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  • Title: The peak flow nasal patency index.
    Author: Larsen K, Kristensen S.
    Journal: Ear Nose Throat J; 1992 Jan; 71(1):23-5. PubMed ID: 1576971.
    Abstract:
    The peak flow nasal patency index (NPI) is the ratio between the nasal and oral peak airflow. This index was found to be a good indicator of nasal patency present in 24 patients following septoplasty and indicated significant improvement postoperatively. The peak flow nasal patency index was also correlated to self-assessment scores of nasal function in each patient. In this latter study, a low index correlated to a high self-assessment score, both of which indicated poor nasal patency. Our studies have shown that the peak flow nasal patency index is a useful measure for determining nasal patency, particularly for defining the results of any applied therapies.
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