Anaesthetic considerations for laparoscopic hysterectomy

1. Preoperative assessment

• Determine indication and anticipated difficulty: large uterus, endometriosis, adhesions, malignancy, prior pelvic surgery, potential conversion to laparotomy, and expected blood loss.
• Assess comorbidities particularly relevant to pneumoperitoneum and steep Trendelenburg:
  • Obesity, obstructive sleep apnea, restrictive or obstructive lung disease
  • Hypertension, ischemic heart disease, heart failure, pulmonary hypertension
  • Raised intracranial pressure, glaucoma, significant gastro-oesophageal reflux
• Check haemoglobin, group and screen/crossmatch according to bleeding risk, renal function if indicated, and pregnancy status when appropriate.
• Continue or modify medications according to local perioperative policy, including anticoagulants, antihypertensives, diabetes medication, and GLP-1 receptor agonists.
• Explain general anaesthesia, postoperative pain plan, high risk of postoperative nausea and vomiting (PONV), and possible need for transfusion or conversion to open surgery.

2. Anaesthetic technique and monitoring

• General anaesthesia with cuffed endotracheal intubation is standard, as pneumoperitoneum impairs ventilation and creates aspiration risk. The ASA notes that almost all laparoscopic hysterectomies are done under general anaesthesia (ASA patient information).
• Standard ASA monitoring: ECG, non-invasive BP, pulse oximetry, capnography, temperature, neuromuscular monitoring.
• Consider arterial pressure monitoring for severe cardiopulmonary disease, major obesity, anticipated major haemorrhage, prolonged complex surgery, or when non-invasive BP access becomes difficult after docking/positioning.
• Ensure reliable IV access before final positioning. Have blood available when haemorrhage risk is substantial.
• Secure the airway, IV lines and monitoring cables well before steep Trendelenburg and surgical draping, because airway access may become restricted.

3. Positioning: dorsal lithotomy with Trendelenburg

• Position while awake where possible to identify discomfort or restricted movement.
• Arms: tucked neutrally or abducted less than 90 degrees, with careful padding.
• Avoid excessive hip flexion, abduction, or external rotation. Raise and lower both legs simultaneously to reduce hip and lumbar strain.
• Pad pressure areas, including elbows, heels, sacrum, fibular heads, and calf supports.
• Use anti-slip devices and shoulder supports cautiously. Shoulder braces can cause brachial plexus injury, especially in steep Trendelenburg.
• Document position and protective measures. The ASA advisory recommends recording overall position, arm and leg position, padding, and specific positioning actions (ASA positioning advisory).
• Risks include peripheral nerve injury, compartment syndrome, facial and airway oedema, reduced functional residual capacity, atelectasis, and hypoxaemia.

4. Effects of CO₂ pneumoperitoneum and Trendelenburg

• Diaphragmatic elevation decreases lung compliance and functional residual capacity.
• Peak airway pressures rise; hypercapnia may develop due to CO₂ absorption.
• Steep Trendelenburg plus pneumoperitoneum may reduce lung compliance by about 50%, requiring ventilatory adjustment.
• Use lung-protective ventilation: appropriate tidal volume, adequate PEEP, recruitment manoeuvres when suitable, and increase minute ventilation to maintain acceptable ETCO₂ and arterial CO₂.
• In obesity or lung disease, anticipate difficult ventilation and consider pressure-controlled or pressure-regulated modes.

• Increased intra-abdominal pressure may increase systemic vascular resistance and alter venous return and cardiac output.
• Bradycardia or arrhythmia can occur during rapid peritoneal insufflation due to vagal stimulation. Ask the surgeon to stop insufflation, release pressure if severe, and treat clinically significant bradycardia.
• Avoid excessive insufflation pressure where possible and maintain appropriate intravascular volume.

• Trendelenburg and pneumoperitoneum increase intracranial and intraocular pressure.
• Use caution in patients with intracranial pathology, glaucoma, or significant eye disease.
• Prolonged steep Trendelenburg can cause facial, conjunctival, and airway oedema. Perform a cuff-leak assessment or use clinical judgement before extubation if oedema is suspected.

5. Intraoperative surgical concerns

• Establish clear communication before insufflation, Trendelenburg, uterine manipulation, and any need to change position.
• Be prepared for:
  • Haemorrhage from uterine, ovarian, iliac, or major abdominal vessels
  • Bladder, ureteric or bowel injury
  • CO₂ embolism, though rare: sudden hypotension, hypoxaemia, abrupt ETCO₂ reduction, and “mill-wheel” murmur
  • Subcutaneous emphysema, capnothorax/pneumothorax, hypercarbia
  • Conversion to laparotomy
• Maintain normothermia and monitor urine output in long cases or high-risk patients.
• Insert a urinary catheter if required by surgical protocol and for prolonged surgery.

6. Analgesia and PONV prevention

• Use multimodal, opioid-sparing analgesia:
  • Paracetamol
  • NSAID or COX-2 inhibitor if not contraindicated
  • Local anaesthetic infiltration at port sites
  • Consider transversus abdominis plane block, quadratus lumborum block, or intrathecal opioid only in selected settings
  • Titrate short-acting opioids as rescue analgesia
• These patients commonly have multiple PONV risks: female sex, laparoscopy, volatile anaesthetic exposure, and postoperative opioids.
• Use risk-based multimodal prophylaxis, such as dexamethasone at induction plus a 5-HT3 antagonist near completion, with an additional agent for high-risk patients.
• Consider total intravenous anaesthesia with propofol in patients at particularly high PONV risk.

7. Emergence and postoperative care

• Return patient gradually to horizontal position and deflate pneumoperitoneum before emergence.
• Extubate fully awake with confirmed neuromuscular reversal and adequate ventilation.
• Check for airway oedema after prolonged steep Trendelenburg.
• Monitor for pain, PONV, hypoventilation, shoulder-tip pain from diaphragmatic irritation, bleeding, oliguria, and signs of lower-limb nerve injury or compartment syndrome.
• Encourage early mobilisation, thromboprophylaxis according to VTE risk, and early oral intake where appropriate.

One-line exam summary