Robotic Surgery Anaesthesia

Quick Answer

Robotic-assisted surgery (RAS) presents unique anaesthetic challenges due to the combination of pneumoperitoneum, steep Trendelenburg position (25-45°), and reduced patient access once robot docked. Da Vinci system: Surgeon console remote from patient, robotic arms with instruments, pneumoperitoneum required for working space. Physiological effects: Pneumoperitoneum increases intra-abdominal pressure (12-15 mmHg), reducing venous return and cardiac output by 10-30%, while CO₂ absorption causes hypercapnia. Steep Trendelenburg further increases intrathoracic and central venous pressure, cranially displacing diaphragm and carina (risk of endobronchial intubation). Respiratory effects: Reduced FRC and pulmonary compliance (30-50% reduction), increased peak/plateau pressures (up to 50% increase), ventilation-perfusion mismatch. Cerebral effects: Elevated intraocular pressure (up to 13 mmHg increase), cerebral desaturation events in 4-56% depending on monitoring and management. Key management strategies: Secure ETT fixation (carina displacement risk), pressure-controlled ventilation with PEEP, limit pneumoperitoneum pressure and Trendelenburg angle when possible, cerebral oximetry monitoring in high-risk patients, staged positioning changes, and pre-planned emergency undocking protocol. [1-25]

The Da Vinci Surgical System

System Components and Function

Surgeon Console:

• Surgeon seated remotely from operating table
• Stereoscopic 3D vision through binocular viewer
• Master controls for robotic arms with motion scaling
• Foot pedals for camera control, energy activation, and clutching
• Complete immersion in surgical field with tactile feedback limitations

Patient-Side Cart:

• Four robotic arms (three for instruments, one for camera)
• Instruments with 7 degrees of freedom (EndoWrist technology)
• Motion scaling (3:1 to 5:1) for precision
• Tremor filtration for enhanced precision
• Various instrument options (graspers, scissors, needle drivers, energy devices)

Vision System:

• High-definition or 4K 3D camera
• 10-15x magnification capability
• Dual-lens endoscope for stereoscopic vision
• Integrated with surgeon console

Common Robotic Procedures:

• Urological: Radical prostatectomy (most common), partial nephrectomy, cystectomy
• Gynaecological: Hysterectomy, myomectomy, sacrocolpopexy, endometriosis resection
• General/Colorectal: Low anterior resection, colectomy, cholecystectomy
• Cardiac: Mitral valve repair, coronary artery bypass
• Head and Neck: Transoral robotic surgery (TORS)

Anaesthetic Implications of Robotic Setup

Patient Access Limitations:

• Once robot docked, extremely limited access to patient
• Robot arms may obstruct airway, IV lines, monitoring
• Position changes difficult or impossible after docking
• Emergency undocking requires specific protocol (takes 30-60 seconds)

Communication Challenges:

• Surgeon immersed in console, less aware of patient issues
• May not hear alarms or anaesthesia team communication
• Dedicated communication protocol essential
• Assistant surgeon at bedside crucial for communication bridge

Positioning Requirements:

• Steep Trendelenburg (25-45°) for pelvic/lower abdominal procedures
• Arms tucked at sides or on arm boards
• Pressure points must be protected before docking
• Position must be stable (risk of sliding with steep tilt)

Pneumoperitoneum Physiology

Cardiovascular Effects

Hemodynamic Changes:

• Increased intra-abdominal pressure (IAP): Typically 12-15 mmHg for robotic surgery
• Reduced venous return: Compression of IVC and pooling in lower extremities
• Decreased cardiac output: 10-30% reduction depending on IAP and patient position
• Increased systemic vascular resistance: 20-40% increase due to mechanical compression and neurohumoral activation
• Increased mean arterial pressure: Initially rises due to increased afterload
• Increased filling pressures: CVP, PCWP falsely elevated due to increased intrathoracic pressure

Pathophysiological Mechanisms:

1. Mechanical compression: Direct compression of abdominal vessels reduces venous capacitance
2. Neurohumoral activation: Sympathetic stimulation increases systemic vascular resistance
3. CO₂ absorption: Hypercapnia causes catecholamine release
4. Position effects: Trendelenburg partially offsets cardiovascular depression

Patient-Specific Factors:

