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Phlegmasia Cerulea Dolens
Cardiovascular Presentations
Abdominal aortic aneurysm
Acute coronary syndrome (NSTEMI)
Acute coronary syndrome (STEMI)
Acute decompensated heart failure
Acute limb ischemia
Acute mesenteric ischemia
Aortic dissection
Aortic stenosis
Atrial fibrillation and flutter
Bradyarrhythmia and heart block
Cardiac arrest
Deep vein thrombosis
Myocarditis
Pericarditis
Pulmonary embolism
Stable angina
Superficial thrombophlebitis
Superior vena cava syndrome
Supraventricular tachycardia
Syncope (cardiogenic)
Unstable angina
Ventricular tachycardia
Respiratory Presentations
Acute bronchitis
Acute respiratory failure
Aspiration pneumonia
Asthma exacerbation
Bronchiolitis
Community-acquired pneumonia
COVID-19 pneumonia
COPD exacerbation
Croup
Croup (laryngotracheobronchitis)
Epiglottitis
Hemothorax
Hospital-acquired pneumonia
Pleural effusion
Pneumothorax (traumatic)
Pulmonary contusion
Spontaneous pneumothorax
Neurological Presentations
Bell's palsy
Benign paroxysmal positional vertigo
Brain abscess
Cauda equina syndrome
Cervical radiculopathy
Concussion (mild traumatic brain injury)
Encephalitis
Guillain-Barré syndrome
Hemorrhagic stroke (intracerebral)
Ischemic stroke
Lumbar radiculopathy
Malignant spinal cord compression
Migraine
Peripheral neuropathy (acute)
Retropharyngeal abscess
Schizophrenia (acute exacerbation)
Seizure (breakthrough:known epilepsy)
Seizure (first-time)
Spinal cord injury
Status epilepticus
Subarachnoid hemorrhage
Tension headache
Transient ischemic attack
Traumatic brain injury (moderate-severe)
Vestibular neuritis
Viral meningitis
Gastrointestinal Presentations
Acute appendicitis
Acute cholecystitis
Acute diverticulitis
Acute pancreatitis
Anal fissure
Choledocholithiasis and cholangitis
Clostridioides difficile colitis
Gastritis
Gastroenteritis (viral and bacterial)
Gastroesophageal reflux disease
Incarcerated or strangulated hernia
Inflammatory bowel disease flare
Large bowel obstruction
Lower GI hemorrhage
Peptic ulcer disease
Perforated viscus
Small bowel obstruction
Upper GI hemorrhage
Genitourinary and Reproductive Presentations
Acute prostatitis
Acute urinary retention
Ectopic pregnancy
Epididymitis
Orchitis
Ovarian torsion
Paraphimosis
Pelvic inflammatory disease
Priapism
Pyelonephritis
Renal laceration
Ruptured ovarian cyst
Testicular torsion
Tubo-ovarian abscess
Urinary tract infection (uncomplicated)
Urolithiasis (renal colic)
Vaginal bleeding (non-pregnant)
Infectious Disease Presentations
Acute sinusitis
Acute tonsillitis
Acute upper respiratory infection
Animal bite
Bacterial meningitis
Cellulitis
Conjunctivitis (bacterial)
Dental abscess
Endocarditis
Febrile neutropenia
Fournier gangrene
Hand-foot-mouth disease
Hepatitis (acute)
Herpes zoster
HIV-related illness
Human bite
Impetigo
Infected diabetic foot ulcer
Infectious mononucleosis
Influenza
Necrotizing fasciitis
Osteomyelitis
Otitis externa
Parasitic infection
Periorbital cellulitis
Peritonsillar abscess
Scabies
Sepsis
Septic arthritis
Spontaneous bacterial peritonitis
Tick-borne illness (Lyme disease)
Tinea infection
Tuberculosis
Viral exanthem
Wound infection
Trauma Presentations
Achilles tendon rupture
ACL and mceniscus tear
Ankle fracture
Ankle sprain
Burn
Calcaneus fracture
Cervical spine fracture
Clavicle fracture
Dental avulsion
Distal radius fracture
Drowning
Elbow fracture and dislocation
Electrical injury
Facial bone fracture
Facial laceration
Femur fracture
Fingertip amputation
Forearm fracture (radius and ulna)
Frostbite
Hand:finger laceration
Heat exhaustion
Heat stroke
Hip fracture
Humeral shaft fracture
Knee dislocation
Knee sprain
Lightning injury
Mandible fracture
Metacarpal fracture
Metatarsal fracture
Muscle strain
Nasal fracture
Non-accidental trauma
Orbital fracture
Patella fracture
Phalanx fracture (finger)
Proximal humerus fracture
Pulmonary contusion
Rib fracture
Rotator cuff tear (acute traumatic)
Scalp laceration
Scaphoid fracture
Shoulder dislocation
Skull fracture
Splenic laceration
Sternal fracture
Supracondylar pediatric fracture
Tendon laceration (hand:wrist)
Thoracic and lumbar spine fracture
Tibia:fibula fracture
Tibial plateau fracture
Toe fracture
Traumatic epistaxis
Traumatic hyphema
Toxicologic Presentations
Acetaminophen toxicity
Alcohol intoxication
Alcohol withdrawal
Anticholinergic toxicity
Anticoagulant overdose
Benzodiazepine overdose
Benzodiazepine:sedative overdose
Beta-blocker and calcium channel blocker toxicity
Carbon monoxide poisoning
Caustic ingestion
Digoxin toxicity
Drug eruption
Foreign body ingestion
Opioid intoxication
Opioid overdose
Opioid withdrawal
Organophosphate
Salicylate toxicity
Serotonin syndrome
Stimulant intoxication (cocaine, methamphetamine)
Tricyclic antidepressant overdose
Psychiatric Presentations
Acute anxiety
Acute psychosis
Agitation:behavioral emergency
Bipolar disorder
Conversion disorder
Major depressive episode
Neuroleptic malignant syndrome
Suicidal ideation and attempt
Musculoskeletal and Rheumatologic Presentations
Acute low back pain (mechanical)
Bursitis
Cervical radiculopathy
Costochondritis
Gout (acute)
Lumbar radiculopathy
Pseudogout
Tendinitis
Dermatology Presentations
Acute eczema (Eczema acute flare)
Allergic contact dermatitis
Erythema multiforme
Henoch-Schönlein purpura
Pressure injury
Psoriasis (acute flare)
