Abstract |
In order to study the influence of labetalol on the peroperative oxygenation during deliberate hypotension, 50 patients undergoing middle ear microsurgery were randomly divided in two groups of 25 patients; one group receiving labetalol to induce hypotension, the other group receiving placebo in a double blind manner. In the group receiving labetalol the arterial oxygen tension (PaO2) decreased significantly 5 minutes after the intravenous bolus injection. Within 30 minutes the PaO2 returned to the starting level. The arterial carbon dioxide tension (PaCO2) increased within 5 minutes and also returned to the initial level after 30 minutes. These changes were absent in the control group. It is concluded that, although labetalol produces a statistically significant change in PaO2 and PaCO2, this finding has only minor clinical implications and so labetalol remains a safe drug to be used for the induction of deliberate hypotension during middle ear microsurgery.
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Authors | S De Hert, E Boeckx, M Vercauteren, J Claes, P Van den Heyning, H Adriaensen |
Journal | Acta oto-rhino-laryngologica Belgica
(Acta Otorhinolaryngol Belg)
Vol. 43
Issue 2
Pg. 157-62
( 1989)
ISSN: 0001-6497 [Print] Belgium |
PMID | 2603701
(Publication Type: Clinical Trial, Journal Article, Randomized Controlled Trial)
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Chemical References |
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Topics |
- Adult
- Ear, Middle
(surgery)
- Female
- Humans
- Hypotension, Controlled
- Labetalol
(pharmacology)
- Male
- Microsurgery
- Oxygen
(blood)
- Ventilation-Perfusion Ratio
(drug effects)
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