Letters to the Editors

Abstract

To the Editors In reference to Dr. Gerald Bristow's article in the July, 1980 issue of Seminars in Respiratory Medicine, Volume 2, Number 1, entitled "Oxygen Therapy." He stated that it is important to recognize that with the venturi mask system the concentration of oxygen inhaled by the patient will usually be lower than the set on the manifold of the venturi mask system because of entrainment of room air through the side holes in the mask or between the face and the mask. This information is incorrect. Venturi-style masks are designed to deliver precise oxygen concentration and as a result of their accuracy, are a valuable tool in treating patients with chronic lung disease. Their precision occurs due to the high total flow of gas into the mask thereby nullifying any inherent leaks which occur in all masks. Specifications vary from one manufacturer to another but this list indicates approximate total flows to the mask at various concentrations: