I would like to share my personal insights regarding the SASI — Single Anastomosis Sleeve-Ileal Bypass procedure. Recently, I analyzed the latest systematic review and meta-analysis, published in 2024, which included results from 26 clinical studies with over 1,800 patients.
What the SASI procedure is, in simple terms
SASI is a combined bariatric surgery that involves two main mechanisms:
- Stomach volume reduction: a "sleeve" is created, which helps the patient eat less.
- Bypass of part of the small intestine: the surgeon creates a special "pathway" for food, bypassing a section of the intestine. This reduces calorie absorption.
Unlike classic gastric bypass surgery, SASI keeps the natural pathway through the duodenum open, which lowers the risk of severe nutrient deficiencies and makes the technique safer.
Results from international studies
Here are the key data points I highlighted from the latest meta-analysis:
| Indicator | At 12 months | At 24 months | Note |
|---|---|---|---|
| Average Excess Weight Loss (%EWL) | ≈ 88–90 % | ≈ 80–82 % | %EWL — percentage of excess weight lost |
| Average Total Weight Loss (%TWL) | ≈ 32–35 % | ≈ 30 % | %TWL — percentage of total body weight lost |
| Type 2 diabetes remission | 78–85 % | 75–80 % | Most patients discontinue medication |
| Hypertension remission | ≈ 65 % | ≈ 60 % | Blood pressure normalizes |
| Lipid profile improvement | +20–35 % | +30 % | LDL decreases, HDL increases |
| Serious complications | ≈ 2.8 % | 3.1 % | Very low rate for bariatric surgery |
Advantages of SASI, in my observation
- High effectiveness: up to 90% excess weight loss within the first year.
- Control of metabolic diseases: type 2 diabetes remission up to 85%, improved lipid metabolism.
- Lower risk of deficiencies: natural intestinal pathway preserved, fewer deficiencies of protein, calcium, and vitamins.
- Relative technical simplicity and reversibility: the procedure can be revised if needed.
Risks and important considerations
No bariatric surgery is a “magic pill.” SASI also requires discipline and monitoring:
- Lifelong intake of vitamins and minerals is mandatory.
- Regular lab monitoring every 3–6 months during the first two years.
- In rare cases, leaks, bleeding, stenosis, or thrombosis can occur, but these are much less frequent than with classic gastric bypass.
Real-life outcomes of my patients after SASI
Below are several illustrative cases showing how patients’ lives change after the procedure:
Case #1. Elena, 38 years old
| Indicator | Before surgery | 6 months | 12 months |
|---|---|---|---|
| Weight | 128 kg | 92 kg | 78 kg |
| BMI | 44 | 31.5 | 27 |
| Glucose level | 6.7 mmol/L | 5.1 mmol/L | 4.9 mmol/L |
| Diabetes medication | Took | Discontinued | None |
| %EWL | — | 65 % | 88 % |
Outcome: One year after SASI, Elena lost 50 kg, her glucose normalized, and she no longer requires medication.
Case #2. Sergey, 45 years old
| Indicator | Before surgery | 6 months | 12 months |
|---|---|---|---|
| Weight | 118 kg | 89 kg | 82 kg |
| BMI | 39 | 29.7 | 27.3 |
| HbA1c | 8.4 % | 6.1 % | 5.5 % |
| Blood pressure | 155/95 | 125/80 | 120/78 |
| Medication | Insulin + tablets | Insulin discontinued | Minimal tablets |
| %EWL | — | 60 % | 85 % |
Outcome: Sergey stopped insulin, stabilized blood pressure, and diabetes entered remission.
Case #3. Marina, 52 years old
| Indicator | Before surgery | 6 months | 12 months |
|---|---|---|---|
| Weight | 104 kg | 80 kg | 72 kg |
| BMI | 36 | 28 | 25.5 |
| Lipid profile (LDL) | 5.2 mmol/L | 3.1 mmol/L | 2.5 mmol/L |
| HDL ("good" cholesterol) | 0.9 mmol/L | 1.3 mmol/L | 1.5 mmol/L |
| Sleep apnea | Severe | Moderate | Resolved |
| %EWL | — | 58 % | 82 % |
Outcome: Lipid profile improved, sleep normalized, sleep apnea disappeared.
My conclusion
The SASI procedure is not just about weight loss; it provides comprehensive improvement in metabolic health:
- Type 2 diabetes remission — up to 85% of cases.
- Normalization of blood pressure — in over 60% of patients.
- Improvement of lipid profile — in most operated patients.
- Reduced risk of cardiovascular diseases and improved quality of life.
It is important to understand that SASI is only a tool. Success depends on the patient’s willingness to change eating habits, increase physical activity, and regularly follow up with specialists.
Author
A bariatric surgeon with many years of experience helping patients improve their health and quality of life.
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