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Titolo:
Assessing the reversibility of airway obstruction
Autore:
Pellegrino, R; Rodarte, JR; Brusasco, V;
Indirizzi:
Univ32enoa, Fac Med & Chirurg, Dipartimento Sci Motorie & Riabilitat, I-161 Univ Genoa Genoa Italy I-16132 artimento Sci Motorie & Riabilitat, I-161 Azienda Osped S Croce & Carle, Serv Fisiopatol Resp, Cuneo, Italy Azienda Osped S Croce & Carle Cuneo Italy Fisiopatol Resp, Cuneo, Italy Baylor Coll Med, Pulm Sect, Houston, TX 77030 USA Baylor Coll Med HoustonTX USA 77030 ed, Pulm Sect, Houston, TX 77030 USA
Titolo Testata:
CHEST
fascicolo: 6, volume: 114, anno: 1998,
pagine: 1607 - 1612
SICI:
0012-3692(199812)114:6<1607:ATROAO>2.0.ZU;2-L
Fonte:
ISI
Lingua:
ENG
Soggetto:
FLOW-VOLUME CURVES; INDUCED BRONCHOCONSTRICTION; BRONCHODILATOR RESPONSE; CYSTIC-FIBROSIS; HYPERINFLATION; VARIABILITY; LIMITATION; HYSTERESIS; DISEASE;
Keywords:
asthma; COPD; FEV1; functional residual capacity; inspiratory capacity; partial and maximal flow-volume curves;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Clinical Medicine
Life Sciences
Citazioni:
28
Recensione:
Indirizzi per estratti:
Indirizzo: Brusasco, V Univ Genoa, Fac Med & Chirurg, Dipartimento Sci Motorie & Riabilitat, Largo Univ Genoa Largo R Benzi 10 Genoa Italy I-16132 ilitat, Largo
Citazione:
R. Pellegrino et al., "Assessing the reversibility of airway obstruction", CHEST, 114(6), 1998, pp. 1607-1612

Abstract

Study objective: To determine whether changes of partial expiratory flow-volume curve (PEFV) and inspiratory capacity (IC) detect functional responses to bronchodilator in patients who do not meet the FEV1 criteria for reversibility of airway obstruction,Design/methods: The effects of salbutamol (200 mu g by metered-dose inhaler) on lung function were examined in 50 patients with asthma and 28 patients with COPD, Measurements evaluated were FEV1, forced expiratory flow at 30% of control FVC from maximal expiratory flow-volume curve ((V)over dot m30), forced expiratory flow at 30% of control FVC from PEFV ((V)over dot p30), and IC, On a separate occasion, a representative sample of 26 subjects inhaled placebo to determine the 95% confidence limits (CLs) of each of the parameters. Results: A percent and absolute increment of FEV1 above the upper CL was recorded in 28 patients, Of these, 26 had a percent and absolute increase of(V)over dot p30, 21 of (V)over dot m30, 9 of FVC, and 11 of IC above the 95% CL, Of the 50 patients who did not have an increase in FEV1 above the 95% CL, 25 had a per cent and absolute increase in Vp30, 15 of (V)over dot m30, 3 of FVC, and 13 of IC above the 95% CL, On average, the percent and absolute increase (V)over dot p30 above the 95% CL significantly identified more responders than every other parameter,Conclusion: Increases in maximal flow detected by PEFV and/or changes in IC may be substantially obscured by the effects of inspiration to total lungcapacity required for the measurement of FEV1 in patients with chronic bronchoconstriction. Decreases in functional residual capacity (FRC) manifested by an increase of IC occur because, in patients whose FRC is dynamically determined, bronchodilatation that increases maximal flow in the tidal breathing range allows patients to breathe at lower lung volumes. Changes of FEV1 frequently fail to detect. significant functional response to bronchodilators in patients with chronic airflow obstruction.

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 19/09/20 alle ore 09:25:42