Efficacy and Safety of Dexmedetomidine in the Analgesic Prophylaxis , in Patients Undergoing Cardiovascular Surgery

Efficacy and Safety of Dexmedetomidine in the Analgesic Prophylaxis , in Patients Undergoing Cardiovascular Surgery

Efficacy and Safety of Dexmedetomidine in the Analgesic Prophylaxis , in Patients Undergoing Cardiovascular Surgery: Randomized Clinical Trial

Acute pain is one of the complications after cardiothoracic surgeries . It can delay patients´recovery and may increase patients´morbity and mortality. This study intends to evaluate Dexmedetomidine, a highly selective α- 2 receptor agonist, that is currently applied safely and efficiently in intraoperative cardiac surgery. It has analgesic, sedative, anxiolytic and sympatholytic properties, without respiratory- depressant effect. The aim of this study is to investigate whether the intraoperative use of dexmedetomidine is better than the standard analgesia used in the intraoperative period to reduce pain and the consequences of it.

This project is a prospective, double-blinded and randomized clinical trial. Eligible participants are assigned in a 1:1 ratio to either the intervention group (Group Dexmedetomidine) or control group (Group Saline 0,9%), after written informed consent to be obtained. The patients will undergo elective cardiac surgery, with extracorporeal circulation. In the operating room, patients will be monitored for pulse oximetry, invasive blood pressure, electrocardiograms, capnography, central venous pressure and nasopharyngeal temperature probe. Induction of anesthesia is performed with intravenous midazolam, fentanyl, etomidate and neuromuscular blocking agent. Anesthesia is maintained with sevoflurane. Dexmedetomidine, at the rate of 0,3μg/ kg/h, or placebo will be infused from the initiation of the anesthesia up to the end of the procedure, except during the cardiopulmonary by-pass. Placebo is a 0,9% saline. The follow up of the assessment of the groups will extend to the postoperative ICU, where data will be collected, during the first 24 hours after surgery.

The patient will receive Dexmedetomidine, at the rate of 0,3μg/ kg/h, in continuous intravenous infusion from the initiation of the anesthesia up to the end of the procedure, except during the cardiopulmonary by-pass.

The patient will receive a 0,9% saline, in continuous intravenous infusion, from the initiation of the anesthesia up to the end of the procedure, except during the cardiopulmonary by-pass.

Dexmedetomidine injectable solution, at the rate of 0,3μg/ kg/h, will be infused from the initiation of the anesthesia up to the end of the procedure, except during the cardiopulmonary by-pass.

Saline 0,9% will be infused from the initiation of the anesthesia up to the end of the procedure, except during the cardiopulmonary by- pass.

The assessment of pain intensity, in patients with self- reporting, will be done by: Numeric Rating Scale (NRS) 0- 10. Possible score range from 0 (no pain) to 10 (worst pain ever ). The assessment of pain intensity, in patients on mechanical ventilation, will be done by: Behavioral Pain Scale, through facial expression (score 1-4), upper limb movement (score 1-5) and compliance with mechanical ventilation (score 1-3). Possible score range from 3 (no pain) to 12 (maximum pain).

This interval will be observed if the patient is not extubated at the end of the surgery. This will be noted in the medical record.

The serum level of creatinine and urea will be observed, in the usual daily measure. This will be noted in the medical record.

Inclusion Criteria: Patients at least 18 years old and who are undergoing cardiac procedures (coronary artery bypass, valve replacement or combined procedure), with cardiopulmonary by- pass. Exclusion Criteria: Congenital heart disease Infective endocarditis Acute myocardial infarction (<two weeks) Pregnancy Cancer Left ventricle ejection fraction < 40% Cardiogenic shock Emergent procedure Use of vasopressor and/or inotrope, in the preoperative Liver disfunction Renal replacement therapy Nephrectomy Previous renal transplantation Patients who are participating in another clinical research

Kundra S, Taneja S, Choudhary AK, Katyal S, Garg I, Roy R. Effect of a low-dose dexmedetomidine infusion on intraoperative hemodynamics, anesthetic requirements and recovery profile in patients undergoing lumbar spine surgery. J Anaesthesiol Clin Pharmacol. 2019 Apr-Jun;35(2):248-253. doi: 10.4103/joacp.JOACP_338_18.

Bielka K, Kuchyn I, Babych V, Martycshenko K, Inozemtsev O. Dexmedetomidine infusion as an analgesic adjuvant during laparoscopic small es, Cyrillicholecystectomy: a randomized controlled study. BMC Anesthesiol. 2018 Apr 20;18(1):44. doi: 10.1186/s12871-018-0508-6.

Talke P, Chen R, Thomas B, Aggarwall A, Gottlieb A, Thorborg P, Heard S, Cheung A, Son SL, Kallio A. The hemodynamic and adrenergic effects of perioperative dexmedetomidine infusion after vascular surgery. Anesth Analg. 2000 Apr;90(4):834-9. doi: 10.1097/00000539-200004000-00011.

Aho MS, Erkola OA, Scheinin H, Lehtinen AM, Korttila KT. Effect of intravenously administered dexmedetomidine on pain after laparoscopic tubal ligation. Anesth Analg. 1991 Aug;73(2):112-8. doi: 10.1213/00000539-199108000-00002.

Carollo DS, Nossaman BD, Ramadhyani U. Dexmedetomidine: a review of clinical applications. Curr Opin Anaesthesiol. 2008 Aug;21(4):457-61. doi: 10.1097/ACO.0b013e328305e3ef.

Kotfis K, Strzelbicka M, Zegan-Baranska M, Safranow K, Brykczynski M, Zukowski M, Ely EW; POL-BPS Study Group. Validation of the behavioral pain scale to assess pain intensity in adult, intubated postcardiac surgery patients: A cohort observational study - POL-BPS. Medicine (Baltimore). 2018 Sep;97(38):e12443. doi: 10.1097/MD.0000000000012443.

Habibi V, Kiabi FH, Sharifi H. The Effect of Dexmedetomidine on the Acute Pain After Cardiothoracic Surgeries: A Systematic Review. Braz J Cardiovasc Surg. 2018 Jul-Aug;33(4):404-417. doi: 10.21470/1678-9741-2017-0253.

Hall R. Identification of inflammatory mediators and their modulation by strategies for the management of the systemic inflammatory response during cardiac surgery. J Cardiothorac Vasc Anesth. 2013 Oct;27(5):983-1033. doi: 10.1053/j.jvca.2012.09.013. Epub 2012 Dec 29. No abstract available.

Brandao PG, Lobo FR, Ramin SL, Sakr Y, Machado MN, Lobo SM. Dexmedetomidine as an Anesthetic Adjuvant in Cardiac Surgery: a Cohort Study. Braz J Cardiovasc Surg. 2016 May-Jun;31(3):213-218. doi: 10.5935/1678-9741.20160043.

Candiotti KA, Bergese SD, Bokesch PM, Feldman MA, Wisemandle W, Bekker AY; MAC Study Group. Monitored anesthesia care with dexmedetomidine: a prospective, randomized, double-blind, multicenter trial. Anesth Analg. 2010 Jan 1;110(1):47-56. doi: 10.1213/ane.0b013e3181ae0856. Epub 2009 Aug 27.