• Healthy patients: Generally tolerate pneumoperitoneum well
• Cardiac disease: May decompensate with reduced preload and increased afterload
• Hypovolemia: Exacerbates hemodynamic effects
• Obesity: Combined with Trendelenburg, severe cardiovascular stress
• Chronic hypertension: Blunted baroreceptor response, less compensation

Respiratory Effects

Mechanical Changes:

• Diaphragmatic cephalad displacement: Reduces FRC by 30-50%
• Decreased pulmonary compliance: Chest wall and lung compliance both reduced
• Increased airway pressures: Peak and plateau pressures increase 20-50%
• Decreased tidal volume: For given inspiratory pressure, reduced delivery
• Ventilation-perfusion mismatch: Atelectasis in dependent lung zones

Gas Exchange Alterations:

• CO₂ absorption: 15-30 mL/min absorption through peritoneum
• Hypercapnia: PaCO₂ increases 3-10 mmHg depending on IAP and ventilation
• Increased PaCO₂-EtCO₂ gradient: Up to 5-10 mmHg difference
• Respiratory acidosis: Requires increased minute ventilation (20-30% increase)
• Hypoxemia: Possible if high FiO₂ not maintained

Ventilatory Strategy:

• Increased minute ventilation: 20-30% above baseline
• PEEP: 5-10 cmH₂O to prevent atelectasis (higher may be needed)
• Pressure-controlled ventilation: May be preferable to volume-controlled
• Recruitment manoeuvres: Consider to reopen atelectatic lung
• Monitor EtCO₂ and ABG: Gradient may widen significantly

Renal and Splanchnic Effects

Renal Effects:

• Reduced renal blood flow: Compression of renal veins and arteries
• Decreased glomerular filtration rate: May reduce urine output
• Activation of renin-angiotensin system: Fluid retention
• Oliguria: Common during prolonged pneumoperitoneum
• Risk of renal dysfunction: In prolonged cases or pre-existing disease

Splanchnic Perfusion:

• Reduced hepatic blood flow: Portal vein compression
• Intestinal ischemia risk: Compromised mesenteric perfusion
• Increased bacterial translocation risk: With prolonged procedures
• Hepatic enzyme elevation: Transient postoperative increase

Trendelenburg Position Physiology

Cardiovascular System

Central Redistribution:

• Increased venous return: Blood shifts from lower extremities to central circulation
• Increased preload: Enhanced ventricular filling initially
• Increased cardiac output: Usually maintained or slightly increased in healthy patients
• Increased CVP: Central venous pressure rises 5-15 mmHg
• Increased MAP: Mean arterial pressure often increases

Combined Pneumoperitoneum and Trendelenburg:

• Net cardiovascular effect: Pneumoperitoneum dominates, overall reduction in cardiac output
• Competing effects: Trendelenburg increases venous return; pneumoperitoneum decreases it
• Stroke volume: Usually reduced despite increased CVP
• Systemic vascular resistance: Significantly elevated
• Myocardial oxygen demand: Increased due to elevated wall tension

Concerns for Cardiac Patients:

• Volume overload with Trendelenburg may precipitate heart failure
• Increased afterload increases myocardial oxygen demand
• Limited cardiac reserve may result in decompensation
• Consider reducing Trendelenburg angle and pneumoperitoneum pressure

Respiratory System

Pulmonary Mechanics:

• Cranial diaphragm displacement: Further reduces FRC below pneumoperitoneum effect alone
• Decreased compliance: Chest wall compliance reduced by increased intra-abdominal and intrathoracic pressure
• Increased airway pressures: Combined effect of abdominal compression and reduced compliance
• Atelectasis formation: Rapid development in dependent zones

Ventilation Strategies in Trendelenburg:

• Higher PEEP required: 10-15 cmH₂O common to maintain FRC
• Pressure-limited ventilation: Avoid excessive plateau pressures (>30 cmH₂O)
• Permissive hypercapnia: Accept mild hypercapnia vs excessive airway pressures
• Recruitment manoeuvres: Essential after position changes
• FiO₂ optimization: Balance between oxygenation and atelectasis

Respiratory Monitoring:

