Mini Gastric Bypass Surgery vs Duodenal Switch Surgery Comparison

Gastric Bypass vs Duodenal Switch

Choosing between mini-gastric bypass vs duodenal switch surgery is an unusually difficult decision.

Especially when they are both incredibly successful when it comes to their expected weight loss and reduction of obesity-related comorbidities. In order to make an informed decision, we separate the mini gastric bypass vs duodenal switch to educate consumers on the best choice for you. It is important to know all the advantages, benefits, disadvantages, and what to expect from each type of weight loss procedure.

Mexico Bariatric Center analyzed the pros and cons, expected results, and long-term weight loss you can expect for both mini gastric bypass surgery and duodenal switch surgery. So let’s dive in!

How Mini Gastric Bypass Surgery Works

Mini Gastric Bypass surgery is an effective weight loss procedure that forms a new, small stomach pouch that is shaped like a tube. The new stomach bypasses about 20% (2 to 7 feet) of the small intestine, primarily the duodenum section. The mini-gastric bypass resumes digestion within the jejunum.

Mini Gastric Bypass Surgery in Detail
  • Less Invasive Surgery

  • Comparable Expected Weight Loss

  • Less Rerouting of Intestines

  • Single Anastomosis (Connection) to Intestines

Ever since 1994, gastric bypass has been performed and perfected, allowing researchers to study the long-term results. This allows patients the peace of mind to choose a well-established weight loss surgery.

How Duodenal Switch Surgery Works

The Duodenal Switch surgery removes about 70% of the stomach, leaving behind a new, sleeve-shaped stomach. The new stomach is “switched” to the last 40% of the small intestines. The duodenal switch resumes connection within the common channel of the small intestines to continue digestion.

Duodenal Switch Surgery Schematic
  • Highest Amount of Excess Weight Loss (%EWL)

  • Highest Reduction in Comorbidities and Health-Related Problems

  • Intestines “Switched”

  • Double Anastomosis (Connection) to Intestines

Duodenal switch is the most complicated weight loss surgery that is similar to gastric bypass but with less practicing surgeons.

Which Procedure is Best for Me?

The notable difference between these two operations is that mini-gastric bypass surgery has altered the anatomy through one connection to the intestine, while duodenal switch surgery uses two connections. These connection points are called “anastomosis.”

Apart from that, the mini-gastric bypass provides slightly less expected excess weight loss (%EWL) than the duodenal switch.

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Candidacy Requirements

Do I Qualify for Mini Gastric Bypass?

Do I Qualify for Duodenal Switch?

  • BMI 40+

  • Type 2 Diabetes or Hypertension

  • Previous Ulcer

  • Dedicated to Following Strict Lifelong Habits

What is the Biggest Difference?

To start off, the mini gastric bypass works by creating a small stomach pouch (about 1/20-30cc). This pouch, known as the stoma, is connected to the small intestine where food and digestive juices are separated for the first 3 to 5 feet. The RNY significantly restricts the volume of food that can be eaten.

In duodenal switch surgery, a vertical sleeve-shaped stomach pouch is created (about 4-5 oz or 120-150cc) by removing 70% of the stomach size. The duodenum (first portion of the small intestine) is attached to the last 6 feet of the small intestine, where food and digestive juices are rejoined after 12 feet. Moderate restriction of the volume of food that can eat. Provides moderate malabsorption of fat, which can cause bloating and diarrhea.

Changes to Intestine (Single vs Double Anastomosis)

Mini Gastric Bypass = Single Anastomosis: The stomach uses a single connection to the small intestine, known as single anastomosis.

Duodenal Switch = Double Anastomosis: New stomach is “switched,” to the last 6 feet of the small intestines around to alter the digestion process and limit food absorption. Uses double anastomosis, or connections to the small intestines.

Overall Results

The mini bypass is less complicated because of only one single connection to the intestines. The new stomach will hold between 4-6 ounces of food instead of an average of 40 ounces. Patients maintained a 65% loss of excess body weight 2 years after mini-gastric bypass surgery. Unfortunately, this procedure is newer with less long-term weight loss data.

