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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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| Name | Type | Description | Arm Group Labels | Other Names |
|---|---|---|---|---|
| measure motor strength and perfusion index | Diagnostic Test | measurements of the motor strength and perfusion index in the blocked hand to predict the successfulness of the supraclavicular block at 0, 5, 10 and 15 min post blockage. |
| Measure | Description | Time Frame |
|---|---|---|
| measurement of motor strength with the flexometer in the blocked hand at 0, 5, 10, 15 minutes post blockage | the patient will be asked to move the third finger of the blocked hand which will be connected to the flexometer to measure the motor strength at 0, 5, 10 and 15 minutes and correlate with the successfulness of the block. | Periprocedural |
| measurement of sympathetic block with perfusion index in the blocked hand | measurement of the perfusion index in the blocked hand at 0, 5, 10 and 15 minutes post blockage and correlate with the sympathetic block and successfulness of the supraclavicular block. | Periprocedural |
| Measure | Description | Time Frame |
|---|---|---|
| success of supraclavicular block | measure the success of the block defined as Numeric Scale Rate (NRS from 0 to 10) less 2 and absence to change the anesthetic technique during the surgery. Less NRS is correlated with successfulness of the blockage. | Periprocedural |
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Inclusion Criteria:
Exclusion Criteria:
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patients scheduled to orthopedic surgery of the upper limb in the Hospital General "Dr. Ignacio Morones Prieto" in San Luis Potosi, Mexico.
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| Name | Affiliation | Role |
|---|---|---|
| Marco A Govea-Hernandez, Anesthesiologist | anesthesia department | Study Director |
| Mauricio Guerra-Hernandez, Medical Doctor | Anesthesiology Departmen | Study Chair |
| Venance Basil-Kway, Medical Doctor | Clinical Investigation Department | Study Director |
| Facility | Status | City | State | ZIP | Country | Contacts |
|---|---|---|---|---|---|---|
| Hospital General "Dr. Ignacio Morones Prieto" | San Luis Potosí City | San Luis Potosí | 78250 | Mexico |
| PubMed Identifier | Type | Citation | Retractions |
|---|---|---|---|
| 22030724 | Background | Roy M, Nadeau MJ, Cote D, Levesque S, Dion N, Nicole PC, Turgeon AF. Comparison of a single- or double-injection technique for ultrasound-guided supraclavicular block: a prospective, randomized, blinded controlled study. Reg Anesth Pain Med. 2012 Jan-Feb;37(1):55-9. doi: 10.1097/AAP.0b013e3182367b97. | |
| 19282715 | Background |
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at the moment, the patients data are confidential, so, we haven't decide to share with other investigators. only data used in the results will be available.
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| Type | Date | Date Unknown |
|---|---|---|
| Release | May 7, 2025 | |
| Reset | May 23, 2025 | |
| Release | May 23, 2026 | |
| Reset | Jun 18, 2026 |
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| Release Date | Unrelease Date | Unrelease Date Unknown | Reset Date | MCP Release Number |
|---|---|---|---|---|
| May 7, 2025 | May 23, 2025 | |||
| May 23, 2026 |
| ID | Term |
|---|---|
| D000081282 | Perfusion Index |
| ID | Term |
|---|---|
| D003935 | Diagnostic Techniques, Cardiovascular |
| D019937 | Diagnostic Techniques and Procedures |
| D003933 | Diagnosis |
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| Perlas A, Lobo G, Lo N, Brull R, Chan VW, Karkhanis R. Ultrasound-guided supraclavicular block: outcome of 510 consecutive cases. Reg Anesth Pain Med. 2009 Mar-Apr;34(2):171-6. doi: 10.1097/AAP.0b013e31819a3f81. |
| Background | Vásquez, M., Jiménez, A., Aguirre, O., Gonzalez, M., y Ríos, A. (2012). Bilateral ultrasound-guided supraclavicular block. Revista colombiana de anestesiología, 40(4), 304-308. |
| 23959836 | Background | Mian A, Chaudhry I, Huang R, Rizk E, Tubbs RS, Loukas M. Brachial plexus anesthesia: A review of the relevant anatomy, complications, and anatomical variations. Clin Anat. 2014 Mar;27(2):210-21. doi: 10.1002/ca.22254. Epub 2013 Aug 20. |
| Background | Dzul-Martín, C., y Torres-Anaya, C. (2016). Actualidades en el bloqueo de plexo braquial. Revista mexicana de anestesiología, 39(1), 272-275. |
| Jun 18, 2026 |