The volume delivered by a pressure-limited ventilator will decrease under which of the following conditions?
1) The patient's lung or thoracic (chest wall) compliance falls.
2) Airway resistance rises (inspiratory time <3 times the time constant) .
3) The patient tenses the respiratory muscles during inspiration.
4) Airway resistance rises (inspiratory time >3 times the time constant) .

Question

The volume delivered by a pressure-limited ventilator will decrease under which of the following conditions?
1) The patient's lung or thoracic (chest wall) compliance falls.
2) Airway resistance rises (inspiratory time <3 times the time constant).
3) The patient tenses the respiratory muscles during inspiration.
4) Airway resistance rises (inspiratory time >3 times the time constant).

Quizplus · Accepted Answer

When the patient's lung or thoracic (chest wall) compliance falls or when the patient tenses the respiratory muscles during inspiration, the volume delivered by a pressure-limited ventilator will decrease. Additionally, if airway resistance rises and the inspiratory time is greater than 3 times the time constant, the volume delivered will also decrease. Therefore, options 1, 3, and 4 are correct. Option 2 is not correct because an increase in airway resistance with an inspiratory time less than 3 times the time constant does not necessarily lead to a decrease in volume delivered by a pressure-limited ventilator.

The Volume Delivered by a Pressure-Limited Ventilator Will Decrease Under