Abstract:Objective To evaluate the amount of hidden blood loss after the cervical spine posterior open-door laminoplasty and to identify the associated factors that may contribute to HBL.Methods The clinical data of 55 patients who underwent the cervical spine posterior open-door laminoplasty from February 2018 to July 2020 were analyzed retrospectively.Finally,51 patients met all the inclusion criteria.Hematocrit was recorded before and after the operation,whereafter,the HBL was calculated according to Sehat formula.Meanwhile,multivariate linear regression analysis was used to further analyze the risk factors,including age,sex,height,weight,body mass index,plasma albumin,glucose,American Society of Anesthesiologists score and operation time.Results 30 males and 21 females,average aged(59.90±9.75)years.The HBL was (230.29±169.70)mL,with a percentage of(35.1±25.1)% in the totalblood loss after surgery.Multivariate linear regression analysis showed that sex and operation time had significant influence on HBL,which were independent risk factors.The HBL of male patients was(283.11±194.68)mL,which was significantly higher than that of female patients,mean(154.82±82.91)mL,P=0.034.The time of operation was positively correlated with the amount of occult blood loss.Conclusion The HBL accounts for a large proportion of the total blood loss after the cervical spine posterior open-door laminoplasty.Male patients and longer duration of surgery were independent risk factors for HBL.Age,height,weight,BMI,ALB,GLU,ASA score were not associated with hidden blood loss.
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