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Reference equations for peak nasal inspiratory flow in Portuguese adults

Ivânia Gonçalves, Ana Margarida Pereira, Tiago Jacinto, Luís Araújo, Mariana Couto, Ana Sá-Sousa, Helena Pité, Mário Morais-Almeida, João Fonseca
European Respiratory Journal 2015 46: PA946; DOI: 10.1183/13993003.congress-2015.PA946
Ivânia Gonçalves
1Allergy Unit, CUF Porto - Instituto & Hospital, Porto, Portugal
2CINTESIS - Center for Research in Health Technologies and Information Systems, Faculty of Medicine - University of Porto, Porto, Portugal
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Ana Margarida Pereira
1Allergy Unit, CUF Porto - Instituto & Hospital, Porto, Portugal
2CINTESIS - Center for Research in Health Technologies and Information Systems, Faculty of Medicine - University of Porto, Porto, Portugal
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Tiago Jacinto
1Allergy Unit, CUF Porto - Instituto & Hospital, Porto, Portugal
2CINTESIS - Center for Research in Health Technologies and Information Systems, Faculty of Medicine - University of Porto, Porto, Portugal
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Luís Araújo
1Allergy Unit, CUF Porto - Instituto & Hospital, Porto, Portugal
3Immunology Lab, Faculty of Medicine - University of Porto, Porto, Portugal
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Mariana Couto
1Allergy Unit, CUF Porto - Instituto & Hospital, Porto, Portugal
3Immunology Lab, Faculty of Medicine - University of Porto, Porto, Portugal
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Ana Sá-Sousa
2CINTESIS - Center for Research in Health Technologies and Information Systems, Faculty of Medicine - University of Porto, Porto, Portugal
5Department of Health Information and Decision Sciences, Faculty of Medicine - University of Porto, Porto, Portugal
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Helena Pité
4Immunoallergy Department, Hospital CUF Descobertas, Lisboa, Portugal
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Mário Morais-Almeida
4Immunoallergy Department, Hospital CUF Descobertas, Lisboa, Portugal
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João Fonseca
1Allergy Unit, CUF Porto - Instituto & Hospital, Porto, Portugal
2CINTESIS - Center for Research in Health Technologies and Information Systems, Faculty of Medicine - University of Porto, Porto, Portugal
5Department of Health Information and Decision Sciences, Faculty of Medicine - University of Porto, Porto, Portugal
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Abstract

Background: Peak Nasal Inspiratory Flow (PNIF) is a fast, simple and low-cost method to assess nasal patency. We aimed to (1)describe PNIF values in healthy Portuguese adults, (2)to assess which variables influence PNIF and (3)to compute a PNIF reference equation for this population.

Methods: From the population-based, nationwide, observational study ICAR - Control and Burden of Asthma and Rhinitis (clinical trials.gov NCT01771120), we included 104 nonsmoking adults (71% females) classified as healthy after medical evaluation, questionnaires and spirometry; and without previous nasal surgery, nasal polyps on anterior rhinoscopy or recent acute respiratory infectious disease. Five PNIF measurements were recorded for each subject and the highest was used in analysis. Univariate and multiple linear regression analyses were used to determine the reference equation.

Results: The mean (SD) age of the sample was 47(17) years. Overall, PNIF mean (SD) was 134(40) l/min; it was higher in men (152(44) l/min) compared to women (126(36) l/min; p=0.002).We observed positive significant correlations between PNIF and height (r= 0.33; p=0.001), FVC (r= 0.44; p < 0.001), FEV1(r= 0.47; p < 0.001) and a negative correlation with age (r= -0.32; p=0.001). In our population, the best reference equation (adjusted r2= 0.21) for PNIF (l/min) was 109.2 + 14.7& FEV1 – 0.27*Age – 12.2 Gender [0-male; 1-female]. When lung function is not available, an alternative reference equation (adjusted r2= 0.18) is 188.5-0.76*Age-26.4*Gender[0-male; 1-female].

Conclusion: The reference equation for PNIF in healthy subjects that included FEV1, age and gender had the highest explained percentage of PNIF variability.

  • Lung function testing
  • Physiology
  • Copyright ©ERS 2015
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Reference equations for peak nasal inspiratory flow in Portuguese adults
Ivânia Gonçalves, Ana Margarida Pereira, Tiago Jacinto, Luís Araújo, Mariana Couto, Ana Sá-Sousa, Helena Pité, Mário Morais-Almeida, João Fonseca
European Respiratory Journal Sep 2015, 46 (suppl 59) PA946; DOI: 10.1183/13993003.congress-2015.PA946

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Reference equations for peak nasal inspiratory flow in Portuguese adults
Ivânia Gonçalves, Ana Margarida Pereira, Tiago Jacinto, Luís Araújo, Mariana Couto, Ana Sá-Sousa, Helena Pité, Mário Morais-Almeida, João Fonseca
European Respiratory Journal Sep 2015, 46 (suppl 59) PA946; DOI: 10.1183/13993003.congress-2015.PA946
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