BASIC INFORMATION

Date & Time: October 26, 2023, 11:30 AM (Indian Standard Time)

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

SUMMARY

This lecture provides a comprehensive guide to the principles and techniques of laparoscopic ventral and incisional hernia repair, intended for postgraduate surgeons and gynecologists. The session covers the spectrum of surgical procedures, including Intraperitoneal Onlay Mesh (IPOM) and IPOM-Plus, and the management of complex cases such as suprapubic "Swiss cheese" bladder hernias. A critical evaluation of surgical meshes and fixation devices is presented, contrasting biological, uncoated synthetic, and coated synthetic meshes. The discussion emphasizes an evidence-based approach to mesh selection, challenging the routine use of expensive composite meshes over standard polypropylene mesh by citing clinical data showing comparable outcomes. Detailed operative techniques are described, including strategic port placement (e.g., "Mishra's Point"), fascial defect closure with extracorporeal knots, and various mesh fixation methods like the double-crowning technique, transfascial sutures, and biological fibrin glue. The lecture also addresses the prevention and management of complications such as seroma, mesh infection, and iatrogenic tumor dissemination in cases of suspected malignancy.

KEY KNOWLEDGE POINTS

• Laparoscopic Hernia Repair Techniques: The lecture details IPOM for defects <4 cm and IPOM-Plus (with fascial defect closure) for defects >4 cm, as well as the Transabdominal Preperitoneal (TAP) approach for lumbar hernias.

• Surgical Mesh Classification and Selection: Meshes are categorized as biological, uncoated synthetic (polypropylene, polyester), and coated synthetic (composite and dual). The lecture presents evidence that standard polypropylene mesh offers clinical outcomes statistically equivalent to expensive composite meshes for intraperitoneal placement.

• Mesh Fixation Methods: Techniques include mechanical tackers (double-crowning technique), transfascial sutures (with a "perpendicular-then-oblique" pass), and biological fibrin glue, which can function as both an adhesive and an anti-adhesive barrier.

• Port Placement Strategy: The "Mishra's Point," a stretched Palmer's Point located 2 cm superior to the costal margin, is introduced as a safe primary entry site that avoids adhesions and negates the need for fascial closure.

• Management of Complex Hernias: Specific strategies are outlined for challenging cases, such as "Swiss cheese" bladder hernias, which involve bladder distension and prevesical mesh placement in the space of Retzius.

• Complication Management: Postoperative seroma should be managed conservatively with pressure garments and antibiotics, with aspiration reserved only for confirmed infection.

• Laparoscopy in Malignancy: A crucial distinction is made between confirmed malignancy (an indication for radical laparoscopy) and suspected malignancy (a relative contraindication where open surgery may be safer to prevent tumor spillage).

• Mesh Sizing Principle: A durable repair requires a mesh that is at least 12 cm larger than the defect diameter, ensuring a minimum of 6 cm of overlap in all directions.

INTRODUCTION

Ventral and incisional hernias are common surgical problems. While open repair has been the traditional approach, laparoscopic ventral hernia repair, first described by LeBlanc in 1993, is now considered the method of choice in many centers. The minimally invasive approach offers significant advantages, including reduced wound complications, faster patient recovery, shorter hospital stays, and lower recurrence rates. This lower recurrence is attributed to the application of Pascal's principle, where intraperitoneal mesh placement allows intra-abdominal pressure to secure the prosthesis. A critical component of this procedure is the selection and fixation of surgical mesh, a topic marked by considerable debate over cost versus clinical efficacy. This session aims to elucidate the principles, techniques, materials, and practical considerations of laparoscopic ventral hernia repair, equipping postgraduate surgeons with the foundational knowledge to incorporate this procedure safely and effectively into their practice.

LEARNING OBJECTIVES

• To differentiate the surgical management of confirmed versus suspected malignancy in laparoscopy.

• To understand the indications, contraindications, and advantages of laparoscopic ventral hernia repair, including the IPOM and IPOM-Plus techniques.

• To describe the procedural steps for laparoscopic hernia repair, including patient positioning, strategic port placement, fascial defect closure, and various mesh fixation methods.

• To classify surgical meshes and fixation devices and critically evaluate the evidence regarding their use.

• To learn the specific surgical technique for managing complex suprapubic "Swiss cheese" bladder hernias.

