CAPNOGRAFIA VOLUMETRICA PDF

During expiration, acini in lung base are assumed to empty first followed by those in the apex, thus producing the rising N2 alveolar plateau measured at the mouth This sequential emptying idea cannot simultaneously explain the shape of both the CO2 and N2 washout curves. It is well established that in healthy upright individuals during normal breathing the CO2 concentration is lower in the acini located in the apex of the lung less ventilated but far less perfused than in acini located in the base better ventilated and better perfused Sequential emptying in the same sequence as in the case of N2 washout, with the apex emptying last, would result in a CO2 washout curve recorded in the mouth with a downward-sloping alveolar plateau rather than the upward-sloping alveolar plateau that is almost always observed. In their paper on VCap in children23, postulated that the observed decrease in normalized phase 3 slopes of CO2 washout curves with increasing age was due to an increase in the interface between functional residual capacity FRC and tidal volume VT with lung growth in children. Apparently, taking into account the significantly smaller normalized values of phase 3 slopes in obese patients, a hypothesis can be put forward: obese patients may have larger or more efficient alveolated airspaces than non-obese subjects.

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Celize C. Almeida I ; Armando A. Ribeiro I ; Marcos T. Palavras-chave: Capnografia, espirometria, pediatria, asma. All of them underwent volumetric capnography and spirometry. All asthmatics repeated the tests after bronchodilator use. Among asthma patients, 33 underwent methacholine challenge test, and measures were recorded on three occasions: before and after methacholine and after bronchodilator use. After bronchodilator use, there was an increase in spirometric variables, volume of anatomic dead space, and decrease in the slope of phase II normalized by tidal volume, but the slope of phase III normalized by tidal volume did not change.

After methacholine, there was an increase in this variable, which decreased after bronchodilator use. Keywords: Capnography, spirometry, pediatrics, asthma. Bourdin et al. Kars et al. Verbanck et al. Olsson et al. Peripheral airway function in childhood asthma, assessed by single-breath He and SF6 washout. Pediatr Pulmonol. Ventilation heterogeneity in children with well controlled asthma with normal spirometry indicates residual airways disease. Nitrogen washout slope in poorly controlled asthma.

Nonreversible conductive airway ventilation heterogeneity in mild asthma. J Appl Physiol. Fletcher R. Relationship between alveolar deadspace and arterial oxygenation in children with congenital cardiac disease.

Br J Anaesth. Respiratory deadspace measurements in neonates during extracorporeal membrane oxygenation. Crit Care Med. Respiratory deadspace measurements in neonates with congenital diaphragmatic hernia. Deadspace to tidal volume ratio predicts successful extubation in infants and children. Dead space ventilation in critically ill children with lung injury.

Pediatr Crit Care Med. Capnographic measures. Capnography: clinical aspects. Carbon dioxide over time and volume. Cambridge: Cambridge University Press.

Changes in airway dead space in response to methacholine provocation in normal subjects. Clin Physiol. Unevenness of ventilation assessed by the expired CO 2 gas volume versus V T curve in asthmatic patients.

Respir Physiol Neurobiol. Volumetric capnography and chronic obstructive pulmonary disease staging. Volumetric capnography for the evaluation of pulmonary disease in adult patients with cystic fibrosis and noncystic fibrosis bronchiectasis. Volumetric capnography in children. Influence of growth on the alveolar plateau slope.

Capnovolumetry: a new tool for lung function testing in children with asthma. Clin Physiol Funct Imaging. Ribeiro MA. Global initiative for asthma GINA. USA, Standardisation of spirometry. Eur Respir J. Does phase 2 of the expiratory PCO2 versus volume curve have diagnostic value in emphysema patients?

Ventilation distribution during histamine provocation. Macklem PT. The physiology of small airways. Jeffery PK. Comparison of the structural and inflammatory features of COPD and asthma. Giles F. Filley Lecture. Airways remodeling is a distinctive feature of asthma and is related to severity of disease.

Inflammation of small airways in asthma. J Allergy Clin Immunol. Imaging of small airways disease. Inflammatory cell distribution within and along asthmatic airways. Horsley A.

Lung clearance index in the assessment of airways disease. Respir Med. Almeida Rua Jasmim, , torre 1, ap. Volumetric capnography to detect ventilation inhomogeneity in children and adolescents with controlled persistent asthma. J Pediatr Rio J. All the contents of this journal, except where otherwise noted, is licensed under a Creative Commons Attribution License.

Services on Demand Journal. Carlos Gomes, cj. How to cite this article.

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Capnografia Volumétrica

Celize C. Almeida I ; Armando A. Ribeiro I ; Marcos T. Palavras-chave: Capnografia, espirometria, pediatria, asma. All of them underwent volumetric capnography and spirometry. All asthmatics repeated the tests after bronchodilator use.

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Nos orgullece el contar con tantos clientes entregados y entusiastas. Bedside noninvasive detection of acute pulmonary embolism in critically ill surgical patients. Arch Surg ; 8 —; discussion — Partitioning of dead space — a method and reference values in the awake human. Eur Respir J.

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