To Compare lidocaine2%/Clonidine in Combination, With Bupivacaine 0.5 % Alone in Equal Volumes for Combined Sciatic-saphenous Nerve Block in Terms of Selectivity of Blockade
Bimalleolar Fractures of the Ankle., Sciatic Nerve Block., Saphenous Nerve Block.
About this trial
This is an interventional treatment trial for Bimalleolar Fractures of the Ankle. focused on measuring local anaesthesia, analgesia, bupivacaine, lidocaine, clonidine, sciatic nerve, saphenous nerve
Eligibility Criteria
Inclusion Criteria:
- ASA 1-3 patients scheduled to undergo semi elective ankle/foot surgery with regional anaesthesia will be recruited.
Exclusion Criteria:
- patient refusal,
- allergy to local anaesthetics,
- coagulopathy,
- malignancy or infection at the block performance site,
- significant peripheral neuropathy or neurologic disorder of the lower extremity or any other contraindication to sciatic and saphenous nerve block,
- pregnancy,
- history of alcohol or drug dependency/abuse (defined as >40 IU/week),
- a history of significant cognitive or psychiatric disorder that may affect patient assessment.
Sites / Locations
- Cork University Hospital
Arms of the Study
Arm 1
Arm 2
Experimental
Active Comparator
Group L
Group B
40 mls of 2% lidocaine + 1.5 mcg/kg will be drawn up by an attending anaesthetist to blind the operator. Patients in this group will receive an ultra sound guided sciatic nerve block , 3 cm proximal to the nerve bifurcation, with 25 mls of the above mentioned solution and an ultra sound guided saphenous nerve block in the midthigh just lateral to the profunda femoris artery with 15 mls of the above mentioned solution.
40 mls of 0.5% bupivacaine will be drawn up by an attending anaesthetist to blind the operator. Patients in this group will receive an ultra sound guided sciatic nerve block , 3 cm proximal to the nerve bifurcation, with 25 mls of the above mentioned solution and an ultra sound guided saphenous nerve block in the midthigh just lateral to the profunda femoris artery with 15 mls of the above mentioned solution.