Chest
Volume 91, Issue 1, January 1987, Pages 15-20
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clinical investigations
Demand Oxygen Delivery during Exercise

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Nine hypoxemic patients with COLD, whose hypoxemia is aggravated by minimal exercise, volunteered for this study. Each subject underwent two treadmill exercise trials at two oxygen delivery settings, each on the DODS and SF delivery systems for a total of four exercise trials. We measured SaO2 via ear oximetry and recorded oxygen usage per minute. We compared the oxygen usage required for the two techniques to achieve an SaO2 of 90 percent. The results indicate that the mean oxygen requirement using the DODS to achieve an SaO2 of 90 percent was 211.4 ml/min as compared to SF delivery which required 1,610.9 ml/min. This implies an oxygen savings advantage of the DODS over SF of 7:1. The fact that the DODS oxygen savings extends to exercise conditions lends support to its use in portable oxygen therapy. Widespread use of this and other oxygen savings techniques could result in significant cost savings while maintaining the desired benefits of supplemental oxygen administration.

Section snippets

Demand Oxygen Delivery System

The DODS (Oxymatic, Chad Therapeutics, Inc, Chatsworth, CA) is a small, durable, 10 oz device, powered by a standard C-cell battery. It incorporates an electronically controlled solenoid valve and is interposed between the patient and the liquid or gas oxygen source (Fig 1). The DODS senses the beginning of inhalation through the nasal cannula and thereupon directs the solenoid valve to open momentarily to deliver a 32 ±2 ml bolus of oxygen. This delivery pulse is complete within 200 msec after

ACKNOWLEDGMENT

We wish to acknowledge and thank Charles Adams; Oswaldo Re, M.D.; Jim Williams; and Gerri Dingier for their help and support in performance of the study and preparation of the manuscript.

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    This research study was supported in part by Chad Therapeutics, Inc., Chatsworth, California, the Danziger Family Fellowship, and the Ray and Alpha Morrow Research Fund.

    Manuscript received April 24; revision accepted July 7.

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