Abstract
This study investigates three spontaneous respiration modes and the possibility of abdominal distention. Therefore, the experiment will first examine the effect of MAP (Mean Airway Pressure) in a breathing mode that simulates healthy lungs in a neonatal spontaneous breathing simulator when two different air sources (compressor and SLE1000) are used, and then compare the characteristics of three different spontaneous breathing modes (Healthy lungs mode, Lung with increased airway resistance mode, Low compliance lungs mode) in PT-2 when MAP is constant to compare the characteristics of HNCPAP and NDPAP, respectively. The following results were obtained. In the breathing mode of healthy lungs, the likelihood of abdominal distention was very low regardless of the air source or device. Inhalation flow of both devices was similarly reduced by about 3/4 and 2/3 in the lungs with increased airway resistance and low compliance, respectively, based on the healthy lung case, and was dependent on the breathing mode regardless of the device used. In the case of low NDPAP compliance, about 1/3 of the inhalation flow of a healthy lung was added to the counterflow and overlapped with the vortex train generated by the (K-H) instability, resulting in a free jet with increased instability that persisted until the end of inhalation. The direct interference between the free jet and the reverse flow near the inspiratory airway pressure measurement hole caused intermittent leakage into the airway, resulting in abdominal distention.
