In the air-mix setting, the flow and pressure waveforms that can be produced by the Bird Mark 7 include:
a. constant-flow wave (square) and ascend-ing-pressure wave.
b. ascending-flow wave and descend-ing-pressure wave.
c. descending-flow wave and ascend-ing-pressure wave.
d. sine-flow wave and ascending-pressure wave.
ANS: C
In the air-mix position, the Venturi is activated, producing a descending-flow pattern and an ir-regular pressure waveform that ranges from ascending to rectangular, depending on the compli-ance and resistance of the patient's respiratory system.
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The advantages of using MI-E in conjunction with PPV include:
1. MI-E with PPV generates optimal peak cough expiratory flow (PCEF) for clearing airway se-cretions. 2. MI-E with PPV does not cause airway irritation or discomfort. 3. MI-E with PPV can be used with patients with bullous emphysema. 4. MI-E with PPV may improve vital capacity (VC) and arterial oxygen saturation (SaO2) associ-ated with mucous plugging. a. 1, 2, and 4 only b. 2, 3, and 4 only c. 2 and 4 only d. 1, 2, 3, and 4
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