Show simple item record Lázár, Zsófia Horváth, Péter Puskás, Rita Gálffy, Gabriella Losonczy, György Horváth, Ildikó Bikov, András 2021-10-13T13:24:23Z 2021-10-13T13:24:23Z 2018
dc.identifier 85049839014
dc.identifier.citation journalVolume=56;journalIssueNumber=6;journalTitle=JOURNAL OF ASTHMA;pagerange=584-593;journalAbbreviatedTitle=J ASTHMA;
dc.identifier.uri doi:10.1080/02770903.2018.1477957
dc.description.abstract OBJECTIVE: Extended nitric oxide (NO) analysis offers the partitioned monitoring of inflammation in central and peripheral airways. Different mathematical models are used to estimate pulmonary NO dynamics in asthma with variable results and limitations. We aimed to establish a protocol for extended NO analysis in patients with differing asthma severity. METHODS: Forty patients with stable asthma and twenty-five matched control subjects were recruited. Exhaled NO was measured at constant flow rates between 10 and 300 mL/s. Twelve controls performed NO measurements weekly for four weeks. RESULTS: The proportions of patients with technically acceptable measurements at 10-30-50-100-150-200-250-300 mL/s exhalation flow rates were 8-58-100-98-98-95-90-80%, respectively. Alveolar NO (CANO) and total flux of NO in the conducting airways (JawNO) were calculated with the linear method from NO values measured at 100-150-200-250 mL/s exhalation flows. The mean intra-subject bias for JawNO and CANO in controls was 0.16 nL/s and 0.85 ppb, respectively. Both JawNO (1.31 /0.83-2.97/ vs. 0.70 /0.54-0.87/ nL/s, p<0.001) and CANO (4.08 /2.63-7.16/ vs. 2.42 /1.83-2.89/ ppb, p<0.001) were increased in patients with asthma compared to controls. In patients, CANO correlated with RV/TLC (r = 0.58, p<0.001), FEF25-75% (p = 0.02, r = -0.36) and DL,CO (r = -0.46, p = 0.004). JawNO was not related to lung function parameters. CONCLUSIONS: Calculation of alveolar NO concentration with the linear method from values obtained at medium flow rates (100-250 mL/s) is feasible even in asthmatic patients with severe airflow limitation and may provide information on small airways dysfunction in asthma.
dc.relation.ispartof urn:issn:0277-0903
dc.title A suitable protocol for measuring alveolar nitric oxide in asthma with differing severity to assess peripheral airways inflammation
dc.type Journal Article 2019-09-12T16:24:52Z
dc.language.rfc3066 en
dc.rights.holder NULL
dc.identifier.mtmt 3388670
dc.identifier.pubmed 29923757
dc.contributor.department SE/AOK/K/Pulmonológiai Klinika
dc.contributor.institution Semmelweis Egyetem

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