منابع مشابه
Fixed performance oxygen masks: an evaluation.
Fixed performance oxygen masks operate by supplying mixtures of oxygen and air at rates exceeding the inspiratory flow rate of the patient. In this study the oxygen concentration delivered by three fixed performance oxygen masks was determined non-invasively at various inspiratory flow rates. At low inspiratory flow rates all the masks studied acted as fixed performance devices. When the peak i...
متن کاملAudible noise levels of oxygen masks operating on venturi principle.
Certain oxygen therapy masks operating with a venturi were found to possess audible noise levels sufficient to cause annoyance to the user. This was not true of all masks. However, it is recommended that this is a source of noise pollution that should be eliminated by the manufacturers of such devices.
متن کاملA Brief History of Russian Flying Helmets and Aviator Oxygen Masks
For over fifty years, factual information on a wealth of details concerning Russian military materiel and systems was successfully obscured behind a tight blanket of state-imposed security. Attributable to polar economic philosophies characterising the clash between America‟s system of capitalistic democracy and the Soviet Union's form of state-sponsored (Communist) socialism (during the culmin...
متن کاملRecovery room oxygenation: a comparison of nasal catheters and 40 per cent oxygen masks.
One hundred and sixty-one ASA physical status I-III patients undergoing elective surgery were evaluated using nasal catheters versus 40 per cent O2 venturi masks. Twenty-one per cent of the patients arrived in the recovery room with hypoxia as measured with a pulse oximeter (SaO2 less than 90 per cent). Fifteen minutes later all patients who arrived hypoxic were well oxygenated on their chosen ...
متن کاملNotch Filter Masks: Practical Image Masks for Planet-Finding Coronagraphs
An ideal coronagraph with a band-limited image mask can efficiently image off-axis sources while removing identically all of the light from an on-axis source. However, strict mask construction tolerances limit the utility of this technique for directly imaging extrasolar terrestrial planets. We present a variation on the basic band-limited mask design—a family of “notch filter” masks—that mitig...
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ژورنال
عنوان ژورنال: British Journal of Anaesthesia
سال: 1963
ISSN: 0007-0912
DOI: 10.1093/bja/35.6.368