Our clinical experience is based on the use Keuskamp's respirator and its function was compared with an experimental model. Using a mechanical lung-thorax analogue, normal and abnormal elastic and airway resistances have been simulated under controlled laboratory circumstances. Calculation of the ventilatory parameters were carried out using a pneumotachograph, electromanometer andpulmorecorder. The following data were determined: inspiratory and expiratory flow rates, ventilatory volumes and respiratory pressures. The method needed to achieve optimal ventilation in different circumstances may be easily demonstrated and explained. The most difficult practical problem is the maintenance of sufficient ventilation for younger children with respiratory pathology. Very often prolonged decrease of compliance and increase resistance are observed. High inspiratory pressure restricted the effective tidal volume and decreased alveolar ventilation. The flowpattern during inspiration should be selected between constant, decelerating and sine-wave. Volume and timecycling devices are less dependent on lung characteristics than pressure cycling mechanism.
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