• To recognize and manage common intraoperative and postoperative complications associated with laparoscopic hernia repair.

CORE CONTENT

1. Laparoscopy in the Context of Malignancy

1.1. Suspected Malignancy vs. Confirmed Malignancy

A critical distinction must be made regarding the role of laparoscopy in oncological surgery.

• Suspected Malignancy: This refers to a scenario where malignancy is unexpectedly encountered during a procedure for a presumed benign condition (e.g., finding a gallbladder cancer during cholecystectomy or morcellating a uterine sarcoma). Performing a standard, non-radical procedure risks tumor spillage, port-site metastasis, and upstaging of the disease. This is a relative contraindication to standard laparoscopy, and conversion to open surgery is often the safest course to maintain oncological principles.

• Confirmed Malignancy: When a malignancy is preoperatively diagnosed and staged, radical laparoscopic resection is often the gold standard. Procedures such as radical colectomy are planned and performed with oncologic intent from the outset.

2. Principles of Laparoscopic Ventral Hernia Repair

2.1. Advantages of Laparoscopic Repair

• Reduced Recurrence Rate: The recurrence rate is <10%, compared to 20-40% for open techniques. This is attributed to the application of Pascal's Principle of Hydrostatic Pressure, where intra-abdominal pressure secures the intraperitoneally placed mesh.

• Reduced Morbidity: The procedure is associated with less postoperative pain, lower rates of wound infection, shorter hospital stays, and a faster return to normal activities.

2.2. Contraindications

• Loss of Domain: Inability to achieve a 6 cm mesh overlap on healthy fascia.

• Infection/Contamination: Active abdominal wall infection or enterocutaneous fistulas preclude prosthetic mesh use.

• Other Factors: Extremely large defects, abdominal skin grafts over the hernia, and incarcerated hernias with severe adhesions can be relative contraindications.

3. Surgical Techniques: IPOM and IPOM-Plus

3.1. Port Placement

• Primary Access and the "Mishra’s Point": Safe primary entry in a previously operated abdomen is crucial. Initial access is often gained at Palmer’s Point. A modified, safer entry point is Mishra’s Point, located 2 cm above the costal margin in the mid-clavicular line after stretching the skin inferiorly.

  • Advantages of Mishra’s Point: It provides an adhesion-free zone, and the port site does not require fascial closure as the tissue tract retracts beneath the rib cage, which acts as a natural barrier to herniation.

• Port Configuration: IPOM can be done with two ports. IPOM-Plus requires at least three ports for triangulation and two-handed suturing. A contralateral configuration is superior for suturing.

3.2. Operative Steps

• IPOM (Intraperitoneal Onlay Mesh): Recommended for defects <4 cm. The procedure involves adhesiolysis followed by placement and fixation of an intraperitoneal mesh over the defect.

• IPOM-Plus (IPOM with Defect Closure): Standard of care for defects >4 cm.

  1. Adhesiolysis: Freeing the bowel and omentum from the hernia sac and abdominal wall.

  2. Fascial Defect Closure: The fascial defect is closed using intracorporeal or extracorporeal sutures (e.g., Mishra's knot) to re-approximate the rectus muscles. The pneumoperitoneum pressure should be reduced before tightening each knot to minimize tension.

  3. Mesh Placement: An appropriately sized mesh (defect size + 12 cm) is placed with at least 5-6 cm of overlap.

  4. Mesh Fixation: The mesh is secured to the abdominal wall.

4. Surgical Meshes: Classification and Evidence-Based Selection

4.1. Biological Mesh

• Composition: Derived from biological sources (e.g., recombinant DNA-synthesized collagen).

• Indications: Its use is limited due to high recurrence rates. It is reserved for contaminated fields or in women of childbearing age who may require a future cesarean section, as it resorbs over 6-9 months.

4.2. Uncoated Synthetic Mesh

• Composition: Made from inert polymers like polypropylene or polyester.

• Application: Standard for Transabdominal Preperitoneal (TAPP) and Totally Extraperitoneal (TEP) repairs, where the peritoneum provides a natural anti-adhesive barrier.

4.3. Coated Synthetic Mesh

These are designed for IPOM placement and have an anti-adhesive barrier to prevent bowel adhesions.

• Composite Mesh: Every thread has a non-absorbable core and an absorbable outer coating (e.g., Vipro, Tímesh). Both sides are identical, so orientation is not critical.

• Dual Mesh: Has two distinct sides. One side (e.g., polyurethane-coated) faces the viscera, and the other (e.g., polyester) faces the abdominal wall for tissue in-growth. Correct orientation is critical.

4.4. Evidence on Mesh Selection

The lecture posits that the marketing of expensive composite meshes is not supported by robust clinical evidence.

• Clinical Evidence: Multiple studies have shown no statistically significant difference in major complication rates (adhesion-related bowel obstruction, fistula, infection, recurrence) between standard polypropylene mesh and newer composite meshes for IPOM repair.

• Conclusion: The available human clinical evidence supports the use of standard, cost-effective polypropylene mesh for laparoscopic ventral hernia repair.

5. Mesh Fixation: Devices and Techniques

5.1. Mechanical Fixation (Tackers and Staplers)

• Protack (Covidien): A 5 mm device that fires 30 helical titanium tacks.

• EMS-20 Stapler (Ethicon): An 11 mm device that fires 20 titanium staples.

• Endo-Anchor: A titanium device with two prongs that anchor the mesh.

• Double-Crowning Technique: A systematic fixation method involving an outer circle of tacks at the mesh periphery (every 2 cm) and an inner circle of tacks placed 1 cm medial to the first.

5.2. Transfascial Suture Fixation

This technique securely anchors the mesh corners.

1. Marking: After deflating the abdomen, the defect and mesh corner positions are marked on the skin.

2. Suture Passage: A needle (e.g., Veress) is passed perpendicularly through a pre-marked point, a suture end is grasped and pulled out. The needle is then re-inserted through the exact same skin puncture but directed obliquely to exit the fascia 2 cm away. The second suture end is pulled out.

3. Knot Tying: The knot, when tied, retracts into the subcutaneous space, preventing palpability. Absorbable suture (Vicryl) is preferred.

5.3. Biological Glue (Fibrin Glue)

• Principle: Fibrin glue (e.g., Tisseel) mimics the final step of the coagulation cascade.

• Dual Functionality: It acts as an adhesive if tissues are approximated within 40 seconds. It acts as an anti-adhesive barrier if allowed to laminate on a surface for more than 40 seconds without contact.

• Application: Used for sutureless IPOM repair, especially for direct inguinal and ventral hernias.

6. Management of Complex Hernias

6.1. Suprapubic "Swiss Cheese" Bladder Hernia

This complex hernia, often a sequela of cesarean section, involves multiple small defects near the bladder.

1. Bladder Distension: A Foley catheter is inserted, and the bladder is filled with ~500 mL of saline and clamped. This helps the bladder descend from the defects and defines its anatomy.

2. Dissection: The prevesical space of Retzius is entered. Dissection must be performed bluntly with a "platelet" or Kittner dissector to avoid bladder perforation.

3. Mesh Placement: A large polypropylene mesh is placed in the prevesical space and fixed securely to Cooper's ligament and the surrounding fascia.

6.2. Lumbar Hernia

These post-nephrectomy hernias are best managed with a Transabdominal Preperitoneal (TAP) approach, where a large mesh is placed in the preperitoneal space and covered by a peritoneal flap.

SURGICAL PEARLS

• For primary port entry in a previously operated abdomen, the "Mishra's Point" provides a safe access point that avoids adhesions and obviates the need for fascial closure.

• For IPOM-Plus repairs, a contralateral three-port setup is essential for effective suturing.

• The evidence shows that standard, inexpensive polypropylene mesh is as safe and effective as costly composite meshes for intraperitoneal placement.

• For transfascial suture fixation, always deflate the abdomen completely before marking the skin to ensure accurate placement.

• Always fix the most remote corner of the mesh first to avoid obscuring the operative field.

• Never place tackers or sutures directly over the hernia defect to avoid enterocutaneous fistula.

• When closing large defects with the Mishra's knot, leave a long tail and add an intracorporeal locking knot to prevent slippage.

• In suprapubic hernia repair, always distend the bladder. Dissection in the space of Retzius must be blunt.

