A patient is receiving iNO via the INOvent delivery system. The ...

[bobbysung]

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.

Question 2

What physiologic response is caused by inhaled nitric oxide?
 
  A. systemic vasodilatation
  B. pulmonary vasodilatation
  C. increased cardiac output
  D. increased gastrointestinal motility

[Missbam101]

Answer to Question 1

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.

Answer to Question 2

ANS: B
A. Incorrect response: See explanation B.
B. Correct response: Nitric oxide (NO) is a selective endogenous pulmonary vasodilator. When administered therapeutically, NO still functions as a selective pulmonary vasodilator for the treatment of pulmonary hypertension. The description, selective pulmonary vasodilator, means that NO reduces pulmonary vascular resistance without affecting systemic vascular resistance. At the same time, that description also means that pulmonary vascular resistance decreases only near ventilated alveoli. The results of inhaled NO are a decrease in intrapulmonary shunting and improved oxygenation. NO does not produce systemic vasodilatation because it rapidly binds to hemoglobin.
C. Incorrect response: See explanation B.
D. Incorrect response: See explanation B.