alexa Localization of local anesthetic solution by magnetic resonance imaging.
Ophthalmology

Ophthalmology

Journal of Clinical & Experimental Ophthalmology

Author(s): NiemiMurola L, Krootila K, Kivisaari R, Kangasmki A, Kivisaari L,

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Abstract PURPOSE: The aim of this study was to examine the distribution of local anesthetic solution by magnetic resonance imaging (MRI) after combined peribulbar and retrobulbar, superomedial retrobulbar, and sub-Tenon's injection in relation to clinical akinesia. DESIGN: Randomized clinical trial. PARTICIPANTS: Fifteen patients scheduled for cataract surgery, 5 patients in each group. METHODS: Five patients received combined peribulbar and retrobulbar anesthesia, 5 patients received superomedial retrobulbar injection, and 5 patients had sub-Tenon's injection, all with a combination of bupivacaine 0.75\%, lidocaine 2\%, and hyaluronidase. The MRI scans were performed before the injection and up to 35 minutes after the injection. RESULTS AND CONCLUSIONS: Reliable anesthesia is achieved using a combined peribulbar and retrobulbar block and a relatively great volume of local anesthetic solution, which spreads throughout the orbit, as evidenced by MRI. After superomedial retrobulbar and sub-Tenon's injection, the local anesthetic solution accumulates behind the globe. Sub-Tenon's injection gives good analgesia and slight akinesia with a very small volume. Superomedial retrobulbar injection and combined peribulbar and retrobulbar block provide a similar degree of exophthalmos, which seems to be the result of the volume injected behind the globe. This article was published in Ophthalmology and referenced in Journal of Clinical & Experimental Ophthalmology

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