{
  "abstract": "Please confirm that an ethics committee approval has been applied for or granted: Yes: I’m uploading the Ethics Committee Approval as a PDF file with this abstract submissionBackground and Aims Detection of failed nerve blocks remains a big problem in our modern busy clinical practice. Methods currently used are subjective and not always precise. Thermographic method is a promising objective, quantitative tool for this task. Still, questions remain about it: How long to wait for confirmation of a successful nerve block? Does choice of different local anesthetics influence speed of onset for temperature changes? The aim of our research was to answer these questions.Methods A prospective, randomized research done in the Hospital Of Traumatology and Orthopedics in Riga, with 35 elective patients collected. All patients recieved N. ischiadicus block in suprapopliteal approach, using ultrasound and nerve stimulator. 3 different local anesthetics were used in equipotent doses, fixed concentrations- 20 ml of 0.25% bupivacaine[N= 10], 20 ml of 1% Lidocaine[N=12], 20 ml of 0.375% Ropivacaine[N=13]. Before and for 45 minutes after nerve block for every minute pictures of the blocked foot were taken. Pictures were analysed using HICKMICRO official software program, with statistics done by LU Statistics Laboratory.Results Using Wilcoxon range tests, statistically significant temperature changes compared to before nerve block (p<0.05) can be seen after 10 minutes for Ropivacaine, 15 minutes for Bupivacaine and Lidocaine. Using linear regression models, we can see that the fastest increase in temperature can be seen in Ropivacaine group up to 25 minutes with slope coefficent of 0.315, followed by Lidocaine (0.246) and bupivacaine (0.234) with R squared test describing how well models predict changes above 0.96 in all of them.Abstract P181 Table 1Linear regression tableAbstract P181 Table 2B- bupivacaine group, L- lidocaine group, R- ropivacaine groupAbstract P181 Figure 1B- bupivacaine group, L- lidocaine group, R- ropivacaine groupConclusions While ropivacaine group did show substantially faster speed of onset till 25th minute, from clinical standpoint there is not significant difference between different local anesthetics when using thermography method. On average, at least 10 minutes must pass to determine success of a nerve block.",
  "authors": [
    {
      "affiliations": [
        "Anesthesiology – Intensive Care, Hospital of Traumatology and Orthopedics, Riga, Latvia"
      ],
      "name": "Andrejs Zirnis"
    },
    {
      "affiliations": [
        "Anesthesiology – Intensive Care, Hospital of Traumatology and Orthopedics, Riga, Latvia",
        "Associated Professor, Riga Stradiņš University, Riga, Latvia"
      ],
      "name": "Iveta Golubovska"
    },
    {
      "affiliations": [
        "Anesthesiology – Intensive Care, Hospital of Traumatology and Orthopedics, Riga, Latvia",
        "Professor, University of Latvia, Riga, Latvia"
      ],
      "name": "Aleksejs Miščuks"
    },
    {
      "affiliations": [
        "Researcher, University of Latvia, Institute of Atomphysics and Spectroscopy, Riga, Latvia"
      ],
      "name": "Uldis Rubīns"
    },
    {
      "affiliations": [
        "Medical Student, University of Latvia, Riga, Latvia"
      ],
      "name": "Valērija Kopanceva"
    },
    {
      "affiliations": [
        "Medical Student, Riga Stradiņš University, Riga, Latvia"
      ],
      "name": "Everita Binde"
    },
    {
      "affiliations": [
        "Medical Student, Riga Stradiņš University, Riga, Latvia"
      ],
      "name": "Valentīna Sļepiha"
    }
  ],
  "title": "P181 Characteristics of skin temperature changes for n.ischiadicus blocks as observed by thermographic method when different local anesthetics are used",
  "uid": "013f430b-b825-5f5a-8b57-5ee84407e9ae"
}