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Frequently Asked Questions About
Bariatric Surgery
Clear answers to the most common questions about bariatric surgery, gastric sleeve, gastric bypass, and bariatric revision with Dr. Bladimiro Bula Márquez in Medellín.
01 · General Information
About Bariatric Surgery
Bariatric surgery is a set of surgical procedures designed to treat obesity and associated metabolic diseases by modifying the digestive system. The most commonly performed surgeries are gastric sleeve and gastric bypass, both performed laparoscopically. It is not a “magic solution”: it is a clinically effective tool that requires the patient’s commitment to long-term lifestyle changes.
International standard criteria indicate bariatric surgery for individuals with: a BMI greater than 35 without comorbidities, a BMI between 30 and 35 with at least one associated condition (type 2 diabetes, hypertension, sleep apnea, dyslipidemia), or a BMI greater than 40 in any circumstance. The typical age range is between 18 and 65 years. A comprehensive evaluation with Dr. Bula determines individual eligibility.
Yes. Laparoscopic bariatric surgery is one of the most standardized and safe procedures in modern surgery when performed by an expert team at a high-level institution. The rate of serious complications is 1% to 3%. Untreated obesity carries significantly higher risks than properly performed bariatric surgery. Dr. Bula performs surgeries at Clínica Las Vegas in accordance with all safety protocols.
The entire process from the initial consultation to surgery typically takes 4 to 8 weeks. It includes: initial assessment, pre-surgical tests, nutritional and psychological evaluation, a 7- to 14-day pre-surgical diet, and scheduling the surgery. For international patients, the timeline can be optimized by coordinating tests in their home city.
Bariatric surgery is the most effective tool available to treat severe obesity, but it is not a definitive cure on its own. Obesity is a chronic, multifactorial disease. Long-term results depend on the combination of surgery and the patient’s sustained commitment to changes in eating habits, physical activity, and medical follow-up. Approximately 60–80% of patients maintain their results at 10 years.
02 · Procedures
Which procedure is right for me?
Gastric sleeve surgery reduces the stomach by approximately 80% without altering the intestine—it is ideal for patients with a BMI greater than 30. Gastric bypass surgery reduces the stomach AND reroutes the small intestine, combining restriction with controlled malabsorption—it is indicated for a BMI greater than 35 or in cases of significant type 2 diabetes. See details on sleeve gastrectomy → · See details on bypass →
There is no universally “best” surgery—it depends on the patient. Gastric sleeve surgery is preferable for a BMI between 30 and 40 without poorly controlled diabetes, and for patients who want a simpler procedure without the need for intensive supplementation. Gastric bypass is preferable for a BMI greater than 40, significant type 2 diabetes, severe gastroesophageal reflux, or when maximum metabolic impact is sought. The decision is made during the consultation with Dr. Bula.
Bariatric revision surgery is a procedure performed on patients who have previously undergone bariatric surgery and require additional intervention due to weight regain, technical complications, severe reflux following sleeve gastrectomy, or insufficient weight loss. It may involve conversion (sleeve to bypass), re-sleeve, or technical repair. See details →
In addition to bariatric surgery (sleeve, bypass, and revision), Dr. Bula performs: anti-reflux surgery (fundoplication), laparoscopic cholecystectomy (gallbladder removal), inguinal herniorrhaphy (hernia repair with mesh), hemicolectomy (partial colon resection), appendectomy, and other general laparoscopic surgeries.
The adjustable gastric band is virtually obsolete in modern bariatric surgery due to its high rates of long-term failure and complications requiring removal. Patients with older gastric bands frequently require revision surgery: removal of the band and conversion to gastric sleeve or gastric bypass.
03 · Before Surgery
Pre-surgical preparation
Standard pre-surgical tests include: complete blood work (complete blood count, blood chemistry, lipid profile, liver and kidney function, thyroid profile, vitamins), electrocardiogram, chest X-ray, abdominal ultrasound, upper gastrointestinal endoscopy, and cardiopulmonary evaluation. In specific cases, additional tests are added depending on comorbidities.