Stevens-Johnson syndrome
Toxic epidermal necrolysis
Urticaria (acute)
Environmental and Exposure Presentations
Envenomation (snake, spider, insect)
High-altitude illness
Hypothermia
Hematologic and Oncologic Presentations
Acute chest syndrome
Coagulopathy
Hyperviscosity syndrome
Sickle cell crisis (vaso-occlusive)
Symptomatic anemia
Thrombocytopenia (severe)
Tumor lysis syndrome
Pediatric-Specific Presentations
Bronchiolitis
Croup
Emergency delivery
Febrile seizure
Kawasaki disease
Neonatal jaundice
Neonatal sepsis
Nursemaid's elbow
Pediatric fever 0 to 28 days
Pediatric fever 29 to 60 days
Pediatric fever 61 to 90 days
Pyloric stenosis
Slipped capital femoral epiphysis
Intussusception
Endocrine and Metabolic Presentations
Adrenal crisis
Diabetic ketoacidosis
Hypercalcemia
Hyperosmolar hyperglycemic state
Hypertensive emergency
Hypertensive urgency
Hypoglycemia
Myasthenia gravis crisis
Myxedema coma
Severe hyperkalemia
Severe hyponatremia
Thyroid storm
ENT and Maxillofacial Presentations
Acute laryngitis
Acute otitis media
Acute pharyngitis
Cerumen impaction
Epistaxis (anterior)
Nasal foreign body
Otitis externa
Tympanic membrane perforation
Ophthalmologic Presentations
Acute angle-closure glaucoma
Central retinal artery occlusion
Chemical eye injury
Corneal abrasion
Corneal ulcer
Globe rupture
Ocular foreign body
Orbital cellulitis
Retinal detachment
Obstetric Presentations
Hyperemesis gravidarum
Painful vaginal bleeding in pregnancy
Placenta previa
Placental abruption
Preeclampsia:eclampsia
Preterm labor
Threatened:inevitable:incomplete abortion
Systemic and Miscellaneous Presentations
Anaphylaxis
Angioedema
Cannabis-induced hyperemesis
Phlegmasia Cerulea Dolens
POCUS
Procedures
Calculators
Resuscitation
ECG Guide
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Clinical Assessment Checklist
Browse categories and answer follow-up questions to refine your symptom profile.
Approach to the Critical Patient
Immediate life threats
Limb-threatening venous ischemia recognition
▶
Classic triad: severe pain, massive edema, cyanosis
▶
Blue-purple discoloration with sharp inguinal demarcation
Tense non-pitting edema of the entire limb
Impending venous gangrene signs
▶
Bullae or skin necrosis
Dusky mottling progressing despite elevation
Concurrent PE in up to 30% of cases
▶
Tachypnea, chest pain, oxygen desaturation
Right heart strain pattern on ECG
Hemodynamic compromise from third-spacing
▶
Massive fluid sequestration into affected limb
▶
Up to several liters may shift acutely
Tachycardia and hypotension result
Hypovolemic shock management
▶
Large-bore IV access bilateral upper extremities
Aggressive crystalloid resuscitation immediately
Metabolic acidosis as primary cause of death
▶
Lactic acidosis from limb ischemia
Monitor lactate and pH serially
Immediate priorities
Activation and consultation triggers
▶
Vascular surgery consultation — mandatory and immediate
▶
Endovascular thrombectomy or surgical thrombectomy planning
Do not delay for imaging when diagnosis is clear
Interventional radiology consultation
▶
Catheter-directed thrombolysis candidacy assessment
Simultaneous with vascular surgery if available
ICU admission preparation
▶
Hemodynamic monitoring capability required
Serial neurovascular check every 1 to 2 hours
Immediate stabilization steps
▶
Limb elevation above cardiac level
▶
Reduces venous hypertension and swelling
Avoid compression wraps acutely
IV unfractionated heparin initiation
▶
Weight-based bolus 80 units/kg IV then 18 units/kg/hour infusion
Titrate to aPTT 60 to 100 seconds
NPO status in anticipation of procedural intervention
▶
Inform anesthesia if surgical thrombectomy anticipated
IV fluids to maintain euvolemia
Monitoring and escalation
Neurovascular monitoring targets
▶
Pedal pulse presence or absence every 1 to 2 hours
▶
Pulses present in approximately 50% of PCD cases at presentation
Loss of pulse indicates critical arterial compromise
Sensorimotor function of affected limb
▶
Paresthesias or motor weakness suggests compartment syndrome
Escalate immediately if deficits develop
Skin color and temperature trend
▶
Progression to dusky/mottled = impending gangrene
Demarcation level advancing proximally = escalation trigger
Escalation decision points
▶
No clinical improvement within 6 to 12 hours on anticoagulation alone
▶
Escalate to catheter-directed thrombolysis or thrombectomy
Grade 1A SVS/AVF recommendation for early thrombus removal
Compartment pressures at or above 30 mmHg after venous outflow restoration
▶
Fasciotomy consideration
Do not perform fasciotomy before thrombus removal
Hemodynamic deterioration despite resuscitation
▶
Vasopressor initiation if MAP below 65 mmHg persists
Reassess for concurrent PE or bleeding complication
History
Onset and symptom characterization
Temporal course
▶
Acute onset over hours to days
▶
Rapid progression from swelling to cyanosis
Preceded by phlegmasia alba dolens in 50 to 60% of cases
White to blue color change progression
▶
Phlegmasia alba dolens: white painful swollen leg (spared collaterals)
Phlegmasia cerulea dolens: blue-purple leg (collateral involvement)
Pain characteristics
▶
Severe unrelenting limb pain
▶
Often excruciating and refractory to standard opioids
IV lidocaine considered as rescue analgesia in refractory cases
Laterality
▶
Left lower extremity predominates
