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Results for “Respiratory System Abnormalities”

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At least 19 recordsLinked to original sources
PubMed1998

A cepstral method for analysis of acoustic transmission characteristics of respiratory system.

The generation and transmission process of transmitted sound signals (TSS) is analyzed and a mathematical model of TSS is established in this paper. The power cepstral characteristics of TSS are studied based on the mathematical model and a new analysis method of acoustic transmission of respiratory system using homomorphic processing technique is proposed. The experimental results show that the normal respiratory system has only one formant, while the abnormal respiratory system presenting lung consolidation has two formants and the second formant plays important role in that system. This new method is a simple and effective one.

Adult↗
PubMed1996

Respiratory function in children with neuromuscular disease.

Respiratory failure is the most common cause of death in children with neuromuscular disease (NMD). This article provides a conceptual framework for understanding failure of the respiratory pump in these children. Pump failure can be attributed to faulty control of respiration, to mechanical defects, and to respiratory muscle fatigue. In most patients with NMD, respiratory drive is intact. Mechanical defects can be due to either an abnormal pump or an excessive respiratory load on which the pump must operate. In patients with NMD, the weak respiratory muscles cannot generate normal respiratory pressures. Furthermore, inefficient chest wall motion leads to increased work for the respiratory system. Abnormalities of lung and chest wall compliance increase respiratory load. The combination of a weak, inefficient respiratory pump and an abnormally high elastic load can predispose these patients to respiratory muscle fatigue. Respiratory muscle rest with nocturnal assisted ventilation, therefore, provides a rational approach to the treatment of chronic respiratory failure in patients with NMD. Areas of future research that may prove useful in the care of children with respiratory failure due to NMD include: the development of better ways of assessing respiratory muscle fatigue; studies to increase understanding of the role of mechanical ventilation in improving chest wall and respiratory pump function; and studies delineating the role of respiratory muscle training in these patients.

Child↗
PubMed1998

Prevention and treatment of upper airway obstruction in infants and children.

This review examines some of the recent advances made in the prevention and treatment of upper airway obstruction in infancy and childhood. In some instances, the advances are the result of experimental studies that corroborate or refute therapeutic notions that had been adopted prematurely. Studies performed in the past few years, for instance, have demonstrated that both systemic and local corticosteroid treatments are indeed effective in the treatment of viral croup. In contrast, other studies carried out in the same period raise doubts about the usefulness of these medications in the prevention of postextubation laryngeal edema. In other instances, the advances are the result of pioneering efforts to correct anatomical defects, usually congenital, that cause severe airway obstruction. Tracheal and laryngeal stenoses and craniofacial deformities, which only 5 years ago would have been palliated by tracheotomy, undergo now routine primary correction. Despite all these advances, upper airway obstruction remains an important source of morbidity and mortality in early childhood.

Adrenal Cortex Hormones↗
PubMed1990

[Are there new aspects in thoracic surgery in children?].

A comparison was made between the operations of the respiratory tract in childhood and their associated bronchological examinations were analyzed and also there were other kinds of indication for examination and operation. The surgical therapy of abnormalities has the priority.

Child↗
PubMed1999

De novo complete trisomy 5p: clinical report and FISH studies.

We describe a de novo trisomy 5p in a 1-year-old severely retarded boy. The complete short arm of chromosome 5 segregated as an additional marker chromosome in all metaphases. The marker was identified as 5p by conventional cytogenetic techniques (GTG, GBG, CBG) and molecular cytogenetic techniques (whole chromosome-painting probe, probes for the cri-du-chat region and the centromere, and additionally high-resolution multicolor banding using a chromosome 5-specific DNA probe cocktail). The clinical findings were similar to the established trisomy 5p phenotype including macrocephaly, facial abnormalities, tracheobronchial defects with subsequent respiratory infections, hypotonia, and psychomotor retardation. To the best of our knowledge this is the first description of an isolated complete 5p trisomy without involvement of the aberrant chromosome in any structural chromosomal rearrangements.

Centromere↗
PubMed1988

Acute respiratory failure following pharmacologically induced hyperventilation: an experimental animal study.

The pulmonary effects of hyperventilation following infusion of sodium salicylate into the cisterna magna was studied in 16 spontaneously breathing adult sheep. We found a fall in PaO2, a decrease in the static compliance of the respiratory system, abnormal chest roentgenographic films, and grossly abnormal lungs following 3.5 to 13 h of hyperventilation. A control group of 15 sheep (10 sheep similarly injected with sodium salicylate, but then sedated and paralyzed and ventilated at normal tidal volume and respiratory rate on a mechanical ventilator, and 5 sheep infused with saline alone and breathing spontaneously) showed no pulmonary or arterial blood gas abnormalities. We conclude that prolonged hyperventilation under the conditions of this experiment precipitated events that resulted in acute lung injury.

