Post-Bariatric Hypoglycemia Is Associated with Endothelial Dysfunction and Increased Oxidative Stress

Area of Science:

• Cardiovascular Science
• Endocrinology
• Metabolic Surgery

Background:

• Post-bariatric hypoglycemia (PBH) is a recognized complication following bariatric surgery.
• Recurrent hypoglycemia may negatively impact vascular health.
• Understanding the specific effects of PBH on endothelial function and oxidative stress is crucial for patient management.

Purpose of the Study:

• To assess endothelial function by measuring brachial artery flow-mediated dilation (FMD).
• To evaluate levels of oxidized low-density lipoproteins (oxLDL) and reactive oxygen metabolites (D-ROMs) in patients with PBH.
• To compare these vascular markers between patients with and without PBH.

Main Methods:

• A cross-sectional study comparing 18 patients with PBH (HYPO) to 10 without (NO-HYPO) at least 12 months post-bariatric surgery.
• Seven-day continuous glucose monitoring (CGM) was used to detect hypoglycemia.
• Measurements included brachial artery FMD, oxLDL, and D-ROMs.

Main Results:

• PBH patients exhibited significantly lower FMD (3.8% vs. 10.5%, p < 0.001).
• The HYPO group had higher D-ROMs (416.2 vs. 305.5 UCARR, p < 0.001) and oxLDL (770.5 vs. 725.1 µEq/L, p = 0.035).
• Hypoglycemia duration, event frequency, and nadir glucose correlated with impaired FMD and increased oxidative stress markers.

Conclusions:

• Post-bariatric hypoglycemia is associated with significantly impaired endothelial function.
• Increased oxidative stress, indicated by higher D-ROMs and oxLDL, accompanies PBH.
• PBH independently predicts poorer endothelial function and elevated oxidative stress markers.