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Pulm Symbols
Special Symbols in Pulmonology
| Symbol | Explanation |
|---|---|
| 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 |