Laproscopy

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Laparoscopy

Laparoscopy (also spelled laparoscopy) is a minimally invasive surgical and diagnostic technique that uses a rigid endoscope (laparoscope) inserted through small incisions in the abdominal wall to visualize and operate within the peritoneal cavity. It has largely replaced open surgery for a wide range of abdominal procedures.

1. Pneumoperitoneum - Creating the Working Space

The fundamental requirement of laparoscopy is lifting the abdominal wall away from the viscera to create a working space. Two approaches exist:

Carbon Dioxide (CO2) - Standard Choice

CO2 is the most widely used insufflation gas. It is rapidly absorbed across the peritoneal membrane, making it far safer than nitrogen in the event of vascular entry.

Nitrous Oxide (N2O)

N2O is physiologically inert, rapidly absorbed, and provides better analgesia when laparoscopy is done under local anesthesia. Controlled trials have confirmed its safety within the peritoneal cavity. However, its use in cancer surgery is cautioned due to unknown effects on port-site metastasis.

Inert Gases (Helium, Neon, Argon)

These cause no metabolic effects but are poorly soluble in blood, making gas embolism a serious risk if they gain venous access. They are rarely used clinically.

2. Physiologic Effects of CO2 Pneumoperitoneum

CO2 insufflation creates both local and systemic effects:

CO2 Pneumoperitoneum - Local and Systemic Effects

Respiratory Effects

CO2 is absorbed across the peritoneum and generates carbonic acid, causing respiratory acidosis
Body buffers (largely bone) absorb up to 120 L of CO2 before respiratory acidosis develops
Once buffers are saturated, the anesthesiologist must increase ventilatory rate or tidal volume
Severe respiratory acidosis can cause cardiac arrhythmias
Hypercarbia causes tachycardia, increased systemic vascular resistance, elevated BP, and increased myocardial O2 demand

Cardiovascular Effects

Increased intra-abdominal pressure compresses the inferior vena cava, reducing venous return from the lower extremities
In reverse Trendelenburg position, venous stasis and DVT risk increase
Increased intrathoracic pressure raises central venous pressure and cardiac filling pressures
If intra-abdominal pressure is kept under 20 mmHg, cardiac output is usually well maintained
DVT prophylaxis (sequential compression stockings, low molecular weight heparin) is recommended for longer procedures

Renal Effects

Pneumoperitoneum decreases renal blood flow, GFR, and urine output
This is partly from direct compression of kidneys and renal veins, and partly mediated by elevated renin and ADH
Intraoperative oliguria is common and does not reflect intravascular volume status - IV fluids should not be driven by urine output alone
Effects resolve within ~1 hour of desufflation

Gas Embolism

Rare but life-threatening complication when gas accesses the venous system
Suspect if hypotension develops during insufflation
Diagnose with an esophageal stethoscope: characteristic "mill wheel" murmur
Treatment: place patient in left lateral decubitus, head-down position to trap gas in the right ventricular apex, then aspirate via central venous catheter

3. Technique Overview

Access:

A Veress needle is inserted through a small infraumbilical incision to insufflate CO2 and create the pneumoperitoneum
Once adequate pneumoperitoneum is achieved, a primary trocar is introduced bluntly
The laparoscope is passed through the trocar
Additional working trocars are placed under direct vision for instruments

Alternative access:

Direct trocar insertion (Hasson technique): trocar placed without prior pneumoperitoneum via an open mini-incision - reduces risk of Veress needle injury

Patient positioning:

Trendelenburg (head-down): used for pelvic surgery (shifts bowel away from pelvis)
Reverse Trendelenburg (head-up): used for upper abdominal surgery (shifts bowel caudally)

4. Types of Laparoscopy

Type	Purpose
Screening	Excludes peritoneal penetration (e.g., in trauma) without full visceral evaluation
Diagnostic	Identifies pathology (e.g., staging cancer, evaluating abdominal pain, ectopic pregnancy)
Therapeutic	Treats the identified pathology (e.g., cholecystectomy, appendectomy, hernia repair)

