SummaryThis study investigates the changes in serum magnesium levels after major gastrointestinal surgery and evaluates if Plasma -Lyte 148 used as maintenance fluid influences these changes in the peri-operative period. Thirty patients presenting for procedures ranging from anterior rectal resection to thoraco -abdominal cardio -0esophagectomy were randomly allocated into two groups, one of which received compound sodium lactate solution as the maintenance crystalloid during the intra-and postoperative period, and the other Plasma-Lyte 148, a magnesium -containing crystalloid solution. Serum magnesium levels were measured pre-operatively, in the immediate recovery period and 24 h postoperatively. The results showed a statistically signiJicant ( p < 0.05) reduction in the magnesium levels in both groups. The reduction was less marked in the Plasma-Lyte group but this did not achieve statistical significance ( p > 0.05) compared with the compound sodium lactate group.
Summary
Traditionally, local anaesthesia for cataract surgery requires retrobulbar blockade to be supplemented with a facial nerve block in order to prevent blepharospasm. In this study retrobulbar block using a larger volume of local anaesthetic without facial nerve block is compared with the combined technique in 50 patients. The adequacy of the two techniques was assessed by the surgeon according to eye motility (in four different planes). lid motility and eye softness and an overall surgical assessment was made at the end of the procedure. Blepharospasm did not occur. The operating conditions were equally good in both groups (p > 0.05). These results suggest that good operating conditions for cataract operations can be provided by retrobulbar block alone without supplementary facial nerve block.
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