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Greatest total blood loss seen during screw insertion in posterior instrumented spinal fusion for AIS
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Investigators of the study found all stages of posterior instrumented spinal fusion surgery in patients with adolescent idiopathic scoliosis correlated with total blood loss except for exposure and closure, and they found the greatest total blood loss during screw insertion.
Researchers prospectively evaluated blood loss in 100 patients who underwent posterior instrumented spinal fusion surgery for adolescent idiopathic scoliosis. The procedure was divided from stage 1 to stage 6 (exposure, screw insertion, release, correction, corticotomies and bone grafting, and closure, respectively). Investigators recorded the blood loss and duration of each stage. Total blood loss, blood loss per estimated blood volume, blood loss per minute, blood loss per vertebral level fused and blood loss per minute per vertebral level infused were also calculated.
Results showed most patients had Lenke type 1 curves. Investigators noted the mean preoperative Cobb angle was 64.9°. The mean number of fused levels was 9.5. Mean length of surgery was 188.5 minutes, with 951 mL in mean total blood loss.
According to researchers, screw insertion had the greatest mean blood loss, followed by correction and corticotomies and bone grafting. Corticotomies and bone grafting had the greatest mean blood loss per minute, followed by release. At screw insertion, investigators saw the greatest mean blood less per vertebral levels fused, followed by correction. ‒ by Monica Jaramillo
Disclosure: The researchers report no relevant financial disclosures.
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