Due to May-Thurner anatomy (left common iliac vein compression)
Risk factors and triggers
Malignancy
▶
Most common underlying etiology
▶
Reproductive system cancers most frequent
Pelvic and abdominal malignancy causing extrinsic compression
Hypercoagulable state from cancer
▶
Trousseau syndrome association
Chemotherapy and erythropoiesis-stimulating agents
Venous structural abnormalities
▶
May-Thurner syndrome
▶
Left common iliac vein compression by right common iliac artery
Predisposes to left-sided iliofemoral DVT
Extrinsic compression
▶
Pelvic masses and uterine fibroids
Retroperitoneal pathology
Hypercoagulable states
▶
Antiphospholipid syndrome
▶
Lupus anticoagulant association
Prior thrombotic events
Heparin-induced thrombocytopenia (HIT)
▶
Prior heparin exposure within 100 days
Thrombocytopenia plus new thrombosis
Inherited thrombophilias
▶
Factor V Leiden mutation
Prothrombin gene mutation
Protein C or S deficiency
Antithrombin III deficiency
Immobilization and procedural triggers
▶
Recent surgery or trauma
▶
Internal hemipelvectomy association reported
Postoperative state
Prolonged immobilization
▶
Long-distance travel
Prolonged hospitalization
Central venous catheter placement
▶
Upper extremity PCD rare but reported
Iliac vein catheter tip position
Other contributing factors
▶
Pregnancy and postpartum state
▶
Hypercoagulability plus venous compression
Left-sided predominance further accentuated
COVID-19 associated coagulopathy
▶
Severe VTE including PCD reported
Inflammatory thrombosis mechanism
Prior DVT or PE episodes
IV drug use as injection site thrombosis trigger
Associated symptoms
Neurovascular symptoms
▶
Paresthesias and numbness
▶
Early sign of compartment syndrome
Dermatomal distribution assessment
Motor weakness or paralysis
▶
Compartment pressures can increase 16-fold within 6 hours
Suggests limb-threatening ischemia
Systemic symptoms
▶
Concurrent PE symptoms
▶
Dyspnea and pleuritic chest pain
Concurrent PE in up to 30% of cases
Constitutional symptoms suggesting malignancy
▶
Weight loss, night sweats, fatigue
Abdominal or pelvic pain
Physical Exam
Vital signs
Hemodynamic status
▶
Heart rate
▶
Tachycardia from hypovolemia and pain
May reflect concurrent PE
Blood pressure
▶
Hypotension from massive third-spacing into limb
MAP below 65 mmHg requires vasopressor consideration
Respiratory rate
▶
Tachypnea suggests concurrent PE or metabolic acidosis
SpO2 monitoring for hypoxemia
Temperature
▶
Fever may suggest infection or underlying malignancy
Limb examination
Inspection
▶
Skin color
▶
Blue-purple cyanosis of entire limb
Sharp demarcation at inguinal region
Skin integrity
▶
Bullae formation indicates venous gangrene progression
Areas of skin necrosis
Limb circumference
▶
Massive swelling compared to contralateral limb
Circumferential tense edema
Palpation
▶
Edema character
▶
Tense non-pitting edema
Exquisitely tender to palpation
Crepitus
▶
Absence helps exclude necrotizing fasciitis
Gas-forming infection ruled out
Compartment assessment
▶
Tense woody compartments
Pain with passive stretch of toes
Neurovascular assessment
▶
Pedal pulses
▶
Present in approximately 50% of PCD patients
Absent pulses indicate critical arteriolar compromise from elevated tissue pressure
Capillary refill
▶
Prolonged greater than 3 seconds
Compared to contralateral limb
Sensation
▶
Light touch and pinprick in toe web spaces
Loss suggests compartment syndrome
Motor function
▶
Toe dorsiflexion and plantar flexion
Weakness is a surgical emergency
Systemic examination
Cardiopulmonary
▶
Jugular venous distension
▶
Right heart strain from PE
Volume status assessment
Lung auscultation
▶
Pleural rub from PE
Crackles from pulmonary infarction
Abdominal and pelvic
▶
Abdominal mass palpation
▶
Pelvic mass compressing iliac veins
Retroperitoneal fullness
Lymphadenopathy
▶
Malignancy screening
Inguinal nodes
Contralateral limb
▶
Bilateral DVT assessment
▶
Bilateral involvement associated with worse prognosis
Symmetric or asymmetric swelling
Differential Diagnosis
Life threats requiring immediate distinction
Acute arterial limb ischemia
▶
ICD-10 I74.3 embolism and thrombosis of arteries of lower extremities
▶
6 P's: pain, pallor, pulselessness, poikilothermia, paresthesias, paralysis
Pallor not cyanosis; absent pulses from arterial not venous obstruction
Distinguishing features from PCD
▶
No massive edema in arterial ischemia
Cold pale limb versus swollen cyanotic limb
ABI below 0.4 mmHg indicates severe arterial ischemia
Necrotizing fasciitis
▶
ICD-10 M72.6
▶
Erythema, crepitus, blistering, rapidly spreading
Systemic toxicity, fever, hemodynamic instability
Distinguishing features
▶
CT showing gas in fascial planes
Absence of massive venous congestion pattern
Venous spectrum diagnoses
Deep venous thrombosis without phlegmasia
▶
ICD-10 I82.4 acute DVT of tibial veins
▶
Swelling and pain without cyanosis
No limb-threatening ischemia
Phlegmasia alba dolens stage
▶
ICD-10 I82.0
White swollen painful leg with spared collaterals
Precedes PCD in 50 to 60% of cases
Phlegmasia cerulea dolens
▶
ICD-10 I82.0 phlegmasia cerulea dolens
▶
Massive iliofemoral DVT with collateral involvement
Cyanosis, massive edema, severe pain triad
Venous gangrene (stage III)
▶
Irreversible tissue necrosis
Complicates 60 to 64% of PCD cases
Mortality above 33%
Other mimics
Cellulitis
▶
