science

Sleeve gastrectomy

Sleeve gastrectomy is a science topic covered in the lgStudy science library. This page brings together a partial reference excerpt, illustrations, worked examples, real-world applications and a short study plan, so you can understand Sleeve gastrectomy rather than just read about it. In short: Sleeve gastrectomy or vertical sleeve gastrectomy, is a surgical weight-loss procedure, typically performed laparoscopically, in which approximately 75 — 85% of the stomach is removed, along the greater curvature, which leaves a cylindrical, or "sleeve"-shaped stomach the size of a banana. Weight loss is affected not only through the reduction of the organ's size, but also by the removal of the portion of it that pr…

Key takeaways

Sleeve gastrectomy belongs to science; place it in that map before memorising details.
Learn the definition first, then one example that makes the definition concrete.
Connect Sleeve gastrectomy to a quantity you can measure, compute or draw — that is where exam questions come from.
Reproduce the core statement of Sleeve gastrectomy from memory before moving on to harder problems.

Reference excerpt

Sleeve gastrectomy or vertical sleeve gastrectomy, is a surgical weight-loss procedure, typically performed laparoscopically, in which approximately 75 — 85% of the stomach is removed, along the greater curvature, which leaves a cylindrical, or "sleeve"-shaped stomach the size of a banana. Weight loss is affected not only through the reduction of the organ's size, but also by the removal of the portion of it that produces ghrelin, the hormone that stimulates appetite. Patients can lose 50-70 percent of excess weight over the course of the two years that follow the surgery. The procedure is irreversible, though in some uncommon cases, patients can regain the lost weight, via resumption of poor dietary habits, or dilation of the stomach over time, which can require gastric sleeve revision surgery to either repair the sleeve or convert it to another type of weight loss method that may produce better results, such as a gastric bypass or duodenal switch. A meta-analysis of 174,772 participants published in The Lancet in 2021 found that bariatric surgery was associated with 59% and 30% reduction in all-cause mortality among obese adults with and without type 2 diabetes, respectively. This meta-analysis also found that median life-expectancy was 9.3 years longer for obese adults with diabetes who received bariatric surgery as compared to routine (non-surgical) care, whereas the life expectancy gain was 5.1 years longer for obese adults without diabetes.

Procedure Sleeve gastrectomy was originally performed as a modification to another bariatric procedure, the duodenal switch, and then later as the first part of a two-stage gastric bypass operation on extremely obese patients for whom the risk of performing gastric bypass surgery was deemed too great. The initial weight loss in these patients was so successful it began to be investigated as a stand-alone procedure. Sleeve gastrectomy is the most commonly performed bariatric surgery worldwide. In many cases, sleeve gastrectomy is as effective as gastric bypass surgery, including improvements in glucose homeostasis before substantial weight loss has occurred. This weight-loss independent benefit is related to the decrease in gastric volume, changes in gut peptides, and expression of genes involved in glucose absorption.

The procedure involves a longitudinal resection of the stomach starting from the antrum at a point 5–6 cm from the pylorus and finishing at the fundus close to the cardia. The remaining gastric sleeve is calibrated with a bougie. Most surgeons prefer to use a bougie between 36 and 40 Fr with the procedure and the ideal approximate remaining size of the stomach after the procedure is about 150 mL.

Use in children and adolescents Endorsed by the International Federation for the Surgery of Obesity and Metabolic Disorders and the American Society for Metabolic and Bariatric Surgery, sleeve gastrectomy is gaining popularity in children and adolescents. Studies by Alqahtani and colleagues have found that sleeve gastrectomy causes large weight loss in children and adolescents aged 5 to 21 years. Moreover, they compared weight loss with adults and found comparable weight loss. A study published in 2016 showed that growth progresses were unaffected after sleeve gastrectomy in children younger than 14 years of age. Depression following the procedure has been noted in some individuals. Another side effect is insomnia. After this surgery many people can only sleep when they take melatonin or sleeping medications.

Complications

Sleeve gastrectomy may cause complications; some of them are listed below:

Sleeve leaking (occurs 1 in 200 patients) Blood clots (happens 1% of the time) Wound infections (occurs in about 10 to 15% of post-op patients) Strictures (occurs in 3.5% of post-op patients) Aversion to food, and nausea Damage to the vagus nerve which will cause constant nausea Gastroparesis, with a delay in moving food from the stomach to the small intestine Vomiting Internal bleeding Esophageal spasm/pain Gastroesophageal Reflux Disease (GERD) Lack of gastric intrinsic factor result in vitamin B12 deficiency Depression after surgery Reduced bone health Weight regain

References

Illustrations

Worked examples

Example 1 — a first encounter with Sleeve gastrectomy

Start with the simplest possible case. Write down what Sleeve gastrectomy claims or describes in one sentence, then invent the smallest concrete situation in which that sentence is true. In science, the smallest case is usually a single object, a single equation or a single measurement. Check that every symbol or term in your sentence has a meaning in that case.

Example 2 — changing one variable

Take the situation from Example 1 and change exactly one quantity: double it, halve it, or set it to zero. Predict what should happen to Sleeve gastrectomy before you calculate. Comparing your prediction with the result is the fastest way to find out whether you understand the idea or only the words.

Example 3 — an exam-style question

Typical questions about Sleeve gastrectomy ask you to (a) state it precisely, (b) apply it to given data, and (c) explain a limitation. Practise writing all three answers in under five minutes; the third part is what separates a full-mark answer from an average one.

Applications of Sleeve gastrectomy

In research: Sleeve gastrectomy appears in science research whenever the underlying quantities have to be modelled precisely. Papers usually cite it as a starting assumption and then explore where it breaks down.
In technology and industry: Engineering practice reuses Sleeve gastrectomy in design rules, simulations and safety margins. Knowing the idea lets you read a specification sheet and understand why the numbers look the way they do.
In the classroom: Sleeve gastrectomy is common in secondary-school and first-year university syllabi. It links to neighbouring topics Bariatric surgery, Digestive system procedures, Surgical removal procedures, so understanding it makes those chapters shorter.
In everyday life: Look for Sleeve gastrectomy outside the textbook — in sport, cooking, traffic, electronics or the sky above you. An example you found yourself is remembered far longer than one you were given.

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How to study Sleeve gastrectomy in 20 minutes

Read the reference excerpt below once, without taking notes.
Close the page and write down what Sleeve gastrectomy means in your own words.
Compare your version with the excerpt and mark what you missed.
Work through the three examples above with pen and paper.
Explain Sleeve gastrectomy out loud to somebody else — or to Teacher Smith in the lgStudy chat.

Frequently asked questions

What is Sleeve gastrectomy in simple terms?

Why does Sleeve gastrectomy matter?

Because it connects several science ideas at once: it gives you a definition you can apply, a quantity you can calculate, and a way to check whether a result is plausible.

How should I study Sleeve gastrectomy?

Read the excerpt, restate it from memory, then work through the examples and applications listed on this page. The five-step study plan above takes about twenty minutes.

What does this page cover?

It gives you a compact reference excerpt plus original lgStudy explanations, examples, applications and study material on Sleeve gastrectomy.