PULMONARY GAS EXCHANGE DURING DELIBERATE HYPOTENSION
نویسندگان
چکیده
منابع مشابه
Pulmonary Gas Exchange during Deliberate Hypotension.
Respiratory physiological deadspace may increase from 35 per cent of the tidal volume in the normal anaesthetized, normotensive and supine patient to as much as 80 per cent in the hypotensive patient in the head-up tilt. Increased mean airway pressure, hypotension, sudden head-up tilt or maintenance of tilt, all tend to increase the respiratory deadspace. Arterial and end-tidal Pco3 differences...
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Haemodynamic measurements and estimates of pulmonary gas exchange have been made in 15 patients during varying degrees of deliberate arterial hypotension induced by IPPV with varying concentrations of halothane in oxygen. Used in this way, halothane caused a dose-dependent arterial hypotension, which was directly related to a reduction in stroke volume and cardiac output, raised right atrial pr...
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Increased ventilation-perfusion (VA/Q) inequality is observed in approximately 50% of humans during heavy exercise and contributes to the widening of the alveolar-arterial O2 difference (A-aDO2). Despite extensive investigation, the cause remains unknown. As a first step to more direct examination of this problem, we developed an animal model. Eight Yucatan miniswine were studied at rest and du...
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When a subject is totally immersed in water while holding his breath, a loss of buoyancy occurs.This phenomenon can be demonstrated by resting the subject on 1 pan of a balance, the loss of buoyancy being reflected as a gain in weight on the balance. This gain in weight (or loss of buoyancy) was first observed by us while determining body density by an underwater weighing method (1). This gain ...
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altitude either during physical maturation (at age 10±4 yr) or as adults (at age 26±4 yr). The relative degree of acclimatization achieved in these lowland residents was assessed through their comparison both with normal sea-level values and with two additional groups of short-term sojourners and natives to 3,100 m. DLco at rest and work was significantly elevated above normal and above sojourn...
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ژورنال
عنوان ژورنال: British Journal of Anaesthesia
سال: 1963
ISSN: 0007-0912
DOI: 10.1093/bja/35.12.750