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Approach to peripheral edema

The same eight steps, every presentation: threats first, then the history and exam that discriminate, one honest sentence, a mechanism-grouped differential, and the tests read in order.

  1. Immediate threats

    • Unilateral swelling is DVT until reasoned otherwise
    • Edema with orthopnea and hypoxia: decompensated heart failure
    • Anasarca with frothy urine: nephrotic range proteinuria

  2. History that discriminates

    • One leg or both: the single most useful question
    • Tempo: days (thrombosis, failure) versus months (venous insufficiency, lymphedema)
    • Orthopnea and PND; alcohol and liver history; new drugs (amlodipine, NSAIDs, glitazones)
    • Urine frothing and periorbital morning swelling

  3. Examination

    • Pitting versus non-pitting; height of the edema
    • JVP: the honest volume gauge at the bedside
    • Signs of the three organs: heart (S3, crackles), liver (ascites, stigmata), kidney (periorbital)
    • Calf tenderness and circumference when unilateral

  4. Problem representation

    Bilateral pitting edema with raised JVP and orthopnea (cardiac) versus bilateral edema with normal JVP, heavy proteinuria and low albumin (nephrotic) versus a single swollen calf after immobilization (DVT).

  5. Differential, by mechanism

    Unilateral

    • DVT
    • Cellulitis
    • Baker's cyst rupture
    • Lymphedema

    Bilateral, raised JVP

    • Heart failure
    • Cor pulmonale
    • Constriction/tamponade

    Bilateral, normal JVP

    • Nephrotic syndrome
    • Cirrhosis
    • Hypoalbuminemia
    • Drugs
    • Venous insufficiency

  6. Investigations

    • Unilateral: Wells-gated D-dimer or ultrasound
    • Bilateral: BNP, albumin, urinalysis with quantified protein, liver panel
    • Echo when the JVP or story points at the heart

  7. Interpretation

    • JVP plus urine protein sorts most bilateral edema into heart, kidney, or liver
    • The drug chart explains more edema than any echo: look there first

  8. Next steps

    • Treat the system at fault; diuretics without a diagnosis is symptom management, not treatment
    • Daily weights beat leg circumference for following response

Connected

CompareNephritic vs nephroticCompareHFrEF vs HFpEFCalculatorWells (PE)

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