• Peak inspiratory pressure: Monitor for excessive pressures
• Plateau pressure: Better measure of alveolar pressure
• Compliance calculations: Trend over time
• SpO₂ and EtCO₂: Continuous monitoring essential
• ABG: If prolonged surgery or unexpected hypercapnia

Cerebrovascular Effects

Cerebral Perfusion Changes:

• Increased intracranial pressure: Elevated CVP transmitted to cerebral venous system
• Reduced cerebral venous drainage: Impaired outflow raises intracranial volume
• Increased cerebral blood volume: Venous congestion
• Cerebral autoregulation: May be impaired, making perfusion pressure-dependent

Intraocular Pressure (IOP):

• Significant elevation: Increases 5-15 mmHg depending on angle
• Mechanism: Elevated episcleral venous pressure from increased CVP
• Peak elevation: Usually occurs at maximum Trendelenburg angle
• Risk factors: Prolonged duration, obesity, glaucoma, hypertension

Postoperative Vision Loss (POVL):

• Rare but devastating complication
• Associated with steep Trendelenburg, prolonged duration, hypotension
• Mechanism: Ischaemic optic neuropathy from reduced perfusion
• Prevention: Minimize angle when possible, maintain adequate perfusion pressure

Cerebral Oxygenation Monitoring:

• Near-infrared spectroscopy (NIRS): Monitors regional cerebral oxygen saturation (rScO₂)
• Baseline establishment: Record supine values before positioning
• Trend monitoring: Look for >20% drop from baseline or <55% absolute value
• Interventions if desaturation: Increase MAP, increase FiO₂, reduce Trendelenburg angle
• Evidence: Studies show cerebral desaturation events in 4-56% of robotic prostatectomy patients

Airway Management in Robotic Surgery

Endotracheal Tube Position Concerns

Carina Displacement:

• Cranial carina movement: Pneumoperitoneum and Trendelenburg displace diaphragm and carina cephalad
• Distance changes: 2-4 cm displacement common
• Endobronchial intubation risk: ETT tip may advance into mainstem bronchus
• Incidence: Reported up to 5-10% in steep Trendelenburg without repositioning

Prevention Strategies:

• Secure fixation: Tape ETT securely before positioning changes
• Position verification: Check ETT depth after final positioning
• Fibreoptic confirmation: Consider confirming position after steep Trendelenburg
• Auscultation: Check bilateral breath sounds after positioning
• Marking: Note ETT depth at teeth/lips before and after positioning

Monitoring:

• SpO₂: Unilateral lung ventilation causes desaturation
• Airway pressures: Increased resistance with endobronchial placement
• EtCO₂ waveform: May show changes with unilateral ventilation
• Chest excursion: Asymmetry suggests bronchial intubation
• Fiberoptic bronchoscopy: Gold standard for position verification

Extubation Considerations

Airway Oedema Risk:

• Facial and conjunctival oedema: Common with steep Trendelenburg
• Laryngeal oedema: Venous congestion may cause airway compromise
• Macroglossia: Tongue swelling from venous engorgement
• Delayed extubation: May be necessary if significant oedema

Extubation Strategy:

• Leak test: Check cuff leak before extubation (absence suggests oedema)
• Visual inspection: Direct laryngoscopy to assess airway oedema
• Sitting position: Extubate with head elevated if possible
• Awake extubation: Ensure fully awake with intact airway reflexes
• Reintubation readiness: Difficult airway cart immediately available
• CPAP availability: For OSA patients or respiratory distress

Postoperative Respiratory Monitoring:

• High-dependency care: For prolonged or high-risk cases
• Respiratory rate and SpO₂: Continuous monitoring
• Access to reintubation: Equipment and experienced personnel
• Postoperative chest X-ray: If respiratory concerns

Positioning and Pressure Injury Prevention

Shoulder Positioning and Brachial Plexus Protection

Shoulder Brace Use:

• Often required to prevent cephalad sliding in steep Trendelenburg
• Position at acromioclavicular joint, NOT neck
• Pad generously to prevent pressure injury
• Risk of brachial plexus injury if improperly placed

Brachial Plexus Injury Mechanisms:

• Direct compression: Shoulder braces compressing plexus
• Stretch injury: Arm positioning causing traction
• Ischemia: Prolonged compression impairs blood flow to nerves
• Incidence: 0.16% in gynaecologic laparoscopic/robotic surgery

