Assessing the exacerbations risk of influenza-associated chronic occupational asthma.
The purpose of this article was to conduct a risk-based study based on a linkage of experimental human influenza infections and fluctuation analysis of airway function to assess whether influenza viral infection was risk factor for exacerbations of chronic occupational asthma. Here we provided a comprehensive probabilistic analysis aimed at quantifying influenza-associated exacerbations risk for occupational asthmatics, based on a combination of published distributions of viral shedding and symptoms scores and lung respiratory system properties characterized by long-range peak expiratory flow (PEF) dynamics. Using a coupled detrended fluctuation analysis-experimental human influenza approach, we estimated the conditional probability of moderate or severe lung airway obstruction and hence the exacerbations risk of influenza-associated occupational asthma in individuals. The long-range correlation exponent (alpha) was used as a predictor of future exacerbations risk of influenza-associated asthma. For our illustrative distribution of PEF fluctuations and influenza-induced asthma exacerbations risk relations, we found that the probability of exacerbations risk can be limited to below 50% by keeping alpha to below 0.53. This study also found that limiting wheeze scores to 0.56 yields a 75% probability of influenza-associated asthma exacerbations risk and a limit of 0.34 yields a 50% probability that may give a representative estimate of the distribution of chronic respiratory system properties. This study implicates that influenza viral infection is an important risk factor for exacerbations of chronic occupational asthma.
Liao
Chung-Min
CM
Department of Bioenvironmental Systems Engineering, National Taiwan University, Taipei, Taiwan 10617, ROC. cmliao@ntu.edu.tw
Hsieh
Nan-Hung
NH
Chio
Chia-Pin
CP
Chen
Szu-Chieh
SC
D000465:Algorithms; D001249:Asthma / Q000209:etiology* / Q000503:physiopathology; D002908:Chronic Disease; D016208:Databases, Factual; D005541:Forced Expiratory Volume; D006801:Humans; D007251:Influenza, Human / Q000150:complications* / Q000503:physiopathology; D015233:Models, Statistical; D009784:Occupational Diseases / Q000209:etiology* / Q000503:physiopathology; D010366:Peak Expiratory Flow Rate; D012307:Risk Factors; D035501:Uncertainty
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