Nerve Block Clinical Trial
Official title:
The Minimum Effective Volume (MEV) of 0.5% Ropivacaine in Ultrasound-guided Supra-anterior Superior Iliac Spine Fascia Iliaca Compartment Block (SASIS-FICB)
The Aim of This Study is to Determine the Minimum Effective Volume of Local Anesthetic (Ropivacaine 0.5%) Required to Produce an Effective Ultrasound-guided Supra-anterior Superior Iliac Spine Fascia Iliaca Compartment Block(SASIS-FICB) for Surgical Anesthesia in 90% of Patients Scheduled for Elective Surgery of One Lower Limbs.
The study is based on biased coin design, and the volume of Local Anesthetic (Ropivacaine 0.5%) for the next patient is determined by the result of the last one. In the case of block failure, the volume will be increased by 2.5ml. Conversely, block success will result in either a reduction in volume by 2.5ml (probability 11%) or no change in volume (probability 89%). A blinded assistant will assess sensory and motor blockade in each nerve territory ( the femoral, obturator and lateral femoral cutaneous nerves) at 5-min intervals up to 30 min after completion of the block. Finally, MEV90 is calculated by isotonic regression. ;
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