Prevention:

• Position arms at sides or on padded arm boards
• Avoid excessive abduction (>90 degrees increases risk)
• Pad shoulder braces thoroughly
• Position braces laterally, not on neck
• Limit steep Trendelenburg angle when possible
• Document neurovascular checks postoperatively

Lower Extremity Complications

Compartment Syndrome:

• Risk factors: Prolonged lithotomy, Trendelenburg, hypotension
• Mechanism: Increased compartment pressure from positioning and reduced perfusion
• Symptoms: Pain, pallor, pulselessness, paraesthesia, paralysis
• Prevention: Limit lithotomy time, adequate padding, maintain perfusion
• Monitoring: Check extremities during prolonged cases

Deep Vein Thrombosis:

• Increased risk: Venous stasis from positioning and pneumoperitoneum
• Prevention: SCDs, chemoprophylaxis, early mobilization
• Consideration: Higher VTE prophylaxis doses in prolonged robotic cases

Neuropraxia:

• Common peroneal nerve: At fibular head with lithotomy
• Saphenous nerve: Medial leg/knee with lithotomy
• Sciatic nerve: Stretch with hip flexion
• Prevention: Padding, limit extreme positions, adequate stirrup support

Pressure Injury Prevention

Pressure Points in Robotic Surgery:

• Occiput (head support in Trendelenburg)
• Scapulae (chest/shoulder support)
• Sacrum/coccyx (if sliding)
• Heels (if legs elevated)
• Pressure from robotic arms

Prevention Strategies:

• Gel or foam padding at all pressure points
• Check skin integrity before and after surgery
• Reposition if prolonged procedure (when possible)
• Maintain normothermia (reduces pressure injury risk)
• Adequate hydration and perfusion

Emergency Management

Emergency Undocking Protocol

Preparation:

• All team members briefed on undocking procedure before surgery
• Clear communication protocol ("Code Red" or similar)
• Emergency undocking practiced in team drills

Steps for Emergency Undocking:

1. Surgeon disengages from console immediately
2. Remove all instruments from patient (unplug from arms first)
3. Undock patient cart from trocars
4. Move cart away from patient (30-60 seconds total)
5. Full patient access for resuscitation

Indications for Emergency Undocking:

• Cardiac arrest requiring CPR
• Severe hemorrhage
• Anaphylaxis
• Malignant hyperthermia
• Any life-threatening emergency requiring patient access

Considerations:

• Undocking does NOT require surgeon to scrub back in
• Assistant can remove instruments if surgeon unavailable
• Speed vs safety balance (avoid trocar avulsion)
• Patient safety always priority over robot

Cardiac Arrest in Trendelenburg

Challenges:

• Patient prone/supine equivalent difficult with robot docked
• Chest compressions may be ineffective in Trendelenburg
• Airway already secured (ETT in place)
• Access to defibrillation may be limited

Management:

1. Call for help and emergency undocking
2. Begin compressions while awaiting undocking if possible
3. Position patient supine immediately after undocking
4. Continue CPR per ACLS protocol
5. Consider internal cardiac massage if sternotomy available (rare)

Critical Events and Responses

Severe Hypercapnia:

• Increase minute ventilation (tidal volume and/or rate)
• Reduce pneumoperitoneum pressure if possible
• Consider ABG to assess PaCO₂-EtCO₂ gradient
• May need to temporarily desufflate abdomen

Cerebral Desaturation (if NIRS monitoring):

• Increase blood pressure (phenylephrine, noradrenaline)
• Increase FiO₂ to 100%
• Reduce Trendelenburg angle if possible
• Check ETT position (not endobronchial)
• Consider reducing pneumoperitoneum pressure

Significant Hemorrhage:

• Emergency undocking
• Massive transfusion protocol if needed
• Direct pressure or surgical control of bleeding
• Convert to open if necessary

Anaphylaxis:

• Stop suspected agent
• Emergency undocking
• Epinephrine, fluids, airway support
• Standard anaphylaxis management

Indigenous Health Considerations

Aboriginal and Torres Strait Islander Peoples:

Robotic surgery presents unique challenges for Indigenous Australian patients who often present with advanced disease due to delayed diagnosis and barriers to healthcare access. The requirement for specialized robotic infrastructure means Indigenous patients frequently must travel significant distances from remote and rural communities to tertiary urban centers, creating substantial cultural and social disruption. Extended separation from family, community, and Country during the perioperative period can cause significant psychological distress and impact healing.

