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* From the Departments of Pulmonology (Dr. Postma) and Epidemiology and Statistics (Dr. Boezen), University of Groningen, the Netherlands.
Correspondence to: Dirkje S. Postma, MD, PhD, Department of Pulmonology, University Hospital, University of Groningen, Postbus 30001, Hanseplein 1, 9700 RB Groningen, the Netherlands
The Dutch hypothesis, formulated in the 1960s, holds that the various forms of airway obstruction are different expressions of a single disease entity. It suggests that genetic factors (eg, airway hyperresponsiveness [AHR] and atopy), endogenous factors (eg, sex and age), and exogenous factors (eg, allergens, infections, and smoking) all play a role in the pathogenesis of chronic nonspecific lung disease. This review finds evidence that AHR and smoking are common risk factors for asthma and COPD. To prove the Dutch hypothesis definitively, however, genetic studies, preferably longitudinal, must be performed. Such studies must include subjects who have airway obstruction that does not necessarily meet the current strict definitions of asthma or COPD (ie, the extremes of these conditions) that are used in clinical studies.
Key Words: airway hyperresponsiveness asthma atopy chronic bronchitis COPD Dutch hypothesis emphysema pathogenesis smoking
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