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Oral clonidine premedication prevents the rise in intraocular pressure following succinylcholine administration.

Author(s): Polarz H, Bohrer H, Martin E, Wolfrum J, Volcker HE

Affiliation(s): Klinik fur Anasthesiologie, Heidelberg, Germany.

Publication date & source: 1993-04, Ger J Ophthalmol., 2(2):97-9.

Publication type: Clinical Trial; Randomized Controlled Trial

The objective of the study was to assess the effects of premedication with clonidine on intraocular pressure (IOP) after the administration of succinylcholine. Fifty elderly patients undergoing ophthalmic surgery were randomly allocated to two study groups. Group 1 patients (n = 25) received clonidine, 300 micrograms p.o. In group 2 (n = 25), the benzodiazepine dipotassium clorazepate was given p.o. at a dose of 0.3 mg.kg-1. Anesthesia was induced with thiopental 3-4 mg.kg-1, alfentanil 10 micrograms.kg-1, atracurium 0.07 mg.kg-1, and succinylcholine 1 mg.kg-1. Nine IOP measurements were taken in each patient starting before premedication and ending 3 min after endotracheal intubation. In both groups, there was a decrease in IOP after induction of anesthesia with thiopental and alfentanil. Succinylcholine administration and endotracheal intubation had no further effect on IOP in the clonidine group. In group 2, succinylcholine caused an increase in IOP when compared with the post induction value. We conclude that clonidine premedication can prevent the increase in IOP following succinylcholine administration.

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