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Titolo:
Airway responsiveness as a direct factor contributing to the dyspnoea perception in asthma
Autore:
Koh, YI; Choi, IS; Lim, H;
Indirizzi:
Chonnam Natl Univ, Dept Internal Med, Div Allergy, Sch Med,Dong Ku, Kwangju 501757, South Korea Chonnam Natl Univ Kwangju South Korea 501757 Kwangju 501757, South Korea Res Inst Med Sci, Kwangju, South Korea Res Inst Med Sci Kwangju South Korea Inst Med Sci, Kwangju, South Korea
Titolo Testata:
RESPIRATORY MEDICINE
fascicolo: 6, volume: 95, anno: 2001,
pagine: 464 - 470
SICI:
0954-6111(200106)95:6<464:ARAADF>2.0.ZU;2-I
Fonte:
ISI
Lingua:
ENG
Soggetto:
BRONCHIAL RESPONSIVENESS; INHALED HISTAMINE; LUNG-FUNCTION; BRONCHOCONSTRICTION; EXERCISE; HYPERRESPONSIVENESS; METHACHOLINE; OBSTRUCTION; SYMPTOMS; ALLERGEN;
Keywords:
perception; dyspnoea; asthma; airways responsiveness;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Clinical Medicine
Life Sciences
Citazioni:
24
Recensione:
Indirizzi per estratti:
Indirizzo: Choi, IS Chonnam Natl Univ, Dept Internal Med, Div Allergy, Sch Med,Dong Ku, 8 Hak Dong, Kwangju 501757, South Korea Chonnam Natl Univ 8 Hak Dong Kwangju South Korea 501757 th Korea
Citazione:
Y.I. Koh et al., "Airway responsiveness as a direct factor contributing to the dyspnoea perception in asthma", RESP MED, 95(6), 2001, pp. 464-470

Abstract

It is not clear whether airway responsiveness is directly related to the perception of bronchoconstriction in asthma. The purpose of this study is todirectly compare the perception of induced bronchoconstriction among the groups classified according to the degree of airway responsiveness. Two hundred and twenty-seven patients with the definitive or suspected asthma underwent a methacholine provocation test. During the test, the degree of dyspnoea was assessed by a modified Borg scale. The perception of induced bronchoconstriction was indicated by the slope in the linear regression analysis between changes in Borg score and the reduction in forced expiratory volume in I sec (FEV1) as a percentage of baseline value. The provocative concentration of methacholine resulting in 70% fall in FEV1 (PC20) was calculated. The degree of airway responsiveness to methacholine was categorized as moderate to severe airway hyper-responsiveness (AHR) if PC20 was < 1 mg ml(-1),mild AHR if PC20 was greater than or equal to1 but less than or equal to4 mg ml(-1), borderline AHR if PC20 was >4 but less than or equal to 16 mg ml(-1), and normal airway responsiveness (negative AHR) if PC20 was > 16 mg ml(-1). Positive AHR was defined as PC20 less than or equal to 4mg ml(-1). Another index of bronchial responsiveness (BR index) was calculated as the log [(% decline in FEV1/log final methacholine concentration as mg dl(-1))+10]. We found that the geometric mean of the slope was lower in subjects with positive AHR (0.12, n=115) than in subjects with negative AHR (0.17, n=72; P <0.01). The geometric mean of the slope in subjects with borderline AHR(0.14, n =40) was between the two groups. Furthermore, the slope was decreased in asthmatics with moderate to severe AHR compared with mild AHR (P <0.05), although the baseline FEV1 did not differ between the two groups. In multiple regression analysis, airway responsiveness expressed as BR index had a significant effect on the perception of bronchoconstriction. We conclude that the perception of bronchoconstriction is diminished in patients with AHR and the degree of airway responsiveness may be directly related to the perception of bronchoconstriction in asthmatic subjects.

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Documento generato il 31/03/20 alle ore 15:20:03