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Efficient screening for COPD using three steps: a cross-sectional study in Mexico City.

Franco-Marina F, Fernandez-Plata R, Torre-Bouscoulet L, García-Sancho C, Sanchez-Gallen E, Martinez D, Perez-Padilla R, Study Te - NPJ Prim Care Respir Med (2014)

Bottom Line: Underdiagnosis of chronic obstructive pulmonary disease (COPD) in primary care can be improved by a more efficient screening strategy.We analysed two related Mexico City cross-sectional samples.A three-step screening strategy for COPD substantially reduces the need for spirometry testing when only a COPD scale is used for screening.

View Article: PubMed Central - PubMed

Affiliation: Department of Epidemiology, National Institute of Respiratory Diseases, Mexico City, Mexico.

ABSTRACT

Background: Underdiagnosis of chronic obstructive pulmonary disease (COPD) in primary care can be improved by a more efficient screening strategy.

Aims: To evaluate a three-step method of screening for COPD consisting of an initial short questionnaire followed by measurement of forced expiratory volume in 1s/forced expiratory volume in 6s (FEV1/FEV6) using an inexpensive pocket spirometer in those with high risk, and diagnostic quality spirometry in those with a low FEV1/FEV6.

Methods: We analysed two related Mexico City cross-sectional samples. The 2003 Mexico City PLATINO survey (n=542) was used to develop a short questionnaire to determine the risk of COPD and a 2010 survey (n=737) additionally used a pocket spirometer. The discriminatory power of the two instruments was assessed with receiver operator characteristic (ROC) curves using three COPD definitions.

Results: The developed COPD scale included two variables from a simple questionnaire and, in ROC analysis, an area under the curve (AUC) between 0.64 and 0.77 was found to detect COPD. The pocket spirometer had an AUC between 0.85 and 0.88 to detect COPD. Using the COPD scale as a first screening step excluded 35-48% of the total population from further testing at the cost of not detecting 8-18% of those with COPD. Using the pocket spirometer and sending those with a FEV1/FEV6<0.80 for diagnostic quality spirometry is very efficient, and substantially improved the positive predictive value at the cost of not detecting one-third of COPD cases.

Conclusions: A three-step screening strategy for COPD substantially reduces the need for spirometry testing when only a COPD scale is used for screening.

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Related in: MedlinePlus

Venn diagram showing the analysed Mexico City samples.
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fig1: Venn diagram showing the analysed Mexico City samples.

Mentions: The results presented here do not consider either the type of spirometer used or the order in which the 6-second spirometry and diagnostic quality spirometry tests were performed since these two factors had only a marginal influence on our results. The 2003 Mexico City database contained information on 956 participants aged ⩾40 years with complete information on key variables (Figure 1). Of these, 542 were not included in the 2010 survey and constitute the training sample in which we developed the COPD scale.


Efficient screening for COPD using three steps: a cross-sectional study in Mexico City.

Franco-Marina F, Fernandez-Plata R, Torre-Bouscoulet L, García-Sancho C, Sanchez-Gallen E, Martinez D, Perez-Padilla R, Study Te - NPJ Prim Care Respir Med (2014)

Venn diagram showing the analysed Mexico City samples.
© Copyright Policy - open-access
Related In: Results  -  Collection

License
Show All Figures
getmorefigures.php?uid=PMC4373258&req=5

fig1: Venn diagram showing the analysed Mexico City samples.
Mentions: The results presented here do not consider either the type of spirometer used or the order in which the 6-second spirometry and diagnostic quality spirometry tests were performed since these two factors had only a marginal influence on our results. The 2003 Mexico City database contained information on 956 participants aged ⩾40 years with complete information on key variables (Figure 1). Of these, 542 were not included in the 2010 survey and constitute the training sample in which we developed the COPD scale.

Bottom Line: Underdiagnosis of chronic obstructive pulmonary disease (COPD) in primary care can be improved by a more efficient screening strategy.We analysed two related Mexico City cross-sectional samples.A three-step screening strategy for COPD substantially reduces the need for spirometry testing when only a COPD scale is used for screening.

View Article: PubMed Central - PubMed

Affiliation: Department of Epidemiology, National Institute of Respiratory Diseases, Mexico City, Mexico.

ABSTRACT

Background: Underdiagnosis of chronic obstructive pulmonary disease (COPD) in primary care can be improved by a more efficient screening strategy.

Aims: To evaluate a three-step method of screening for COPD consisting of an initial short questionnaire followed by measurement of forced expiratory volume in 1s/forced expiratory volume in 6s (FEV1/FEV6) using an inexpensive pocket spirometer in those with high risk, and diagnostic quality spirometry in those with a low FEV1/FEV6.

Methods: We analysed two related Mexico City cross-sectional samples. The 2003 Mexico City PLATINO survey (n=542) was used to develop a short questionnaire to determine the risk of COPD and a 2010 survey (n=737) additionally used a pocket spirometer. The discriminatory power of the two instruments was assessed with receiver operator characteristic (ROC) curves using three COPD definitions.

Results: The developed COPD scale included two variables from a simple questionnaire and, in ROC analysis, an area under the curve (AUC) between 0.64 and 0.77 was found to detect COPD. The pocket spirometer had an AUC between 0.85 and 0.88 to detect COPD. Using the COPD scale as a first screening step excluded 35-48% of the total population from further testing at the cost of not detecting 8-18% of those with COPD. Using the pocket spirometer and sending those with a FEV1/FEV6<0.80 for diagnostic quality spirometry is very efficient, and substantially improved the positive predictive value at the cost of not detecting one-third of COPD cases.

Conclusions: A three-step screening strategy for COPD substantially reduces the need for spirometry testing when only a COPD scale is used for screening.

Show MeSH
Related in: MedlinePlus