BARIATRIC AND UROLOGIC LAPAROSCOPY: SLEEVE GASTRECTOMY, MINI GASTRIC BYPASS, GASTRIC PLICATION, AND UROLOGIC RETROPERITONEOSCOPY INCLUDING PYELoplasty

BASIC INFORMATION

Date & Time: 13 February 2026, 10:50:50 IST

Lecture Handout Prepared from the Teaching Session by: Dr. R. K. Mishra

SUMMARY

This consolidated lecture presents a comprehensive, practice-oriented guide to key bariatric and urologic laparoscopic procedures. Bariatric sections cover laparoscopic sleeve gastrectomy (access, port placement, operative sequencing, anatomical landmarks, calibration and stapling strategy, ICG perfusion assessment, leak testing, extraction and port closure, and reinforcement methods), Mini/One-Anastomosis Gastric Bypass (principles, lesser-curvature retro-gastric window, creation of a long gastric tube, antecolic loop gastrojejunostomy, two-layer closure, and leak testing), and laparoscopic gastric plication (two-row full-thickness invagination technique, rationale, and context). The postoperative dietary framework emphasizes carbohydrate restriction and distinguishes behaviorally useful “dumping 1” from harmful bolus-related “dumping 2” due to tight anastomoses. Urologic sections detail laparoscopic pyeloplasty (contralateral port strategy, transmesenteric access, cold scissor spatulization, continuous crotch suturing, stenting, and drain placement) and retroperitoneoscopic access and surgery (nephrectomy sequence and ureterolithotomy), with emphasis on space creation, port stabilization, and peritoneal integrity. Across topics, the lecture prioritizes target-oriented ergonomics, disciplined measurements (“1-3-6” rule in sleeve), safety checks (methylene blue leak testing, ICG perfusion), and medicolegal documentation.

KEY KNOWLEDGE POINTS

• Sleeve gastrectomy: target-oriented port geometry shifted left; Veress entry at umbilicus; under-vision port placement; Nathanson retractor technique; “1-3-6” rule; calibration; stapler sequencing; ICG perfusion; leak testing; extraction and fascial closure.

• Staple-line reinforcement: bioabsorbable buttress reduces bleeding; routine oversewing does not reliably prevent leaks; timed tissue compression improves staple formation.

• Mini Gastric Bypass (OAGB/MGB): long low-pressure gastric tube; antecolic loop side-to-side gastrojejunostomy; two-layer closure; methylene blue leak test; optional anchoring and omentoplasty.

• Gastric plication: two full-thickness continuous rows (Ethibond) at 2 cm intervals; bougie-guided; posterior lumen kept open; no staplers or resection.

• Postoperative diet and dumping: restrict concentrated sugars; accept “dumping 1” as behavior-modifying; avoid tight anastomoses that lead to “dumping 2.”

• Patient selection: MGB for younger, high-BMI, high-expectation patients who will adhere to supplementation; sleeve for older or low-adherence profiles; avoid bariatric surgery if BMI < 30 or age < 18 or > 60.

• Laparoscopic pyeloplasty: contralateral diamond ports; transmesenteric access; cold scissor spatulization; continuous crotch suturing; stent and drain placement; do not close mesenteric window.

• Retroperitoneoscopy: posterior axillary line entry; balloon dilation with saline; higher tolerated pressures (19–20 mmHg); ureter-first nephrectomy sequence; peritoneal integrity; retroperitoneal ureterolithotomy strategy.

INTRODUCTION

Minimally invasive bariatric and urologic procedures demand precise anatomical orientation, target-oriented ergonomics, and standardized measurements to reduce complications and improve reproducibility. Sleeve gastrectomy offers restrictive weight loss with lower metabolic disruption than malabsorptive operations but requires meticulous port placement and calibrated stapling. MGB/OAGB builds upon established gastrojejunostomy principles, providing efficient metabolic outcomes through a long low-pressure gastric tube and a single anastomosis. Gastric plication offers a full-thickness, suture-based alternative where staplers are unavailable. In urology, laparoscopic pyeloplasty and retroperitoneoscopic surgery rely on disciplined access, space creation, and advanced intracorporeal suturing. Across domains, leak prevention (methylene blue testing, ICG perfusion), careful tissue handling, and clear patient selection criteria underpin durable clinical success and medicolegal safety.

LEARNING OBJECTIVES

• Identify and apply target-oriented port placement, ergonomic triangulation, and safe access strategies in obese and non-obese patients.

• Execute standardized operative steps for sleeve gastrectomy, MGB/OAGB, and gastric plication, including calibration, stapling/suturing, perfusion assessment, and leak testing.

• Perform laparoscopic pyeloplasty and retroperitoneoscopic procedures with correct access, spatulization, anastomotic suturing, and post-procedure drainage.

• Recognize complications, preventive measures, postoperative dietary principles, and patient selection criteria to optimize outcomes and mitigate risk.

CORE CONTENT

1. Laparoscopic Sleeve Gastrectomy: Access, Ergonomics, and Set-Up

1.1. Indications and Limitations

• Widely practiced; fewer metabolic complications compared with malabsorptive procedures.

• Not ideal for carbohydrate eaters and grazers; weight regain often begins at 6–12 months without lifestyle compliance.

1.2. Access and Pneumoperitoneum

• Veress needle entry at umbilicus; minimal skin nick (~1 mm).

• Confirm intraperitoneal placement (irrigation, suction, hanging drop tests).

• Select bariatric insufflator mode; camera trocar supraumbilical; white balance and focus prior to secondary ports.

1.3. Port Placement and Target-Oriented Geometry

• Primary target: angle of His (left-sided); operative diamond shifted left.

• Standard ports:

  • Camera: supraumbilical.

  • Right-hand working: right hypochondrium, midclavicular line, ~5 cm below costal margin.

  • Left-hand working: left hypochondrium, midclavicular line, just below costal margin.

  • Epigastric: slightly left of xiphoid for Nathanson retractor.

  • Assistant: left anterior axillary line at umbilical level.

  • Dedicated 12 mm stapler port: right midclavicular line at umbilical level.

• Insert all secondary trocars under direct vision; consider shortened wall–omentum distance in obesity.

1.4. Nathanson Liver Retractor Technique

• Introduce via epigastric site; perpendicular entry; clockwise rotation intra-abdominally.

• Seat convex portion beneath left lobe toward diaphragm; avoid forcing straight in.

1.5. Instrumentation and Staplers

• Endo-GIA linear stapler; common cartridge use: purple; alternatives: green for antrum, blue for body.

• Anticipate 5–7 cartridges of 60 mm.

2. Sleeve Gastrectomy: Anatomical Landmarks, Measurements, and Stapling Strategy

2.1. Diagnostic Survey and Landmarks

• Identify lesser and greater curvature, stomach body and antrum, incisura angularis, pylorus, pre-pyloric vein of Mayo (communication between right gastric and right gastroepiploic), left crus, gallbladder.

2.2. Measurement Strategy (“1-3-6” Rule)

• Preserve 6 cm of antrum from pylorus to maintain peristalsis.

• Maintain 3 cm from incisura angularis to prevent stricture.

• Keep 1 cm off angle of His; create a small dog-ear to avoid ischemia and GE junction encroachment.

• Marking: bipolar or Ligasure; avoid monopolar for marking.

2.3. Retrogastric Tunnel and Short Gastric Division

• Lift stomach atraumatically; create retrogastric tunnel (omentobursa).

• Divide all short gastrics from 6 cm off pylorus to left crus; stay close to gastric wall; gentle dissection near spleen to avoid capsular injury.

2.4. Calibration and Intraluminal Guidance

• Use 36 Fr bougie or endoscope for lumen standardization and visual guidance; reduce laparoscope light to see endoscope illumination.

2.5. Stapling Sequence and Technique

• First cartridge: green; subsequent: blue.

• Equal tissue inclusion in stapler jaw; orient final firing slightly toward spleen to avoid GE junction.

• Timed compression:

  • Optional pre-fire wait ~2 minutes before first firing.

  • ~20 seconds after each firing.

  • ~2 minutes before opening after final firing.

• Leak testing: methylene blue distension via endoscope (~50 mL).

2.6. ICG Fluorescence Perfusion Assessment

• Prior to last firing, keep stapler closed; inject ~1 mL ICG IV; observe perfusion (~2 minutes).

• Use available imaging modes (contrast, ENV, overlay; CSF on specific cameras) to confirm perfusion near angle of His.

2.7. Extraction and Port Closure

• Extract specimen through 12 mm stapler port with claw forceps; avoid tight, transverse endobag packing.

• Mandatory fascial closure of enlarged stapler port (~15 mm); 5 mm ports generally do not require closure in linea alba.

2.8. Staple-Line Reinforcement and Technology Variations

• Buttress (e.g., polyglactin-based SeamGuard) reduces bleeding and improves staple formation consistency.

• Routine oversewing: time-consuming; does not reliably prevent leaks; may tamponade minor oozing.

• Power staplers and single-fire long systems (e.g., Titan SGS): continuous curved staple line; higher cost limits adoption.

3. Alternative Bariatric Technique: Laparoscopic Gastric Plication (GP)

3.1. Principles and Rationale

• Full-thickness invagination without staplers or resection; lower cost; minimal staple-line bleeding risk.

3.2. Technique

• Use Ethibond sutures; bougie-guided; remove bougie after completion.

• Two continuous rows at standardized 2 cm intervals along anterior and posterior walls; second row placed 2 cm from first.

• Keep posterior lumen open; two-row strategy avoids creation of a rigid gas-filled tube and dead space.

3.3. Comparative Context

• GP contrasted with sleeve in cost and bleeding risk; endoscopic plication critiqued for superficial bites and high device cost.

4. Mini Gastric Bypass (OAGB/MGB): Principles and Operative Overview

4.1. Conceptual Framework

• Loop (Billroth II–like) antecolic side-to-side gastrojejunostomy; long gastric tube (not a small pouch) to minimize biliary reflux and maintain low pressure.

4.2. Port Set-Up and Access

• Five-port laparoscopy; both hypochondrial ports 12 mm; epigastric port for Nathanson retractor.

• Veress needle entry at umbilicus; confirm with hanging drop; insufflation and camera insertion.

4.3. Gastric Dissection and Tube Creation

• Lesser-curvature retro-gastric window at second gastric pedicle, ~12–15 cm from angle of His.

• Horizontal division across proximal stomach; bougie insertion; longitudinal division toward angle of His to create long tube.

4.4. Jejunal Limb Measurement and Orientation

• Identify jejunum at ligament of Treitz; measure ~2 meters distally by sequential counts; maintain limb orientation and avoid torsion.

4.5. Gastrojejunostomy and Closure

• Antecolic side-to-side stapled anastomosis; full-thickness gastrotomy and jejunal enterotomy.

• Two-layer closure: inner full-thickness continuous; outer seromuscular imbrication; optional anchoring sutures and omentoplasty.

4.6. Leak Testing and Postoperative Diet

• Methylene blue testing (~100 mL diluted via bougie) with limb occlusion.

• Optional gastrografin swallow on postoperative day 2; initiate liquids day 3; two weeks liquids, then semisolids and solids.

4.7. Outcomes and Physiology

• Low-pressure gastric tube reduces leak propensity compared with sleeve.

• Reported comorbidity resolution rates (as presented): diabetes ~85%, hyperlipidemia ~70%, hypertension ~80%, sleep apnea ~85%.

5. Postoperative Diet, Dumping, and Procedure Selection

5.1. Dietary Guidance after MGB

• Weight loss driven by surgery, not prolonged liquid phases; early small portions acceptable if rules followed.

• Emphasize protein; restrict concentrated sugars and refined carbohydrates; caution with culturally sensitive advice.

5.2. Dumping Patterns

• “Dumping 1”: osmotic/vasomotor symptoms after high sugar; behaviorally beneficial deterrent.

• “Dumping 2”: painful bolus obstruction at tight anastomosis (bread expansion; worsened by carbonation); harmful; avoid small anastomoses.

5.3. Procedure Selection

• MGB favored for younger patients with high BMI and strong expectations, with reliable supplementation adherence; approx. 80% excess weight loss at one year.

• Sleeve favored for older or low-adherence patients; approx. 40% excess weight loss; reduced malabsorptive risks.

• Avoid bariatric surgery if BMI < 30 or age < 18 or > 60.

5.4. Supplementation after MGB

• Daily vitamin D and calcium (~1000 mg/day), frequent B12, iron; monitor for malnutrition, osteoporosis, hair loss, gallstones.

6. Laparoscopic Pyeloplasty: Technique and Strategy

6.1. Indications and Contraindications

• Indications: symptomatic PUJ obstruction; asymptomatic with documented functional deterioration.

• Contraindications: intrarenal pelvis; multiple prior abdominal surgeries (parallel to open surgery).

6.2. Positioning and Port Strategy

• Full flank position; table bend ~140°; secure strapping.

• Contralateral diamond configuration with laparoscope between working instruments.

6.3. Access and Exposure

• Transmesenteric approach; avoid colonic mobilization; mesenteric window creation; greater hydronephrosis facilitates exposure.

6.4. Instruments and Sutures

• 10 mm 30° telescope; bipolar grasper; suction-irrigation; fenestrated retractor; 4-0 sutures; stents; drains.

6.5. Spatulization and Handles

• Cold scissor longitudinal split and oblique spatulization; preserve ~10% pelvic and ureteric attachments as traction handles; avoid energy at margins.

6.6. Anastomotic Technique (Clock-Face)

• Posterior stitch at 6 o’clock; continuous crotch suturing:

  • Left hemicircumference: ureter out-to-in; pelvis in-to-out.

  • Right hemicircumference: reverse sequence (ureter in-to-out; pelvis out-to-in).

• Drop upper J of stent into pelvis; trim pelvic handle; close pelvis with 2–3 sutures; place drain below pelvis; do not close mesenteric window.

6.7. Training Model and Robotics

• Chicken crop model (crop as pelvis; esophagus as ureter) for suturing practice.

• Robotic platforms enhance suturing precision and ease.

7. Retroperitoneoscopic Access and Procedures

7.1. Access and Space Creation

• First port: posterior axillary line between costal margin and iliac crest; perpendicular entry through thoracolumbar fascia; blunt spreading to “giving way.”

• Finger dissection anterior to psoas and posterior to Gerota’s fascia; balloon dilation with saline (glove-finger over sheath); confirm endoscopically.

7.2. Insufflation and Port Stabilization

• Pneumoretroperitoneum up to 19–20 mmHg tolerated; minimal impact on vena cava/diaphragm compared to intraperitoneal.

• Stabilization: elastic adhesive to prevent inward migration; securing suture around air inlet to prevent outward migration.

7.3. Retroperitoneoscopic Nephrectomy

• Orientation: psoas posterior; peritoneum anterior.

• Ureter-first strategy: identify, clip, and divide ureter; use residual ureter as handle to flip kidney and expose hilum.

• Hilar control: artery inferior, vein superior; window between vessels; clip protocol—three clips on each vessel (two on patient side, one on specimen), with 3 mm then 6 mm spacing; maintain peritoneal integrity.

• Specimen retrieval: endobag via optical port; visualization through alternate port.

7.4. Retroperitoneal Ureterolithotomy (Mid-Ureter)

• Indication: impacted middle-third stones not amenable to URS/PCNL.

• Proximal sling to prevent migration; longitudinal ureterotomy distal to sling; gentle stone delivery; double-J stent; suturing generally optional.

7.5. Distal Ureteric Reconstruction

• Prefer supine transperitoneal approach; reimplant on anterior bladder wall; anticipate low-grade hydronephrosis/reflux; psoas hitch if length insufficient.

SURGICAL PEARLS

• Plan port geometry according to target; shift sleeve “diamond” left for angle of His.

• Insert all secondary trocars under vision in obese patients; recognize shortened wall–omentum clearance.

• Nathanson retractor: perpendicular entry, clockwise rotation, under-vision seating beneath left lobe.

• Preserve exactly 6 cm of antrum; maintain 3 cm off incisura and 1 cm off angle of His; create dog-ear near His.

• Timed compression improves staple formation and hemostasis; avoid immediate stapler opening after firing.

• Buttress reinforcement reduces bleeding; oversewing alone does not reliably prevent leaks.

• In GP, use two full-thickness continuous rows 2 cm apart; keep posterior lumen open; avoid a rigid gas tube.

• MGB: construct long gastric tube; perform antecolic side-to-side gastrojejunostomy; two-layer closure; leak testing with methylene blue.

• Post-MGB diet: protein-forward; restrict sugars; do not intentionally create tight anastomoses to “avoid dumping.”

• Pyeloplasty: cold scissor spatulization; avoid energy at margins; continuous crotch suturing with clock-face orientation; do not close mesenteric window; place drain.

• Retroperitoneoscopy: create space with saline balloon; stabilize ports; peritoneal breach mandates conversion.

ANESTHETIC AND PHYSIOLOGICAL CONSIDERATIONS

• Bariatric insufflator mode recommended for pneumoperitoneum in obese patients.

• Retroperitoneal insufflation pressures up to 19–20 mmHg are acceptable due to minimal vena caval compression and limited diaphragmatic impact compared with intraperitoneal settings.

COMPLICATIONS AND THEIR MANAGEMENT

• Intraoperative:

  • Sleeve: liver injury from retractor misuse; omental/bowel injury during trocar insertion; bleeding from short gastrics or gastroepiploic if plane strays; thermal injury from monopolar marking.

  • MGB: staple-line bleeding; incomplete closure; limb torsion; anastomotic defects detected by methylene blue.

  • GP: not specifically detailed; emphasis on low bleeding risk.

  • Pyeloplasty: lower polar artery ligation; needle loss; hypercapnia; distal ureteral cutting error; colonic injury; port-site bleeding.

  • Retroperitoneoscopy: peritoneal breach; hematoma; stone migration during ureterolithotomy (prevent with proximal sling).

• Early postoperative:

  • Sleeve: staple-line leak (especially near angle of His); stricture at incisura; bleeding; splenic capsular tear sequelae.

  • MGB: anastomotic leak; dumping symptoms; wound issues; VTE risk.

  • Pyeloplasty: urine leakage; hematoma (favor intraperitoneal absorption by not sealing window).

  • Retroperitoneal ureterolithotomy: urinary leak; hematoma.

• Late postoperative:

  • Sleeve: port-site hernia at enlarged extraction site (prevent with fascial closure); weight regain in carbohydrate eaters/grazers.

  • MGB: nutritional deficiencies (iron, B12, calcium), GERD if geometry suboptimal; dumping 2 if tight anastomosis.

  • Pyeloplasty: recurrent PUJ stenosis (~3.5–4.8%); stone formation.

  • Ureteric reimplantation: anticipated low-grade hydronephrosis and reflux; counsel and follow.

MEDICOLEGAL AND PATIENT SELECTION CONSIDERATIONS

• Sleeve: document target-oriented port geometry, under-vision trocar insertion, Nathanson technique, measurements (“1-3-6”), calibration, reinforcement strategy, ICG perfusion assessment, leak testing, and fascial closure of extraction port.

• MGB: informed consent for loop configuration, expected outcomes, diet progression, supplementation requirements; document limb measurement, leak testing, and any anchoring/omentoplasty.

• GP: rationale for two-row full-thickness plication; calibration strategy; absence of staplers; cost context.

• Procedure selection: avoid bariatric surgery if BMI < 30 or age < 18 or > 60; psychiatric/multidisciplinary evaluation in high-volume programs; counsel realistic excess weight loss (sleeve ~40%; MGB ~80% at one year).

• Retroperitoneoscopy: consent for potential conversion to transperitoneal if peritoneum breached; document port stabilization in thin/pediatric patients.

SUMMARY AND TAKE-HOME MESSAGES

• Target-oriented access and port geometry, meticulous measurements, and disciplined instrument handling underpin safe sleeve gastrectomy.

• A long, low-pressure gastric tube with a single antecolic loop gastrojejunostomy defines safe, reproducible MGB; verify integrity with methylene blue and consider perfusion adjuncts.

• Gastric plication offers a cost-effective, full-thickness, suture-based alternative where staplers are unavailable; two-row technique prevents dead space.

• Postoperative outcomes depend on patient selection, dietary discipline, and supplementation adherence; avoid tight anastomoses that cause “dumping 2.”

• Urologic reconstructive success in pyeloplasty and retroperitoneoscopy rests on correct access, cold scissor spatulization, continuous suturing, space maintenance, and peritoneal integrity.