5. Indications

General surgery:

Cholecystectomy (most common laparoscopic procedure)
Appendectomy
Hernia repair (inguinal, ventral)
Anti-reflux surgery (Nissen fundoplication)
Colectomy, splenectomy, adrenalectomy
Bariatric surgery

Gynaecology:

Sterilization
Lysis of adhesions
Endometriosis ablation (CO2 laser)
Myomectomy, salpingectomy, oophorectomy
Hysterectomy
Evaluation of pelvic pain or infertility

Urology:

Radical prostatectomy
Nephrectomy
Evaluation of nonpalpable testis (diagnostic)

Trauma:

Screening/diagnostic in stable patients with penetrating abdominal trauma
To detect diaphragmatic injury or peritoneal breach
Not for hemodynamically unstable patients

6. Contraindications

Absolute:

Hemodynamic instability (cannot tolerate pneumoperitoneum)
Severe uncorrectable coagulopathy
Inability to tolerate general anesthesia

Relative:

Severe cardiac or respiratory disease (limited tolerance for CO2 physiologic effects)
Prior multiple abdominal surgeries (extensive adhesions)
Pregnancy (risk of uterine injury, decreased uterine blood flow, fetal acidosis from CO2, preterm labor risk)
Increased intracranial pressure (pneumoperitoneum raises ICP - absolute contraindication in TBI)
Morbid obesity (technical difficulty, increased physiologic demands)
Large abdominal masses (>5 cm)

7. Complications

Related to Pneumoperitoneum

Cardiac arrhythmias
Subcutaneous emphysema
Pneumothorax / Pneumomediastinum
CO2 gas embolism
DVT and pulmonary embolism

Related to Needle/Trocar Insertion

Vascular injury (major vessels, trocar site bleeding)
Bowel injury (small bowel, colon)
Urinary tract injury (bladder, ureter)
Incisional hernia (especially at 10-12 mm port sites)

Related to Surgical Technique

Thermal/electrosurgical injury
Bile duct injury (in cholecystectomy)
Wound dehiscence
Port-site metastasis (in oncologic cases)

8. Advantages Over Open Surgery

Feature	Laparoscopy	Open
Incision size	5-12 mm ports	Large laparotomy
Postop pain	Significantly less	More
Recovery time	Days-weeks	Weeks-months
Blood loss	Less	More
Wound infections	Less	More
Hospital stay	Shorter	Longer
Cosmesis	Excellent	Visible scar
Insensible fluid loss	Minimal	Substantial

Disadvantages

Steep learning curve
Loss of tactile (haptic) feedback
2D visualization (standard laparoscopy; addressed by robotic 3D systems)
Instrument degrees of freedom are limited
Cannot perform in unstable patients or with extensive adhesions
Equipment cost

9. Special Considerations

Gasless Laparoscopy

In patients who cannot tolerate CO2 (severe cardiopulmonary disease), an abdominal wall lift device can be placed through a 10-12 mm trocar to mechanically elevate the abdominal wall without pneumoperitoneum. This eliminates all gas-related physiologic effects.

Robotic-Assisted Laparoscopy

Adds 3D high-definition visualization and wristed instruments with multiple degrees of freedom, improving ergonomics and facilitating complex dissection and suturing. However, it adds cost and eliminates haptic feedback entirely.

Pregnancy

Laparoscopy during pregnancy carries additional risks: uterine injury during trocar placement, decreased uterine blood flow, preterm labor risk from increased intra-abdominal pressure, and fetal acidosis from CO2 absorption. It can be performed in pregnancy when necessary (e.g., acute appendicitis, ovarian torsion) with appropriate precautions.

Sources: Schwartz's Principles of Surgery 11e, p.483; Tintinalli's Emergency Medicine; Bailey & Love's Short Practice of Surgery 28e; Sabiston Textbook of Surgery; Barash Clinical Anesthesia 9e

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