CEREBRAL METABOLIC EFFECTS OF HYPERVENTILANTION AND DELIBERATE HYPOTENSION
نویسندگان
چکیده
منابع مشابه
Cerebral metabolic effects of hyperventilation and deliberate hypotension.
A No. 1 Macintosh blade and a 3.5-mm red rubber endotracheal tube with stylet are used. Intubation of the cat is frequently more difficult than intubation of a child since the cat has large, sharp teeth, a large tongue, copious salivation, a small anterior larynx and dome-shaped arytenoid cartilages. Intubation of the cat is a dynamic demonstration which simulates future experiences and gives s...
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Hypotension to a mean blood pressure of 33 mmHg for periods of 70 to 187 minutes was induced by increasing the inspired halothane concentration in 11 baboons which were already anaesthetized with 0·5% halothane, nitrous oxide, and oxygen. During hypotension, cerebral blood flow, measured by Xenon clearance and by a carotid electromagnetic flowmeter, decreased by more than half, and sagittal sin...
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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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Controlled decreases in mean arterial pressure to 20%, 40% and 60% of baseline were produced by the administration of increasing concentrations of adenosine triphosphate (ATP) i.v. in five anaesthetized baboons. Indices of the systemic circulation (arterial pressure, right atrial pressure, pulmonary artery pressures, cardiac output) and of the cerebral circulation (cerebral blood flow, cerebral...
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In two groups of patients undergoing induced hypotension with sodium nitroprusside or trimetaphan blood concentrations of lactate, pyruvate and standard bicarbonate did not differ significantly between the groups. In the nine patients who received trimetaphan there was a progressive, but statistically non-significant, decrease in mean lactate. Nitroprusside (15 patients) was associated with a s...
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ژورنال
عنوان ژورنال: British Journal of Anaesthesia
سال: 1973
ISSN: 0007-0912
DOI: 10.1093/bja/45.3.256