scholarly journals Usefulness of continuous monitoring of airway resistance and flow-volume curve in the perioperative management of infants with central airway obstruction: A case of vascular ring

2001 ◽  
Vol 122 (6) ◽  
pp. 1229-1233 ◽  
Author(s):  
Takashi Hishitani ◽  
Kiyoshi Ogawa ◽  
Kenji Hoshino ◽  
Hiroshi Ono ◽  
Takashi Urashima ◽  
...  
Keyword(s):  
Airway Obstruction ◽  
Continuous Monitoring ◽  
Airway Resistance ◽  
Perioperative Management ◽  
Vascular Ring ◽  
Flow Volume ◽  
Central Airway Obstruction ◽  
Volume Curve ◽  
Flow Volume Curve ◽  
Central Airway

scholarly journals Contribution of flow-volume curves to the detection of central airway obstruction

2013 ◽  
Vol 39 (4) ◽  
pp. 447-454 ◽  
Author(s):  
Liliana Barbara Perestrelo de Andrade e Raposo ◽  
Antonio Bugalho ◽  
Maria Joao Marques Gomes
Keyword(s):  
Airway Obstruction ◽  
Sensitivity And Specificity ◽  
Flow Volume ◽  
Central Airway Obstruction ◽  
Volume Curve ◽  
Morphological Criteria ◽  
Flow Volume Curve ◽  
Low Sensitivity ◽  
Location Type ◽  
Central Airway

OBJECTIVE: To assess the sensitivity and specificity of flow-volume curves in detecting central airway obstruction (CAO), and to determine whether their quantitative and qualitative criteria are associated with the location, type and degree of obstruction. METHODS: Over a four-month period, we consecutively evaluated patients with bronchoscopy indicated. Over a one-week period, all patients underwent clinical evaluation, flow-volume curve, bronchoscopy, and completed a dyspnea scale. Four reviewers, blinded to quantitative and clinical data, and bronchoscopy results, classified the morphology of the curves. A fifth reviewer determined the morphological criteria, as well as the quantitative criteria. RESULTS: We studied 82 patients, 36 (44%) of whom had CAO. The sensitivity and specificity of the flow-volume curves in detecting CAO were, respectively, 88.9% and 91.3% (quantitative criteria) and 30.6% and 93.5% (qualitative criteria). The most prevalent quantitative criteria in our sample were FEF50%/FIF50% ≥ 1, in 83% of patients, and FEV1/PEF ≥ 8 mL . L–1 . min–1, in 36%, both being associated with the type, location, and degree of obstruction (p < 0.05). There was concordance among the reviewers as to the presence of CAO. There is a relationship between the degree of obstruction and dyspnea. CONCLUSIONS: The quantitative criteria should always be calculated for flow-volume curves in order to detect CAO, because of the low sensitivity of the qualitative criteria. Both FEF50%/FIF50% ≥ 1 and FEV1/PEF ≥ 8 mL . L–1 . min–1 were associated with the location, type and degree of obstruction.

scholarly journals To the informative value of flow-volume curve in forced expiration

2008 ◽  
pp. 91-97 ◽  
Author(s):  
G. A. Lyubimov ◽  
I. M. Skobeleva ◽  
G. M. Sakharova ◽  
A. V. Suvorov
Keyword(s):  
Airway Resistance ◽  
Lung Compliance ◽  
Forced Expiration ◽  
Flow Volume ◽  
Functional Tests ◽  
Lung Volumes ◽  
Volume Curve ◽  
Quitting Smoking ◽  
Flow Volume Curve ◽  
Airway Walls

This report introduces a mathematical model of forced expiration to analyze pulmonary function. Results of 3-year lung function monitoring of an ex-smoker have been shown in the paper. Actual values of lung volumes and airway resistance were used for modeling. The computerized data were compared to the flow-volume curve parameters and lung volumes measured during the forced expiration. Weak correlation between the "flow-volume" curve parameters and the time after quitting smoking together with significant change in the lung volumes and the airway resistance seen in the study could be due to some processes which have not been followed in this study (lung compliance, airway resistance at forced expiration, and elastic properties of airway walls).The results demonstrated that mathematical models could increase informative value of pulmonary functional tests. In addition, the model could emphasize additional functional tests for better diagnostic usefulness of functional investigations.

scholarly journals Flow-volume curve in the diagnosis and follow-up of intrathoracic airway obstruction

2017 ◽  
Vol 59 (5) ◽  
pp. 594
Author(s):  
Özlem Cavkaytar ◽  
Ayşe Büyükçam ◽  
Özlem Tekşam ◽  
Deniz Doğru-Ersöz ◽  
Zuhal Akçören ◽  
...  
Keyword(s):  
Airway Obstruction ◽  
Flow Volume ◽  
Volume Curve ◽  
Flow Volume Curve

scholarly journals Airway obstruction is associated with reduced variability in specific parts of the tidal breathing flow–volume curve in young children

2019 ◽  
Vol 5 (2) ◽  
pp. 00028-2019 ◽  
Author(s):  
Ville-Pekka Seppä ◽  
Anton Hult ◽  
Javier Gracia-Tabuenca ◽  
Marita Paassilta ◽  
Jari Viik ◽  
...  
Keyword(s):  
Young Children ◽  
Airway Obstruction ◽  
Flow Volume ◽  
Tidal Breathing ◽  
Volume Curve ◽  
Flow Volume Curve

