During positive pressure ventilation, atelectatic regions will inflate, however the alveoli will be unstable and will collapse during the expiratory phase of the breath ( atelectrauma ).
32.
The peak expiratory flow can be measured at the bedside; in acute severe asthma the flow is less than 50 % a person's normal or predicted flow.
33.
It should theoretically be identical to peak expiratory flow ( PEF ), which is, however, generally measured by a peak flow meter and given in liters per minute.
34.
Biphasic stridor ( occurring during both the inspiratory and expiratory phases ) indicates narrowing at the level of the glottis or subglottis, the point between the upper and lower airways.
35.
Consequently, the degree of adaptation may rely on differences in odorant clearance among species, which would include properties of nasal mucociliary, submucosal blood flow, and expiratory desorption.
36.
Further evaluation of a person's respiratory function can be done by assessing the minute ventilation, forced vital capacity ( FVC ), and forced expiratory volume ( FEV ).
37.
During forced exhalation, as when blowing out a candle, expiratory muscles including the abdominal muscles and internal intercostal muscles generate abdominal and thoracic pressure, which forces air out of the lungs.
38.
They say treatment should be " directed at airway control with endotracheal intubation, ventilation using positive end expiratory pressure ( PEEP ), and hyperventilation with supplemental oxygen to control intracranial pressure ".
39.
_Forced expiratory flow measured how fast the air got out, reflecting obstruction in the small airways, where the exchange of oxygen and carbon dioxide between the blood and the lungs takes place.
40.
It is usually presented as a graph of expiratory ( measured in millimeters of mercury, " mmHg " ) plotted against time, or, less commonly, but more usefully, expired volume.
