title: PIKO-6® vs. forced spirometry in asthmatic children.
abstract: BACKGROUND
  The PIKO-6® is an electronic device that measures forced expiratory volume at seconds 1 (FEV1) and 6 (FEV6) of a forced vital capacity (FVC) maneuver. This device could aid in diagnosing obstructive respiratory diseases.
  
  
  OBJECTIVE
  To determine the concordance of FEV1, FEV6, and the FEV1/FEV6 quotient achieved with PIKO-6® versus spirometric values from asthmatic patients, and compare results with measures from healthy children.
  
  
  METHODS
  A cross-sectional study with asthmatic and healthy 6-to-14-year-old children, all of whom performed a forced spirometry as well as a PIKO-6® test.
  
  
  RESULTS
  The study included 82 subjects (58 asthmatics, 24 healthy children). Except for the functional parameters, the basal characteristics of the two groups were similar. The concordance correlation coefficient (CCC) for FEV1 was 0.938 (P < 0.001), with 95% limits of agreement of -0.591 to 0.512 L, and an average of differences of -0.040 L. For FEV6, CCC was 0.927 (P < 0.001), and the 95% limits of agreement were -0.751 to 0.598 L with an average of differences of -0.077 L. The concordance analysis and the FEV1 and FEV6 associations were better in children with controlled asthma and healthy subjects, as well as in the post-bronchodilator results.
  
  
  CONCLUSIONS
  The concordance between PIKO-6® and spirometry was lower in patients with partially controlled or uncontrolled asthma compared to controlled or healthy children. The broad limits of agreement show that the FEV1, FEV6, and FEV1/FEV6 obtained with the PIKO-6® are not interchangeable with spirometry results. Longitudinal evaluations of asthma patients are necessary to assess the utility of PIKO-6®.
authors: Departamento de Fisiología Respiratoria, Instituto Nacional de Enfermedades Respiratorias "Ismael Cosío Villegas,", México, Distrito Federal, Mexico.
authors: Laura
authors: L
authors: Gochicoa-Rangel
authors: Pablo José
authors: PJ
authors: Larios-Castañeda
authors: José Luis
authors: JL
authors: Miguel-Reyes
authors: David Martínez
authors: DM
authors: Briseño
authors: Roberto
authors: R
authors: Flores-Campos
authors: Juan Arturo
authors: JA
authors: Sáenz-López
authors: Luis
authors: L
authors: Torre-Bouscoulet
mesh_terms: D001249:Asthma / Q000503:physiopathology*; D016022:Case-Control Studies; D002648:Child; D003430:Cross-Sectional Studies; D005260:Female; D005541:Forced Expiratory Volume / Q000502:physiology*; D006801:Humans; D008297:Male; D015203:Reproducibility of Results; D013147:Spirometry / Q000295:instrumentation* / Q000379:methods; D014797:Vital Capacity / Q000502:physiology
keywords: FEV1; FEV6; FVC; PIKO-6®; asthmatic children; peak flow; spirometry