A Randomised Comparison on the Dose Requirement Between, Levobupivacaine, Ropivacaine and Bupivacaine in Intrathecal Anaesthesia

Minimum Local Anaesthetic Dose for Intrathecal Anaesthesia: a Randomised Comparison Between Levobupivacaine, Ropivacaine and Bupivacaine

To determine and compare the effective intrathecal dose of levobupivacaine, ropivacaine and bupivacaine for 50% of patients in lower limb surgery

Inclusion Criteria:

• body weight=40-90kg,
• height higher than 145cm

Exclusion Criteria:

• Known hypersensitivity to amide local anaesthetics,
• patients who do not understand English and Chinese,
• Body mass index higher than 35 kg per sq metre