Rib Fractures: The Pulmonary Spiral

What the Examiner Is Testing

This case tests whether you know the ASRA guidelines on Plavix and neuraxial anesthesia, and whether you have a viable alternative when the "gold standard" epidural is contraindicated. The examiner wants to see that you understand the pulmonary spiral — splinting leads to atelectasis leads to pneumonia leads to intubation — and that you have a plan to break it.

The Board Trap

The trap is performing a thoracic epidural because "it's the gold standard for rib fractures." Plavix must be held for 5 to 7 days before neuraxial anesthesia per ASRA guidelines due to the risk of epidural hematoma. This patient came in from the ED — Plavix was not held. An epidural hematoma in a patient with COPD and heart failure, who cannot undergo an urgent epidural hematoma evacuation safely, is a potentially catastrophic complication.

Walk-Through: How This Case Plays Out

Examiner: He needs analgesia urgently. Can you do a thoracic epidural?

Me: No. He's on Plavix and it hasn't been held for the required 5 to 7 days per ASRA guidelines. The risk of epidural hematoma is unacceptable. I'd perform an Erector Spinae Plane block instead — bilateral ESP blocks at the level of the fractures. The ESP block is a fascial plane block that carries a dramatically lower risk of hematoma compared to neuraxial techniques, and it provides excellent chest wall coverage for rib fractures.

Examiner: How does an ESP block compare to an epidural for this patient?

Me: An epidural provides complete unilateral or bilateral chest wall and visceral analgesia, and it's the gold standard for multiple rib fractures in a non-anticoagulated patient. But the ESP block works by spreading local anesthetic in the deep fascial plane along the erector spinae muscle, bathing the dorsal rami and providing dermatomal coverage without entering the neuraxial space. The effect is somewhat less dense than a true epidural, but in a patient who can't have an epidural, it's dramatically better than IV opioids alone.

Examiner: After the ESP block, his SpO2 improves to 93% and his RR drops to 22. What's your next concern?

Me: Good early response, but he's still tachypneic and his EF is 35% — I need to watch for volume overload and acute decompensated heart failure. I'd get incentive spirometry started immediately — measuring his inspiratory capacity is my metric for whether the analgesia is working. I'd also avoid NSAIDs aggressively in a patient with reduced EF, as they cause fluid retention and can worsen heart failure. Acetaminophen is safe.

Examiner: His family asks why he can't just have IV morphine for the pain. How do you explain?

Me: I'd explain that IV morphine in an 80-year-old with COPD causes respiratory depression — it suppresses his drive to breathe deeply, which makes the splinting and atelectasis worse, not better. It also causes sedation that increases delirium risk. The regional block gives him better pain control than morphine without any respiratory side effects. If he needs a small amount of opioid for breakthrough pain, I'd use it, but it's not my primary strategy.

Key Phrases That Score Points

• "Plavix means no epidural — ASRA requires 5-7 days hold. ESP block is my alternative."
• "Fascial plane blocks carry dramatically lower hematoma risk than neuraxial in the anticoagulated patient."
• "Incentive spirometry is my success metric — I want to see his inspiratory capacity improve."
• "IV opioids in a COPD patient cause respiratory depression and worsen the pulmonary spiral."
• "NSAIDs are contraindicated in heart failure with EF 35% — they cause fluid retention."

Why This Case Appears on the Boards

Rib fractures in the anticoagulated elderly test both your regional anatomy knowledge and your ASRA guideline recall. The ability to pivot from the gold standard to an equally effective and safer alternative when the clinical situation changes is exactly what consultants do.