Laparoscopic Access Techniques

Laparoscopic Access: Foundations - Prepping the Canvas

• Indications: Diagnostic (e.g., unexplained pain, staging laparoscopy) & Therapeutic (e.g., cholecystectomy, appendectomy, hernia repair).
• Contraindications:
  • Absolute: Hemodynamic instability, uncorrected coagulopathy, generalized peritonitis with septic shock, extensive bowel distension.
  • Relative: Multiple prior surgeries, severe cardiopulmonary disease, advanced pregnancy, morbid obesity.
• Patient Preparation: Informed consent, NPO 6-8 hrs, general anaesthesia (GA) with endotracheal intubation, bladder catheterization, nasogastric tube (selective), DVT prophylaxis.
• Anatomy (Layers for Port Entry): Skin → Subcutaneous tissue (Camper's, Scarpa's fascia) → Anterior rectus sheath / External oblique aponeurosis → Rectus abdominis muscle / Internal oblique muscle → Transversus abdominis muscle → Fascia transversalis → Preperitoneal fat → Peritoneum.

⭐ The umbilicus is the most common site for primary port placement due to its natural scar, thinnest abdominal wall, and central access.

Pneumoperitoneum Creation - The Insufflation Game

⭐ CO2 is standard: high diffusibility, rapid absorption, non-combustible, minimizing gas embolism risk vs air.

• Gas: Carbon Dioxide (CO2)
  • 📌 Properties (CARD): Cheap, Absorbed (rapidly, less acidosis), Rapidly diffused, Doesn't support combustion.
  • Flow rate: Initial low flow 1 L/min, then high flow >5 L/min once intraperitoneal.
• Insufflation Pressures:
  • Adults: Maintain 12-15 mmHg. Max 20 mmHg briefly for trocar.
  • Children/Pregnancy: Lower (8-12 mmHg), monitor closely.
• Veress Needle Technique: (Closed access technique)
  • Insertion Points:
    • Umbilicus: Commonest.
    • Palmer's Point: LUQ (3 cm below left costal margin, MCL), for prior surgery/obesity.
  • Angle: 45° towards pelvis (thin) to 90° (obese).
  • Placement Confirmation:
    • Double click sound (fascia, peritoneum).
    • Aspiration test (no blood/bile/gut contents).
    • Saline drop / Hanging drop test (confirms negative pressure).
    • Initial insufflation pressure $P_{initial} < \mathbf{8-10}\text{ mmHg}$.

• Troubleshooting Insufflation:

Laparoscopic Entry Techniques - Gateway Tactics

Primary abdominal access is critical. Choice depends on patient factors and surgeon preference.

⭐ Hasson (open) technique is generally considered the safest method in patients with previous abdominal surgeries or suspected adhesions to avoid bowel/vascular injury.

Port Strategy & Complications - Safe Passage

• Ergonomics: Aim for "baseball diamond" or "instrument triangulation". Optimal working distance: 15-20 cm; angle between instruments: 60-90°.
• Secondary Ports:
  • Site specific to procedure (e.g., cholecystectomy, appendectomy).
  • Avoid epigastric vessels (💡 transilluminate!), rectus muscle.
  • Direct visualization during insertion.
• Complications:
  • Key risks: Vascular (epigastric, major vessels), bowel (↑ risk with adhesions), solid organ injury.
  • Port-site issues: Bleeding, infection, hernia (close fascia for ports > 10mm, esp. midline).
  • Gas-related: Surgical emphysema, gas embolism (⚠️ rare, potentially fatal).
• Safe Practices:
  • Z-track insertion for bladeless trocars.
  • Confirm hemostasis at port sites on removal.

⭐ Injury to major retroperitoneal vessels (aorta, IVC, iliacs) is the most feared and potentially lethal access complication, though rare.

High‑Yield Points - ⚡ Biggest Takeaways

• Veress needle: commonest at umbilicus; Palmer's point (LUQ) for adhesions. Confirm entry with low initial pressure (<8 mmHg).
• Open (Hasson) technique: safest for previous abdominal surgery; direct cut-down.
• Optical trocars: allow visualized entry, reducing blind injury risk.
• Pneumoperitoneum: CO2 insufflation; maintain pressure at 12-15 mmHg.
• Key complications: major vascular injury (aorta, IVC), bowel perforation, gas embolism.
• Direct trocar insertion (DTI): rapid access, but requires experience; higher risk of injury an undilated abdomen_.