👤 By the CinnaRN Clinical Content Team🕐 Updated 2026-08-23🏷️ Physiological Adaptation🔖 Free to read, print, and share
Also known as: pressure in muscle · tight cast pain · limb compartment pressure
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Use this quick-reference guide to spot, treat, and prevent Compartment Syndrome on the NCLEX. Keep it handy during review and on exam day!
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📒 The 1-minute cheat sheet
📌 Mech
↑pressure in compartment
blocks blood flow → tissue death
from cast, crush, swelling
🩺 Signs
PAIN out of proportion, ↑w/ stretch
unrelieved by opioids = KEY
paresthesia, pallor, pulselessness
✅ Do Now
notify provider IMMEDIATELY
loosen/bivalve cast, remove dressing
keep limb at HEART level (not elevate)
📌 Avoid
do NOT elevate above heart
do NOT apply ice/cold
fasciotomy if severe
📚 Compartment Syndrome — full study notes
The cheat sheet above is your quick recall card. These notes go deeper — what it is, what to do first, what must be reported, and what to teach.
Compartment syndrome is increased pressure within a closed muscle compartment that cuts off blood flow, leading to ischemia and tissue death. It is a surgical emergency most often seen after fractures, crush injuries, tight casts, or burns. Permanent muscle and nerve damage (and possible amputation) can occur within 4 to 6 hours, so early recognition is critical.
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Key points
Understand these first
The hallmark sign is severe, deep, throbbing pain out of proportion to the injury and unrelieved by opioids.
Pain on passive stretch of the muscles is one of the earliest and most reliable findings.
The 6 P's are pain, paresthesia, pallor, pulselessness, paralysis, and poikilothermia (coolness).
Pulselessness and paralysis are LATE signs; waiting for them risks permanent damage.
Compartment pressure above 30 mmHg or within 30 mmHg of diastolic pressure indicates the syndrome.
Muscle breakdown releases myoglobin, which can cause acute kidney injury (rhabdomyolysis).
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Nursing priorities
What to do, in order
Notify the provider immediately at the first sign of escalating, unrelievable pain.
Loosen or bivalve a constricting cast or remove restrictive dressings as ordered.
Keep the extremity at heart level, NOT elevated, to maintain arterial perfusion.
Stop applying ice, which causes vasoconstriction and worsens ischemia.
Prepare the patient for an emergency fasciotomy to relieve pressure.
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Red flags — report now
Escalate immediately
Pain unrelieved by opioids plus pain on passive stretch is compartment syndrome until proven otherwise.
Never elevate the limb above the heart or apply ice; both reduce blood flow and worsen ischemia.
Dark, tea-colored urine signals rhabdomyolysis and impending kidney failure; report at once.
Loss of pulse or movement means tissue death is imminent and surgery cannot wait.
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Labs & values
Numbers to know
Creatine kinase (CK): 30 to 170 U/L (markedly elevated with muscle breakdown)
Serum potassium: 3.5 to 5.0 mEq/L (rises with rhabdomyolysis)
Creatinine: 0.6 to 1.2 mg/dL (rises with myoglobin-induced kidney injury)
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Patient teaching
What patients must know
Report any increasing pain, numbness, tingling, or a sensation of tightness immediately.
Understand that a fasciotomy wound may be left open temporarily to relieve pressure.
❓ Compartment Syndrome: NCLEX FAQs
What are the priority nursing interventions for Compartment Syndrome?
Notify the provider immediately at the first sign of escalating, unrelievable pain. Loosen or bivalve a constricting cast or remove restrictive dressings as ordered. Keep the extremity at heart level, NOT elevated, to maintain arterial perfusion. Stop applying ice, which causes vasoconstriction and worsens ischemia.
What are the warning signs of Compartment Syndrome a nurse must report?
Pain unrelieved by opioids plus pain on passive stretch is compartment syndrome until proven otherwise. Never elevate the limb above the heart or apply ice; both reduce blood flow and worsen ischemia. Dark, tea-colored urine signals rhabdomyolysis and impending kidney failure; report at once. Loss of pulse or movement means tissue death is imminent and surgery cannot wait.
What do I need to know about Compartment Syndrome for the NCLEX?
The hallmark sign is severe, deep, throbbing pain out of proportion to the injury and unrelieved by opioids. Pain on passive stretch of the muscles is one of the earliest and most reliable findings. The 6 P's are pain, paresthesia, pallor, pulselessness, paralysis, and poikilothermia (coolness). Pulselessness and paralysis are LATE signs; waiting for them risks permanent damage.
What patient teaching is important for Compartment Syndrome?
Report any increasing pain, numbness, tingling, or a sensation of tightness immediately. Understand that a fasciotomy wound may be left open temporarily to relieve pressure.
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Quick Tip
The hallmark sign is severe, deep, throbbing pain out of proportion to the injury and unrelieved by opioids.