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Pulm Symbols

Special Symbols in Pulmonology

SymbolExplanation
V Gas volume
V ' Gas Volume/unit time
P Pressure
-P' Mean Gas Pressure
F Fractional concentration
f Respiratory frequency (Breaths/unit time)
D Diffusing capacity phase
R Respiratory Exchange Ratio
I (Small Caps) Inspired gas
E (Small Caps) Expired gas
A (Small Caps) Alveolar gas
T (Small Caps) Tidal gas
D (Small Caps) Dead space gas
B (Small Caps) Barometric
STPD (Small Caps) Standard conditions: temperature 0 degrees C, pressure 760 torr and dry
BTPS (Small Caps) Body temperature and pressure, saturated with water vapor at these conditions
ATPS (Small Caps) Ambient temperature and pressure, saturated with water vapor
Q Blood volume
Q' Volume flow of blood/unit time
C Concentration of gas in blood phase
S % saturation of Hb with O2 or CO
a Arterial blood
c Capillary blood
v Venous blood
-v Mixed Venous Blood
TV or VT Tidal volume: that volume of air moved into or out of the lungs during quiet breathing
VC Vital capacity: the volume equal to TLC RV
IC Inspiratory capacity: the sum of IRV and TV
IRV Inspiratory reserve volume: the maximal volume that can be inhaled from the end-inspiratory level
ERV Expiratory reserve volume: the maximal volume of air that can be exhaled from the end-expiratory position
FRC Functional residual capacity: the volume in the lungs at the end-expiratory position
RV Residual volume: the volume of air remaining in the lungs after a maximal exhalation
TLC Total lung capacity: the volume in the lungs at maximal inflation
IVC Inspiratory vital capacity: the maximum volume of air inhaled from the point of maximum expiration
EVC Expiratory vital capacity: the maximum volume of air exhaled from the point of maximum inspiration
V'co2 CO2 Production
V'o2 O2 Consumption
V'A Alveolar Ventilation
Created by: jestevenson
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