Communication barriers may be pronounced when discussing complex robotic procedures. The concept of remote surgeon control via a console may be unfamiliar and concerning for patients who value direct interpersonal connection in healthcare. Aboriginal Health Workers and Liaison Officers play a vital role in explaining the surgical approach, addressing concerns about the surgeon's presence (or apparent absence), and ensuring informed consent is truly informed within a cultural context.

Sleep apnoea is highly prevalent among Aboriginal Australians, with rates significantly exceeding those in non-Indigenous populations. This comorbidity substantially increases the risks associated with steep Trendelenburg positioning and pneumoperitoneum. Preoperative optimization through CPAP therapy may be challenging in remote settings with limited access to sleep services. Outreach sleep programs and telemedicine consultations have demonstrated success in improving preoperative preparation for Indigenous patients undergoing robotic surgery.

Postoperative care presents ongoing challenges. The facial and airway oedema associated with prolonged Trendelenburg positioning may be more pronounced in patients with OSA, increasing extubation risks and the potential need for reintubation. In a patient population where trust in healthcare systems may already be compromised, difficult postoperative experiences can reinforce negative perceptions. Culturally safe care throughout the robotic surgery pathway, from preoperative optimization through to postoperative follow-up, is essential for both immediate outcomes and long-term healthcare engagement.

Māori Health Considerations:

Māori patients demonstrate similar patterns of advanced disease presentation and healthcare access barriers. The concentration of robotic surgery services in major urban centers (Auckland, Wellington, Christchurch) creates geographic barriers for Māori living in rural and provincial areas. Whānau often wish to accompany patients, creating logistical and accommodation challenges that can delay or deter surgical intervention.

The steep Trendelenburg position required for many robotic procedures carries heightened risks for Māori patients who experience elevated rates of obesity, cardiovascular disease, and diabetes. These comorbidities compound the physiological stresses of pneumoperitoneum and positioning, increasing the risk of cardiovascular decompensation, cerebral desaturation events, and difficult postoperative recovery.

Māori cultural approaches to health emphasize holistic wellbeing and the interconnectedness of physical, spiritual, and whānau dimensions. The highly technological nature of robotic surgery can feel disconnected from these values. Anaesthetists and surgeons should take time to explain how the technology serves the patient's holistic wellbeing and involve whānau in discussions about the procedure, risks, and recovery.

Postoperative follow-up after robotic surgery is crucial for detecting complications including anastomotic leaks, which may present later in the recovery period. For Māori patients returning to remote communities, ensuring robust follow-up pathways through local healthcare providers, telemedicine, and clear escalation protocols is essential. Partnership with Māori Health Workers and local primary care teams facilitates ongoing monitoring and early detection of complications.

ANZCA Exam Focus

Common Viva Topics

Physiology:

• Explain the cardiovascular effects of pneumoperitoneum and how they are modified by Trendelenburg position
• Describe the respiratory changes in steep Trendelenburg and their implications for ventilation
• Discuss cerebral autoregulation in the beach chair vs Trendelenburg position
• Explain the mechanism of endobronchial intubation risk in robotic surgery

Clinical Management:

• How would you manage a patient with severe COPD undergoing robotic prostatectomy?
• Describe your ventilatory strategy for a 4-hour robotic hysterectomy in steep Trendelenburg
• What monitoring would you use for a patient at high risk of cerebral desaturation?
• Outline your emergency undocking protocol

Complications:

• How do you prevent and detect endobronchial intubation in robotic surgery?
• What are the risk factors for postoperative visual loss in robotic surgery?
• Describe the prevention of brachial plexus injury in shoulder-braced Trendelenburg

Assessment Content

SAQ 1: Physiology and Ventilation (20 marks)

A 68-year-old male (BMI 32 kg/m²) is scheduled for robotic-assisted radical prostatectomy with expected duration 4 hours. He has a history of hypertension and mild COPD (FEV₁ 65% predicted).

