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==Background==
==Background==
*Definition: existence of the excess fluid in the lower extremity resulting in swelling of the feet and extending upward
*Unilateral leg swelling is a common ED complaint<ref>Markarian B, et al. Assessment Modalities for Lower Extremity Edema, Lymphedema, and Lipedema: A Scoping Review. Cureus. 2024 Mar;16(3):e55906. PMID 38601427</ref>
**Further classified as pitting (depress-able) and non-pitting  
*The critical EM concern is ruling out [[deep vein thrombosis]] (DVT), which can lead to [[pulmonary embolism]]<ref>Schellong SM, et al. [Leg swelling]. Internist (Berl). 2013 Nov;54(11):1294-303. PMID 24264570</ref>
 
*Other important causes include [[cellulitis]], [[compartment syndrome]], ruptured [[Baker's cyst]], and [[necrotizing fasciitis]]
*Further classified as pitting (compressible) and non-pitting (lymphedema, myxedema)
{{Causes Pedal Edema}}
{{Causes Pedal Edema}}


==Clinical Features==
==Clinical Features==
===History===
*Onset: acute (DVT, cellulitis, compartment syndrome) vs. chronic (venous insufficiency, lymphedema)
*Pain: DVT (calf tenderness), cellulitis (diffuse), compartment syndrome (severe, out of proportion)
*Skin changes: erythema, warmth, skin break, ulceration
*Recent surgery, immobilization, travel, hospitalization, malignancy (DVT risk factors)
*History of DVT/PE
*Fever (infection)
*Trauma (compartment syndrome, fracture)
===Physical Exam===
[[File:PedalEdema.jpg|thumb|Pitting pedal edema]]
[[File:PedalEdema.jpg|thumb|Pitting pedal edema]]
*Unilateral leg swelling
*Measure and compare calf circumferences (>3cm difference is significant)
*Assess for pitting vs. non-pitting edema
*Skin: erythema, warmth, crepitus, bullae, ecchymosis, skin breaks
*Palpate pulses (arterial disease)
*Assess compartments for firmness, pain with passive stretch (compartment syndrome)
*Homan sign (calf pain with dorsiflexion) — poor sensitivity and specificity, not reliable
 
===Red Flags===
*[[Compartment syndrome]]: pain out of proportion, tense swelling, pain with passive stretch, paresthesias
*[[Necrotizing fasciitis]]: pain out of proportion, crepitus, rapidly spreading erythema, systemic toxicity
*Phlegmasia cerulea dolens: massive DVT with cyanotic, severely swollen limb, risk of limb loss


==Differential Diagnosis==
==Differential Diagnosis==
===[[Pedal edema]]===
{{Unilateral leg swelling DDX}}
[[File:Differential Diagnosis of Lower Extremity Edema.png|thumb|Differential Diagnosis of Pedal Edema]]
*Gravitational
*Venous insufufficiency/[[thrombophlebitis]]
*Drugs
**[[NSAIDS]]
**Birth control
**[[Steroids]]
*[[CHF]]
*Lymphedema
*[[Pretibial myxedema]]
*[[Renal failure]]
*[[Liver failure]]
*[[DVT]]


==Evaluation==
==Evaluation==
*Ultrasound rule-out DVT
===DVT Assessment===
*Consider x-rays
*Apply Wells criteria for DVT pretest probability
**Low probability: obtain [[D-dimer]]; if negative, DVT effectively excluded
**Moderate/high probability: proceed directly to [[DVT ultrasound|compression ultrasound]]
*[[DVT ultrasound]] (compression ultrasound) is the diagnostic study of choice
**Sensitivity >95% for proximal DVT
**If negative but clinical suspicion remains high, consider repeat in 5-7 days or whole-leg ultrasound
 
===Infection Assessment===
*[[CBC]] with differential, [[BMP]]
*Blood cultures if systemic signs of infection or concern for bacteremia
*[[Lactate]] if concern for [[sepsis]] or [[necrotizing fasciitis]]
*Consider CT or MRI if deep space infection or abscess suspected
*X-ray if concern for gas in soft tissues ([[necrotizing fasciitis]], gas gangrene)
 
===Other===
*[[Knee X-ray]]: if trauma or concern for fracture
*POCUS: assess for DVT at bedside, popliteal (Baker's) cyst
*Consider CT venography if ultrasound nondiagnostic and clinical suspicion high
*Compartment pressures if [[compartment syndrome]] suspected (or clinical diagnosis if classic findings)


==Management==
==Management==
*Treatment is based on addressing underlying disease process
===DVT===
*Idiopathic edema is a diagnosis of exclusion.  Other disease process, including heart failure, cirrhosis, acute renal failure, nephrotic syndrome, chronic venous insufficiency, and medication induced edema must first be considered.<ref>Kay A, Davis CL. Idiopathic Edema. American Journal of Kidney Disease. 1999; 34(3): 405-408.</ref>
*Anticoagulation: see [[Deep vein thrombosis]] for detailed management
**Idiopathic pedal edema need not to be treated with diuretics
*Elevation, analgesia
*Emergent vascular surgery consultation for phlegmasia cerulea dolens (may need catheter-directed thrombolysis or thrombectomy)
 
===Cellulitis===
*Antibiotics based on severity (see [[Cellulitis]])
*Outpatient oral antibiotics for uncomplicated
*IV antibiotics for systemic signs, failed outpatient therapy, or immunocompromised
 
