AGE DYNAMICS OF ELECTRIC IMPEDANCE SPIROMETRY INDICES in children aged 3–16
Aim. To study the age peculiarities of electric impedance spirometry indices in children aged 3 to 16 years. Materials and methods. 58 patients were divided into 3 age groups and examined: group 1 – aged 3 to 7years, group 2 – aged 8 to 11, group 3 – aged 12 to15. Patients underwent spirometry tests and impedance spirometry by the author’s method (Mishlanov V.Yu., 2011) using netbook “BIA-lab Spiro” and ultrasonic inhaler Musson-3. The method of bipolar impedancemetry consists in registration of modular impedance value (Z) and phase angle (φ) on the frequencies 20, 98, 1000, 5000, 10000 and 20000 Hz of a low power alternating electric current during inhalation of 0,9% sodium chloride solution. Results. It was established that the group of children aged 4–7 had the lowest values of modular impedance value (Z) on all the frequency ranges. Reliable correlation between spirometry indices and electric impedance spirometry were fixed. Correlation dependence of modular electric impedance value (Z) on children’s age, height and weight was detected. Conclusion. Modular electric impedance value (Z) depends on the age, height and weight. Prospects for applying the method of electric impedance spirometry so as to study the functions of external respiration in pediatric practice were determined.