Bariatric & Weight-Loss Surgery
Sleeve Gastrectomy
Sleeve gastrectomy is a metabolic and bariatric operation in which a large part of the stomach is removed, leaving a narrow tube or ‘sleeve’. It reduces the amount that can be eaten at one time and changes appetite and metabolic signalling. The operation is permanent and works best as part of lifelong nutrition, activity, supplementation and clinical follow-up.
Educational planning information. Individual advice follows examination and review of investigations. Consultations are available in Rawalpindi for patients from Rawalpindi and Islamabad.
Clinical focusStomach, small intestine and metabolic health
01How sleeve gastrectomy changes the stomach02Stomach, small intestine and metabolic health03Bariatric & Weight-Loss Surgery
Procedure-specific visual guideWhy choose Dr. Naveed
Experienced surgical judgement for Sleeve Gastrectomy
Clear diagnosis, realistic treatment planning and careful follow-up from a consultant surgeon whose clinical practice is shaped by academic teaching and military medical service.
01 · Understanding the procedure
What Sleeve Gastrectomy is designed to achieve
The small intestine is not bypassed, but digestion and eating still change substantially. Candidate selection considers BMI and obesity-related disease, previous treatment, reflux, medicines, eating behaviour, nutritional status and operative risk. People with significant reflux may need a different bariatric strategy after specialist assessment.
Sleeve gastrectomy is a metabolic and bariatric operation in which a large part of the stomach is removed, leaving a narrow tube or ‘sleeve’. It reduces the amount that can be eaten at one time and changes appetite and metabolic signalling. The operation is permanent and works best as part of lifelong nutrition, activity, supplementation and clinical follow-up.
02 · Conditions treated
Conditions and clinical situations addressed by Sleeve Gastrectomy
The exact indication is confirmed from symptoms, examination and appropriate investigations.
How sleeve gastrectomy changes the stomach
The small intestine is not bypassed, but digestion and eating still change substantially. Candidate selection considers BMI and obesity-related disease, previous treatment, reflux, medicines, eating behaviour, nutritional status and operative risk. People with significant reflux may need a different bariatric strategy after specialist assessment.
Evidence-informed bariatric criteria are met after full assessment
Evidence-informed bariatric criteria are met after full assessment
Non-surgical treatment has not achieved sufficient durable improvement
Non-surgical treatment has not achieved sufficient durable improvement
The expected benefits outweigh operative
The expected benefits outweigh operative, reflux and nutritional risks
03 · Symptoms
Symptoms that may lead to a Sleeve Gastrectomy consultation
Obesity-related breathlessness, reduced mobility, fatigue or joint strain
Type 2 diabetes, high blood pressure, sleep apnoea or fatty liver disease
Repeated weight regain despite structured treatment
Reflux symptoms are important because sleeve gastrectomy can cause or worsen reflux
No symptom pattern alone confirms suitability
Symptoms can overlap with other conditions. Severe, rapidly worsening or emergency symptoms require urgent medical assessment.
04 · Causes
Why the condition behind Sleeve Gastrectomy may develop
- 01
Severe or clinically significant obesity after insufficient durable response to non-surgical care
- 02
Metabolic risk that may improve with sustained weight management
- 03
Preference for an operation without small-intestinal bypass after balanced counselling
- 04
Readiness for permanent portion, hydration, protein, supplement and follow-up requirements
05 · Risk factors
Risk context considered before Sleeve Gastrectomy
Severe or clinically significant obesity after insufficient durable response…
Severe or clinically significant obesity after insufficient durable response to non-surgical care
Metabolic risk that may improve with sustained weight management
Metabolic risk that may improve with sustained weight management
Preference for an operation without small-intestinal bypass after balanced…
Preference for an operation without small-intestinal bypass after balanced counselling
Readiness for permanent portion
Readiness for permanent portion, hydration, protein, supplement and follow-up requirements
06 · Diagnosis
How the need for Sleeve Gastrectomy is assessed
The bariatric assessment reviews BMI and weight history, obesity-related conditions, reflux, previous abdominal surgery, medicines, nutrition and eating patterns. Blood tests assess metabolic and nutritional status. Anaesthetic, dietetic and psychological or behavioural review may be required. Endoscopy or imaging is selected when reflux, anatomy or another condition needs clarification.
Clinical history
The bariatric assessment reviews BMI and weight history, obesity-related conditions, reflux, previous abdominal surgery, medicines, nutrition and eating patterns.
Focused examination
Blood tests assess metabolic and nutritional status.
Laboratory testing
Anaesthetic, dietetic and psychological or behavioural review may be required.
