منابع مشابه
Correction for mechanical dead space in the calculation of physiological dead space.
When physiological dead space (Vd(p)) is calculated for a patient who has alveolar dead space, e.g., after pulmonary vascular occlusion, less than the full volume of attached mechanical dead space (Vd(m)) appears in the measured dead space (Vd(n)). Under these conditions the traditional subtraction of Vd(m) from Vd(n) leads to underestimation of Vd(p) and can give a falsely small ratio of Vd(p)...
متن کاملPrediction of the physiological dead-space in resting normal subjects.
1. Two-hundred and forty duplicate estimations of physiological dead-space volume ( VD) were made in forty-eight healthy subjects (twenty-four men and twenty-four women) aged from 20 to 74 years, to assess the predictive accuracy of various standards. 2. The V,/ VT (physiological dead-space volume/tidal volume) ratio standard was least precise, but could be improved by allowing for sex and age....
متن کاملDead space: simplicity to complexity.
CONSIDERABLE UNCERTAINTY existed regarding the magnitude of pulmonary dead space in the immediate post-World War II era. The dead space concept was originated by Bohr (2), who viewed total ventilation as composed of two distinct, but homogeneous, components—alveolar ventilation that participated fully in gas exchange and dead space ventilation in which no respiratory exchange occurred. With kno...
متن کاملPotential effects of corticosteroids on physiological dead-space fraction in acute respiratory distress syndrome.
BACKGROUND Increased dead-space fraction is common in patients with persistent acute respiratory distress syndrome (ARDS). We evaluated the changes in the oxygenation and dead-space fraction in patients with persistent ARDS after corticosteroid therapy. METHODS This was a non-randomized non-placebo, controlled observational study including 19 patients with persistent ARDS treated with cortic...
متن کاملCauses of a high physiological dead space in critically ill patients
Since around 1950, physiological dead space - the difference between arterial and mixed expired pCO2 (partial pressure of carbon dioxide) divided by the arterial pCO2 - has been a useful clinical parameter of pulmonary gas exchange. In the previous issue of Critical Care, Niklason and colleagues remind us that physiological dead space, while easily measured, consolidates potentially very comple...
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ژورنال
عنوان ژورنال: Anaesthesia
سال: 1960
ISSN: 0003-2409,1365-2044
DOI: 10.1111/j.1365-2044.1960.tb13355.x