Forty-four patients needed 2 cmH2O or greater CPAP increase for the disappearance of flow limitation and PLM.
The monitoring technique we used for airflow, a nasal cannula and examination of the flow signal for the characteristic shape of flow limitation, should have detected subtle forms of sleep disturbed breathing in our sleep studies, but only rare occurrences of patterns of air flow consistent with flow limitation were found here.
Infarction may not occur for hours at this degree of flow limitation [ 2] and some electrical activity (mostly delta frequencies) may be seen, but as the CBF continues to decrease toward the infarction threshold 10-122 ml/100 g/min and below), the EEG becomes silent and cellular damage becomes irreversible [ 2- 4].
It allows measurement of respiratory mechanics continuously at the bedside, even in presence of flow limitation [23], without the need for constant inspiratory flow rate, end-inspiratory hold and end-expiratory occlusion.
On the other hand, FEFR50% and FEFR25%, which are used for estimating flow limitation in the peripheral airways, were significantly increased after salbutamol inhalation in all BRC, and the magnitude of increase among BA, CVA and NHBRC was comparable.
The modelling is based on a limitation by flooding of the flow entering the gap (CCFL for counter-current flow limitation).
However, the results obtained in analogue models, in animals and in patients suggest that FOT is useful for characterising the viscoelas-tic properties of respiratory tissues [ 7], for assessing inhomogeneities in the respiratory system [ 5, 6, 7] and for detecting expiratory flow limitation during mechanical ventilation [ 16, 29].
A flow limitation for each steam extraction.
Among others these can be: A flow limitation for each steam extraction.
The mechanism(s) for increased resistance, expiratory flow limitation and dynamic hyperinflation are not clear but probably relate to multiple factors.