===Compartment Syndrome===
*Emergent surgical consultation for fasciotomy
*Remove all constrictive dressings/casts
*Do not elevate above heart level
 
===Necrotizing Fasciitis===
*Emergent surgical debridement
*Broad-spectrum IV antibiotics
*See [[Necrotizing fasciitis]]
 
===Baker's Cyst Rupture===
*Conservative management: rest, elevation, NSAIDs, compression
*Must rule out DVT (can coexist)


==Disposition==
==Disposition==
*If no respiratory symptoms, most patients may be safely discharged home
===Admit===
**Patients should be followed up in medical clinic for further investigation and care
*Proximal DVT with hemodynamic compromise or phlegmasia
*[[Compartment syndrome]] (to OR)
*[[Necrotizing fasciitis]] (to OR)
*Cellulitis requiring IV antibiotics
*Sepsis from lower extremity source
 
===Discharge===
*Uncomplicated DVT: can be managed outpatient with anticoagulation if reliable patient and adequate follow-up
*Uncomplicated cellulitis responding to oral antibiotics
*Baker's cyst rupture with DVT excluded
*Chronic venous insufficiency: compression stockings, elevation, outpatient follow-up
*Return precautions: worsening swelling, increasing pain, shortness of breath or chest pain (PE concern), fever, skin color changes


==See Also==
==See Also==
*[[Bilateral pedal edema]]
*[[Deep vein thrombosis]]
*[[Bilateral leg swelling]]
*[[Cellulitis]]
*[[Compartment syndrome]]
*[[Necrotizing fasciitis]]


==External Links==
==External Links==

Revisión actual - 10:44 22 mar 2026

Background


Causes of pedal edema

Mechanisms of Pedal Edema
  • Increased hydrostatic pressure
  • Decreased oncotic pressure
  • Increased capillary permeability
  • Lymphatic obstruction

Clinical Features

History

  • Onset: acute (DVT, cellulitis, compartment syndrome) vs. chronic (venous insufficiency, lymphedema)
  • Pain: DVT (calf tenderness), cellulitis (diffuse), compartment syndrome (severe, out of proportion)
  • Skin changes: erythema, warmth, skin break, ulceration
  • Recent surgery, immobilization, travel, hospitalization, malignancy (DVT risk factors)
  • History of DVT/PE
  • Fever (infection)
  • Trauma (compartment syndrome, fracture)

Physical Exam

Pitting pedal edema
  • Measure and compare calf circumferences (>3cm difference is significant)
  • Assess for pitting vs. non-pitting edema
  • Skin: erythema, warmth, crepitus, bullae, ecchymosis, skin breaks
  • Palpate pulses (arterial disease)
  • Assess compartments for firmness, pain with passive stretch (compartment syndrome)
  • Homan sign (calf pain with dorsiflexion) — poor sensitivity and specificity, not reliable

Red Flags

  • Compartment syndrome: pain out of proportion, tense swelling, pain with passive stretch, paresthesias
  • Necrotizing fasciitis: pain out of proportion, crepitus, rapidly spreading erythema, systemic toxicity
  • Phlegmasia cerulea dolens: massive DVT with cyanotic, severely swollen limb, risk of limb loss

Differential Diagnosis

Unilateral leg swelling

Differential Diagnosis of Pedal Edema

Evaluation

DVT Assessment

  • Apply Wells criteria for DVT pretest probability
  • DVT ultrasound (compression ultrasound) is the diagnostic study of choice
    • Sensitivity >95% for proximal DVT
    • If negative but clinical suspicion remains high, consider repeat in 5-7 days or whole-leg ultrasound

Infection Assessment

Other

  • Knee X-ray: if trauma or concern for fracture
  • POCUS: assess for DVT at bedside, popliteal (Baker's) cyst
  • Consider CT venography if ultrasound nondiagnostic and clinical suspicion high
  • Compartment pressures if compartment syndrome suspected (or clinical diagnosis if classic findings)

Management

DVT

  • Anticoagulation: see Deep vein thrombosis for detailed management
  • Elevation, analgesia
  • Emergent vascular surgery consultation for phlegmasia cerulea dolens (may need catheter-directed thrombolysis or thrombectomy)

Cellulitis

  • Antibiotics based on severity (see Cellulitis)
  • Outpatient oral antibiotics for uncomplicated
  • IV antibiotics for systemic signs, failed outpatient therapy, or immunocompromised

Compartment Syndrome

  • Emergent surgical consultation for fasciotomy
  • Remove all constrictive dressings/casts
  • Do not elevate above heart level

Necrotizing Fasciitis

Baker's Cyst Rupture

  • Conservative management: rest, elevation, NSAIDs, compression
  • Must rule out DVT (can coexist)

Disposition

Admit

Discharge

  • Uncomplicated DVT: can be managed outpatient with anticoagulation if reliable patient and adequate follow-up
  • Uncomplicated cellulitis responding to oral antibiotics
  • Baker's cyst rupture with DVT excluded
  • Chronic venous insufficiency: compression stockings, elevation, outpatient follow-up
  • Return precautions: worsening swelling, increasing pain, shortness of breath or chest pain (PE concern), fever, skin color changes

See Also

External Links

References

  1. ↑ Markarian B, et al. Assessment Modalities for Lower Extremity Edema, Lymphedema, and Lipedema: A Scoping Review. Cureus. 2024 Mar;16(3):e55906. PMID 38601427
  2. ↑ Schellong SM, et al. [Leg swelling]. Internist (Berl). 2013 Nov;54(11):1294-303. PMID 24264570
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