What are some key causes of patient-ventilator asynchrony and ...

[AEWBW]

What are some key causes of patient-ventilator asynchrony and increased work of breathing dur-ing pressure-triggered volume-controlled continuous mandatory ventilation?
 
  1. Improper trigger setting
  2. Insufficient inspiratory flow
  3. High peak airway pressures
  a. 1 and 2 only
  b. 1 and 3 only
  c. 2 and 3 only
  d. 1, 2, and 3

Question 2

Which of the following modes of ventilatory support would result in the highest mean airway pressure?
 
  a. Volume-controlled intermittent mandatory ventilation
  b. (Volume-controlled intermittent manda-tory ventilation) + pressure-supported ventilation
  c. Pressure-controlled intermittent mandato-ry ventilation
  d. Volume-controlled continuous mandatory ventilation

[leahm14]

Answer to Question 1

ANS: A
If sensitivity is set too low, such that considerable effort is necessary to trigger the ventilator, pa-tient-ventilator asynchrony occurs. A pressure sensitivity of 0.5 to 1.5 cm H2O or flow sensi-tivity of 1 to 2 L/min is regarded as optimal. Inspiratory flow must be set to meet the patient's inspiratory demand. An insufficient inspiratory flow can cause patient-ventilator asynchrony and increased work of breathing.

Answer to Question 2

ANS: D
Because every breath is volume controlled, mean airway pressure tends to be greater compared with the mean airway pressure with synchronized intermittent mandatory ventilation and pres-sure-supported ventilation, and pulmonary arterial pressure and cardiac output may be lower.

[AEWBW]

TYSM

[yeungji]

Excellent