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a proper pressure level to maintain positive pressure within the airway
throughout the respiratory cycle.
CPAP provides only a certain constant pressure support, not assistant
ventilation function. Patient's respiratory patterns including frequency,
amplitude, flow rate and tidal volume are all controlled by himself/herself.
Therefore, any patient to whom CPAP is applied must have normal function
to drive his/her respiratory center and sufficient capacity of spontaneous
breathing.
A typical pressure waveform of CPAP is shown below:
FIGURE 32 CPAP
5.5.5 HFNC
HFNC is a high-flow oxygen therapy mode. In this mode, you can adjust the
oxygen flow rate and oxygen concentration. This mode is suitable for patients
with respiratory failure who have spontaneous breathing.
5.6
Execution of Ventilation
5.6.1 Intubation
Before connecting cannula to patient breathing valve, the patient will usually
be intubated(As shown below).
1. Set proper ventilation mode and related respiration parameters based on
patient's condition.
2. Connect patient breathing valve to the connector of tracheal cannula.
3. During ventilation, always keep observing the respiration parameters on
the screen, so as to ensure your ventilation mode and parameters as set
are suitable to the patient.