Evidence map›Paper›PMID 36046261›Full record

ArticleFrontiers in surgery2022

Risk factors for hidden blood loss in unilateral biportal endoscopic lumbar spine surgery.

Sijia Guo, Haining Tan, Hai Meng, Xiang Li, Nan Su, Linjia Yu, Jisheng Lin, Ning An, Yong Yang, Qi Fei

Abstract read
In one paragraph

Article in Frontiers in surgery, 2022. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Cited by 19 papers, 2 of them syntheses that pooled it.

0numbers the graph read from it
0cells of the map it votes in
19citing papers in PubMed, 2 pooled it
–field-weighted citation impact
1 · What the graph read from it

What it found

Each row is one number read from the abstract, on the scale the paper reported it, with its interval. Left of the dashed line favours the treatment, right favours the comparator. Under each row is the sentence it came from. New to these charts? A ten-minute tutorial.

The abstract states no effect estimate the extractor could read, or names no intervention and outcome on the map, so this paper lights no cell and moves no belief. It is still indexed, cited and linked below.

2 · The registry

The trial behind it

Trials whose registry record cites this paper, or whose number appears in the abstract. A trial that started after this paper was published is citing it as background, not reporting it.

Neither the registry nor the abstract names a trial number. If this is a trial report, that itself is worth knowing.

3 · Its place in the literature

Who cites it

19 citing papers in PubMed, 2 syntheses or guidelines pooled it.

  1. Modifiable risk factors for perioperative hidden blood loss in unilateral biportal endoscopic surgery: a systematic review and meta-analysis.Wideochirurgia i inne techniki maloinwazyjne = Videosurgery and other miniinvasive techniques · 2025
    Pooled it
  2. Unilateral biportal endoscopic discectomy versus microdiscectomy for lumbar disc herniation: a systematic review and meta-analysis.European spine journal : official publication of the European Spine Society, the European Spinal Deformity Society, and the European Section of the Cervical Spine Research Society · 2024
    Pooled it
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4 · The record

Corrections and comments

PubMed lists nothing against this paper. Absence here is not a guarantee, only a check that was made.

5 · Who and what money

Authors and funding

10 authors.

Sijia GuoDepartment of Orthopedics, Beijing Friendship Hospital, Capital Medical University, Beijing, China.
Haining TanDepartment of Orthopedics, Beijing Friendship Hospital, Capital Medical University, Beijing, China.
Hai MengDepartment of Orthopedics, Beijing Friendship Hospital, Capital Medical University, Beijing, China.
Xiang LiDepartment of Orthopedics, Beijing Friendship Hospital, Capital Medical University, Beijing, China.
Nan SuDepartment of Orthopedics, Beijing Friendship Hospital, Capital Medical University, Beijing, China.
Linjia YuDepartment of Orthopedics, Beijing Friendship Hospital, Capital Medical University, Beijing, China.
Jisheng LinDepartment of Orthopedics, Beijing Friendship Hospital, Capital Medical University, Beijing, China.
Ning AnDepartment of Orthopedics, Beijing Friendship Hospital, Capital Medical University, Beijing, China.
Yong YangDepartment of Orthopedics, Beijing Friendship Hospital, Capital Medical University, Beijing, China.
Qi FeiDepartment of Orthopedics, Beijing Friendship Hospital, Capital Medical University, Beijing, China.

Funding

No grant is acknowledged in the PubMed record.

6 · The paper itself

Abstract

Background: Unilateral biportal endoscopic (UBE) spine surgery is a minimally invasive procedure for treating lumbar disorders. Hidden blood loss (HBL) is easily ignored by surgeons because blood loss is less visible. However, there are limited studies on HBL in UBE spine surgery. This study aimed to evaluate HBL and its possible risk factors in patients undergoing UBE spine surgery. Methods: Patients with lumbar disc herniation or lumbar spinal stenosis who underwent unilateral biportal endoscopic surgery between December 2020 and February 2022 at our hospital were retrospectively analyzed. Patient demographics, blood loss-related parameters, and surgical and radiological information were also collected. Pearson or Spearman correlation analysis was conducted to determine the association between clinical characteristics and HBL. Multivariate linear regression analysis was used to determine the independent risk factors for HBL. Results: Fifty-two patients (17 males and 35 females) were retrospectively enrolled in this study. The mean total blood loss (TBL) volume was 434 ± 212 ml, and the mean HBL volume was 361 ± 217 ml, accounting for 77.9% of the TBL in patients who underwent UBE surgery. Multivariate linear regression analysis revealed that HBL was positively associated with operation time ( Conclusions: The amount of HBL in patients undergoing UBE surgery should not be neglected. Operation time and paraspinal muscle thickness at the target level may be independent risk factors for HBL.

Indexed as

hidden blood loss (HBL)lumbar disorderminimally invasive spine surgeryrisk factorsunilateral biportal endoscopy (UBE)

Identifiers

PMID36046261
PMCPMC9420975

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Registered trials

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Read under generation 80e0d062 · epoch 390. Bibliography from PubMed, PubMed Central and OpenAlex; grants from NIH RePORTER; trial links from ClinicalTrials.gov; estimates, votes and beliefs from the OpenQuestion graph.