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Impedance plethysmography: correlation with contrast venography
Radiology
|December 1, 1977
Summary
Impedance plethysmography accurately detects proximal deep vein thrombosis in lower limbs. This noninvasive test shows high sensitivity for acute deep vein occlusion, aiding clinical diagnosis.
Area of Science:
- Vascular Medicine
- Diagnostic Imaging
- Medical Technology
Background:
- Deep venous occlusion in lower limbs poses significant health risks.
- Accurate and noninvasive diagnostic methods are crucial for timely intervention.
Purpose of the Study:
- To evaluate the diagnostic accuracy of impedance plethysmography (IP) for deep venous occlusion.
- To compare IP results with ascending contrast venography in a large cohort.
Main Methods:
- A comparative study involving 315 lower limbs.
- Ascending contrast venography served as the gold standard.
- Impedance plethysmography was performed as a noninvasive diagnostic test.
Main Results:
- IP demonstrated high sensitivity for proximal deep vein thrombosis (97.5% in 79 limbs).
- IP showed lower sensitivity for calf-isolated thrombosis (22.2% in 27 limbs).
- A low false-positive rate of 4.3% (7 of 161 normal venograms) was observed.
Conclusions:
- Impedance plethysmography is a reliable noninvasive tool for diagnosing proximal deep vein thrombosis.
- IP's utility is limited for calf-isolated deep vein thrombosis.
- The findings support IP's role in the clinical evaluation of lower limb venous occlusion.