Imaging
Endoscopy or imaging is selected when reflux, anatomy or another condition needs clarification.
Special investigations
Any endoscopy, tissue sampling, vascular study or other specialist test is selected for the clinical question raised by how sleeve gastrectomy changes the stomach; not every patient needs every test.
07 · Treatment options
Treatment choices before and alongside Sleeve Gastrectomy
Observation, lifestyle measures, medical care, a focused procedure or surgery may be considered according to the confirmed diagnosis.
Lifestyle & supportive care
Structured lifestyle and behavioural treatment
Non-surgical option 02
Evidence-based anti-obesity medicines
Non-surgical option 03
Sleeve gastrectomy
Targeted treatment
OAGB or another bypass procedure when the risk-benefit profile is more suitable
Surgical treatment
Continued medical weight management when surgery is not appropriate or not preferred
08 · Surgical indications
When Sleeve Gastrectomy may be recommended
Surgery is discussed only when the diagnosis, expected benefit, alternatives and individual risks support intervention.
- Evidence-informed bariatric criteria are met after full assessment
- Non-surgical treatment has not achieved sufficient durable improvement
- The expected benefits outweigh operative, reflux and nutritional risks
- The patient accepts irreversible stomach removal and lifelong follow-up
- Nutrition, psychological or medical concerns have been addressed before proceeding
09 · Procedure overview
The Sleeve Gastrectomy care pathway
Consultation
Discuss symptoms, priorities, previous care and relevant reports before deciding whether Sleeve Gastrectomy is appropriate.
Diagnosis
The bariatric assessment reviews BMI and weight history, obesity-related conditions, reflux, previous abdominal surgery, medicines, nutrition and eating patterns.
Preparation
The team reviews medicines, anaesthetic readiness and procedure-specific instructions for Sleeve Gastrectomy.
Procedure
Small laparoscopic incisions allow the stomach and surrounding anatomy to be assessed A sizing tube guides creation of a narrow stomach sleeve
Recovery
Patients usually walk early and remain in hospital for a short period while pain, hydration and signs of leak or bleeding are monitored.
Follow-up
Healing, symptoms and the result of Sleeve Gastrectomy are reviewed, with further care arranged when clinically necessary.
10 · Operative approach
How Sleeve Gastrectomy may be performed
- 01
Small laparoscopic incisions allow the stomach and surrounding anatomy to be assessed
- 02
A sizing tube guides creation of a narrow stomach sleeve
- 03
Most of the outer stomach is divided and removed using surgical staplers
- 04
The staple line is checked according to the surgical team’s protocol
- 05
The removed stomach is taken out through one incision
What Sleeve Gastrectomy aims to improve
- No intestinal bypass or bowel join is created
- Reduced stomach capacity and altered appetite signalling can support substantial weight loss
- Selected obesity-related health conditions may improve
- The operation is commonly completed laparoscopically
- Results vary and depend on long-term nutrition, activity and follow-up
Balanced consent for Sleeve Gastrectomy
- Bleeding, infection, blood clots and anaesthetic complications
- Staple-line leak, narrowing, twisting or need for another procedure
- New or worsened acid reflux and possible need for long-term treatment or revision
- Vomiting, dehydration, food intolerance or gallstones
- Iron, vitamin B12, folate, vitamin D or other deficiency despite no intestinal bypass
- Inadequate weight loss or later weight regain
No operation can guarantee an outcome. Personal risk depends on diagnosis, anatomy, health and the final technique.
13 · Recovery timeline
Recovery checkpoints after Sleeve Gastrectomy
Patients usually walk early and remain in hospital for a short period while pain, hydration and signs of leak or bleeding are monitored. Diet advances from clear or full liquids to puréed, soft and then suitable solid foods only as instructed. Energy and activity improve gradually over several weeks; the weight-loss journey varies, with the fastest change often occurring during the earlier postoperative months. These checkpoints are planning prompts—not promises—and the treating team’s instructions take priority.
Week 1
Patients usually walk early and remain in hospital for a short period while pain, hydration and signs of leak or bleeding are monitored. Early priorities include pain control, safe movement and the first wound or procedure check when advised.
Week 2
Sip fluids regularly and follow the staged bariatric diet exactly Activity still follows the individual discharge plan.
Week 4
Prioritise protein and stop eating at the first comfortable fullness Return to work or exercise depends on the procedure and job demands.
Week 6
Avoid smoking and follow instructions about reflux medicines and blood-clot prevention A slower or faster course can both be normal depending on the operation.
