Effect of injection pressure on the success rate of peribulbar block.
The aim of this prospective double-blind study was to evaluate the effect of the pressure on injection of local anaesthetic during peribulbar anaesthesia. Fifty patients scheduled for cataract surgery under peribulbar anaesthesia, with a two injection site technique, were randomly assigned to receive a mixture of 5 ml of etidocaine 1%, 4 ml of bupivacaine 0.5% and hyaluronidase 50 IU, injected under a constant pressure of either 140 g.cm-2 (group 1) or 250 g.cm-2 (group 2). After orbital compression, the degree of akinesia of the extra-ocular and orbicular muscles was graded by clinical assessment. A significantly higher rate of satisfactory akinesia of the extra-ocular muscles was found in group 2 (72% vs 28% in group 1) (p < 0.01). No significant relationship was found between the time taken to administer the anaesthetic mixture at constant pressure and the quality of the block.
Gillart
T
T
Department of Anaesthesia, University Hospital, Clermont-Ferrand, France.
Bazin
J E
JE
Deret
C
C
Aigouy
L
L
Schoeffler
P
P
Raynaud
C
C
D000368:Aged; D000765:Anesthesia, Conduction; D000779:Anesthetics, Local / Q000008:administration & dosage*; D002387:Cataract Extraction; D004311:Double-Blind Method; D005260:Female; D006801:Humans; D008297:Male; D009801:Oculomotor Muscles; D011312:Pressure; D011446:Prospective Studies; D013997:Time Factors
D000779:Anesthetics, Local