Impulse Oscillometric Measurements
Airway resistance measurements were performed with the Jager MasterScreen-IOS system (Jaeger Co, Wurzberg, Germany). The patients were seated and rested 15 minutes before the test. They were told to hold the mouthpiece between their teeth and seal their lips around it tightly. Then they breathed calmly through the mouthpiece and bacterial filter attached to the pneumotograph. Measurements were made while the patients were in a sitting position, necks slightly extended. The subjects wore a nose clip and their cheeks were supported by the parents. Several breathing cycles that lasted for at least 30 seconds were recorded11. Three acceptable measurements were obtained for each subject and the mean of the values were taken.
Airway resistance (R / resistance) and elasticity capacity (X / reactance) are are measured at difference frequencies and resistance (R5, R10, R15) and reactance (X5, X10, X15) values were recorded at frequencies of 5,10,15 and 20 Hz.