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
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
The cough process consists of an inspiratory phase, compressive phase, and expiratory phase
The breath sounds may be soft with a prolonged expiratory phase
Breath control is the ability to extend the expiratory phase
and utilise the breath efficiently.
Examination in the office revealed inspiratory stridor at rest, a prolonged expiratory phase
, and a mildly hoarse voice.
High-resolution computed tomography of the chest with inspiratory and expiratory phase
images revealed that the differences between the areas of high and low attenuation were accentuated on expiration.
Using a proprietary sensor and patented technology, the RESPeRATE device translates a patient's individual breathing patterns into customized musical tones to guide the patient to lengthen the expiratory phase
and thus slow breathing to fewer than ten breaths per minute.
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 unit returns to the therapeutic CPAP level prior to the end expiratory phase
5 seconds until the beginning of the next inspiration was defined as the expiratory phase