TY - JOUR
T1 - Flujometría versus espirometría para el diagnóstico de asma en adultos
AU - Herrera-Sánchez, Andrea
AU - Álvarez-Chávez, Fabián Eduardo
AU - Castillo-Hernández, María C.
AU - Orihuela, Óscar
AU - Guevara-Balcázar, Gustavo
AU - Martínez-Godínez, María de los Ángeles
AU - González-Virla, Baldomero
N1 - Publisher Copyright:
© 2019 Nieto Editores. All rights reserved.
PY - 2019
Y1 - 2019
N2 - Background: The diagnosis of asthma is confirmed with a spirometry: FEV1 ratio (forced expiratory volume in one second)/FVC (forced vital capacity) <80% with reversibility (FEV1 >12% or 200 mL) after using salbutamol. The peak expiratory flow is cheap and easy to use; it measures the forced expiratory flow, of which reversibility > 20% suggests asthma. Objective: To know the sensitivity, specificity, and the positive and negative predictive values of the flowmeter. Methods: A cross-sectional, observational, comparative study. Individuals aged >18 years without contraindications for spirometry were included. They underwent spirometry and peak expiratory flow, and the ACT (Asthma Control Test) questionnaire was applied to them. Sensitivity, specificity, positive predictive value and negative predictive value of the flowmetry were calculated. ROC curve was carried out in order to know the cut-off point of greater sensitivity and specificity. Results: Of 150 patients, 66% were male; the median age was 38 years. According to the guidelines of GINA 2018 (Global Initiative for Asthma); 58.7% were controlled. The sensitivity of the peak expiratory flow was 47%, and the specificity was 87%, with a positive predictive value of 54.8% and a negative predictive value of 84%. The peak expiratory flow showed higher specificity with FEV1 <59%. The cut-off point of greater sensitivity and specificity was a reversibility of 8%, with an area under the curve of 0.70. Conclusions: The flowmeter has got greater sensitivity in airway obstructions; it is useful when a spirometer is not available.
AB - Background: The diagnosis of asthma is confirmed with a spirometry: FEV1 ratio (forced expiratory volume in one second)/FVC (forced vital capacity) <80% with reversibility (FEV1 >12% or 200 mL) after using salbutamol. The peak expiratory flow is cheap and easy to use; it measures the forced expiratory flow, of which reversibility > 20% suggests asthma. Objective: To know the sensitivity, specificity, and the positive and negative predictive values of the flowmeter. Methods: A cross-sectional, observational, comparative study. Individuals aged >18 years without contraindications for spirometry were included. They underwent spirometry and peak expiratory flow, and the ACT (Asthma Control Test) questionnaire was applied to them. Sensitivity, specificity, positive predictive value and negative predictive value of the flowmetry were calculated. ROC curve was carried out in order to know the cut-off point of greater sensitivity and specificity. Results: Of 150 patients, 66% were male; the median age was 38 years. According to the guidelines of GINA 2018 (Global Initiative for Asthma); 58.7% were controlled. The sensitivity of the peak expiratory flow was 47%, and the specificity was 87%, with a positive predictive value of 54.8% and a negative predictive value of 84%. The peak expiratory flow showed higher specificity with FEV1 <59%. The cut-off point of greater sensitivity and specificity was a reversibility of 8%, with an area under the curve of 0.70. Conclusions: The flowmeter has got greater sensitivity in airway obstructions; it is useful when a spirometer is not available.
KW - Asthma
KW - Peak expiratory flow
KW - Spirometry
UR - http://www.scopus.com/inward/record.url?scp=85073169496&partnerID=8YFLogxK
U2 - 10.29262/ram.v66i3.630
DO - 10.29262/ram.v66i3.630
M3 - Artículo
C2 - 31606014
AN - SCOPUS:85073169496
SN - 0002-5151
VL - 66
SP - 308
EP - 313
JO - Revista Alergia Mexico
JF - Revista Alergia Mexico
IS - 3
ER -