Which of the following occur with positive-pressure ventilation (PPV)?
1) During inspiration, pleural pressure decreases.
2) During inspiration, pressure in the alveoli increases.
3) The pressure gradients of normal breathing are reversed.
4) During inspiration, alveolar pressure exceeds pleural pressure.

Question

Quizplus · Accepted Answer

During positive-pressure ventilation (PPV), air is pushed into the lungs, increasing the pressure in the alveoli during inspiration. This reverses the normal pressure gradients seen in spontaneous breathing, where pleural pressure decreases to draw air into the lungs. In PPV, alveolar pressure exceeds pleural pressure during inspiration, which is opposite to the normal physiological process.

Which of the Following Occur with Positive-Pressure Ventilation (PPV)