ICD-10 L03.116 cellulitis of left lower limb
▶
Erythema, warmth, tenderness, fever
No cyanosis and not massively swollen
D-dimer elevation absent or mild
▶
Ultrasound negative for DVT
Compartment syndrome (primary)
▶
ICD-10 M79.A1 acute compartment syndrome right leg
▶
Pain out of proportion to exam
Tense compartments without venous thrombosis on ultrasound
In PCD compartment syndrome is secondary to venous outflow obstruction
Symmetric peripheral gangrene or purpura fulminans
▶
ICD-10 D65 disseminated intravascular coagulation
▶
Bilateral symmetric acral necrosis in sepsis or DIC
No unilateral massive DVT
Ischemic limb gangrene with pulses
▶
Warfarin-induced skin necrosis pattern via protein C depletion
HIT-associated limb gangrene
Atheroembolism
▶
Blue toe syndrome with livedo reticularis
▶
Preserved pulses typically
Proximal atheromatous source on imaging
Laboratory Tests
Core coagulation and hematology
Complete blood count
▶
Thrombocytopenia as HIT or DIC marker
▶
Platelet count below 150 x 10^9/L warrants HIT probability scoring
DIC associated thrombocytopenia with microangiopathy
Leukocytosis from stress or underlying malignancy
▶
Extreme leukocytosis suggests hypercoagulable malignancy
Coagulation studies
▶
PT/INR
▶
Baseline before thrombolysis
DIC pattern with prolonged PT and low fibrinogen
aPTT
▶
Baseline before heparin initiation
Monitor during heparin infusion targeting 60 to 100 seconds
Fibrinogen
▶
Low in DIC
Needed before thrombolytic therapy planning
Thrombophilia workup
▶
Antiphospholipid antibody panel
▶
Lupus anticoagulant, anticardiolipin IgG/IgM, anti-beta2-glycoprotein I
Timing caveat: acute phase may affect results; recheck at 12 weeks
HIT panel (anti-PF4 antibody)
▶
Needed if heparin exposure within prior 100 days
Positive result mandates non-heparin anticoagulant switch
Protein C, protein S, antithrombin III
▶
Acute phase reactants reduce accuracy acutely
Consider deferring to outpatient follow up when clinically stable
Metabolic and organ function
Renal function
▶
Creatinine and eGFR
▶
Contrast planning for CT venography
Rhabdomyolysis assessment when compartment syndrome suspected
Electrolytes
▶
Hyperkalemia from tissue ischemia and cell lysis
Sodium and bicarbonate for acid-base assessment
Creatine kinase
▶
Elevated with compartment syndrome or rhabdomyolysis
▶
CK above 5000 units/L indicates significant muscle injury
Trend every 6 to 12 hours
Myoglobin
▶
Urine myoglobin for renal protection assessment
Aggressive hydration if significantly elevated
Tissue ischemia and systemic perfusion
Lactate
▶
Marker of tissue ischemia and systemic hypoperfusion
▶
Level above 2 mmol/l indicates significant ischemia
Repeat every 2 to 4 hours to trend
Metabolic acidosis is primary cause of death in PCD
▶
ABG or VBG for pH and bicarbonate trending
Lactate above 4 mmol/l indicates shock physiology
D-dimer
▶
Markedly elevated but nonspecific
▶
Not needed to confirm diagnosis when presentation is obvious
Useful if diagnosis uncertain and ultrasound unavailable acutely
Troponin and BNP
▶
Ordered when concurrent PE suspected
▶
Troponin elevation indicates right ventricular strain
BNP elevation with right heart pressure overload
Blood product preparation
Type and screen
▶
Anticipate need for blood products if thrombolysis or surgery planned
▶
Crossmatch if high bleeding risk anticipated
Platelets and FFP availability for DIC management
Diagnostic Tests
Scoring Systems
Clinical staging of phlegmasia spectrum
▶
Stage I phlegmasia alba dolens
▶
Edema without cyanosis
Collateral veins spared
Stage II phlegmasia cerulea dolens
▶
Edema with cyanosis but no gangrene
Collateral veins involved
Stage III venous gangrene
▶
Irreversible tissue necrosis
Highest mortality and amputation rates
4T score for HIT probability
▶
Thrombocytopenia magnitude and timing
▶
Fall of 30 to 50% from baseline scores 1 point
Fall above 50% scores 2 points
Thrombosis
▶
New confirmed thrombosis scores 2 points
Other causes of thrombocytopenia
▶
Score 0 to 8 total
Score above 5 indicates high HIT probability
Wells DVT score
▶
Active cancer
▶
1 point
Immobilization or paralysis
▶
1 point
Bedridden for 3 or more days or major surgery within 12 weeks
▶
1 point
Score above 2 high probability of DVT
▶
In PCD clinical diagnosis usually obvious without scoring
MRI
MRI venography
▶
Limited acute utility in PCD
▶
Time constraints in limb-threatening emergency
Motion artifact and patient instability risks
Problem-solving indications
▶
Complex pelvic anatomy when CT non-diagnostic
Soft tissue characterization of underlying pelvic mass
MRI for malignancy evaluation
▶
Pelvic MRI for suspected gynecologic malignancy
Can be deferred to post-stabilization phase
MRI contraindications
▶
Hemodynamically unstable patient
▶
Resuscitation cannot occur in MRI suite
Defer until clinically stable
Non-compatible metallic implants or devices
CT
CT venography (CTV)
▶
First-line cross-sectional imaging for PCD
▶
Defines full extent of thrombosis including iliocaval involvement
Iliocaval involvement in 93% of PCD cases
Identifies underlying causes
▶
May-Thurner compression anatomy
Pelvic masses and occult malignancy
Retroperitoneal pathology
Protocol considerations
▶
Venous phase acquisition required
Renal function assessment before contrast
CT pulmonary angiography
▶
Concurrent PE evaluation
▶
PE in up to 30% of PCD cases
