Recommended Anesthetic Plan for Surgical Patients
The optimal anesthetic approach prioritizes multimodal opioid-sparing analgesia with regional techniques when feasible, combined with a standardized preoperative assessment focused on airway evaluation, cardiopulmonary status, and risk stratification based on surgical invasiveness and patient comorbidities.
Preoperative Assessment
Timing and Scope
The preoperative evaluation timing depends critically on surgical invasiveness and patient disease severity 1:
- High surgical invasiveness (major abdominal, pelvic, spinal): Complete assessment including medical record review, patient interview, and physical examination must occur prior to the day of surgery 1
- Low surgical invasiveness with healthy patients: May be performed on the day of surgery 1
- High-risk patients (ASA III-IV): Always require pre-surgical day assessment regardless of procedure 2
Essential Physical Examination Components
Every patient requires a focused assessment that must include 1, 3:
- Airway examination (100% mandatory for all cases)
- Pulmonary auscultation (88% consensus)
- Cardiovascular examination (81% consensus)
- Vital signs documentation
- Pain history and baseline pain levels 3
Critical pitfall: Avoid routine preoperative testing without clinical indication—clinical assessment trumps laboratory screening 4. Order tests only when patient history or physical findings justify them.
Premedication Strategy
What NOT to Give
Avoid long-acting benzodiazepines and sedatives, particularly in elderly patients (≥65 years), as they impair postoperative mobility, increase fall risk, and delay recovery 5, 6. The American Geriatrics Society provides strong evidence against benzodiazepines in older populations due to cognitive impairment and delirium risk 5.
Recommended Premedication Regimen
Multimodal opioid-sparing approach 7, 5:
Paracetamol (Acetaminophen): Pre- or intraoperatively, continued postoperatively 8, 5
NSAIDs or COX-2 inhibitors: Pre- or intraoperatively, continued postoperatively 8, 5
- Contraindication: Do NOT combine with therapeutic anticoagulation (increases bleeding risk 2.5-fold) 7
Gabapentinoids (if needed): Single lowest preoperative dose only 5
- Provides opioid-sparing effect
- Avoid multiple doses due to sedation, dizziness, visual disturbances
- Adjust for age and renal function
Anxiolysis (if required): Short-acting IV agents (fentanyl + small midazolam increments or propofol) titrated by anesthesiologist only when facilitating regional techniques 6
- Avoid oral anxiolytics that impair psychomotor function
Intraoperative Anesthetic Regimen
Regional vs. General Anesthesia
Prioritize regional anesthesia whenever possible 9, as it:
- Reduces viral aerosolization risk
- Decreases opioid requirements
- Facilitates faster recovery
- Improves postoperative pain control
For total hip arthroplasty specifically, use fascia iliaca block or local infiltration analgesia 8.
General Anesthesia Protocol
Induction and Maintenance
- Spinal or general anesthesia are both acceptable 8
- Short-acting agents preferred (desflurane or sevoflurane over isoflurane) 10
- Depth of anesthesia monitoring recommended, especially with TIVA + neuromuscular blockade 10
- Neuromuscular monitoring mandatory whenever paralytics used 10
Adjunctive Intraoperative Medications
1. Dexamethasone 8-10 mg IV (at induction) 7, 8, 7:
- Reduces postoperative pain
- Decreases PONV
- Dose: 8 mg adults, 0.15 mg/kg children
- Strong agreement recommendation
2. IV Lidocaine (for major abdominal/pelvic/spinal surgery without regional analgesia) 7:
- Bolus: 1-2 mg/kg
- Infusion: 1-2 mg/kg/h
- Provides analgesia, anti-hyperalgesia, anti-inflammatory effects
- Monitor for toxicity
3. Low-dose Ketamine (selective use) 7:
- Indications:
- Surgery with high risk of acute/chronic postoperative pain
- Patients on chronic opioids or with opioid addiction
- Dosing: Maximum 0.5 mg/kg after induction (prevents psychodysleptic effects), then 0.125-0.25 mg/kg/h continuous
- Stop 30 minutes before surgery end
- Do NOT continue postoperatively (increases hallucinations without significant analgesic benefit)
- Reduces 24-hour morphine consumption by ~15 mg and decreases chronic pain incidence by 30% at 3 months
4. Strong Opioids (rescue only) 7:
- Morphine remains reference standard
- Oxycodone equivalent: IV 1:1 ratio, oral 1:2 ratio (5 mg oxycodone = 10 mg morphine PO)
- Oral route preferred when possible
Special Population Considerations
Obese Patients 10
Assume all obese patients have sleep-disordered breathing and implement "SDB-safe" anesthesia:
- Avoid general anesthesia when possible
- Use short-acting agents exclusively
- Maintain head-up position throughout induction and recovery
- Drug dosing: Base on lean body weight, titrate to effect (NOT total body weight)
- Caution with long-acting opioids—consider level-2 care if required
- Ramped/sitting position for induction and extubation
- Ensure complete neuromuscular blockade reversal before extubation
- Extubate awake in sitting position
Postoperative Management
Pain Control
Opioids reserved as rescue analgesics only 8. Continue multimodal regimen:
- Paracetamol + NSAIDs/COX-2 inhibitors
- Regional analgesia techniques
- Early mobilization
Monitoring
- Standardized pain assessment tools required 3
- Document pain intensity, therapy effects, and side effects
- Continuous oxygen saturation monitoring until mobile (especially obese patients) 10
Thromboprophylaxis
- Mechanical prophylaxis (compression stockings) for all colorectal patients 6
- Pharmacological prophylaxis (LMWH) reduces symptomatic VTE from 1.8% to 1.1% 6
- Timing: Do not place/remove epidural catheters within 12 hours of heparin administration
Key Pitfalls to Avoid
- Never combine NSAIDs with therapeutic anticoagulation 7
- Avoid gabapentinoids as routine premedication—single lowest dose only if indicated 7
- Do not continue ketamine postoperatively 7
- Never dose obese patients by total body weight 10
- Avoid benzodiazepines in elderly patients 5
- Do not perform routine preoperative tests without clinical indication 4
This evidence-based approach balances efficacy with safety, prioritizing techniques that reduce morbidity, improve quality of life, and facilitate rapid recovery.