| FEF50 | forced expiratory flow at 50% of forced vital capacity |
|---|---|
| FEF50/FIF50 | ratio of expiratory flow to inspiratory flow at 50% of forced vital capacity |
| FIF50 | forced inspiratory flow at 50% of forced vital capacity |
| FIVC | forced inspiratory vital capacity |
| FOAVF | failure of all vital forces |
| %VC | Vital Capacity |
|---|---|
| FEF25-75 | forced expiratory flow between 25 and 75% of vital capacity |
| FEV1/ FVC | forced expiratory volume in one second/forced vital capacity |
| vital ultraviolet | Rays necessary or helpful to normal growth; they promote calcium metabolism, are antirachitic in action, and have wavelengths between 3200 and 2900 A |
|---|---|
| noeud vital | A circumscript region in the lower part of the medulla oblongata, near the apex of the calamus scriptorius, interpreted by M. Flourens (1858) as a nerve centre controlling respiration. Synonym: vital knot, vital node. Origin: Fr. (05 Mar 2000) |
| electro-vital | Derived from, or dependent upon, vital processes; said of certain electric currents supposed by some physiologists to circulate in the nerves of animals. Source: Websters Dictionary (01 Mar 1998) |
| forced vital capacity | Vital capacity measured with the subject exhaling as rapidly as possible; data relating volume, expiratory flow, and time form the basis for other pulmonary function tests, e.g., flow-volume curve, forced expiratory volume, forced expiratory time, forced expiratory flow. (05 Mar 2000) |