Combined CTV and CTPA feasible in single acquisition
ACR Appropriateness Criteria support for cold painful leg evaluation
▶
CT angiography for arteriovenous differentiation
CT angiography lower extremity
▶
If arterial ischemia is concurrently suspected
▶
Differentiates acute arterial occlusion from venous disease
Perfusion pressure assessment at the ankle
Ultrasound
Duplex ultrasonography
▶
First-line diagnostic test for PCD
▶
Rapid bedside confirmation of extensive DVT
POCUS can detect rapidly evolving thrombus
Findings in PCD
▶
Non-compressible common femoral, iliac and popliteal veins
Absence of flow in iliofemoral segment
POCUS critical in ED
▶
Can identify thrombus even when formal duplex initially negative
Case report of negative duplex followed by PCD within minutes
Point-of-care ultrasound (POCUS) cardiac
▶
Right heart strain assessment for PE
▶
Dilated right ventricle with D-sign on short axis
McConnell sign: RV free wall akinesis with apical sparing
IVC assessment
▶
IVC dilation suggests elevated right-sided pressures
Fluid responsiveness limits in hypovolemic PCD patient
Ankle-brachial index with Doppler
▶
Perfusion pressure below 50 mmHg at ankle indicates limb ischemia
▶
Continuous-wave Doppler to assess arterial flow in affected limb
Guides fasciotomy and revascularization decision making
Disposition
Admission criteria
All PCD patients require immediate hospital admission
▶
ICU or step-down unit for hemodynamic monitoring
▶
Serial neurovascular checks every 1 to 2 hours
Vasopressor access and airway management capability
Vascular or endovascular suite proximity
▶
Catheter-directed thrombolysis suite availability
Surgical thrombectomy operating room readiness
Transfer criteria
Transfer to endovascular-capable center
▶
Mandatory if catheter-directed thrombolysis not available locally
▶
Do not delay heparin initiation pending transfer
Contact receiving vascular surgery and IR teams before departure
Air transport consideration
▶
Hemodynamically unstable patients may require ground transfer with resuscitation capability
Rapid transfer reduces amputation risk
Consultation requirements
Mandatory consultations
▶
Vascular surgery — immediate
▶
Surgical thrombectomy candidacy
Fasciotomy planning
Interventional radiology — immediate
▶
Catheter-directed thrombolysis candidacy
Pharmacomechanical thrombectomy planning
Hematology
▶
If HIT, DIC, or thrombophilia suspected
Anticoagulant selection in complex cases
Additional consultations
▶
Surgical oncology if underlying malignancy identified
Nephrology if severe rhabdomyolysis or contrast injury anticipated
Inpatient monitoring plan
Serial neurovascular examination every 1 to 2 hours
▶
Pulse, sensation, motor function of affected limb
▶
Document findings with time-stamps
Escalate immediately for any deterioration
Repeat imaging to assess thrombus resolution
▶
Duplex or CTV at 24 to 48 hours post-intervention
Compartment pressure monitoring
▶
Measure if clinical signs of compartment syndrome
▶
Pressures at or above 30 mmHg warrant fasciotomy after venous restoration
Pressures of 47 to 56 mmHg documented in PCD cases
Do not perform fasciotomy before thrombus removal
Treatment
Immediate resuscitation
Intravenous fluid resuscitation
▶
Large-bore IV access bilateral upper extremities
▶
Isotonic crystalloid bolus 1 to 2 litres initially
Reassess every 30 minutes
Target MAP above 65 mmHg
▶
Vasopressors if fluid-refractory hypotension
Norepinephrine 0.05 to 0.5 mcg/kg/minute titrated
Limb elevation
▶
Elevate affected limb above cardiac level
▶
Reduces venous hypertension
Do not apply compression wraps acutely
Anticoagulation
IV unfractionated heparin (UFH) — first-line anticoagulant
▶
Dosing regimen
▶
Bolus 80 units/kg IV over 1 to 2 minutes
Infusion 18 units/kg/hour continuous
Titration targets
▶
aPTT 60 to 100 seconds
Adjust every 6 hours based on aPTT result
Rationale for UFH preference
▶
Titratable and reversible
Short half-life in anticipation of procedural intervention
Preferred over LMWH in hemodynamically unstable patients
HIT management — non-heparin anticoagulants
▶
Argatroban IV
▶
2 mcg/kg/minute continuous infusion initial dose
Reduce to 0.5 mcg/kg/minute in hepatic impairment
Target aPTT 1.5 to 3 times baseline
Bivalirudin IV
▶
0.15 to 0.2 mg/kg/hour continuous infusion
Renal dose adjustment required
Target aPTT 1.5 to 2.5 times baseline
Warfarin caution
▶
Avoid early warfarin initiation in PCD
▶
Risk of warfarin-induced venous gangrene via protein C depletion
Especially dangerous in HIT and active malignancy contexts
If warfarin ultimately used, overlap with parenteral anticoagulation minimum 5 days
▶
Ensure INR therapeutic for at least 24 hours before stopping parenteral agent
Long-term anticoagulation transition
▶
DOACs preferred for most patients without contraindication
▶
Rivaroxaban 15 mg twice daily with food for 21 days then 20 mg daily
Apixaban 10 mg twice daily for 7 days then 5 mg twice daily
LMWH preferred for malignancy-associated VTE
▶
Enoxaparin 1 mg/kg subcutaneous every 12 hours
Weight-based dosing with anti-Xa monitoring in renal impairment
Endovascular and surgical thrombus removal
Catheter-directed thrombolysis (CDT)
▶
Strongly recommended as first-line for limb-threatening venous ischemia
▶
Grade 1A recommendation SVS/AVF guidelines
