Post-Fracture Emergency Comparison: Compartment Syndrome vs Fat Embolism — Timing, Signs, Interventions
Both emergencies follow fractures, but one kills tissue in hours and the other crashes the lungs in days. Picking the wrong timeline or hallmark sign on the NCLEX sends you toward an intervention that doesn't exist for that condition — fasciotomy won't fix an embolism, and oxygen alone won't save a limb.
Comparison
- ↑ pressure in fascial compartment → ischemia
- Tibial/forearm fx; tight cast or dressing
- Onset 6–12 hr (up to 48 hr)
- Fat globules embolize to lungs/brain
- Long-bone (femur), pelvic, multiple fx
- Onset 24–72 hr post-fracture
- ★Pain out of proportion; ↑ on passive stretch
- Unrelieved by opioids; late paresthesia/pulselessness
- ★Petechial rash: chest, axillae, conjunctivae
- Early dyspnea, hypoxemia; restlessness → ↓ LOC
- ★Compartment pressure ΔP < 30 or absolute > 30
- Clinical triad: hypoxemia + neuro + petechiae
- CXR bilateral infiltrates; ↓ PaO₂, ↓ platelets
- Bivalve/remove cast immediately; notify surgeon
- Keep limb at heart level (not above); no ice
- High-flow O₂ early; support ventilation
- IV fluids; immobilize the fracture
- ★Fasciotomy — only definitive treatment
- Supportive: O₂, ventilation PRN
- Corticosteroids controversial (per order)
- Report rising cast pain or numbness early
- Do not elevate limb above heart
- Early fracture fixation lowers risk
- Report sudden SOB or confusion
- Pulselessness/paralysis — late, irreversible
- PaO₂ < 60; ↓ LOC; respiratory failure/ARDS
- Rhabdomyolysis → AKI; Volkmann contracture
- ARDS; cerebral dysfunction; death
Compartment Syndrome
- ↑ pressure in fascial compartment → ischemia
- Tibial/forearm fx; tight cast or dressing
- Onset 6–12 hr (up to 48 hr)
Fat Embolism Syndrome
- Fat globules embolize to lungs/brain
- Long-bone (femur), pelvic, multiple fx
- Onset 24–72 hr post-fracture
Compartment Syndrome
- ★Pain out of proportion; ↑ on passive stretch
- Unrelieved by opioids; late paresthesia/pulselessness
Fat Embolism Syndrome
- ★Petechial rash: chest, axillae, conjunctivae
- Early dyspnea, hypoxemia; restlessness → ↓ LOC
Compartment Syndrome
- ★Compartment pressure ΔP < 30 or absolute > 30
Fat Embolism Syndrome
- Clinical triad: hypoxemia + neuro + petechiae
- CXR bilateral infiltrates; ↓ PaO₂, ↓ platelets
Compartment Syndrome
- Bivalve/remove cast immediately; notify surgeon
- Keep limb at heart level (not above); no ice
Fat Embolism Syndrome
- High-flow O₂ early; support ventilation
- IV fluids; immobilize the fracture
Compartment Syndrome
- ★Fasciotomy — only definitive treatment
Fat Embolism Syndrome
- Supportive: O₂, ventilation PRN
- Corticosteroids controversial (per order)
Compartment Syndrome
- Report rising cast pain or numbness early
- Do not elevate limb above heart
Fat Embolism Syndrome
- Early fracture fixation lowers risk
- Report sudden SOB or confusion
Compartment Syndrome
- Pulselessness/paralysis — late, irreversible
Fat Embolism Syndrome
- PaO₂ < 60; ↓ LOC; respiratory failure/ARDS
Compartment Syndrome
- Rhabdomyolysis → AKI; Volkmann contracture
Fat Embolism Syndrome
- ARDS; cerebral dysfunction; death
★ marks the fact that sets a column apart.
Clinical Pearl
Hours + pain with passive stretch = compartment. Days + petechiae + dyspnea = fat embolism.
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