RESUMEN
BACKGROUND: Skin temperature measurements after peripheral nerve block can be used as an easy and objective method to help predict block success. Thermochromic nail polishes are popular cosmetic products especially among young women. The colour change of nail polish is based on a thermochromic reaction as the temperature changes. OBJECTIVE: The aim of this study was to test the hypothesis that the success of infraclavicular brachial plexus blocks (IBPBs) can be predicted by the colour change in thermochromic nail polish, which depends on skin temperature changes. DESIGN: A prospective cohort study. SETTING: Training and research hospital from December 2018 to March 2019. PATIENTS: A total of 50 patients who received IBPB for forearm, wrist or hand surgery were included. MAIN OUTCOME MEASURES: Thermochromic nail polish was applied to the nails of both hands of all patients before the block. Reaction of the nail polish in both hands was photographed immediately after application of nail polish and at 30âmin after performing the block. The digital photographs of each patient were evaluated by observers. To evaluate the validity of the colour change in nail polish in predicting a successful IBPB, sensitivity, specificity, positive and negative predictive values and positive and negative likelihood ratios were estimated. RESULTS: The positive predictive value for colour change in thermochromic nail polish predicting a successful IBPB was 96% [95% confidence interval (CI) 90 to 98] and sensitivity was 94% (95% CI 87 to 97). Fleiss kappa value showed substantial agreement (0.76; 95% CI 0.59 to 0.93) in the assessment of interobserver agreement. CONCLUSION: The current study demonstrates that the colour change in thermochromic nail polish is a valid and reliable indicator for the prediction of block success. TRIAL REGISTRATION: ClinicalTrials.gov identifier: NCT03767868.
Asunto(s)
Bloqueo del Plexo Braquial/métodos , Color , Monitoreo Intraoperatorio/métodos , Temperatura Cutánea , Adulto , Cosméticos , Femenino , Humanos , Masculino , Persona de Mediana Edad , Fotograbar , Polonia , Estudios Prospectivos , Resultado del Tratamiento , Adulto JovenRESUMEN
Combined peripheral nerve blocks can be used as an alternative anesthetic technique for lower limb amputations in high-risk patients. The approach may vary according to the clinical condition of the patient. Presently described is the use of a combination of peripheral nerve blocks used for above-the-knee amputation in a high-risk patient: a sciatic nerve block with an anterior approach, a femoral nerve block, and a lateral femoral cutaneous nerve block.