VD/VT
VD/VT
VD/VT (pronounced: V-D over V-T) is a medical term used in Respiratory Physiology to denote the ratio of physiological Dead Space ventilation (VD) to tidal volume (VT).
Pronunciation
- VD/VT: V-D over V-T
Etymology
The term VD/VT is derived from the following components:
- VD: An abbreviation for "Dead Space," which refers to the portion of each breath that does not participate in gas exchange.
- VT: An abbreviation for "Tidal Volume," which refers to the volume of air moved into or out of the lungs during a single breath.
Definition
VD/VT is a ratio used to assess the efficiency of ventilation. It is calculated by dividing the volume of air that does not participate in gas exchange (VD) by the total volume of air breathed in and out in a single breath (VT). A high VD/VT ratio indicates inefficient ventilation, as a larger proportion of each breath is not participating in gas exchange.
Related Terms
- Respiratory Physiology: The study of how the respiratory system functions.
- Dead Space: The portion of each breath that does not participate in gas exchange.
- Tidal Volume: The volume of air moved into or out of the lungs during a single breath.
- Gas Exchange: The process by which oxygen is taken into the body and carbon dioxide is expelled.
See Also
External links
- Medical encyclopedia article on VD/VT
- Wikipedia's article - VD/VT
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