Animals↗
PubMed1989

[Stridor in children].

Stridor is the presenting symptom of abnormalities of larynx and trachea in children. The anatomical differences in size and consistency of the larynx play a crucial role in stridor in children as compared with adults. From 1983 to 1988, 81 children (65 males, 16 females) with severe or prolonged stridor were admitted to our hospital. Thorough examination, including endoscopy of larynx and trachea and radiology revealed various congenital abnormalities and acquired conditions as the cause of stridor. Congenital laryngeal anomalies accounted for stridor in 26 children, there were 12 children with congenital tracheal or vascular anomalies, 28 with infectious diseases and 15 with other diseases. Intubation and (or) tracheotomy were performed in one-third of the patients: 5 of them died of severe complications. For proper treatment of children with stridor it is essential to investigate its aetiology carefully.

Child↗
PubMed1997

Congenital thoracic masses: imaging features in the adult.

Congenital anomalies in the adult thorax are frequently asymptomatic and may remain undetected for many years. Whether they then become symptomatic or are discovered as an incidental finding on an imaging study obtained for unrelated reasons, thoracic anomalies may appear as masses or contour abnormalities that mimic other pathology, particularly neoplastic disease. The aim of this review is to discuss and illustrate a wide variety of congenital thoracic anomalies that can potentially present as a mass in the thorax. For ease of discussion, lesions are classified under numerous headings, including congenital lung anomalies caused by bronchopulmonary malformations and anomalies of pulmonary vasculature, vascular anomalies of the great vessels, diaphragmatic anomalies, and congenital masses of the chest wall. The appearance of these congenital lesions on chest radiographs and other imaging modalities such as CT, MRI, and angiography are illustrated, with emphasis on features that can distinguish these lesions from other intrathoracic masses.

Adult↗
PubMed1992

Respiratory system stability and abnormal carbon dioxide homeostasis.

We have tested the hypothesis that interactions among eight parameters of the respiratory and cardiovascular systems that determine the loop gain (LG) of the respiratory CO2 feedback control system might account for the degree of stability or instability of breathing patterns in healthy sleeping volunteers as well as in familial dysautonomia (FD) and congenital central hypoventilation syndrome (CCHS) patients. The predictability of cycle duration was tested as well. We measured the values of CO2 sensitivity, CO2 delivery capacity in the circulation, circulation delay, mean lung volume for CO2, and mixed venous PCO2 in 8 FD patients, 2 CCHS patients, and 19 healthy controls. The values of these parameters were used in a mathematical model to compute the LG of the respiratory control system during sleep for each epoch of respiration analyzed. The strength of the ventilatory oscillations (R) was quantified using power density spectra of the ventilation time series. All subjects were studied at inspiratory O2 concentrations (FIO2) of 0.21 and 0.15; CCHS patients and controls were also studied at 0.12 FIO2 to examine the effect of steady-state hypoxia on respiratory system stability. In 2 FD patients, LG was elevated at both levels of FIO2 and periodic breathing was observed; the values of R were elevated. Elevated mixed venous PCO2 and reduced CO2 delivery capacity were chiefly responsible for the abnormally high LG observed. In three healthy volunteers, high LG and unstable patterns were associated with high chemosensitivity. The CCHS patients, however, remained stable even at 0.12 FIO2 because LG remained equivalent to zero due to a lack of chemosensitivity.(ABSTRACT TRUNCATED AT 250 WORDS)

Adolescent↗
PubMedDate not supplied

Is there a place for rigid bronchoscopy in the management of pediatric lung disease?

A review of 364 rigid bronchoscopies in children is presented of whom 55% were younger than 3 years old. The commonest diagnoses in the under 1 year old group were related to congenital anomalies, in the 1-3 year group to inhaled foreign bodies, and in the over 3 year group to bronchiectasis. It is noted that some 30-40% of the tests could have been undertaken with a flexible bronchoscope, but it is suggested that the advantages of the flexible instrument in children with lung disease, as distinct from upper airway disease, are less than in adult practice. Clear benefits for the management of the patient should be obvious before undertaking bronchoscopy in children, and careful consideration should be given to the type of instrument most likely to provide the results desired.

Adolescent↗
PubMed1994

The epidemiology of neonatal respiratory disease.

The epidemiology of many conditions affecting the newborn infant is influenced by the health of the mother, prematurity and the effects of medical and obstetric management. In this review we have considered the role of each of these factors in seven respiratory conditions presenting in the newborn infant.

Apnea↗