TITLE: Patients Perceive Perioperative Complications as More Severe and Having Greater Negative Consequences than Surgeons AUTHORS (LAST NAME, FIRST NAME): Cabalo, Adam2; Bess, Shay1; Lanning, Kara2; Akbarnia, Behrooz A.4; Boachie-Adjei, Oheneba5; Burton, Douglas C.6; Gupta, Munish7; Hostin, Richard 9; Shaffrey, Christopher I.8; Wood, Kirkham B.10; Kebaish, Khaled M.11; Cunningham, Matthew E.5; Hart, Robert A.2; Study Group, International Spine 3 INSTITUTIONS (ALL): 1. Orthopaedics, Rocky Mountain Hospital for Children, Denver, CO, USA. 2. Orthopaedics, Oregon Health Sciences University, Portland, OR, USA. 3. ISSG, San Diego, CA, USA. 4. San Diego Center for Spinal Disorders, La Jolla, CA, USA. 5. Hospital for Special Surgery, New York, NY, USA. 6. University of Kansas Medical Center, Kansas City, KS, USA. 7. University of California - Davis , Sacramento, CA, USA. 8. University of Virginia, Charlottesville, VA, USA. 9. Baylor Scoliosis Center, Plano, TX, USA. 10. Orthopaedic Surgery, Massachusetts General Hospital, Boston, MA, USA. 11. Johns Hopkins University, Baltimore, MD, USA. ABSTRACT BODY: Summary (80 words max): Survey of patient and surgeon perceptions of different perioperative complications associated with spinal deformity surgery demonstrated patients perceive complications more severe and more negatively impacting satisfaction and quality of life than surgeons. Dural tear and blood transfusion demonstrated the greatest discrepancy between patient and surgeon perceptions. These results demonstrate a potential need for improved patient education and surgeon communication, and will be used to further develop an adverse event impact instrument. Introduction: The clinical and medicolegal consequences of perioperative complications following spinal deformity surgery negatively impact outcomes. Patient outcomes following perioperative complications have been evaluated, but a complications disability measure does not exist. We evaluated surgeon and patient perceptions of different complications to help create an adverse event impact instrument. Methods: Descriptions of 22 spine surgery complications were administered to 14 spine surgeons and 15 adult spinal deformity patients. Participants assigned visual analog severity based numerical value to each complication (0-10; 0 = not severe, 10 = worst possible). Questions included perceived; 1) complication severity =SEVERITY, 2) complication impact upon procedure satisfaction=SATISFACTION, and 3) complication impact on quality of life=LIFE. Values were evaluated using ANOVA and student’s t-test. Results: Mean SEVERITY difference between surgeons (5.2, range 1.1 ±1.9=blood transfusion-10.0 ± 0.0=death) and patients (6.4, range 2.6 ± 2.6=UTI- 9.2 ± 2.3=stroke) approached significance (p=0.068). Mean SATISFACTION was similar for surgeons (5.0; range 0.7 ±1.0=blood transfusion-10.0 ± 0.0=death) and patients (5.9; range 2.1 ± 2.3=UTI- 9.0 ± 2.8=death; p=0.22). Mean LIFE was significantly lower for surgeons (4.8; range 1.0 ±1.0=UTI, to 10.0 ± 0.0=death) than patients (6.3; range 1.8± 2.3=UTI, to 9.5 ± 1.0=stroke; p<0.05). Patients perceived blood transfusion, deep vein thrombosis, dural tear, heart attack, lung failure, pulmonary embolus, and stroke significantly worse on all measures (SEVERITY, SATISFACTION, and LIFE) than surgeons (p<0.05). Patient and surgeon scores for dural tear and blood transfusion demonstrated the greatest discrepancy in all measures. Conclusion: Perioperative complications may worsen patient outcomes and have medicolegal consequences. We found significant variation between surgeon and patient perceptions of spine surgery complications. Patients believed complications would have more severe impact on satisfaction and quality of life. This discrepancy highlights potential need for improved surgeon communication and patient education. Future research will compare these results to patients incurring complications.