Which of the following are characteristics of the anatomical dead space?
I.It changes when a part of a lung is surgically removed.
II.It increases when an artificial airway bypasses the upper airway.
III.It increases during deep inspiration.
IV.It increases with emphysema.

Question

Quizplus · Accepted Answer

The volume in the conducting airways (V_Danat) does not change unless surgery removes part of a lung or unless an artificial airway (endotracheal or tracheostomy tube) bypasses the upper airway dead space. Anatomical dead space increases somewhat during a deep inspiration and with drugs that relax smooth airway muscle because these factors increase the airway diameter. Diseases characterized by hyperinflation of the lungs (e.g., emphysema) increase V_Danat for the same reason. For clinical monitoring purposes, V_Danat volume is considered to be constant.

Which of the Following Are Characteristics of the Anatomical Dead