The 7- to 14-day pre-surgical diet has a key medical goal: to reduce the size of the liver. The livers of obese patients are often enlarged, which hinders laparoscopic access to the stomach. A low-calorie diet (typically 800–1,200 kcal/day with an emphasis on protein) reduces hepatic glycogen stores, and the liver shrinks in size within a few days, facilitating surgery and reducing risks.
Yes, the psychological evaluation is a standard part of the bariatric assessment. It identifies eating disorders, depression, anxiety, or other factors that could affect the outcome of the surgery. It also prepares the patient for post-operative emotional changes. It is not a test to “pass” or “fail”—it is to ensure that the surgery is performed at the right time and with the right support.
The standard preoperative fasting period is 8 hours for solids and 2 to 4 hours for clear liquids (water, tea without milk, juices without pulp). The specific protocol is provided a few days before surgery. Adhering to the fasting period is essential to prevent anesthetic complications such as pulmonary aspiration.
Some yes, others no. Anti-inflammatory drugs and anticoagulants are generally discontinued 7 to 10 days beforehand (as medically indicated). Diabetes medications may require dose adjustments. Blood pressure medications are usually continued. Never stop taking medications on your own—this is planned during the pre-surgical consultation with Dr. Bula.
04 · The Day of Surgery
What the day is like
The average time in the operating room is 60 to 75 minutes for gastric sleeve surgery and 90 to 120 minutes for gastric bypass surgery. Revision surgery can take between 2 and 4 hours depending on complexity. The entire procedure—including preparation, surgery, and post-anesthesia recovery—typically takes 3 to 5 hours in total.
Bariatric surgery is performed under general anesthesia, supervised by a board-certified anesthesiologist specializing in bariatric patients. The patient is completely asleep throughout the procedure and continuously monitored (heart rate, blood pressure, oxygen saturation, temperature, carbon dioxide).
Typically, 5 to 6 small incisions, each between 5 and 12 millimeters, are made across the upper abdomen. The laparoscope (HD camera) and surgical instruments are inserted through these incisions. There is no large abdominal incision as in traditional open surgery.
No. Under general anesthesia, you are completely asleep and feel no pain during the surgery. Postoperative pain management is a priority: it includes scheduled intravenous analgesia, anti-inflammatory medications, and, as needed, additional pain relief. Most patients describe post-surgical pain as moderate and well-controlled.
Surgeries are performed at Clínica Las Vegas, located at Cl. 2 Sur #46-55, El Poblado, Medellín, Antioquia. It is a high-level facility with modern operating rooms, state-of-the-art laparoscopic equipment, and all the safety protocols and post-surgical care required for bariatric surgery.
05 · Recovery
After surgery
The average hospital stay is 24 to 48 hours for gastric sleeve and gastric bypass, and 48 to 72 hours for revision surgery. During the hospital stay, vital signs, hydration, pain management, progressive mobilization, and fluid tolerance are monitored.
Recovery has several phases: light daily activities in 7 to 14 days, return to the office in 1 to 2 weeks, moderate physical activity in 3 to 4 weeks, and intense physical exertion in 4 to 6 weeks. Nutritional recovery follows its own progression: clear liquids, full liquids, purees, soft foods, and solids over the course of 6 to 8 weeks.
For office work or jobs without physical exertion, most patients return 7 to 14 days after surgery. For jobs involving physical exertion, heavy lifting, operating machinery, or intense activity, we recommend waiting 4 to 6 weeks to avoid complications with the incisions and the abdominal wall.
The post-operative diet progresses in stages: Days 1–7: clear liquids (broths, gelatin, water, unsweetened tea). Weeks 2–3: full liquids and purees (protein powders, soft purees). Weeks 4–6: soft foods (shredded chicken, fish, cooked vegetables). Month 2 onward: a balanced solid diet with an emphasis on protein. Nutritional support is ongoing.
Gentle walks begin on the first post-operative day (even in the hospital; they are essential for preventing thrombosis). Low-intensity aerobic exercise (brisk walking, gentle swimming) in 2 to 3 weeks. Strength and high-intensity exercise after 6 to 8 weeks, once the abdominal wall has fully recovered.
