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Roux-en-Y Gastric Bypass Operation in Rats
Published on: June 11, 2012
Gastric bypass reduces biochemical cardiac risk factors
D Brandon Williams1, Judith C Hagedorn, Elise H Lawson
1Department of Surgery, Stanford School of Medicine, 300 Pasteur Drive, H3680, Stanford, CA 94305-5655, USA.
Insights
Gastric bypass surgery significantly improves cardiac risk factors, including cholesterol and C-reactive protein levels, in obese patients. This procedure reduces cardiovascular disease risk through weight loss and favorable biochemical changes.
Area of Science:
- Cardiovascular Medicine
- Bariatric Surgery
- Metabolic Health
Background:
- Coronary artery disease (CAD) is a leading cause of death in the US, with obesity as a major preventable risk factor.
- Biochemical markers are critical predictors of cardiovascular events.
- Gastric bypass surgery is investigated for its potential to improve cardiac risk factors beyond weight reduction.
Purpose of the Study:
- To evaluate the impact of gastric bypass surgery on biochemical cardiac risk factors.
- To assess changes in lipid profiles, C-reactive protein, and homocysteine levels post-surgery.
- To determine if gastric bypass offers benefits beyond weight loss for cardiovascular risk.
Main Methods:
- A prospective study at a single academic institution (2003-2004).
- Measurement of biochemical cardiac risk factors in 356 gastric bypass patients preoperatively and at 3, 6, and 12 months postoperatively.
- Analysis included total cholesterol, HDL, LDL, lipid ratios, triglycerides, lipoprotein A, hs-CRP, and homocysteine using the Wilcoxon signed rank test.
Main Results:
- Significant improvements were observed in all measured biochemical cardiac risk factors at 12 months post-gastric bypass.
- Key improvements included reductions in total cholesterol, LDL cholesterol, triglycerides, and hs-CRP (80% reduction).
- Positive changes were also noted in HDL cholesterol, lipid ratios, lipoprotein A, and homocysteine levels.
Conclusions:
- Gastric bypass surgery significantly improves all biochemical markers associated with CAD risk.
- The procedure effectively decreases cardiac risk through substantial weight loss and beneficial alterations in cardiac risk factors.
- Particular improvement was noted in high-sensitivity C-reactive protein levels, indicating reduced inflammation.
Background:
Coronary artery disease (CAD) is the leading cause of death in the United States, with obesity as a leading preventable risk factor for CAD. Certain biochemical markers have demonstrated strong prediction for cardiovascular events. We hypothesized that in addition to weight reduction, gastric bypass will also induce a salutary effect on the biochemical cardiac risk factors.
Methods:
At a single academic institution, from 2003 to 2004, we measured the biochemical cardiac risk factors in gastric bypass patients preoperatively and at 3, 6, and 12 months postoperatively. These risk factors included total cholesterol, high-density lipoprotein (HDL) cholesterol, low-density lipoprotein cholesterol, total cholesterol/HDL cholesterol ratio, triglyceride/HDL cholesterol ratio, triglycerides, lipoprotein A, high-sensitivity C-reactive protein, and homocysteine. The data were analyzed using the Wilcoxon signed rank test.
Results:
The mean age of the 356 patients was 43 years; 84% were women; the mean body mass index was 47 kg/m(2); 33% were diabetic; 50% were hypertensive; 23% were taking lipid-lowering medications; and 2% had known CAD. Significant improvement occurred in the biochemical cardiac factors from preoperatively to 12 months. The beneficial changes were as follows: total cholesterol, 192 mg/dL preoperatively to 166 mg/dL at 12 months; HDL cholesterol, 46 mg/dL preoperatively to 54 mg/dL at 12 months; low-density lipoprotein, 125 mg/dL preoperatively to 88 mg/dL at 12 months; total cholesterol/HDL cholesterol ratio, 4 preoperatively to 3 at 12 months; triglyceride/HDL cholesterol ratio, 3 preoperatively to 2 at 12 months; triglycerides, 133 mg/dL preoperatively to 92 mg/dL at 12 months; lipoprotein A, 14 mg/dL preoperatively to 13 mg/dL at 12 months; high-sensitivity C-reactive protein, 8 mg/L preoperatively to 1 mg/L; and homocysteine, 10 mumol/L preoperatively to 8 mumol/L at 12 months.
Conclusions:
The results of our study have shown that gastric bypass significantly improves all biochemical markers of CAD risk, particularly C-reactive protein, which had an 80% reduction. As a result, gastric bypass decreases the cardiac risk by both weight loss and advantageous alterations of biochemical cardiac risk factors.
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