Which of the following factors cause the isothermic saturation boundary (ISB) to shift farther down into the airways?
1) Decreased ambient temperature
2) Increased tidal volume (V_T)
3) Endotracheal intubation

Question

Quizplus · Accepted Answer

The isothermic saturation boundary (ISB) shifts farther down into the airways due to decreased ambient temperature, increased tidal volume, and endotracheal intubation. Lower temperatures and larger tidal volumes increase the distance the inspired air must travel before reaching body temperature and full saturation with water vapor, while endotracheal intubation bypasses the upper airway's natural warming and humidifying mechanisms, also causing the ISB to shift downward.

Which of the Following Factors Cause the Isothermic Saturation Boundary