During ventilatory support, peak inspiratory pressure (PIP) is ...

[Jkov05]

During ventilatory support, peak inspiratory pressure (PIP) is the pressure needed to overcome which of the following?
 
  1. Chest wall compliance
  2. Lung compliance
  3. Airway resistance
  4. Systemic arterial pressure
  a. 1 and 2 only
  b. 2 and 3 only
  c. 1, 2, and 3 only
  d. 2, 3, and 4 only

Question 2

The respiratory therapist has been called to place a 70-kg male patient with ARDS on ventilatory support. The physician has requested a respiratory rate of 20/min. Which of the following would be an appropriate VT for this patient?
 
  a. 140 ml
  b. 200 ml
  c. 350 ml
  d. 700 ml

[miss_1456@hotmail.com]

Answer to Question 1

ANS: C
During positive pressure mechanical ventilation, peak inspiratory pressure (PIP) is the pressure necessary to overcome airway resistance and lung and chest wall compliance.

Answer to Question 2

ANS: C
The currently acceptable tidal volume for a mechanically ventilated patient with ARDS in acute respiratory failure is 4 to 8 ml/kg. Therefore, the VT must be set between 280 (70 kg  4 ml/kg) and 560 ml (70 kg  8 ml/kg).