Endovenous debulking reduced amputation and death by 70% versus anticoagulation alone
Alteplase (tPA) CDT dosing
▶
0.5 to 1 mg/hour via infusion catheter embedded in thrombus
Duration 12 to 24 hours depending on thrombus resolution
UFH concurrent systemic anticoagulation at lower dose during CDT
CDT contraindications
▶
Active internal bleeding
Recent intracranial surgery or trauma within 3 months
Intracranial malignancy or AVM
Recent major surgery within 10 days relative contraindication
Monitoring during CDT
▶
Fibrinogen level every 6 hours; hold if below 1 g/L
aPTT and CBC every 6 hours
Neurological checks every 2 hours
Pharmacomechanical catheter-directed thrombectomy (PCDT)
▶
Combination of mechanical thrombus disruption and thrombolytic infusion
▶
AngioJet or Ekos ultrasound-accelerated CDT systems
May reduce thrombolytic exposure time and dose
SIR position statement supports endovascular management of acute iliofemoral DVT
▶
Society of Interventional Radiology 2023 position statement
Surgical thrombectomy
▶
Reserved for patients with absolute contraindications to thrombolysis
▶
Fogarty catheter thrombectomy under general or regional anesthesia
Intraoperative completion venography
Concurrent IVC filter placement if anticoagulation contraindicated
▶
Retrievable filter preferred
Consider when PE risk exceeds bleeding risk
Adjunctive interventions
Iliac vein stenting
▶
When May-Thurner compression identified after thrombus clearance
▶
Reduces reocclusion risk
Improves long-term venous patency
Self-expanding stent deployed under fluoroscopic guidance
▶
Antiplatelet therapy post-stenting per institutional protocol
IVC filter placement
▶
Consider if anticoagulation is contraindicated
▶
High risk of fatal PE without anticoagulation coverage
Retrievable filter if anticoagulation anticipated later
Not a substitute for anticoagulation when anticoagulation is feasible
Fasciotomy
▶
Only if compartment pressures remain above 30 mmHg despite successful venous outflow restoration
▶
Four-compartment lower leg fasciotomy when indicated
Should not precede or replace thrombus removal
Post-fasciotomy wound management
▶
Negative pressure wound therapy consideration
Delayed primary closure planning
Pain management
Opioid analgesia
▶
Morphine IV 0.1 mg/kg every 4 hours PRN
▶
Titrate to pain score below 4 out of 10
Fentanyl IV alternative for renal impairment
Refractory pain management
▶
IV lidocaine infusion reported as rescue analgesia
Ketamine subanesthetic dose 0.3 mg/kg IV bolus consideration
Positioning and comfort
▶
Limb elevation maintained
Avoid compression or tourniquet
Rhabdomyolysis management
Aggressive IV hydration
▶
Isotonic saline titrated to urine output above 0.5 mL/kg/hour
▶
Target 1 to 2 mL/kg/hour in significant rhabdomyolysis
Monitor for fluid overload in cardiac-compromised patients
Sodium bicarbonate consideration
▶
Alkalinize urine if severe rhabdomyolysis with myoglobinuria
Evidence limited; consider in pH below 6.5 on urine dipstick
Special Populations
Pregnancy
Pregnancy-specific considerations
▶
Increased VTE risk in pregnancy and postpartum
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Hypercoagulability, venous stasis, uterine compression of iliac veins
Left-sided predominance further increased by gravid uterus
PCD in pregnancy is rare but devastating
▶
Maternal mortality and fetal loss risk elevated
Multidisciplinary team: vascular surgery, MFM, hematology
Imaging approach in pregnancy
▶
Doppler ultrasound first-line — no radiation
▶
Limited visualization of iliac veins in advanced pregnancy
MRI without contrast preferred over CT when iliac imaging needed
▶
Avoid gadolinium in pregnancy
CT if MRI not available and maternal risk justifies fetal exposure
Anticoagulation in pregnancy
▶
IV UFH first-line in acute setting
▶
Does not cross placenta
Titratable for procedural management
LMWH for ongoing therapy
▶
Enoxaparin 1 mg/kg subcutaneous twice daily
Anti-Xa monitoring in pregnancy due to altered pharmacokinetics
DOACs contraindicated in pregnancy
▶
Cross placenta and fetal risk
Warfarin embryopathy risk in first trimester
Thrombolysis in pregnancy
▶
Relative contraindication but not absolute in limb-threatening ischemia
▶
Case-by-case multidisciplinary decision
Risk of placental abruption and fetal loss
Benefits may outweigh risks in true limb-threatening emergency
▶
Maternal oxygenation and circulation take priority
Informed consent documentation critical
Geriatric
Increased baseline VTE risk
▶
Malignancy prevalence higher in older adults
▶
Occult malignancy most common underlying etiology overall
Lower threshold for malignancy screening
Reduced venous tone and mobility
▶
Chronic venous insufficiency contributes
Baseline peripheral edema may mask early PCD signs
Bleeding risk assessment
▶
Frailty increases thrombolysis bleeding risk
▶
HAS-BLED and ATRIA scores may guide but not preclude treatment
Intracranial hemorrhage risk highest in older patients
Renal impairment common
▶
Adjust LMWH for creatinine clearance below 30 mL/minute
Anti-Xa monitoring for LMWH in significant renal impairment
Modified treatment approach
▶
Anticoagulation still indicated but careful monitoring
▶
UFH with close aPTT monitoring in renal impairment
Avoid DOACs with creatinine clearance below 15 mL/minute
Surgical and anesthetic risk higher
▶
Optimization before surgical thrombectomy when feasible
