| FEC | forced expiratory capacity; free erythrocyte coproporphyrin; freestanding emergency center; Friend e... |
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| FEE | forced equilibrating expiration |
| FEF | forced expiratory flow |
| FEF50/FIF50 | ratio of expiratory flow to inspiratory flow at 50% of forced vital capacity |
| FEFV | forced expiratory flow volume |
| shallow breathing | A type of breathing with abnormally low tidal volume. (05 Mar 2000) |
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| stertorous breathing | Harsh, noisy breathing usually heard in an comatous patient. Synonym: stertorous breathing. (05 Mar 2000) |
| intermittent positive-pressure breathing | Application of positive pressure to the inspiratory phase of spontaneous respiration. See: controlled mechanical ventilation (12 Dec 1998) |
| kussmaul breathing | Air hunger. (12 Dec 1998) |