Predictive Value Of Muscle Tone Loss And Perfusion Index In The Success Of Supraclavicular Brachial Plexus Block: A Pilot Study
Predictive Value Of Muscle Tone Loss And Perfusion Index In The Success Of Supraclavicular Brachial Plexus Block: A Pilot Study
The goal of this observational study is to define the usefulness of a new device to predict the supraclavicular block successfulness in the patients scheduled to orthopedic surgery. The main question it aims to answer is:
¿The combination between a flexometer and perfusion index is capable to predict the successfulness of a supraclavicular block in the first 15 min?
Participants will be anesthetized by residents or anesthesiologist with regional anesthesia training and then connected to a flexometer to measure the motor blockade and a pulse oximeter to measure the perfusion index related to sympathetic blockage at 0, 5, 10 and 15 min .
Prospective observational pilot study conducted at "Dr. Ignacio Morones Prieto" Central Hospital, Mexico, involving 33 patients (ASA 1, 2, 3) requiring surgery on the distal third of the upper limb with ultrasound-guided SCPB. The motor block was assessed with a conductive ink flexion sensor, and the sympathetic block was evaluated with perfusion index via pulse oximeter at 3, 5, 10, and 15 minutes. Block success was defined as a Numerical Rating Scale (NRS) for pain <2 during surgical stimulation. Statistical comparisons were made between successful and unsuccessful blocks, with ROC curve analysis identifying optimal cutoff points for predictive variables.
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Exclusion Criteria: