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Impedance Plethysmography

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Impedance Plethysmography

  • See Also
  1. Compression Ultrasonography
  • Indications
  1. Deep Vein Thrombosis
  2. Suspected Pulmonary Embolism
    1. Moderate PE Probability with negative CT Angiography, positive D-Dimer and negative Compression Ultrasonography
    2. DVT responsible for up to 90% of pulmonary emboli
  • Technique
  1. Thigh cuff inflated and change in calf Blood Volume measured
  • Efficacy
  • DVT Diagnosis
  1. Test Sensitivity: 91%
  2. Test Specificity: 96%
  • Interpretation
  1. Deep Vein Thrombosis
  2. False Positives
    1. Venous Insufficiency
    2. Congestive Heart Failure
    3. Peripheral artery disease