Phlegmasia Cerulea Dolens: A Venous Emergency

Phlegmasia cerulea dolens (PCD) is a life- and limb-threatening complication of massive iliofemoral DVT causing near-total venous occlusion. Immediate intervention prevents venous gangrene and amputation.

Pathophysiology

Extensive thrombus obstructs venous outflow → capillary pressure rises → fluid extravasation, arterial inflow compromise → ischemia, cyanosis, necrosis.

Clinical Presentation

• Sudden severe leg pain, swelling (often entire leg)
• Cyanosis (blue/purple discoloration), coolness
• Absent pedal pulses (late sign—arterial compromise)
• Sensory and motor deficits
• Compartment syndrome may coexist

Risk Factors

• Malignancy (strong association)
• Surgery or trauma (pelvic, orthopedic)
• Pregnancy or postpartum
• Estrogen therapy
• Thrombophilia, sepsis, dehydration, heart failure

Diagnosis

• Clinical: PCD is a clinical diagnosis—treat immediately.
• Duplex ultrasound: Confirms extensive thrombus, assesses flow.
• CT/MR venography: If ultrasound limited; defines extent.
• Compartment pressures if tense swelling.

Emergency Management

1. Anticoagulation: Therapeutic UFH, LMWH, or DOAC immediately.
2. Limb elevation: Above heart level.
3. Emergent thrombus removal:
   • Catheter-directed thrombolysis (CDT) + mechanical thrombectomy: Preferred if available within 24 hours.
   • Pharmacomechanical CDT (PCDT): Ultrasound-accelerated (EKOS) or pulse-spray + aspiration.
   • Surgical thrombectomy: If endovascular unavailable or failed.
4. Fasciotomy if compartment syndrome confirmed.
5. IVC filter only if anticoagulation contraindicated.
6. Vasopressors for hemodynamic support if needed.

Outcomes

• With timely CDT/PCDT: Limb salvage >90%, amputation <5%.
• Delayed treatment: Amputation 20–50%, mortality 10–20% (sepsis, PE).
• Long-term: High PTS risk; lifelong anticoagulation often needed.

PCD is a vascular emergency. "Time is tissue." Activate highest-level venous intervention team immediately.