What are some primary uses for pressure-supported ventilation ...

[madam-professor]

What are some primary uses for pressure-supported ventilation (PSV)? 1. Recruiting collapsed alveoli and improving oxygenation 2. Augmenting patient's spontaneous VT 3. Overcoming the imposed work of breathing
 
  a. 1 and 2 only
  b. 1 and 3 only
  c. 2 and 3 only
  d. 1, 2, and 3

Question 2

A patient switched from pressure-controlled continuous mandatory ventilation (CMV)
 
  with positive end expiratory pressure (PEEP) to pressure-controlled inverse ratio ventilation (PC-IRV) shows a good improvement in PaO2 but a decrease in tissue oxygenation. Which of the following best explains this observation?
  a. High mean pressures caused by PC-IRV decreased pulmonary blood flow.
  b. Intrinsic PEEP caused by PC-IRV result-ed in increased alveolar recruitment.
  c. High mean pressures caused by PC-IRV decreased cardiac output.
  d. Intrinsic PEEP caused by PC-IRV com-pressed the pulmonary capillaries.

[jamesnevil303]

Answer to Question 1

ANS: C
Since the first description of PSV in 1982, it has been used either to overcome the imposed re-sistance associated with the artificial airway or to provide ventilatory support with minimal con-trol.

Answer to Question 2

ANS: C
Although some studies have shown improvement in oxygenation with PC-IRV versus CMV with PEEP, others have shown concurrent decreases in cardiac output.

[madam-professor]

Thank you

[jamesnevil303]

Happy to help you