منابع مشابه
Differentiating inspiratory and expiratory valve malfunctions.
hyperemia directly after release of the blood pressure cuff. As stated in our article, we did not measure reactive hyperemia but performed our measurements in all groups after 20 min of reperfusion. It is, therefore, unlikely that reactive hyperemia caused the observed differences between groups. We agree that further studies are needed to clarify more the mechanisms of helium preconditioning i...
متن کاملThe avian lung: is there an aerodynamic expiratory valve?
The unidirectional gas-flow pattern through the avian lung is thought to result from 'aerodynamic valves'; support for this hypothesis lies mainly in the failure to find any evidence for anatomical valves. During expiration, air flows from the caudal air sacs through the major exchange area of the lung, the paleopulmonic parabronchi, instead of bypassing the lungs via the intrapulmonary bronchu...
متن کاملAdverse effects of buffered glutaraldehyde on the Heidbrink expiratory valve.
The effect of chemical disinfection of the Heidbrink expiratory valve in buffered glutaraldehyde (Cidex solution) was investigated. Cidex caused stickiness and increased the opening pressure and resistance of the valve to different gas flow rates. An electrolytic type of corrosion may also have occurred. However, autoclaving of the Heidbrink valve did not appear to cause corrosion or significan...
متن کاملFlow resistance of expiratory positive-pressure valve systems.
The flow-resistive characteristics of a variety of commercially available expiratory positive-pressure valve systems used to provide continuous positive airway pressure (CPAP) and positive end-expiratory pressure were evaluated. One flow-resistor and seven threshold-resistor expiratory pressure valve systems were set at 5, 10, 15, 20, and 25 cm H2O of expiratory pressure, and sinusoidal exhaled...
متن کاملMalfunction of the Expiratory Valve During Spontaneous Ventilation.
The integrity of inspiratory and expiratory unidirectional valves is very important in the normal functioning of an anesthetic circle breathing system. We describe our experience of an emergency manipulation of a ceramic valve disk of a circle breathing system (Dräger Fabius GS, Dräger Medical Inc) that altered its characteristics and led to rebreathing only during spontaneous ventilation.
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ژورنال
عنوان ژورنال: Anaesthesia
سال: 1989
ISSN: 0003-2409,1365-2044
DOI: 10.1111/j.1365-2044.1989.tb11345.x