Impact of Preoperative Anemia on Postoperative Kidney Function Following Laparoscopic Bariatric Surgery

  • Kuo-Chuan Hung
  • Shao-Chun Wu
  • Ying-Jen Chang
  • Min-Hsien Chiang
  • I-Wen Chen
  • Cheuk-Kwan Sun
  • Tien-Chou SoongEmail author
Original Contributions



Preoperative anemia is a risk factor for acute kidney failure after high-risk surgeries. We assessed the impact of preoperative anemia on kidney function in an obese Asian population after laparoscopic bariatric surgery.


Patient characteristics, comorbidities, type of surgery, perioperative profiles, eGFR, and micronutrition were retrospectively reviewed in 341 patients with obesity undergoing bariatric surgery. All patients, who had a preoperative estimated glomerular filtration rates (eGFR) ≥ 90 mL/min/1.73 m2, were followed for 1 year and assigned to one of two groups: anemia or non-anemia group. Preoperative anemia was determined based on hemoglobin concentration.


The Pearson’s correlation coefficient between preoperative body mass index (BMI) and preoperative eGFR of all patients was 0.169 (p = 0.005). Preoperatively, there were no significant differences in age, BMI, and eGFR between the anemia (n = 38) and non-anemia groups (n = 303). Patients in the anemia group had lower hemoglobin concentration at baseline, 1 month, and 12 months after surgery than those in the non-anemia group. Postoperative eGFR levels at 1 month (p = 0.993) and 1 year (p = 0.118) as well as hospital stay (p = 0.941) were comparable between the two groups. However, the percentage weight loss was significantly higher in the non-anemia group than that in the anemia group 1 year after bariatric surgery (30.0 ± 7.3% vs. 27.0 ± 8.1%; p = 0.041).


Preoperative anemia did not negatively impact kidney function following laparoscopic bariatric surgery during the 12-month follow-up. Considering the potential adverse impact of anemia on postoperative weight loss, preoperative correction of anemia may be recommended.


Bariatric surgery Glomerular filtration rate Renal function 


Compliance with Ethical Standards

The protocol of the whole study was reviewed and approved by the institutional research board (IRB) (Approval No. 20181119B). Informed patient consent was waived due to the retrospective nature of this study.

Conflict of Interest

The authors declare that they have no conflict of interest.

Ethical Approval

All procedures performed in studies involving human participants were in accordance with the ethical standards of the institutional and/or national research committee and with the 1964 Helsinki Declaration and its later amendments or comparable ethical standards.

Informed Consent

This article does not contain any studies with human participants or animal performed by any of the authors. For this type of study, formal consent is not required. Informed consent does not apply to the submission.


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Copyright information

© Springer Science+Business Media, LLC, part of Springer Nature 2019

Authors and Affiliations

  1. 1.Department of AnesthesiologyChi Mei Medical CenterTainanTaiwan
  2. 2.Department of Anesthesiology, Kaohsiung Chang Gung Memorial HospitalChang Gung University and College of MedicineKaohsiungTaiwan
  3. 3.Department of Emergency Medicine, E-Da Hospital, School of Medicine for International StudentsI-Shou UniversityKaohsiungTaiwan
  4. 4.Weight Loss and Health Management CenterE-Da Dachang HospitalKaohsiung CityTaiwan

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