Two Models of High Frequency Chest Compression Therapy: Interaction of Jacket Pressure and Mouth Airflow

High frequency chest compression (HFCC) therapy assists clearing the secretions in the lung. This paper presents two mathematical models: 1) HFCC jacket function model (JFM) and 2) respiratory function model (RFM). JFM predicts the variation of the jacket pressure (P_j) from the respiratory pattern of mouth airflow (F_m). RFM predicts the HFCC induced mouth airflow (F_m) from the HFCC pulse pressures at the jacket (P_j). F_m and P_j were measured from a healthy subject during HFCC therapy. JFM, which was implemented with 2^nd order system using prediction error method, shows the existence of breathing pattern at P_j. RFM, which was implemented with amplitude modulation technique, shows how the HFCC pulses affects to the F_m, JFM calculations match 78% of the measured respiratory pattern of P_j. RFM calculations match 90% of measured HFCC induced F_m. These models can be used to test new breathing patterns before designing studies on patients having chronic obstructive pulmonary diseases.