthma remains in poor control necessitating high utilization of medical services, a referral to a specialized "center of excellence" is often considered. A decade ago, we evaluated our pediatric asthma program of long-term hospitalization (median stay of 75 days) and found significant decreases in ...
journal_title:Pediatric pulmonology
pub_type: 杂志文章
doi:10.1002/ppul.1027
更新日期:2001-03-01 00:00:00
abstract:OBJECTIVES:To prospectively assess longitudinal lung function in children with sickle cell disease (SCD). WORKING HYPOTHESIS:Lung function in SCD children deteriorates with increasing age and the decline is more marked in younger children who have recently suffered ACS episodes. STUDY DESIGN:Two prospective longitudi...
journal_title:Pediatric pulmonology
pub_type: 杂志文章
doi:10.1002/ppul.23367
更新日期:2016-07-01 00:00:00
abstract::The effects of current methods of bone marrow transplantation (BMT) on pulmonary function in children have not been extensively studied. We reviewed serial pulmonary function tests (PFTs) in 25 children (median age, 9 yr; range, 4-15) who received allogeneic (n = 14) or autologous (n = 11) BMT for neoplastic diseases ...
journal_title:Pediatric pulmonology
pub_type: 杂志文章
doi:10.1002/ppul.1950180604
更新日期:1994-12-01 00:00:00
abstract:INTRODUCTION:Induced sputum sampling holds promise as a method for obtaining samples representative of the lower airways in young children. Collection of induced sputum samples in young children differs from older children and adults' as pharyngeal suctioning is often required. Our aim was to determine the sensitivity ...
journal_title:Pediatric pulmonology
pub_type: 杂志文章
doi:10.1002/ppul.23636
更新日期:2017-02-01 00:00:00
abstract::Pulmonary hemorrhage (PH) is a serious complication causing acute respiratory distress in the premature infant, and it is associated with significant mortality and morbidity. The role of inflammatory mediators in this condition is largely undefined. Serial tracheal aspirates (TA) were obtained at intervals from 65 mec...
journal_title:Pediatric pulmonology
pub_type: 杂志文章
doi:10.1002/ppul.10141
更新日期:2002-08-01 00:00:00
abstract::Better growth and nutritional status is strongly associated with better pulmonary function and survival in children with CF. Behavioral intervention is an efficacious treatment approach for improving calorie intake and weight gain in children with CF; and recently has been shown to facilitate maintenance of daily ener...
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.21147
更新日期:2010-01-01 00:00:00
abstract::Lung scintigraphy has been used to evaluate the degree of pulmonary hypoplasia in infants with congenital diaphragmatic hernia (CDH). However, the relationship between lung scintigraphy and long-term outcome of CDH remains unclear. The aim of this study is to determine whether lung scintigraphy correlates with long-te...
journal_title:Pediatric pulmonology
pub_type: 杂志文章
doi:10.1002/ppul.20466
更新日期:2006-09-01 00:00:00
abstract::Patients with cystic fibrosis (CF) can be discriminated from healthy subjects by measurement of the nasal potential difference, which has become a useful outcome measure for therapies directed toward correcting defective electrolyte transport in CF. A standard operating procedure was developed by a CF Foundation clini...
journal_title:Pediatric pulmonology
pub_type: 杂志文章,多中心研究
doi:10.1002/ppul.10448
更新日期:2004-05-01 00:00:00
abstract::Spirometry is used to monitor respiratory progress in children with Duchenne muscular dystrophy (DMD). Mucociliary clearance depends on cough strength, which can be measured by peak cough flow (PCF). It is not routinely measured in most centers. When the PCF falls below 270 l/min, mucociliary clearance is likely to be...
journal_title:Pediatric pulmonology
pub_type: 杂志文章
doi:10.1002/ppul.20151
更新日期:2005-05-01 00:00:00
abstract::Previous research has demonstrated a significant reciprocal relationship between psychosocial factors and asthma morbidity in children. The National Cooperative Inner-City Asthma Study investigated both asthma-specific and non-specific psychosocial variables, including asthma knowledge beliefs and management behavior,...
journal_title:Pediatric pulmonology
pub_type: 杂志文章,多中心研究
doi:10.1002/(sici)1099-0496(199710)24:4<263::aid-ppul5
更新日期:1997-10-01 00:00:00