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Related Experiment Videos

Duplex scanning in post-operative surgical patients

A Nicolaides1, E Kalodiki

  • 1Irvine Laboratory, St Mary's Hospital Medical School, London, UK.

Haemostasis
|March 1, 1993
PubMed
Summary

Duplex ultrasound scanning effectively diagnoses deep venous thrombosis (DVT), with color flow imaging improving accuracy, especially for calf DVT. This non-invasive technique shows promise for screening asymptomatic patients.

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Area of Science:

  • Vascular Ultrasound
  • Diagnostic Imaging

Background:

  • Deep venous thrombosis (DVT) diagnosis relies on imaging techniques.
  • Duplex scanning has evolved through distinct developmental stages.

Purpose of the Study:

  • To evaluate the diagnostic performance of duplex scanning for deep venous thrombosis (DVT).
  • To assess the impact of technological advancements on DVT detection accuracy.

Main Methods:

  • B-mode imaging with compression.
  • Doppler ultrasound interrogation of venous lumen.
  • Color flow imaging integration.

Main Results:

  • Sensitivities and specificities exceeding 90% for proximal DVT in symptomatic patients across all methods.
  • Color flow imaging achieved 86% sensitivity and 91% specificity for calf DVT in symptomatic patients.
  • Improved accuracy for detecting old thrombi in asymptomatic patients with color flow imaging (proximal DVT >90%, calf DVT 79% sensitivity, 97% specificity).

Conclusions:

  • Duplex scanning, particularly with color flow imaging, is a highly accurate non-invasive method for diagnosing DVT.
  • Color flow imaging enhances sensitivity and specificity for both proximal and calf DVT.
  • Further validation may establish duplex scanning as a standard for screening asymptomatic patients.

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