Long-term
No intestinal bypass or bowel join is created Ongoing surveillance or specialist follow-up is arranged when the diagnosis requires it.
14 · Preparation
Preparing safely for Sleeve Gastrectomy
01
Bring the complete record
Take reports, imaging, pathology and details of previous treatment relevant to how sleeve gastrectomy changes the stomach.
02
Review medicines and allergies
Share prescribed medicines, blood thinners, diabetes treatment, supplements and allergies. Do not stop treatment without clinical instruction.
03
Complete pre-operative checks
The bariatric assessment reviews BMI and weight history, obesity-related conditions, reflux, previous abdominal surgery, medicines, nutrition and eating patterns.
04
Follow fasting instructions
Fasting depends on the anaesthesia plan for Sleeve Gastrectomy; use the exact times supplied by the treating hospital.
05
Prepare for discharge
Arrange transport, suitable support and the supplies recommended for the expected usually a short inpatient stay, individualized to recovery and local protocol.
06
Know the recovery plan
Ask about wounds, bathing, diet, lifting, driving, work, exercise and the warning signs specific to Sleeve Gastrectomy.
15 · Aftercare
Aftercare following Sleeve Gastrectomy
Written discharge instructions are individualized. Keep them accessible and contact the treating team when recovery differs from the expected plan.
- Sip fluids regularly and follow the staged bariatric diet exactly
- Prioritise protein and stop eating at the first comfortable fullness
- Avoid smoking and follow instructions about reflux medicines and blood-clot prevention
- Take prescribed supplements and attend nutrition blood tests
- Increase walking and activity gradually; avoid heavy lifting until cleared
- Seek urgent care for severe abdominal or shoulder pain, fast heartbeat, fever, persistent vomiting, inability to drink, breathlessness, chest pain, leg swelling, bleeding or black stools
16 · Patient questions
Frequently asked questions about Sleeve Gastrectomy
Ten procedure-specific answers to support a more informed consultation.
01Is sleeve gastrectomy reversible?+
No. A large part of the stomach is removed permanently, although another bariatric operation may sometimes be considered later for complications or inadequate response.
02How does a sleeve help with weight loss?+
It limits meal volume and changes appetite and metabolic signalling. Long-term results still depend on eating patterns, activity, follow-up and individual biology.
03Can sleeve gastrectomy worsen reflux?+
Yes. New or worsened reflux is a recognized risk and may influence whether sleeve or another operation is recommended.
04What will I eat after sleeve surgery?+
The treating team provides a staged plan beginning with liquids and progressing through puréed, soft and then suitable solid foods. Timings vary by protocol and recovery.
05How quickly will weight change after a sleeve?+
The pattern varies. Change is often fastest in the earlier months and then slows; no specific amount or timeline can be guaranteed.
06How is the need for Sleeve Gastrectomy confirmed?+
The bariatric assessment reviews BMI and weight history, obesity-related conditions, reflux, previous abdominal surgery, medicines, nutrition and eating patterns. Blood tests assess metabolic and nutritional status. Anaesthetic, dietetic and psychological or behavioural review may be required. Endoscopy or imaging is selected when reflux, anatomy or another condition needs clarification.
07When might Sleeve Gastrectomy be recommended?+
Evidence-informed bariatric criteria are met after full assessment Non-surgical treatment has not achieved sufficient durable improvement
08Are there alternatives to Sleeve Gastrectomy?+
Structured lifestyle and behavioural treatment Evidence-based anti-obesity medicines Sleeve gastrectomy
09What anaesthesia may be used for Sleeve Gastrectomy?+
General anaesthesia. The anaesthetist confirms the safest option after reviewing the operation, medical history and individual risk.
10How long might I stay in hospital after Sleeve Gastrectomy?+
Usually a short inpatient stay, individualized to recovery and local protocol. Discharge depends on the procedure, pain control, mobility, eating or drinking where relevant, and the absence of concerning findings.
Authoritative patient-information referencesGeneral education supporting this procedure guide.
17 · Meet your surgeon
Dr. Naveed Ahmed Sheen
Consultant Colorectal & Laparoscopic SurgeonAssistant Professor and Major (Retired), combining 15+ years of surgical experience with academic teaching, military medical service and a patient-centred approach.
- MRCS · Dip (AFPGMI) · CHPE
- 1000+ successful surgeries
- 5000+ patients treated
Confidential surgical consultationDiscuss Sleeve Gastrectomy
Discuss Sleeve Gastrectomy
with Dr. Naveed
Bring your symptoms, reports and questions for a diagnosis-led discussion of appropriate options, benefits, risks and recovery planning.