Plasma Concentration of Somatostatin and Endocannabinoids After GA and RA in Upper Extremity Trauma Surgery (SECsGRUES)

Plasma Concentration of Somatostatin and Endocannabinoids After GA and RA in Upper Extremity Trauma Surgery

Comparative Measurement of the Concentration of Blood Somatostatin and Fatty Amid Acids in Upper Extremity Trauma Surgery Under General and Regional Anesthesia

The application of RA can decrease the central sensitization and chronic pain after trauma surgery. The plasma concentrations of somatostatin and fatty acid amides were not studied up to this time in this kind of settings, so investigators believe that this is the first work that shows how upper extremity nerve blockade changes the plasma concentration of somatostatin and fatty acid amides in upper limb surgery in trauma patients.

Total of 100 American Society of Anesthesiologist (ASA) I-III, adult patients scheduled to elective or emergency trauma surgery of hand/forearm or shoulder are planned to be randomly allocated to general anaesthesia (GA) or ultrasound-guided (UG) brachial plexus block (BPB) group, in this randomized-prospective study after approval by the University Research Ethics Board, Pécs University Medical School, Hungary. All of the patients will receive detailed information about the planned BPB or GA techniques and surgeries, then written informed consents will be obtained. Study participants are planned to be assigned randomly into 4 groups (Shoulder GA; Shoulder RA; Hand/forearm GA; Hand/forearm RA). Standardized UG Axillary-supraclavicular (AX-SC) approach to the BP is planned to be performed under sterile conditions, or standardized GA with propofol IV, fentanyl IV, and 1 MAC (minimal alveolar concentration) sevoflurane, by experienced anesthesiologists. Blood samples will be taken at 0-time point (straight before the administration of BP injection or the induction of GA) and straight after the surgery. The collected serum samples are stored at -70 °C for a maximum of two weeks prior to analysis. Qualitative and quantitative determination of endocannabinoids and corticosteroids is performed by supercritical fluid chromatography coupled with tandem mass spectrometry after salting-out assisted liquid-liquid microextraction. For somatostatin measurement, the samples are immediately supplemented with aprotinin (20µl/ml blood sample; Gordox 10 KIU/ml (Kallikrein Inhibitor Unit/ml), Richter Gedeon Budapest, Hungary) and transported for centrifugation on ice. The pellet is discarded, and the plasma is stored at -80⁰C until further processing. The somatostatin concentration of the plasma sample is determined with both ELISA (CEA592Hu, Cloud-Clone Corp., Wuhan, PRC) and radioimmunoassay. The results are collected and analyzed. Demographic data, vital parameters, and verbal numeric rate of pain intensity are collected prior to and after surgery.

Study participants n=25 in the S-GA, n=25 in the S-RA, n=25 in the H-GA, and n=25 in the H-RA Groups.

Forearm, wrist and hand surgery after fentanyl and propofol induction of anaesthesia, with sevoflurane maintenance

Forearm, wrist and hand surgery under brachial plexus block with 0.4 ml/kg of 0.33% bupivacaine solution Other Names: Marcaine 5 mg/ml Astra Zeneca OGYI-T 6496/14

Inclusion Criteria: upper extremity fracture surgery of hand/forearm or upper arm unpremedicated patients scheduled for elective or emergency trauma Exclusion Criteria: psycho-mental conditions interfering with consent or assessment the patient refused to participate preexisting chronic pain condition daily analgesic or sedative or steroid consumption sedative or analgesic premedication pre-existing neuro-endocrine disorders antecedent cancer advanced liver or kidney disease.