Standard follow-up includes checkups at 24 hours, 8 days, 30 days, 90 days, 6 months, and 12 months, followed by annual checkups. Each checkup assesses weight loss, nutritional parameters, comorbidities, and adaptation to the new regimen. In the case of gastric bypass, annual checkups with comprehensive lab work are mandatory for life to detect nutritional deficiencies early.
Yes, for both procedures. After gastric sleeve: daily multivitamin, iron, and vitamin B12 as needed based on levels. After gastric bypass: supplementation is mandatory for life and includes iron, vitamin B12, vitamin D, calcium, and a daily multivitamin. Supplementation prevents anemia, osteoporosis, and other nutritional deficiencies.
06 · Results and Weight
What to Expect
The expected weight loss in the first 12 to 18 months is: 60% to 70% of excess weight with gastric sleeve and 70% to 80% of excess weight with gastric bypass. For example, a person who is 40 kg overweight can lose 24 to 28 kg with a sleeve, or 28 to 32 kg with a bypass. Results depend on the patient’s commitment to the post-surgical plan.
Results are seen progressively: 1 month ~10–15% of excess weight lost, 3 months ~25–40%, 6 months ~40–60%, 12 months ~60–80%. The fastest weight loss occurs in the first 3 to 6 months. After 18 months, weight tends to stabilize, and the focus shifts to maintenance.
Yes, especially gastric bypass. Complete remission of type 2 diabetes is observed in up to 80% of patients with gastric bypass and in 60–70% with gastric sleeve. Glycemic improvement begins days after surgery, before significant weight loss, thanks to intestinal hormonal changes. That is why bypass is also called “metabolic surgery.”
In addition to type 2 diabetes, bariatric surgery significantly improves: high blood pressure (controlled in 70–80%), sleep apnea (resolved in 75–80%), dyslipidemia (improvement in 70%), hepatic steatosis (fatty liver), polycystic ovary syndrome, chronic joint pain, and obesity-related depression.
It is possible, especially in patients who lose a significant amount of weight or have skin with poor elasticity. Excess skin (lipodermia) typically appears on the abdomen, arms, thighs, and breasts. Some patients opt for reconstructive plastic surgery (abdominoplasty, brachioplasty, etc.) 12 to 18 months after bariatric surgery, once their weight has stabilized.
Significant weight regain occurs in a small percentage of patients, mainly when there is non-adherence to the nutritional plan, lack of physical activity, or untreated behavioral issues. Options include: intensive nutritional support, psychological counseling, complementary medical treatment, or, in specific cases, bariatric revision surgery. Continuous medical follow-up prevents most of these cases.
Yes, but it is recommended to wait 12 to 18 months after gastric sleeve surgery and 18 to 24 months after gastric bypass surgery before trying to conceive. This allows weight to stabilize and nutrient levels to reach optimal levels. Post-bariatric pregnancy requires enhanced nutritional monitoring and specific supplementation to ensure the health of both mother and baby.
07 · Costs and Financing
Investing in Your Health
The cost of the surgical package varies depending on the procedure (sleeve, bypass, or revision), the type of hospitalization, and individual clinical findings. Medellín offers significantly lower costs than the United States, Canada, or Europe, with equivalent or superior surgical standards. A detailed budget is provided following the pre-surgical evaluation with Dr. Bula.
The initial evaluation consultation with Dr. Bula costs $170,000 COP. It includes a comprehensive clinical evaluation, review of medical history, BMI calculation, analysis of comorbidities, and a personalized recommendation for the most appropriate procedure for your case (sleeve gastrectomy, gastric bypass, revision surgery, or another option).
The package typically includes: fees for the lead surgeon and surgical team, anesthesiology fees, use of the operating room and laparoscopic equipment, hospitalization (24–48 hours depending on the procedure), antibiotic and antithrombotic prophylaxis, post-surgical endoscopy if indicated, follow-up consultations during the first year, and initial nutritional support. The exact details are provided in the personalized quote.
Dr. Bula currently sees patients only in private practice. Coverage by EPS, prepaid insurance, or supplemental plans varies depending on the plan and each insurer’s criteria. If your plan covers bariatric surgery, we will guide you through the steps to follow with your insurer.
