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April 22, 1974

Oxygen Therapy: Evaluation of Various Air-Entraining Masks

Author Affiliations

From the Department of Medicine, Cornell University Medical College-The New York Hospital, New York. Drs. Friedman and Weber are pulmonary trainees (grant HL 05944). Dr. Briscoe is a career scientist (contract No. I-651) Health Research Council of the City of New York.

JAMA. 1974;228(4):474-478. doi:10.1001/jama.1974.03230290022023

Two types of Venturi masks claiming to deliver 24%, 28%, 35%, and 40% oxygen were studied with a new method employing ultrathin, large plastic bags, as well as by conventional methods. There were considerable variations between actual and claimed performance. Some masks delivered oxygen concentrations higher than the designated value. The masks were not truly "Venturi" in design. Their delivered oxygen concentrations vary somewhat depending on the stage of the patient's respiratory cycle.

(JAMA 228:474-478, 1974)