Regional anesthesia consideration
Functional and goals of care
▶
Prognosis discussion when baseline function severely impaired
▶
Goals of care conversation with patient and family
Comfort-focused approach may be appropriate in end-stage malignancy
Pediatrics
PCD in pediatric patients is exceedingly rare
▶
More commonly associated with
▶
Malignancy (leukemia, lymphoma)
Congenital thrombophilias
Central venous catheter complications
Neonatal and infant cases reported with sepsis-associated DIC
Weight-based anticoagulation
▶
UFH in neonates and infants
▶
Bolus 75 units/kg IV over 10 minutes
Infusion 28 units/kg/hour in neonates (under 1 year)
Infusion 20 units/kg/hour in children (over 1 year)
LMWH weight-based dosing
▶
Enoxaparin 1.5 mg/kg subcutaneous every 12 hours in infants
Enoxaparin 1 mg/kg subcutaneous every 12 hours in children
Anti-Xa target 0.5 to 1.0 units/mL for therapeutic dosing
Thrombolysis in children
▶
Alteplase 0.01 to 0.06 mg/kg/hour CDT
▶
Maximum dose 2 mg/hour
Pediatric hematology consultation mandatory
Contraindications similar to adults with age-specific cautions
▶
Recent intracranial surgery or intracranial pathology
Active bleeding or recent invasive procedure
Long-term considerations
▶
Thrombophilia workup critical in pediatric VTE
▶
Inherited thrombophilia more likely than in adults
Timing: defer protein C, S, antithrombin until off anticoagulation
Post-thrombotic syndrome monitoring
▶
Villalta scale adapted for pediatric use
Compression therapy and physiotherapy
Background
Epidemiology
Incidence and prevalence
▶
Rare complication of DVT
▶
Estimated 1 in 1 million per year in the general population
True incidence likely underestimated due to misdiagnosis
Demographics
▶
No strong sex predilection in most series
Median age 50 to 60 years in adult series
Malignancy association
▶
Present in majority of PCD cases
Reproductive system cancers most frequent malignancy type
Outcomes data
▶
Amputation rate up to 50% historically without modern intervention
▶
Endovascular techniques reduced amputation rate significantly
Endovenous debulking reduced amputation and death by 70%
Mortality 20 to 40%
▶
Primary cause of death: metabolic acidosis and multiorgan failure
Overall mortality in recent series approximately 18.75 to 40%
Venous gangrene complicates 60 to 64% of PCD cases
▶
Gangrene mortality above 33%
Bilateral limb involvement associated with worse prognosis
▶
Higher amputation and death rates when bilateral
Pathophysiology
Mechanism of venous outflow obstruction
▶
Massive iliofemoral DVT extending into collateral veins
▶
Near-complete venous outflow obstruction
Collateral venous channels thrombose progressively
Thrombosis spectrum progression
▶
Distal DVT to proximal DVT
Phlegmasia alba dolens (spared collaterals)
Phlegmasia cerulea dolens (collateral involvement)
Venous gangrene (irreversible tissue necrosis)
Downstream consequences of obstruction
▶
Venous hypertension
▶
Transmits to capillary and arteriolar level
Interstitial pressure rises dramatically
Massive fluid sequestration into the limb
▶
Several litres may accumulate acutely
Systemic hypovolemia and circulatory collapse
Arteriolar collapse
▶
Tissue pressure exceeds critical closing pressure of arterioles
Arterial perfusion ceases despite patent proximal arteries
Explains absent pedal pulses in 50% despite no arterial occlusion
Compartment syndrome mechanism
▶
Venous outflow obstruction raises compartment pressures
▶
Compartment pressures can increase 16-fold within 6 hours
Pressures of 47 to 56 mmHg documented in PCD
Ischemia-reperfusion injury upon thrombus clearance
▶
Reactive hyperemia and additional edema
Compartment pressure monitoring mandatory after intervention
Underlying triggers for massive thrombosis
▶
Virchow's triad: stasis, endothelial injury, hypercoagulability
▶
Malignancy activates coagulation cascade (tissue factor expression)
HIT creates platelet-rich thrombi at high platelet activation
May-Thurner anatomy accentuates left-sided stasis
▶
Right common iliac artery compresses left common iliac vein
Creates anatomic predisposition for left iliofemoral DVT
Therapeutic Considerations
Why early thrombus removal changes outcomes
▶
Anticoagulation alone prevents propagation but does not lyse clot
▶
Venous outflow obstruction persists without thrombus removal
Endovascular debulking reduces amputation and death by 70%
Catheter-directed approach preferred over systemic lysis
▶
Higher local drug concentration at thrombus
Lower systemic bleeding risk
Grade 1A SVS/AVF recommendation
HIT as both cause and complication
▶
HIT type II creates arterial and venous thrombosis
▶
Platelet-rich white clots resistant to standard anticoagulation
Heparin must be stopped immediately if HIT suspected
Non-heparin anticoagulants in HIT
▶
Argatroban preferred with hepatic dysfunction risk assessment
Bivalirudin preferred in renal impairment
Warfarin paradox in PCD
▶
Warfarin depletes protein C faster than procoagulant factors initially
▶
Creates paradoxical hypercoagulable state early in therapy
May precipitate venous gangrene in PCD, HIT, or malignancy contexts
Bridge with parenteral anticoagulation minimum 5 days and INR therapeutic
Post-thrombotic syndrome prevention
▶
AHA 2025 scientific statement on open vein hypothesis
▶
Maintaining venous patency reduces post-thrombotic syndrome