COMPLICATIONS AND THEIR MANAGEMENT

• Intraoperative: Bowel injury during adhesiolysis and vascular injury (e.g., inferior epigastric vessels) during tacker placement are the most feared complications. Bladder perforation during retropubic dissection requires abandoning mesh placement.

• Early Postoperative: Seroma formation is the most common complication. It should be managed conservatively with pressure garments and prophylactic antibiotics. Aspiration is reserved for clear signs of infection (fever, rising leukocyte count) and must be performed under ultrasound guidance through healthy tissue.

• Late Postoperative:

  • Mesh Infection: If a seroma becomes infected and does not resolve with antibiotics, laparoscopic mesh removal may be necessary.

  • Enterocutaneous Fistula: A severe complication from mesh erosion into the bowel.

  • Nerve Injury: The Lateral Femoral Cutaneous Nerve (LFCN) is at risk during lateral tacking, potentially causing meralgia paresthetica.

  • Recurrence: May result from inadequate mesh overlap, improper fixation, or a missed defect.

MEDICOLEGAL AND PATIENT SELECTION CONSIDERATIONS

• Informed Consent: The choice of mesh, fixation method, and associated costs must be discussed with the patient, including the lack of definitive evidence for the superiority of high-cost meshes. For complex bladder hernias, implications for future pregnancies must be addressed.

• Suspected Malignancy: Proceeding with a standard laparoscopic procedure (e.g., uterine morcellation) in the face of a suspected but unconfirmed malignancy can be considered medical negligence if it leads to tumor dissemination.

• Staged Abdominoplasty: Performing abdominoplasty concurrently with hernia repair significantly increases the risk of mesh infection. Abdominoplasty should be delayed for at least 3 months to allow for mesh integration.

SUMMARY AND TAKE-HOME MESSAGES

• Laparoscopic ventral hernia repair is the preferred method for most ventral hernias, offering lower recurrence and morbidity.

• IPOM is suitable for defects <4 cm, while IPOM-Plus is necessary for defects >4 cm to restore the linea alba and minimize seroma.

• Strategic port placement, evidence-based mesh selection, and meticulous fixation are critical for success. Standard polypropylene mesh is a safe, effective, and cost-effective option.

• Complex hernias, such as suprapubic "Swiss cheese" defects, can be managed effectively with specific laparoscopic techniques, including bladder distension and retropubic dissection.

• Conservative management of postoperative seroma is paramount; aspiration should be avoided unless infection is confirmed.

MULTIPLE CHOICE QUESTIONS (MCQs)

1. According to the lecture, what is the primary advantage of laparoscopic ventral hernia repair based on Pascal's principle?

a) Faster operating time

b) Reduced need for general anesthesia

c) Lower recurrence rate due to internal pressure securing the mesh

d) Ability to use biological mesh

2. The "Mishra’s Point" for primary laparoscopic access is located:

a) 2 cm below the costal margin at Palmer's Point

b) At the umbilicus

c) 2 cm above the costal margin in the mid-clavicular line

d) In the contralateral iliac fossa

3. What is the recommended size threshold for a ventral hernia defect where IPOM-Plus (with fascial closure) should be performed instead of a simple IPOM?

a) 2 cm

b) 4 cm

c) 6 cm

d) 8 cm

4. According to the evidence presented, how does standard polypropylene mesh compare to newer, expensive composite meshes for IPOM repair?

a) Polypropylene mesh has a significantly higher rate of recurrence.

b) Newer meshes have a proven lower rate of bowel adhesion in human trials.

c) There is no statistically significant difference in major complication rates.

d) Polypropylene mesh should never be placed intraperitoneally.

5. In a dual-sided mesh for IPOM repair, which side must face the bowel?

a) The side designed for tissue in-growth

b) The polypropylene side

c) The anti-adhesive coated side

d) Either side can face the bowel

6. Which fixation device typically requires a 12 mm port for its application?

a) Protack (5 mm)

b) EMS-20 Stapler

c) Absorbable tacks (5 mm)

d) A Veress needle for transfascial sutures

7. When performing transfascial suture fixation, what is the purpose of using a single skin puncture with a "perpendicular-then-oblique" needle pass?

a) To ensure the knot retracts into the subcutaneous space

b) To make the suture stronger

c) To use less suture material

d) To avoid injuring the skin

8. What is the dual function of fibrin glue in hernia repair?

a) It acts as a hemostatic agent and a mesh coating.

b) It can be an adhesive or an anti-adhesive barrier, depending on timing.

c) It sterilizes the mesh and fixes it to the fascia.

d) It dissolves adhesions and prevents their reformation.

