Endothelial Function in Obese Patients Treated with Bariatric Surgery.

Area of Science:

• Cardiovascular Science
• Metabolic Disorders
• Surgical Innovation

Background:

• Bariatric surgery (BS) is a common treatment for morbid obesity, reducing mortality and cardiovascular (CV) risk.
• Endothelial dysfunction is a key factor in atherosclerosis and a predictor of CV events.
• Previous studies on BS effects on endothelial function yield controversial results.

Purpose of the Study:

• To investigate the impact of weight loss following BS on endothelial function.
• To compare endothelial function changes in obese patients after BS versus medical nutrition treatment (MNT).

Main Methods:

• Seventeen obese patients undergoing BS and 18 obese patients undergoing MNT were studied.
• Endothelial function was assessed using flow-mediated dilation (FMD) of the brachial artery.
• Carotid intima-media thickness (c-IMT) was measured to evaluate subclinical atherosclerosis.

Main Results:

• The BS group achieved 18.8% weight loss, significantly more than the MNT group's 7.0%.
• FMD significantly decreased in the BS group (P=0.04) but remained unchanged in the MNT group (P=0.41).
• Endothelial function decline in the BS group correlated negatively with c-IMT changes (r=-0.63; P<0.007).

Conclusions:

• Bariatric surgery resulted in significant endothelial dysfunction, whereas MNT did not.
• The observed decline in endothelial function post-BS may contribute to atherosclerosis.
• Weight loss via BS impacts endothelial health differently than MNT.