A patient is receiving iNO via the INOvent delivery system. The therapist is concerned that the patient will not receive a constant NO concentration because the patient experiences altered ventilatory flow patterns. What should the therapist do to ensure that a constant NO concentration is delivered to the patient?
A. Do nothing because the INOvent ensures that a constant NO concentration is delivered.
B. Set the INOvent on the "variable ventilatory pattern" mode to ensure a constant NO concentration is delivered.
C. Activate the injection module on the INOvent to ensure a constant NO concentration is delivered.
D. Because the range of variation of the delivered iNO dose is so small, the concern is unimportant.
ANS: A
A. Correct response: The INOvent has an injection module that is inserted into the inspiratory circuit at the outlet of the ventilator. The injection module consists of a hot film flow sensor and a gas injection tube. Flow in the ventilator circuit is measured precisely, and NO is injected proportional to that flow to provide the desired NO dose. This design enables a precise and constant NO concentration in the inspired gas for any ventilatory pattern NO flows through either a high- or a low-flow controller. The high- and low-flow controllers ensure that the delivered NO concentration is accurate over a wide range of ventilator flows and desired NO concentrations.
B. Incorrect response: See explanation A.
C. Incorrect response: See explanation A.
D. Incorrect response: See explanation A.
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