The duodenal switch efficacy is effective for patients with a BMI of > 50kg/m2. Those with a BMI of <45kg/m2 may lose too much weight. It does have a higher incidence of complications than any other weight loss surgery. Two years after surgery, patients maintained a 79% loss of excess body weight. 9% (at 1 year) and 6% (at 2 years) of patients had failed to lose at least 50% of their excess weight.

Statistics Breakdown

  • Highest Amount of Excess Weight Loss (%EWL) – Duodenal Switch Surgery (DS)
  • Less Invasive Surgery – Mini Gastric Bypass Surgery (MGB)
  • Low Complication Rate – Mini Gastric Bypass Surgery
  • Less Number of Potential Side Effect – Mini Gastric Bypass Surgery
  • Lowest Cost of Procedure –  Mini Gastric Bypass Surgery in Tijuana, Mexico
  • Highest Reduction in Comorbidities and Health-Related Problems – Duodenal Switch Surgery (DS)
  • Most Popular Surgery: Mini Gastric Bypass Surgery (MGB) as of now

Table Comparison: Mini Gastric Bypass versus Duodenal Switch

Mini Gastric BypassDuodenal Switch
MethodRestrictive & MalabsorptiveRestrictive & Malabsorptive
StomachNew Pouch: Stoma
(1 oz.)
Reduce 70% size
(4-5 oz.)
AnatomyBypass/Reroute
Single Anastomosis
Switched Intestines
Double Anastomosis
Duration1.5 – 2.5 hours4 hours
Hospital2 to 3 days3 to 4 days
Time Off2 to 3 weeks3 to 4 weeks
Recovery3 to 4 weeks3 to 6 weeks
AdvantageSingle Connection
Fewer Complications
Higher %EWL
More Effective
DisadvantageDumping Syndrome
Hard to Revise
Not Reversible
Leak, Bleed, Vomit
Most Complications
Vitamins Required
Not Revisable
Frequent Bowel Movements
Weight Loss65-84% (%EWL)75-100% (%EWL)
Post-Op3 to 5 Meals/Day
Avoid Sugar and Fats
Vitamin Supplements
3 to 5 Meals/Day
800-1200 Cal
Strict Vitamins
Cure RateT2DM: 68%
HTN: 45%
GERD: 56%
OSA (CPAP): 77%
T2DM: 82%
HTN: 67%
GERD: 56%
OSA (CPAP): 92%
CandidacyBMI of 35+
“Sweet Tooth”
Severe Acid Reflux
BMI of 45+
Last Resort
  • (%EWL) = % Excess Weight Loss

  • T2DM = Type 2 Diabetes Mellitus
  • HTN = Hypertension

  • OSA = Obstructive Sleep Apnea

Comparing Costs and Insurance Coverage

Mexico Bariatric Center is located just across the border in Tijuana, Mexico. MBC strives to offer the most affordable, quality, and reliable all-inclusive packages to medical tourists around the world. Our cost of Mini Gastric Bypass Surgery in Mexico start at $5,995.

Duodenal switch surgery costs anywhere from $6,000 to $35,000 around the world. At Mexico Bariatric Center, we pioneered the duodenal switch surgery in Mexico and have some of the most highly trained surgeons specializing in duodenal switch surgery. Our price is only $6,995.

The criteria for bariatric surgery insurance coverage follows strict guidelines for patients who get accepted. The process takes at least one year just to be approved by most insurance providers. Patients must follow the pre-op diet, fail a strict diet program, and meet with many medical professionals, psychologists, and a dietitian before approval.

Mini Bypass vs Duodenal Switch Cost Comparison

Complications and Side Effects

Complications After Mini Gastric Bypass

There are many fewer complications associated with mini gastric bypass vs duodenal switch surgery. The risks and complications include excessive/internal bleeding, infection, blood clots, dumping syndrome, malnutrition, and ulcers.

Complications After Duodenal Switch

As a newer bariatric procedure, the DS has a variety of complications that occur more often due to less experienced surgeons. The duodenal switch complications include nutrition deficiency, leakage, infection, hemorrhaging, blood clots, and protein malabsorption.

  • Excessive bleeding (~2% to ~6%)

  • Infection (~2% to 4%)

  • Adverse reactions to anesthesia (~1.2%)

  • Blood clots (2%)

  • Leaks in the gastrointestinal system (~3% to 6%)

Digestive Tract and Anatomy