Yes, we offer financing options to make the surgery accessible. The specific terms and payment schedules are discussed after the initial evaluation, taking your individual situation into account. We also accept payment in person, bank transfer, and other methods.
08 · International Patients
If you are coming from outside Colombia
Yes. We treat patients from the United States, Canada, Mexico, Ecuador, Panama, and Europe. The process is designed to minimize travel: a preliminary virtual evaluation via video call, coordination of pre-surgical tests in your city, scheduling of surgery in Medellín, and subsequent virtual follow-up for 12 months.
The virtual consultation is conducted via video call and lasts between 30 and 45 minutes. It includes a review of your medical history, weight, BMI, medical background, medications, available prior test results, and a discussion of your goals. At the end of the consultation, you will receive a preliminary recommendation for the appropriate procedure and a list of tests to be performed in your city.
We recommend a 10- to 14-day stay in Medellín for international patients: 1 to 2 days for the pre-surgical in-person consultation, 24 to 48 hours of post-surgery hospitalization, and 7 to 10 days of supervised recovery before the return trip. For revision surgery, the stay may be extended to 14 to 21 days.
Medellín is one of the leading destinations for medical tourism in Latin America thanks to: high-quality hospital infrastructure, qualified surgeons with international training, significantly lower costs than in developed countries, easy air connectivity (direct flights from major cities in the U.S., Canada, and Europe), a mild climate year-round (1,495 m above sea level), and lodging options near the clinics.
For your trip to Medellín, you must bring: a valid passport, complete pre-surgical test results (originals or digital copies), a detailed medical history, a list of current medications, medical travel insurance (recommended), and, in the case of revision surgery, the detailed surgical report from your previous bariatric surgery.
Yes. We’ll guide you on accommodation options near Clínica Las Vegas (apartments, hotels), transportation from the airport and to your appointments, restaurants with options that align with your post-operative nutritional plan, and 24/7 emergency contacts during your stay. We coordinate all clinical logistics and support you in the overall planning of your trip.
09 · About the Doctor
Dr. Bula
Dr. Bladimiro Bula Márquez is a general surgeon with a subspecialization in bariatric and laparoscopic surgery. He has performed more than 2,000 successful surgeries. His main practice is located at Clínica Las Vegas, Office 415, El Poblado, Medellín. Professional License No. 79788744.
Dr. Bula completed his undergraduate degree in Medicine and his residency in General Surgery at the Metropolitan University of Barranquilla (residency completed in 2012). He received his certification in Bariatric Surgery from the prestigious IRCAD Institute in Rio de Janeiro, Brazil, one of the world’s leading centers for training in minimally invasive surgery. He also received training in Surgical Management of Complex Abdominal Wall Conditions from the Universidad del Rosario (2016).
Dr. Bula primarily operates at Clínica Las Vegas (Cl. 2 Sur #46-55, El Poblado, Medellín), where he has his office. He is also affiliated with Clínica El Rosario in Medellín. Both are high-level institutions with all the surgical and post-operative care protocols required for bariatric surgery.
Dr. Bula is an active member of the Colombian Association of Obesity and Bariatric Surgery (ACOCIB), where he has participated in its national conferences. He has also regularly participated in the National Congress of General Surgery of Colombia and in specialized workshops such as the one on Laparoscopic Inguinal Herniorrhaphy at the CES Clinic in Medellín.
Dr. Bula has performed more than 2,000 successful surgeries throughout his career. His experience includes bariatric surgery (gastric sleeve, gastric bypass, and revision), anti-reflux surgery, laparoscopic cholecystectomy, inguinal herniorrhaphy, and other general laparoscopic surgical procedures.
You can schedule your consultation via: WhatsApp at +57 300 677 9166, a direct call to the office at Clínica Las Vegas, a message on Instagram @drbladimirobula, or through this website. For international patients, we coordinate a preliminary virtual consultation via video call.
Ready for your consultation?
If, after reading this page, you have a clear understanding of the procedures and want to take the next step, schedule a consultation with Dr. Bula.