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Published on: June 11, 2012
Early changes in cognitive function following bariatric surgery: evidence for rapid improvement or practice effects?
Erin Burke1, John Gunstad1, Dale Bond2
1Department of Psychological Sciences, Kent State University, Kent, Ohio.
Summary
Metabolic bariatric surgery (MBS) may improve cognitive function within one month, but early gains might be influenced by practice effects. Lower preoperative BMI may predict better cognitive outcomes after MBS.
Area of Science:
- Neuroscience
- Bariatric Surgery
- Cognitive Function
Background:
- Metabolic bariatric surgery (MBS) is linked to improved neuropsychological test performance.
- Early cognitive gains post-MBS are possible but may be affected by measurement error.
Purpose of the Study:
- To evaluate cognitive function changes one month after MBS.
- To differentiate true cognitive improvement from practice effects.
Main Methods:
- 111 MBS participants completed the NIH Toolbox cognitive test battery pre- and post-surgery.
- Statistical analyses included repeated measures ANCOVA and ROC analysis.
Main Results:
- Cognitive test scores improved significantly after both Roux-en-Y gastric bypass (RYGB) and sleeve gastrectomy (SG).
- Practice effects could not be ruled out as a contributor to score improvements.
- Lower preoperative BMI was associated with a higher likelihood of true cognitive improvement post-MBS.
Conclusions:
- Early postoperative cognitive improvements after MBS should be interpreted cautiously.
- Preoperative BMI may predict cognitive trajectory following MBS.
- Further research is needed to clarify the timeline of neurological changes and MBS's impact on cognitive decline risk.
