IRV was considered a closed circuit method for raising mean airway pressure and arterial blood gases, and as emphasized by Lachmann (an early "open lung" advocate), it was imperative not to allow the lung to collapse during the relatively brief expiratory phase
FEF 25% to 75% is the measurement of the forced vital capacity, excluding the first 25% and the last 25% of the expiratory phase
Acoustic analysis from the last 30s of each exercise stage was analyzed from digital recordings for breathing frequency and a variable referred to as 'intensity' (obtained from the expiratory phase
of the acoustic signature); which is conceptually similar to tidal volume divided by the expiratory time.
The inflating valve replaces the need for continuous gas flow to inflate the lungs during IPPV by automatically occluding the exit port of the breathing system; gas is directed to the patient during the inspiratory phase of a positive pressure breath and then vented to atmosphere during the expiratory phase
Availing of the heartlung interaction, if we observe closely the pulse pressure dicrotic wave generated by a peripheral artery in patients on mechanical ventilation, we will note a variation in its contour according to the phase of the current ventilatory cycle (2,3,10); this is how during inspiration, the wave tends to rise and during the expiratory phase
it is depressed (Figure 1).
Physical examination revealed increased work of breathing, and wheezes in all lung fields with prolonged expiratory phase
Flow-volume loop showed a flattening of the inspiratory and expiratory phase
compatible with a fixed extrathoracic obstruction.
PEEP refers to a level of positive pressure maintained during the expiratory phase
of ventilation, which facilitates recruitment of non-functioning regions of the lung.
Examination in the office revealed inspiratory stridor at rest, a prolonged expiratory phase
, and a mildly hoarse voice.
The presence of spinal shock combined with the effects of gravity impact the expiratory phase
more than the inspiratory phase of respiration (Fig 1).
The physical examination was significant for mild bibasilar rales with an increased expiratory phase
, and a smooth, symmetrically enlarged prostate.