When the dead space-to-tidal volume ratio (Vᴅ/Vᴛ) is calculated, Vᴅ refers to the _____ dead space.

Question

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VD has two components: anatomic dead space and alveolar dead space. Anatomic dead space is made up of the conducting airways and normally measures about 1 mL/kg of ideal body weight. Alveolar dead space is classically defined as alveoli that are ventilated but are not perfused. The combination of anatomic and alveolar dead space is called physiologic dead space.

When the Dead Space-To-Tidal Volume Ratio (Vᴅ/Vᴛ) Is Calculated, Vᴅ