USEFULNESS OF DEMAND OXYGEN DELIVERY SYSTEM FOR PATIENTS WITH CHRONIC RESPIRATORY FAILURE DUE TO MAINLY TUBERCULOSIS SEQUELAE

Abstract

To evaluate the usefulness of a new oxymatic conserver, Demand Oxygen Delivery System (DODS), we compared DODS breathing with Standard steady flow (SF) breathingin thirteen subjects with chronic respiratory failure due to mainly tuberculosis sequelae. The value of the DODS (Oxymatic) is that it delivers oxygen only during early inspiration, so as to minimize loss from delivery during expiratory phase. Improvement of SaO₂, measured by BIOX3740, and PaO₂were observed at rest and on exercise. The oxygenconsumption ratio of the DODS to the SF method was between 0.5 and 0.3, favoring the DODS over the SF method. In some patients DODS hardly ran at rest. But no problemsare observed during exercise. The results indicate the effectiveness of DODS in advancement of quality of life patients with chronic respiratory failure.