Effect of bariatric surgery on peripheral flow-mediated dilation and coronary microvascular function

Area of Science:

• Cardiovascular Medicine
• Metabolic Surgery
• Vascular Biology

Background:

• Morbid obesity is associated with impaired endothelial and microvascular function, increasing cardiovascular risk.
• Bariatric surgery (BS) is effective for weight loss but its impact on vascular function requires further elucidation.
• Previous studies suggest BS reduces cardiovascular events, but direct evidence on vascular function is limited.

Purpose of the Study:

• To evaluate the effects of bariatric surgery on peripheral endothelial function.
• To assess the impact of bariatric surgery on coronary microvascular dilator function.
• To determine if bariatric surgery leads to a global improvement in vascular health in morbidly obese patients.

Main Methods:

• Study included 50 morbidly obese patients undergoing bariatric surgery and 20 obese controls.
• Peripheral endothelial function assessed via flow-mediated dilation (FMD) of the brachial artery.
• Coronary microvascular function assessed by measuring coronary blood flow (CBF) velocity response to adenosine and cold pressor test (CPT) using Doppler echocardiography.

Main Results:

• At 3-month follow-up, bariatric surgery patients showed significant improvement in FMD (5.9% to 8.8%, p < 0.01).
• Coronary microvascular function significantly improved in bariatric surgery patients, with enhanced CBF response to adenosine (p < 0.01) and CPT (p < 0.01).
• No significant changes in FMD or coronary microvascular function were observed in the control group.

Conclusions:

• Bariatric surgery significantly improves peripheral endothelial function in morbidly obese patients.
• Bariatric surgery also enhances coronary microvascular function, indicating a global improvement in vascular health.
• These vascular improvements likely contribute to the reduced cardiovascular risk observed after bariatric surgery.