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Reference values for forced inspiratory flows in children aged 7-15 years

Waldemar Tomalak1, Jakub Radliński, Andrzej Pogorzelski

  • 1National Research Institute for Tuberculosis and Lung Diseases, Rabka Branch, Rabka, Poland. wtomalak@zpigichp.edu.pl

Pediatric Pulmonology
|July 27, 2004
PubMed

Insights

This study established reference equations for peak inspiratory flow (PIF) and maximal inspiratory flow at 50% of FVC (MIF50%FVC) in children. Height and sex were found to be the key predictors of these important respiratory measurements.

Area of Science:

  • Pediatric Pulmonology
  • Respiratory Physiology
  • Biometry

Background:

  • Establishing normative data for respiratory function in children is crucial for accurate diagnosis and management.
  • Forced inspiratory flows are less studied compared to expiratory flows in pediatric populations.
  • Accurate reference equations are needed for assessing inspiratory capacity and identifying potential respiratory issues.

Purpose of the Study:

  • To measure and establish reference equations for peak inspiratory flow (PIF) and maximal inspiratory flow at 50% of FVC (MIF50%FVC) in healthy schoolchildren.
  • To identify predictive variables for forced inspiratory flows in children.
  • To provide a basis for clinical applications in pediatric respiratory assessment.

Main Methods:

  • Flow-volume loop measurements were performed on 332 healthy schoolchildren aged 7-15 years using an electronic spirometer.
  • Data from 255 children with satisfactory measurements were statistically analyzed.
  • A power model (Y = A * H(B)) was used to determine the best fit for the relationship between inspiratory flows and height.

Main Results:

  • Sex and height were identified as the sole significant predictive variables for forced inspiratory flows.
  • Coefficients of correlation between height and inspiratory flows ranged from 0.66-0.77, with slightly higher correlations observed in boys.
  • Forced inspiratory flows demonstrated a positive correlation with height and exhibited greater variability than forced expiratory flows.

Conclusions:

  • Reference values for forced inspiratory flows in children are height and sex-dependent.
  • These reference values can aid in selecting appropriate inhalation devices for children.
  • The findings support the use of forced inspiratory flow measurements in diagnosing conditions like extrathoracic airway obstruction in pediatric patients.

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