Perioperative Factors Associated with Hidden Blood Loss in Patients Received PLIF

Abstract：Objective To preliminarily analyze the correlation between the hidden blood loss and perioperative factors in patients received posterior lumbar intervertebral fusion(PLIF). Methods We retrospectively analyzed 42 patients underwent PLIF surgery in our hospital. The collection date were grouped according to perioperative factors such as gender,age,BMI,ASA grading,surgery level and operation time. And we evaluated the influence of perioperative factors on hidden blood loss by single factor variance analysis and multivariate linear regression. Results The single factor analysis showed the differences of hidden blood loss were statistically significant in the surgery level group and surgery time group(P ﹤ 0. 05). Multivariate linear re-gression model show surgery level was an independent risk factor influencing the hidden blood loss. The hidden blood loss in single level surgery group significantly less than double levels surgery group and multiple level surgery group(P ﹤ 0. 05). However,no obvious difference in ratio of hidden blood loss to total blood loss was observed among different surgery level group.(P ﹥ 0. 05). Conclusion More surgery time may associate with more hidden blood loss. Surgery levels is one of the in-dependent factors affected hidden blood loss in patients received PLIF.