Patrick Bosch1, Tanya S Kenkre2, Doreen Soliman3, Joanne A Londino4, Natalie E Novak4. 1. Department of Orthopaedic Surgery, University of Pittsburgh Medical Center Children's Hospital of Pittsburgh, 4401 Penn Avenue, Faculty Pavilion, 4th Floor, Pittsburgh, PA 15224, USA. Electronic address: Patrick.bosch@chp.edu. 2. Department of Epidemiology, University of Pittsburgh Graduate School of Public Health, Public Health Building, 130 De Soto St, Pittsburgh, PA 15261, USA. 3. Department of Anesthesia, University of Pittsburgh Medical Center Children's Hospital of Pittsburgh, 4401 Penn Avenue, Faculty Pavilion, 4th Floor, Pittsburgh, PA 15224, USA. 4. Department of Orthopaedic Surgery, University of Pittsburgh Medical Center Children's Hospital of Pittsburgh, 4401 Penn Avenue, Faculty Pavilion, 4th Floor, Pittsburgh, PA 15224, USA.
Abstract
STUDY DESIGN: Prospective, observational cohort study. OBJECTIVE: To improve the understanding of coagulation and bleeding mechanisms during spinal deformity surgery. SUMMARY OF BACKGROUND DATA: Fibrinolysis is the mechanism of bleeding for adolescent idiopathic scoliosis undergoing posterior spinal fusion. Antifibrinolytics have become popular; however, literature to support their use remains mixed. The mechanism of action has not been demonstrated. METHODS: The coagulation profile of 88 adolescent idiopathic scoliosis patients undergoing posterior spinal fusion was analyzed. Standard coagulation laboratory investigations and thromboelastograms were drawn hourly through the case. Fifty-eight patients received no antifibrinolytic, whereas 30 patients received tranexamic acid by standardized protocol. The coagulation parameters, estimated blood loss, and transfusion requirements were compared in the two groups. RESULTS: The two cohorts had no differences in demographic or surgical characteristics. Mean age was 13.6 years, 83% were female, a mean of 11.1 levels were fused, and the mean duration of surgery was 209 minutes. The tranexamic acid cohort did not demonstrate a decrease in blood loss. The transfusion rate, however, dropped from 47% in the non-tranexamic acid cohort to 23% in the tranexamic acid cohort (p = .03). Standard coagulation parameters did not differ between the groups. Fibrinolysis was diminished in the tranexamic acid cohort as measured by a Fibrinolysis score (mean maximum value 2.0 without tranexamic acid vs. 0.7 with tranexamic acid, p < .0001) and the lysis percent at 30 minutes by thromboelastogram (elevated to 3.9% without tranexamic acid vs. 1.2% with tranexamic acid at the 3-hour mark, p = .05). CONCLUSIONS: This study provides confirmation of antifibrinolytic activity during posterior spinal fusion for adolescent idiopathic scoliosis. The presented data of fibrinolysis are proposed as standard measurements for future work on controlling blood loss during scoliosis surgery. LEVEL OF EVIDENCE: Level 2, prospective comparative study.
STUDY DESIGN: Prospective, observational cohort study. OBJECTIVE: To improve the understanding of coagulation and bleeding mechanisms during spinal deformity surgery. SUMMARY OF BACKGROUND DATA: Fibrinolysis is the mechanism of bleeding for adolescent idiopathic scoliosis undergoing posterior spinal fusion. Antifibrinolytics have become popular; however, literature to support their use remains mixed. The mechanism of action has not been demonstrated. METHODS: The coagulation profile of 88 adolescent idiopathic scoliosispatients undergoing posterior spinal fusion was analyzed. Standard coagulation laboratory investigations and thromboelastograms were drawn hourly through the case. Fifty-eight patients received no antifibrinolytic, whereas 30 patients received tranexamic acid by standardized protocol. The coagulation parameters, estimated blood loss, and transfusion requirements were compared in the two groups. RESULTS: The two cohorts had no differences in demographic or surgical characteristics. Mean age was 13.6 years, 83% were female, a mean of 11.1 levels were fused, and the mean duration of surgery was 209 minutes. The tranexamic acid cohort did not demonstrate a decrease in blood loss. The transfusion rate, however, dropped from 47% in the non-tranexamic acid cohort to 23% in the tranexamic acid cohort (p = .03). Standard coagulation parameters did not differ between the groups. Fibrinolysis was diminished in the tranexamic acid cohort as measured by a Fibrinolysis score (mean maximum value 2.0 without tranexamic acid vs. 0.7 with tranexamic acid, p < .0001) and the lysis percent at 30 minutes by thromboelastogram (elevated to 3.9% without tranexamic acid vs. 1.2% with tranexamic acid at the 3-hour mark, p = .05). CONCLUSIONS: This study provides confirmation of antifibrinolytic activity during posterior spinal fusion for adolescent idiopathic scoliosis. The presented data of fibrinolysis are proposed as standard measurements for future work on controlling blood loss during scoliosis surgery. LEVEL OF EVIDENCE: Level 2, prospective comparative study.
Authors: Breanne H Y Gibson; Matthew T Duvernay; Lydia J McKeithan; Teresa A Benvenuti; Tracy A Warhoover; Jeffrey E Martus; Gregory A Mencio; Brian R Emerson; Stephanie N Moore-Lotridge; Alexandra J Borst; Jonathan G Schoenecker Journal: Spine Deform Date: 2022-03-05