Physiologic Differentiation of Upper and Lower Airway Obstruction

1977 ◽  
Vol 86 (5) ◽  
pp. 630-632 ◽  
Author(s):  
Frank F. Davidson ◽  
George W. Burke
Keyword(s):  
Airway Obstruction ◽  
Upper Airway ◽  
Lower Airway ◽  
Flow Volume ◽  
Initial Part ◽  
Maximal Flow ◽  
Volume Curve ◽  
Flow Volume Curve ◽  
Lower Airways ◽  
Lower Airway Obstruction

Usual lower airway obstruction and fixed upper airway obstruction can be differentiated physiologically by means of the flow-volume curve. Normally, maximal flow decreases nearly linearly as lung volume decreases during expiration. In lower airway obstruction, this decrease is greatest at the beginning of expiration resulting in a curve that is concave upward. In fixed obstruction (stenosis) flow is constant throughout the initial part of forced maximal expiration and throughout virtually all of inspiration. This results in a plateau or flat curve which is characteristic and different from the curve in obstruction of lower airways. Cases in which this differentiation is clinically important are discussed.

scholarly journals Flow volume curve: A diagnostic tool in extrathoracic airway obstruction

2020 ◽  
Vol 36 (4) ◽  
Author(s):  
Thamir Al-Khlaiwi
Keyword(s):  
Airway Obstruction ◽  
Diagnostic Tool ◽  
Upper Airway ◽  
Lung Pathology ◽  
Flow Volume ◽  
Creative Commons ◽  
Flow Volume Loop ◽  
Volume Curve ◽  
Flow Volume Curve ◽  
Extrathoracic Airway

The flow-volume loop (F/V-loop) is a presentation of inhalation and exhalation of air stream volume during inspiration and expiration. It demonstrates the obstructive, restrictive and mixed pattern lung pathology. Flow-volume loop has been extensively used for evaluating the severity, progression and resolution of various causes of upper-airway conditions. doi: https://doi.org/10.12669/pjms.36.4.2283 How to cite this:Al-Khlaiwi T. Flow volume curve: A diagnostic tool in extrathoracic airway obstruction. Pak J Med Sci. 2020;36(4):---------.  doi: https://doi.org/10.12669/pjms.36.4.2283 This is an Open Access article distributed under the terms of the Creative Commons Attribution License (http://creativecommons.org/licenses/by/3.0), which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

Diagnosis of Major Airway Obstruction Using the Flow-volume Curve

1980 ◽  
Vol 31 (5) ◽  
pp. 355-365
Author(s):  
Nobuo Usui ◽  
Yoichi Ishizuka ◽  
Toshihiko Sato
Keyword(s):  
Airway Obstruction ◽  
Flow Volume ◽  
Volume Curve ◽  
Flow Volume Curve

scholarly journals Curvilinearity of a Maximum Expiratory Flow-Volume Curve: A Useful Indicator for Assessing Airway Obstruction in Children With Asthma

2019 ◽  
Vol 65 (4) ◽  
pp. 427-436 ◽  
Author(s):  
Yanli Zhang ◽  
Xiaorong Xiong ◽  
Fuli Dai ◽  
Aifang Su ◽  
Xiufang Wang ◽  
...  
Keyword(s):  
Airway Obstruction ◽  
Flow Volume ◽  
Volume Curve ◽  
Children With Asthma ◽  
Maximum Expiratory Flow ◽  
Flow Volume Curve ◽  
Expiratory Flow

Vascular ring presenting as asthma: The value of a flow-volume curve

1979 ◽  
Vol 94 (4) ◽  
pp. 610-611 ◽  
Author(s):  
Michael L. Loren ◽  
Richard L. Cooley ◽  
Candice Rohr ◽  
Richard O. Buck
Keyword(s):  
Vascular Ring ◽  
Flow Volume ◽  
Volume Curve ◽  
Flow Volume Curve

Severe Upper Airway Obstruction Caused by Bullous Pemphigoid: Diagnostic Usefulness of the Flow-Volume Curve

1982 ◽  
Vol 90 (1) ◽  
pp. 20-24 ◽  
Author(s):  
Carl Hallenborg ◽  
Lee D. Rowe ◽  
Cordon Gamsu ◽  
Homer A. Boushey ◽  
Jeffrey A. Golden
Keyword(s):  
Airway Obstruction ◽  
Bullous Pemphigoid ◽  
Upper Airway ◽  
Upper Airway Obstruction ◽  
Oxygen Mixture ◽  
Flow Volume ◽  
Axial Tomography ◽  
Volume Curve ◽  
Maximum Expiratory Flow ◽  
Flow Volume Curve

The site and severity of upper airway obstruction were accurately determined by analysis of the flow-volume curve obtained from a dyspneic patient with bullous pemphigoid. The limitation of maximum inspiratory flow to 0.5 L/s and of maximum expiratory flow to 0.7 L/s over most of the vital capacity suggested that the lumen of the extrathoracic trachea was narrowed to a diameter of 3 mm. The marked improvement in flow with the patient breathing a helium-oxygen mixture further confirmed that flow was limited in a large central airway. The predictions made from analysis of the flow-volume curve were confirmed by fiberoptic bronchoscopic examination and by computerized axial tomography, which revealed severe supraglottic obstruction. After a tracheostomy was performed, maximal inspiratory and expiratory flows were normal.

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