Anaesthesia Management for Healthy Adults Undergoing Elective Surgery
For a generally healthy adult undergoing routine elective surgery, prioritize maintaining oxygenation at all times, use opioid-sparing multimodal analgesia, avoid long-acting sedative premedication, and implement evidence-based Enhanced Recovery After Surgery (ERAS) protocols to minimize morbidity and accelerate recovery 1, 2.
Preoperative Assessment and Optimization
Fasting Guidelines
- Clear fluids permitted up to 2 hours before induction
- Solid foods and non-human milk up to 6 hours before induction 3
- Administer preoperative carbohydrate drinks (400ml of 12.5% maltodextrin solution 2-3 hours before surgery) to reduce insulin resistance, maintain lean body mass, and potentially shorten hospital stay by one day 2
Critical pitfall: Avoid prolonged fasting which increases patient discomfort, insulin resistance, and postoperative complications.
Premedication Strategy
Do not routinely administer long-acting or short-acting sedative premedication 2. This is a strong recommendation with high-quality evidence showing that sedatives:
- Impair postoperative mobility and oral intake
- Delay immediate recovery
- Reduce psychomotor function up to 4 hours postoperatively
If anxiolysis is absolutely necessary for regional anesthesia placement, use short-acting IV agents (small incremental doses of midazolam or propofol with fentanyl) titrated carefully under monitoring 2.
Thromboembolism Prophylaxis
Implement mechanical prophylaxis with well-fitted compression stockings for all patients 2. The risk without prophylaxis includes 30% asymptomatic DVT rate and 1% fatal PE. Add pharmacological prophylaxis with low-molecular-weight heparin (LMWH) once daily, which reduces symptomatic VTE from 1.8% to 1.1% 2.
Timing consideration: Do not place or remove epidural catheters within 12 hours of heparin administration 2.
Intraoperative Management
Airway Management Priority
The absolute priority is maintaining patient oxygenation at all times 1. This fundamental principle supersedes all other airway management considerations.
Preoperative assessment must evaluate:
- Risk factors for difficult mask ventilation
- Risk factors for difficult intubation (moving beyond binary yes/no to recognize intermediate "grey zone" risk) 1
- Have predefined algorithms ready with multiple backup devices: gum elastic bougie, videolaryngoscope, intubating laryngeal mask 1
Key principle: Accept failure of tracheal intubation after maximum two attempts and call for senior assistance before complications occur 1.
Anesthetic Technique Selection
Prioritize regional anesthesia whenever feasible 4. Regional techniques offer:
- Reduced drug requirements
- Lower risk of respiratory complications
- Faster recovery
- Better postoperative analgesia
For general anesthesia, use balanced technique with opioid-sparing approach:
- Avoid deep anesthesia (increases morbidity and delays recovery) 5
- Minimize neuromuscular blocking agents with appropriate reversal of residual paralysis 5
- Use shortest-acting drugs at lowest effective doses 5
Intraoperative Physiological Targets
Maintain adequate gut perfusion (critical for anastomotic integrity in abdominal surgery):
- Goal-directed fluid therapy using minimally invasive cardiac output monitoring 6
- Avoid intraoperative hypotension
- Use vasopressors (phenylephrine or low-dose norepinephrine) appropriately to maintain mean arterial pressure 6
Ventilation strategy:
- Low tidal volumes to limit peak airway pressure and reduce barotrauma risk 6
- Inspired oxygen concentration >80% decreases surgical site infection 6
- Lung recruitment maneuvers if patient in Trendelenburg position 6
Glycemic control: Keep blood glucose <10 mmol/L using IV insulin when needed to prevent postoperative complications 6.
Multimodal Analgesia
Use epidural analgesia for major abdominal/pelvic surgery (strong recommendation, moderate evidence) 6. Combine with:
- IV lidocaine infusion (weak recommendation, low evidence)
- Remifentanil during surgery (strong recommendation, low evidence) 6
This multimodal approach attenuates surgical stress response and reduces opioid requirements.
PONV Prevention
Implement multimodal anti-emetic prophylaxis as standard for all patients with ≥2 risk factors (female, non-smoker, history of motion sickness/PONV, postoperative opioid use) 6. PONV affects 30% of patients without prophylaxis and delays oral intake more than pain itself.
Multimodal regimen should include:
- Avoidance of emetogenic drugs (minimize opioids, avoid neostigmine if possible)
- Multiple anti-emetic classes
- Consider higher-dose perioperative glucocorticoids 6
Extubation Criteria and Management
Extubation criteria must be met with minimal aspiration risk 1:
- Awake patient
- Sitting position
- No residual neuromuscular blockade
- Empty stomach
- Hemodynamically stable
Post-extubation oxygenation maintenance:
- Seated position
- Oxygen therapy or high-flow nasal oxygen
- CPAP or non-invasive ventilation if indicated 1
Critical consideration: Airway control difficulties remain the major cause of anesthesia-related morbidity and mortality 1. Have airway exchange catheters available for high-risk extubations, though recognize 7-14% technical failure rate 1.
Special Populations
Elderly Patients
For patients >75 years, recognize that age alone should not ration surgical or critical care 7. However, assess:
- Reduced organ reserve limiting physiological stress response
- Multiple comorbidities and polypharmacy
- Cognitive dysfunction risk
- Frailty and geriatric syndromes
Assume mental capacity for decision-making; use proxy information only if capacity clearly lacking 7.
Diabetic Patients
Preoperative carbohydrate loading can be given with normal diabetic medication (weak recommendation due to limited evidence in diabetics) 2. Monitor glucose closely intraoperatively.
Evidence Strength Summary
The strongest recommendations (strong grade, high/moderate evidence):
- Fasting guidelines: clear fluids 2h, solids 6h 3
- Avoid routine sedative premedication 2
- Maintain oxygenation as absolute priority 1
- Multimodal PONV prophylaxis 6
- VTE prophylaxis with mechanical and pharmacological methods 2
Common pitfall: Attempting to follow all ERAS elements rigidly without individualizing based on surgical type and patient risk factors. The evidence supports these principles most strongly for colorectal and major abdominal surgery 6, 2.