Related Experiment Video
Updated: Jan 20, 2026

A Retrospective Study on Endoscopic Surgery for the Treatment of Paravertebral Abscess in Spinal Tuberculosis Patients
Published on: October 25, 2024
Association of preoperative hemoglobin with weight loss after bariatric surgery: a retrospective study
Kuo-Chuan Hung1, Chun-Ning Ho1, Jen-Yin Chen2
1Department of Anesthesiology, Chi Mei Medical Center, Tainan, Taiwan.
Background:
Despite the known positive correlation between exercise and weight loss after bariatric surgery as well as the established association of hemoglobin level with maximal aerobic power and endurance performance, the correlation between preoperative hemoglobin concentration (pre-Hb) and postoperative weight loss remains unknown.
Objective:
This study aimed at assessing the association of pre-Hb with postoperative percentage weight loss (%WL) at 3, 6, 12, and 24 months after surgery.
Setting:
A single tertiary referral center.
Methods:
Outcomes of 282 patients undergoing laparoscopic sleeve gastrectomy at the 4 timepoints within a 24-month follow-up period were assessed. The primary study endpoint was the relationship between pre-Hb and postoperative %WL at 12-month follow-up.
Results:
The 282 patients had a mean preoperative body mass index of 39.0 ± 4.5 kg/m2 with a slight female predominance (57.4%). Follow-up data were available for 221 of 282 (78.4%) patients (mean %WL: 30.9% ± 6.6%) at 1 year. Pearson's correlation showed that pre-Hb correlated positively with post-Hb (r = 0.778, P < .001) and %WL (r = .237, P < .001) at 12-month follow-up but not at 24 months (r = .145, P = .331). Multiple linear regression analyses including baseline variables of age, sex, preoperative body mass index, and diabetes revealed that pre-Hb, age, and preoperative body mass index were independent predictors of %WL. There was no evidence of multicollinearity among these variables.
Conclusion:
The present study showed a potential positive relationship between pre-Hb and postoperative weight loss. More well-designed, large-scale studies are warranted to clarify the effect of hemoglobin level on postoperative weight loss in this patient population.
Related Concept Videos
Hemoglobin
When all four heme groups are bound to oxygen, the resulting molecule is called oxyhemoglobin. As a result, arterial blood...
Genome-wide Association Studies-GWAS
GWAS does not require the identification of the target gene involved in...
Line Loss
Line loss impacts power delivery efficiency in a balanced three-phase circuit. The symmetry in such a circuit simplifies the...
Weighted Mean
For example, consider the number of goals scored in the matches of a tournament. While computing the average number of goals scored in the tournament, it may be more important to...
Reducing Line Loss
With a step-up transformer at the source, the voltage is increased, thereby reducing the current in the transmission lines since power loss in...
Mass and Weight

