Complications of Minimally Invasive Surgery

MIS Complications Overview - Tiny Cuts, Key Concerns

• MIS: Small incisions, specialized tools. Benefits: ↓ pain, faster recovery, ↓ scarring, shorter hospital stay.
• Risks: Mirrors open surgery risks plus unique MIS issues (e.g., related to access, insufflation).
• General Risks (MIS Nuances):
  • Infection: ↓ SSI rates typical; deep infections remain a concern.
  • Bleeding: Initial detection/control can be challenging.
  • DVT/PE: Early mobility helps; prolonged procedures ↑ risk.
• MIS-Specific Issues:
  • Access: Trocar injury (vessels, bowel), port-site hernia.
  • Insufflation (CO₂): Embolism (rare), cardiovascular/respiratory strain.
  • Energy Devices: Unintended thermal injury to adjacent structures.

⭐ Laparoscopic cholecystectomy generally demonstrates lower wound infection rates (~1%) versus open procedures (~5-8%).

Access & Pneumoperitoneum - Entry Errors, Gas Grief

• Access:
  • Veress needle: Blind; risk of injury.
  • Trocars: Bladed (↑injury), Bladeless (dilating), Optical (visual).
  • Max pressure: 12-15 mmHg.
• Entry Injuries:
  • Vascular: Aorta, IVC, iliacs.

    ⭐ Most common: Right common iliac artery.

  • Visceral: Bowel (most common), bladder.
  • Solid organ: Liver, spleen.
  • Palmer's Point: L mid-clavicular, 3cm below costal margin (alt. entry).
• Pneumoperitoneum ($CO_2$):
  • Effects: $CO_2 + H_2O \leftrightarrow H_2CO_3 \leftrightarrow H^+ + HCO_3^-$ (resp. acidosis).

    Parameter	Trend
    HR	↑ then ↓
    BP	↑
    ET$CO_2$	↑

  • Complications:
    • Subcutaneous emphysema.
    • Gas Embolism (⚠️): 📌 Signs (Hypotension, ET$CO_2$ ↓ sudden, Arrhythmia, Desaturation, Sound: mill-wheel murmur). Mgmt: Durant's (LLD, Trendelenburg).

Intraop & Energy Devices - Operative Oops, Zap Traps

• Intraop Injuries:
  • Types: Mechanical (trocars, instruments), Thermal (energy devices).
  • Common sites:
    • Bowel: Most common delayed diagnosis; thermal injury often missed.
    • Bladder: Trocar, dissection.
    • Ureteric: Near uterine artery/pelvic brim.
  • Recognition: Direct view, leak tests. Early detection crucial.
• Energy Device Complications: 📌 Mnemonic (Monopolar): BIC (Burns, Insulation failure, Capacitive coupling).
  • Comparison:

    Energy	Mechanism	Key Risks
    Monopolar	Current via patient to pad	Direct/capacitive coupling, insulation failure, alternate site burns
    Bipolar	Current between tips	Direct thermal spread
    Ultrasonic	Vibration	Lateral thermal spread, mechanical trauma

  ⭐ Capacitive coupling: risk unique to monopolar MIS, especially with hybrid trocars.

• Prevention: Check insulation, lowest power, avoid "buzzing" metal, prefer bipolar near vital structures.
• Bleeding: Limited access challenges control. Use clips, energy, sutures.

Post-Op & Long-Term - Aftermath Woes, Lasting Marks

• Port-Site Complications:
  • Infection, hematoma.
  • Hernia: Incisional, with Richter's type (bowel wall entrapment) being common.

    ⭐ Richter's hernia is more common at port sites than other incisional hernias.

• Port-Site Metastasis (PSM):
  • Tumor cell implantation. Risk factors: aggressive tumors, inadequate specimen retrieval. Prevention: wound protectors, careful extraction.
• Delayed Presentations:
  • Missed bowel injury: Presents as peritonitis days later.
  • Diaphragmatic hernia: Especially after upper abdominal/thoracoscopic procedures.
• Neuropathies:
  • Patient positioning can cause nerve injury (e.g., brachial plexus, common peroneal).
• Adhesions:
  • Less frequent than open surgery, but still occur; risk of bowel obstruction.

High‑Yield Points - ⚡ Biggest Takeaways

• Access injuries to vessels, bowel, or bladder are critical risks, especially at primary port insertion.
• CO2 gas embolism: sudden ↓ETCO2, hypotension, mill-wheel murmur; manage with left lateral decubitus, Trendelenburg.
• Hypercarbia & respiratory acidosis from CO2 absorption are common; monitor ETCO2.
• Port-site hernias for ports >10 mm; fascial closure is key to prevention.
• Thermal bowel injury from electrosurgery often presents late.
• Nerve injuries from prolonged/improper positioning; shoulder tip pain from diaphragmatic irritation.