Study finds, Risk Factors for Perioperative Hidden Blood Los
Hidden blood loss (HBL) represents an important complication of unilateral biportal endoscopic (UBE) spine surgery. A Study was conducted to evaluate HBL and its possible risk factors among patients undergoing UBE surgery for lumbar degenerative diseases.

Data of patients who underwent UBE surgery were extracted by electronic medical record system. The patient’s demographic characteristics and blood loss-related parameters were recorded. Researchers calculated the amount of HBL and explored the association between patient’s characteristics and HBL.

--A total of 136 patients were included in this study.

--A substantial amount of HBL occurred following UBE surgery.

--Multiple linear regression analysis indicated that the risk factors of HBL were as follows: age, number of fusion levels, American Society of Anesthesiologists (ASA) classification, surgery time, patient’s blood volume, total blood loss, postoperative hematocrit, Hct loss, and fibrinogen.

Conclusively, a certain amount of HBL occurs during UBE surgery and should not be overlooked in clinical practice. HBL is caused by a combination of factors including age, number of fusion levels, ASA classification, operation time, PBV, TBL, postoperative Hct, Hct loss, and fibrinogen.