Neuraxial vs general anesthesia for hip fracture in a frail elderly patient on anticoagulation
An 86-year-old woman (weight 48 kg, frailty score 6) falls and sustains a displaced femoral neck fracture. She takes apixaban 5 mg twice daily for atrial fibrillation, last dose 14 hours ago. Creatinine clearance is 38 mL/min. She has mild cognitive impairment and a history of postoperative delirium after a previous operation. Surgery is planned for tomorrow morning.
1. How do you decide between spinal and general anesthesia, and what does the evidence actually support?
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The evidence (e.g., large randomized trials in hip fracture) shows no major difference in mortality or major morbidity between spinal and general anesthesia; the choice should be individualized.
Factors favoring spinal here:
- Avoids airway instrumentation and volatile agents, which may reduce delirium risk (evidence is mixed but plausible).
- Provides excellent analgesia and reduces opioid requirement.
- Allows monitoring of cognition postoperatively.
Factors favoring general:
- Anticoagulation timing may make neuraxial block unsafe or require delay.
- Spinal hypotension in a frail, possibly hypovolemic patient can be significant.
- Patient cooperation for a spinal may be limited by cognitive impairment.
A reasonable plan: spinal anesthesia with a low-dose bupivacaine (e.g., 7.5–10 mg hyperbaric) plus sedation, provided the anticoagulation interval is safe; otherwise general anesthesia with a supraglottic airway or endotracheal tube and multimodal analgesia.
2. Is the apixaban timing safe for a spinal? What would you do if surgery cannot be delayed?
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Apixaban 5 mg twice daily with CrCl 38 mL/min: the last dose was 14 hours ago. Guidance (ASRA/regional anesthesia society) recommends stopping apixaban for at least 72 hours before neuraxial anesthesia in patients with normal renal function, and longer with renal impairment. Fourteen hours is not safe for a spinal or epidural.
Options:
- Delay surgery until the apixaban has been held long enough (≥72 hours, longer given CrCl 38) - acceptable if the fracture is stabilized and the patient is comfortable; hip fracture delay beyond 48 hours increases morbidity, so balance this.
- General anesthesia with multimodal analgesia - no neuraxial contraindication.
- Peripheral nerve block (fascia iliaca or femoral) for analgesia - check whether the block site is at risk of hematoma; superficial blocks are generally lower risk but still consider anticoagulation.
If general anesthesia is chosen, document the reason and ensure thromboprophylaxis planning with the team.
3. How would you reduce this patient's risk of postoperative delirium?
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- Avoid benzodiazepines and anticholinergics; use dexmedetomidine or low-dose propofol for sedation if needed.
- Multimodal analgesia - regional block, paracetamol, judicious opioids; avoid pethidine.
- Early mobilization and physiotherapy on day 0–1.
- Orientation and sensory aids - glasses, hearing aids, familiar faces, daylight exposure.
- Treat pain, constipation, urinary retention, and hypoxia promptly.
- Avoid unnecessary catheters and restraints.
- Involve family and use a delirium screening tool (e.g., 4AT) twice daily.
- Optimize electrolytes and hydration; avoid over-transfusion.
- Review medications for deliriogenic drugs (e.g., anticholinergics, steroids, opioids).