9. What is the recommended initial step when managing a suprapubic "Swiss cheese" bladder hernia laparoscopically?

a) Immediate dissection in the space of Retzius

b) Placing an intraperitoneal mesh over the bladder

c) Instilling 500 mL of saline into the bladder and clamping the catheter

d) Deflating the bladder completely

10. What is the minimum recommended mesh overlap for a durable laparoscopic ventral hernia repair?

a) 2 cm on all sides

b) 4 cm on all sides

c) 6 cm on all sides

d) 10 cm on all sides

11. What is the recommended management for a non-infected postoperative seroma?

a) Immediate ultrasound-guided aspiration

b) Surgical drainage and washout

c) Conservative management with pressure garments and prophylactic antibiotics

d) Placement of a new mesh

12. When closing a large fascial defect in an IPOM-Plus repair, what modification to the Mishra's knot is essential for security?

a) Using a thicker suture material

b) Tying the knot extracorporeally only

c) Leaving a long tail and adding an intracorporeal locking knot

d) Applying fibrin glue over the knot

13. A surgeon encounters a suspicious-looking gallbladder during a planned cholecystectomy with no preoperative workup for malignancy. What is the most prudent action?

a) Proceed with simple laparoscopic cholecystectomy and await histopathology.

b) Convert to an open procedure to prevent potential tumor spillage.

c) Biopsy the area and abort the procedure.

d) Complete the cholecystectomy and perform a radical lymphadenectomy.

14. Which statement correctly describes a composite mesh like Vipro?

a) It has two different sides that require specific orientation.

b) It is made entirely of animal collagen.

c) Every thread has a non-absorbable core and an absorbable coating, making both sides identical.

d) It is designed only for preperitoneal placement.

15. Performing uterine morcellation on a mass later found to be a sarcoma is an example of what clinical error?

a) A necessary risk of minimally invasive surgery

b) Iatrogenic tumor dissemination in a case of suspected malignancy

c) Appropriate management of a confirmed malignancy

d) An absolute contraindication for any surgery

16. Which of the following is a primary indication for using a biological mesh in hernia repair?

a) A standard TAPP inguinal hernia repair

b) Repair of a hernia in a severely infected abdominal wall

c) A small primary umbilical hernia

d) When the surgeon prefers a more expensive option

17. What is the "double-crowning" technique?

a) Using two overlapping meshes to cover a large defect.

b) A fixation method with an outer and inner ring of tacks.

c) A suturing technique for closing the hernia sac.

d) A method for managing a hernia with two defects.

18. Why is concurrent abdominoplasty with laparoscopic hernia repair strongly discouraged?

a) It is cosmetically inferior to a staged procedure.

b) It significantly increases the risk of mesh infection.

c) It prolongs the anesthesia time unnecessarily.

d) It requires a general surgeon and a plastic surgeon to operate together.

19. What is the recommended instrument for dissection in the space of Retzius during a suprapubic hernia repair?

a) Monopolar hook cautery

b) Harmonic scalpel

c) Blunt "platelet" or Kittner dissector

d) Metzenbaum scissors

20. A patient has a ventral hernia defect measuring 10 cm x 5 cm. According to the "12 plus defect" rule, what would be an appropriate mesh size?

a) 15 cm x 10 cm

b) 20 cm x 15 cm

c) 22 cm x 17 cm

d) 12 cm x 12 cm

Correct Answers: 1-c, 2-c, 3-b, 4-c, 5-c, 6-b, 7-a, 8-b, 9-c, 10-c, 11-c, 12-c, 13-b, 14-c, 15-b, 16-b, 17-b, 18-b, 19-c, 20-c.

MOTIVATIONAL MESSAGE FROM DR. R. K. MISHRA

The foundation of surgical mastery is not built on inherent talent, but on the relentless pursuit of knowledge and the disciplined refinement of every fundamental skill. Approach each procedure as a scholar and each patient as your ultimate teacher.

I wish you clarity, confidence, and continued success on your path to becoming exceptional surgeons.