MULTIPLE CHOICE QUESTIONS (MCQs)

1. The primary target that determines sleeve gastrectomy port geometry is:

   • A. Pylorus

   • B. Angle of His

   • C. Duodenal bulb

   • D. Right hepatic lobe

   • Correct answer: B

2. The preferred initial site for Veress needle insertion in this lecture is:

   • A. Left upper quadrant

   • B. Supraumbilical

   • C. Umbilical

   • D. Right iliac fossa

   • Correct answer: C

3. The recommended skin incision size for Veress entry is approximately:

   • A. 10 mm

   • B. 5 mm

   • C. 1 mm

   • D. 2 cm

   • Correct answer: C

4. The “1-3-6” rule in sleeve gastrectomy refers to distances from:

   • A. Gallbladder, pylorus, duodenum

   • B. GE junction, fundus, antrum

   • C. Angle of His, incisura angularis, pylorus

   • D. Splenic hilum, pancreas, colon

   • Correct answer: C

5. The common first stapler cartridge used at the start of sleeve transection is:

   • A. White

   • B. Blue

   • C. Green

   • D. Purple

   • Correct answer: C

6. The staple-line reinforcement noted to reduce bleeding is:

   • A. Routine oversewing

   • B. Bioabsorbable buttress (e.g., polyglactin-based)

   • C. Metallic clips along the line

   • D. No reinforcement

   • Correct answer: B

7. A timed wait after each stapler firing demonstrated in the lecture is approximately:

   • A. Immediate release

   • B. 5 seconds

   • C. 20 seconds

   • D. 2 minutes

   • Correct answer: C

8. ICG perfusion is primarily assessed near the:

   • A. Pylorus

   • B. Incisura angularis

   • C. Angle of His

   • D. Antrum midpoint

   • Correct answer: C

9. In gastric plication, the spacing between consecutive bites is:

   • A. 0.5 cm

   • B. 1 cm

   • C. 2 cm

   • D. 3 cm

   • Correct answer: C

10. The posterior lumen in gastric plication is:

    • A. Completely closed

    • B. Partially stapled

    • C. Kept open

    • D. Converted into a tube

    • Correct answer: C

11. The primary gastric construct in MGB is:

    • A. Small high-pressure pouch

    • B. Long gastric tube

    • C. Sleeve with preserved pylorus

    • D. Gastrostomy reservoir

    • Correct answer: B

12. The gastrojejunostomy in MGB is:

    • A. Retrocolic, end-to-side

    • B. Antecolic, side-to-side

    • C. Retrocolic, side-to-side

    • D. Antecolic, end-to-end

    • Correct answer: B

13. The standard limb measurement for loop routing in MGB commonly targets:

    • A. 50 cm

    • B. 100 cm

    • C. 150 cm

    • D. 200 cm

    • Correct answer: D

14. Post-MGB, early diet progression emphasizes:

    • A. Prolonged liquid phase to drive weight loss

    • B. Early small portions with carbohydrate restriction

    • C. Immediate unrestricted solids

    • D. High-carbohydrate liquids

    • Correct answer: B

15. “Dumping 2” is primarily caused by:

    • A. High sugar intake only

    • B. A wide anastomosis

    • C. A tight anastomosis with bread bolus expansion

    • D. Lack of carbonation

    • Correct answer: C

16. Sleeve gastrectomy typical excess weight loss discussed is approximately:

    • A. 20%

    • B. 40%

    • C. 60%

    • D. 80%

    • Correct answer: B

17. MGB typical excess weight loss at one year discussed is approximately:

    • A. 20%

    • B. 40%

    • C. 60%

    • D. 80%

    • Correct answer: D

18. In pyeloplasty, energy use at anastomotic margins should be:

    • A. Liberal monopolar

    • B. Limited bipolar only

    • C. Avoided entirely

    • D. Ultrasonic exclusively

    • Correct answer: C

19. The initial posterior stitch in pyeloplasty anastomosis is placed at:

    • A. 12 o’clock

    • B. 3 o’clock

    • C. 6 o’clock

    • D. 9 o’clock

    • Correct answer: C

20. The optimal first port for retroperitoneoscopic access is:

    • A. Midline infraumbilical

    • B. Anterior axillary line

    • C. Posterior axillary line between costal margin and iliac crest

    • D. Paraspinal

    • Correct answer: C

MOTIVATIONAL MESSAGE FROM DR. R. K. MISHRA

“Every precise port, measured cut, and verified anastomosis is a promise kept to the patient—discipline is the bridge between intention and safe outcomes.”

Wishing you steadfast focus and integrity in your operative practice. May your learning today translate into safer, consistent results for every patient you serve.