Related Experiment Video
Updated: Jul 28, 2025
10:05
Techniques of Sleeve Gastrectomy and Modified Roux-en-Y Gastric Bypass in Mice
Published on: March 20, 2017
12.1K
Severe Anemia in Sprague-Dawley Rats After Roux-en-Y Gastric Bypass Surgery.
Rachel L Griffin1, Ashley N Varley1, Andras Hajnal2
1Pennsyvania State University College of Medicine, Department of Comparative Medicine, Hershey, Pennsylvania.
Comparative Medicine
|May 31, 2023
Summary
Roux-en-Y gastric bypass surgery in rats can lead to severe anemia, a complication not previously reported in this model. Researchers should monitor for anemia and establish humane endpoints.
Area of Science:
- Bariatric Surgery Research
- Animal Models in Medicine
- Gastrointestinal Physiology
Background:
- Roux-en-Y gastric bypass (RYGB) is a common bariatric procedure for human weight loss.
- RYGB complications include gastrointestinal issues, malnutrition, and anemia.
- Severe anemia has not been previously reported in rat models of RYGB.
Purpose of the Study:
- To investigate the frequency and severity of anemia following RYGB surgery in rats.
- To document clinical and pathological findings associated with anemia post-RYGB in rats.
- To raise awareness among researchers about potential anemia complications in RYGB rat models.
Main Methods:
- Performed RYGB and sham surgeries on female Sprague-Dawley rats.
- Conducted blood work and necropsies on surgical and control groups.
- Analyzed hematological parameters and organ weights.
Main Results:
- Observed 3 cases of severe anemia in rats after RYGB surgery.
- Anemic rats exhibited pallor, pale internal organs, and eccentric heart enlargement.
- Anemia types included macrocytic normochromic (B12/folate deficiency) and microcytic hypochromic (iron deficiency).
Conclusions:
- Severe anemia is a potential complication of RYGB surgery in rats.
- RYGB rats showed increased heart:body weight ratio compared to sham controls.
- Recommendations include developing diagnostic and management strategies for anemia in RYGB rat studies.
