PT  - JOURNAL ARTICLE
AU  - Pérez-Padilla, Rogelio
AU  - Vázquez-García, Juan Carlos
AU  - Márquez, María Nelly
AU  - Jardim, José Roberto B
AU  - Pertuzé, Julio
AU  - Lisboa, Carmen
AU  - Muiño, Adriana
AU  - López, María Victorina
AU  - Tálamo, Carlos
AU  - de Oca, María Montes
AU  - Valdivia, Gonzalo
AU  - Menezes, Ana Maria B
AU - the Latin American COPD Prevalence Study (PLATINO) Team
TI  - The Long-Term Stability of Portable Spirometers Used in a Multinational Study of the Prevalence of Chronic Obstructive Pulmonary Disease
DP  - 2006 Oct 01
TA  - Respiratory Care
PG  - 1167--1171
VI  - 51
IP  - 10
4099  - http://rc.rcjournal.com/content/51/10/1167.short
4100  - http://rc.rcjournal.com/content/51/10/1167.full
AB  - BACKGROUND: We report the performance of an ultrasound-based portable spirometer (EasyOne) used in a population-based survey of the prevalence of chronic obstructive pulmonary disease, conducted in 5 Latin American cities: São Paulo, Brazil; México City, México; Montevideo, Uruguay; Santiago, Chile; and Caracas, Venezuela (the Latin American COPD Prevalence Study [PLATINO]). METHODS: During the survey period (which ranged from 3 months to 6 months in the various locations) we collected daily calibration data from the 70 EasyOne spirometers used in the 5 survey cities. The calibrations were conducted with a 3-L syringe, and the calibration data were stored in the spirometer's database. RESULTS: Ninety-seven percent of the calibration volumes were within ± 64 mL (2.1%) of the 3-L calibration signal. Excluding data from the first city studied (São Paulo), where one calibration syringe had to be replaced, 98% of the calibration checks were within ± 50 mL (1.7%). The measured volume was affected only minimally by the syringe's peak flow or emptying time. CONCLUSION: In these 70 EasyOne spirometers neither calibration nor linearity changed during the study. Such calibration stability is a valuable feature in spirometry surveys and in the clinical setting.