Early thrombus removal central to reducing long-term morbidity
Compression therapy after acute phase
▶
30 to 40 mmHg graduated compression stockings
Reduces venous hypertension and post-thrombotic symptoms
Villalta scale monitoring at follow-up
▶
Score above 5 indicates post-thrombotic syndrome
Score above 15 or presence of ulcer indicates severe PTS
Malignancy screening strategy
▶
Multimodal imaging recommended
▶
CT chest abdomen pelvis for occult malignancy
Targeted cancer-specific screening based on history
NCCN cancer-associated VTE guidelines
▶
LMWH or DOACs preferred for cancer-associated VTE over warfarin
NCCN 2026 updated guidelines
Patient Discharge Instructions
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Phlegmasia cerulea dolens home care after discharge
▶
Take all prescribed blood thinners exactly as directed
▶
Never skip doses; missed doses dramatically increase clot risk
Follow up blood tests as scheduled (INR if on warfarin, anti-Xa if on LMWH)
Wear compression stocking on the affected leg as prescribed
▶
Put stocking on before getting out of bed in morning
Remove at night before sleeping
Keep the affected leg elevated when resting
▶
Elevate above heart level when possible
Avoid prolonged sitting or standing without movement
Gentle activity as tolerated
▶
Short walks encouraged; avoid prolonged immobility
No high-impact activity until cleared by vascular surgeon
Warning signs — return to emergency department immediately
▶
Worsening swelling or new color change in the leg
▶
Blue, purple, or mottled discoloration worsening
Leg becoming harder or more tense
Numbness, tingling, or weakness in the leg
▶
Inability to move toes or foot
Burning pain in leg
Shortness of breath or chest pain
▶
Possible blood clot in lungs
Coughing up blood
Bleeding while on blood thinners
▶
Blood in urine or stool
Coughing or vomiting blood
Uncontrolled bleeding from any site
Signs of skin breakdown or infection in leg
▶
Blistering or open wound on leg
Increasing redness, warmth, or fever
Fainting, severe dizziness, or sudden confusion
Follow up appointments
▶
Vascular surgery within 1 to 2 weeks after discharge
▶
Repeat imaging to confirm thrombus resolution or response
Compression stocking fitting and compliance check
Anticoagulation clinic or primary care within 1 week
▶
Blood test scheduling
Medication side effect review
Cancer screening appointment if not yet completed
▶
Imaging and specialist referral as directed by hospital team
Post-thrombotic syndrome monitoring
▶
Expected leg swelling and discomfort for months after event
Symptoms improving over time with compliance
Activity and lifestyle
▶
Hydration maintenance
▶
Adequate oral fluid intake daily
Avoid prolonged dehydration especially with travel
Travel precautions while on anticoagulation
▶
Move legs and walk every 1 to 2 hours during long journeys
Compression stocking for flights above 4 hours
No NSAIDs unless instructed by your doctor
▶
Interact with blood thinners and increase bleeding risk
References
Guidelines and key sources
Society for Vascular Surgery and American Venous Forum
▶
Meissner MH et al. Early thrombus removal strategies for acute DVT
▶
Journal of Vascular Surgery 2012
Grade 1A recommendation for early thrombus removal in PCD
SVS Multidisciplinary Management Guide on Perioperative Care 2023
Society of Interventional Radiology
▶
Vedantham S et al. SIR Position Statement on Endovascular Management of Acute Iliofemoral DVT 2023
▶
Journal of Vascular and Interventional Radiology
Supports CDT and PCDT for limb-threatening venous ischemia
American Heart Association
▶
Li W et al. Revisiting the Open Vein Hypothesis. Circulation 2025
▶
AHA Scientific Statement on post-thrombotic syndrome reduction
Early thrombus removal and venous patency maintenance
National Comprehensive Cancer Network
▶
NCCN Cancer-Associated Venous Thromboembolic Disease Guidelines 2026
▶
LMWH or DOAC preferred over warfarin in malignancy-associated VTE
ACR Appropriateness Criteria
▶
Browne WF et al. Sudden Onset of Cold Painful Leg 2023 Update
▶
Journal of the American College of Radiology
Key evidence sources
Feng Y, Fan G, Song W, et al.
▶
Unraveling the Risk Factors, Prognostic Predictors, and Evolving Therapeutic Approaches for PCD Over 30 Years
▶
Annals of Medicine 2025
Amputation rate up to 50% and mortality 20 to 40%
Warkentin TE. Ischemic Limb Gangrene with Pulses
▶
New England Journal of Medicine 2015
▶
HIT-associated limb gangrene mechanism and warfarin paradox
Unger A. From Negative Duplex to Phlegmasia in Minutes
▶
Journal of Clinical Ultrasound 2026
▶
POCUS identification of rapidly evolving thrombus in May-Thurner syndrome
Qvarfordt P, Eklof B, Ohlin P. Intramuscular Pressure in DVT and PCD
▶
Annals of Surgery 1983
▶
Compartment pressures 47 to 56 mmHg documented in PCD
Khan F, Tritschler T, Kahn SR, Rodger MA. Venous Thromboembolism
▶
Lancet 2021
▶
Comprehensive VTE management review
Coding reference
▶
ICD-10 I82.0 Budd-Chiari syndrome and phlegmasia cerulea dolens
▶
SNOMED CT concept: phlegmasia cerulea dolens (disorder)
SymptomDx is an educational tool for medical professionals. It does not replace clinical judgment. Verify all clinical data and drug dosages with authoritative sources.
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Management Protocols
Phlegmasia Cerulea Dolens