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Peak nasal inspiratory flow measurement: an investigation in children
1Department of Otolaryngology, University of Cape Town, Red Cross War Memorial Children's Hospital, South Africa.
Insights
Peak nasal inspiratory flow (PNIF) offers a way to objectively assess nasal airway obstruction in children. This study provides normative data for children up to 8 years old, showing a linear increase in PNIF with age.
Area of Science:
- Pediatric Otolaryngology
- Respiratory Physiology
- Diagnostic Methods in Children
Background:
- Nasal airway obstruction is a common issue in pediatric patients.
- Objective assessment tools for nasal obstruction are needed.
- Peak nasal inspiratory flow (PNIF) is a potential non-invasive measure.
Purpose of the Study:
- To establish normative data for peak nasal inspiratory flow (PNIF) in children up to 8 years of age.
- To evaluate the relationship between PNIF and age, height, and weight in children.
- To assess the potential utility and limitations of PNIF for evaluating nasal airway obstruction in pediatric populations.
Main Methods:
- Cross-sectional study design.
- Measurement of peak nasal inspiratory flow (PNIF) in a cohort of children up to 8 years old.
- Analysis of PNIF values in relation to age, height, and weight.
Main Results:
- PNIF demonstrated a linear increase from infancy (mean 30 L/min) to 8 years (mean 80 L/min), with a noted dip at 3 years.
- A reasonably linear correlation was observed between PNIF and increasing height and weight.
- Variability in results was influenced by child cooperation and observer subjectivity.
Conclusions:
- Normative data for PNIF in children up to 8 years have been established.
- PNIF shows potential as an objective measure for pediatric nasal airway obstruction.
- Challenges related to child cooperation and observer interpretation may limit its routine clinical application.
Abstract:
Theoretically measurement of peak nasal inspiratory flow (PNIF) has promise as a method to objectively evaluate children with nasal airway obstruction. This study establishes normative data for children up to 8 years of age. PNIF increases linearly from a mean value of 30 l/min in early infancy up to a mean value of 80 l/min at age 8 years, apart from a dip at 3 years. There is a reasonably linear incremental rise with increasing height and weight. However, since results depend on both the degree of co-operation of the child and on the subjective impression of the observer as to when a maximal inspiratory effort has been made, there may be drawbacks to its use as a routine clinical method of nasal airway obstruction assessment.