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Haemodynamic effects of subarachnoid blockade: 20% lignocaine versus 0.5% plain bupivacaine
M Kamenik1, V Paver-Erzen, L Tos
1Department of Anaesthesiology, Intensive Care and Pain Management, Maribor Teaching Hospital, Maribor, Slovenia, Europe.
Background:
Our study compared the haemodynamic changes after spinal anaesthesia with 2% lignocaine and 0.5% plain bupivacaine.
Methods:
A controlled, randomized trial was performed on 30 patients scheduled for arthroscopic knee surgery. Two percent lignocaine and 0.5% plain bupicacaine was used for spinal anesthesia. We measured cardiac output, blood pressure and level of sensory blockade before and for 25 minutes after spinal anaesthesia.
Results:
In patients developing sensory block below T6 there were no differences between the study drugs in heamodynamic measurements. In patients who developed a sensory block at or above T6 there was a greater drop in mean arterial pressure and cardiac output and a faster decrease in heart rate in patients receiving bupivacaine.
Conclusion:
In patients developing a sensory block at or above the T6 dermatome, the decrease in cardiac output and mean arterial pressure in the first 25 min. after spinal anaesthesia is smaller if 2% lignocaine rather than 0.5% bupivacaine is used for blockade.