a) Describe the cardiovascular effects of pneumoperitoneum at 15 mmHg pressure. (6 marks)

b) Explain how steep Trendelenburg position (35°) modifies these cardiovascular effects. (6 marks)

c) Outline your ventilatory strategy for this patient, including specific ventilator settings and rationale. (8 marks)

Model Answer:

a) Cardiovascular effects of pneumoperitoneum at 15 mmHg:

• Reduced venous return (2 marks): Compression of IVC and abdominal veins reduces preload
• Decreased cardiac output (2 marks): 10-30% reduction due to reduced stroke volume
• Increased systemic vascular resistance (1 mark): 20-40% increase from mechanical compression and sympathetic activation
• Increased mean arterial pressure (1 mark): Due to increased afterload initially

b) Modification by steep Trendelenburg (35°):

• Increased venous return from lower extremities (2 marks): Partially offsets pneumoperitoneum effect
• Increased CVP (1 mark): Central venous pressure rises 5-15 mmHg
• Complex cardiac output effect (2 marks): Trendelenburg increases venous return but pneumoperitoneum predominates; net reduction in stroke volume usually still occurs
• Increased preload may strain failing hearts (1 mark): Risk of heart failure in susceptible patients

c) Ventilatory strategy: Ventilator settings:

• Mode: Pressure-controlled ventilation (1 mark): Limits peak pressures while maintaining tidal volume
• PEEP: 10-12 cmH₂O (1 mark): Maintains FRC and prevents atelectasis in Trendelenburg
• Tidal volume: 6-7 mL/kg IBW (1 mark): Lung-protective ventilation
• Respiratory rate: 14-16/min (1 mark): Adjust to maintain normocapnia
• FiO₂: Minimum to maintain SpO₂ >94% (1 mark): Balance oxygenation vs atelectasis

Additional strategies:

• Recruitment manoeuvre after positioning (1 mark): 30-40 cmH₂O for 30 seconds
• Monitor plateau pressure (1 mark): Keep <30 cmH₂O
• ABG monitoring (1 mark): Assess PaCO₂-EtCO₂ gradient which widens in Trendelenburg
• Consider lower pneumoperitoneum pressure if tolerated (12 mmHg) (1 mark): Reduces respiratory effects

SAQ 2: Emergency Management (20 marks)

Thirty minutes into a robotic-assisted hysterectomy with the patient in steep Trendelenburg (40°) and pneumoperitoneum at 15 mmHg, the patient's blood pressure drops to 55/30 mmHg and heart rate increases to 130 bpm. SpO₂ remains 98% and EtCO₂ 42 mmHg.

a) What are the potential causes of this hypotension in this specific surgical context? (6 marks)

b) Describe your immediate management steps. (8 marks)

c) At what point would you initiate emergency undocking of the robot, and what is the procedure? (6 marks)

Model Answer:

a) Potential causes of hypotension:

• Severe reduction in venous return from combined pneumoperitoneum and positioning (2 marks): Most likely cause
• Vasodilation from excessive anaesthetic depth (1 mark): Inhalational agents, propofol
• Hypovolemia (1 mark): Inadequate preloading or bleeding
• Anaphylaxis (1 mark): To drugs, latex, or other agents
• Cardiac event (1 mark): Arrhythmia, ischemia, tamponade (less likely but possible)

b) Immediate management:

1. Call for help and alert surgeon (1 mark): Communication essential
2. Reduce pneumoperitoneum pressure to 10-12 mmHg or temporarily desufflate (2 marks): Immediate reduction in IVC compression
3. Reduce Trendelenburg angle (1 mark): Improves venous return if possible with robot docked
4. Aggressive fluid bolus (1 mark): 500-1000 mL crystalloid rapidly
5. Vasopressor administration (2 marks): Phenylephrine boluses or noradrenaline infusion
6. Check for bleeding (1 mark): Surgical source of hypotension

c) Emergency undocking: Indication: If no response to above measures within 2-3 minutes or if cardiac arrest (1 mark)

Procedure:

1. Surgeon immediately disengages from console (1 mark)
2. Remove all instruments from trocars (unplug from arms first) (1 mark)
3. Undock patient cart from trocars (1 mark)
4. Move cart away (30-60 seconds total) (1 mark)
5. Position patient supine for full access (1 mark)

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