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NEONATOLOGY: MANAGEMENT, PROCEDURES, ON-CALL PROBLEMS, DISEASES, AND DRUGS - part 2

máy thở có thể không hiệu quả ở trẻ sơ sinh có cân nặng lúc sinh là 1.800 g. Nếu một trẻ sơ sinh có kích thước này hội đủ điều kiện thông gió tần số cao, các HFJV HFOV có thể chứng minh được hiệu quả hơn.2. Thiết bị a. Infrasonics sao trẻ sơ sinh thở máy. Các nhà sản xuất thích gọi máy thở này một dòng chảy dao động | ventilator may not be effective in infants whose birth weight is 1800 g. If an infant of this size qualifies for high-frequency ventilation the HFJV or the HFOV may prove to be more effective. 2. Equipment a. The Infrasonics Infant Star ventilator. The manufacturer prefers to call this ventilator a flow oscillator because of the ventilation technique used and its flow characteristics. It can be termed a hybrid oscillator because it has features of both a flow interrupter jet and an oscillator. i. The bursts of gas are 18 ms in duration preset at the factory . The sudden expansion of gas after the burst creates a rebound negative-pressure deflection that closely approximates the active exhalation of oscillatory ventilation. ii. The user-defined parameters are frequency 10-20 Hz and amplitude which is a function of volume of gas per burst. b. Conventional ventilator. The high-frequency mode on the Infant Star ventilator must be used in combination with the conventional ventilator. Rate PEEP and PAP are set on the conventional ventilator. c. Endotracheal tube. A regular endotracheal tube is used. 3. Procedure Initiation of Infant Star ventilation a. Conventional ventilator settings i. Rate is set at 5 breaths min. It is extremely important to have a conventional rate set during high frequency so that atelectasis does not develop. VTS are very small during high frequency. ii. PIP and PEEP are not changed from the original settings. b. HFFI settings i. Frequency is always maintained at 15 Hz 900 breaths min . It is not adjusted during high-frequency ventilation. ii. Paw is determined by the PEEP level and initially should be set to match the before initiation of HVF. That is if was 15 on conventional ventilatory support it should be set on the high-frequency ventilator by means of setting the PEEP at 15. iii. Amplitude. After the frequency and the are set the amplitude should be adjusted. It should be increased until the chest wall of the infant begins to vibrate .