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Validation of a non-invasive method for localization of atherosclerotic occlusive disease in the legs
Insights
Non-invasive Doppler ultrasound accurately detects significant leg arterial disease, showing high accuracy for aorto-iliac and femoro-popliteal stenosis. However, it is less effective for identifying calf arterial disease.
Area of Science:
- Vascular Surgery
- Diagnostic Imaging
- Non-invasive Vascular Assessment
Background:
- Peripheral arterial disease (PAD) significantly impacts patient mobility and quality of life.
- Accurate diagnosis of haemodynamically significant arterial stenosis is crucial for effective treatment planning.
- Angiography, while definitive, is invasive and carries associated risks.
Purpose of the Study:
- To evaluate the diagnostic accuracy of combining segmental blood pressure measurements with Doppler shift ultrasound for detecting significant leg arterial occlusive disease.
- To compare the accuracy of this non-invasive method against angiography for aorto-iliac and femoro-popliteal disease.
- To assess the utility of this combined technique in identifying stenosis of greater than or equal to 50%.
Main Methods:
- A prospective study involving 50 patients (100 legs) with suspected lower limb arterial disease.
- Utilized segmental blood pressure measurements and Doppler ultrasound pulse evaluation.
- Angiography served as the gold standard reference method for comparison.
Main Results:
- High diagnostic accuracy for aorto-iliac disease (87% overall, 72% sensitivity, 97% specificity).
- High diagnostic accuracy for femoro-popliteal disease (85% overall, 87% sensitivity, 78% specificity).
- Positive diagnosis accuracy reached 93% for both aorto-iliac and femoro-popliteal disease levels. Calf disease detection accuracy was poor.
Conclusions:
- Combined segmental blood pressure and Doppler ultrasound is a highly accurate non-invasive method for diagnosing significant aorto-iliac and femoro-popliteal arterial stenosis.
- This technique offers a reliable alternative to invasive angiography for assessing proximal leg arterial disease.
- Further investigation is needed to improve the detection of arterial disease in the calf region using non-invasive methods.
Abstract:
The accuracy in determining the level of haemodynamically significant occlusive arterial disease (stenosis of greater than or equal to 50%) in the leg by a combination of segmental blood pressure measurements and evaluation of pulses with the Doppler shift technique was assessed in 50 patients (100 legs), using angiography as the reference method. For aorto-iliac disease the sensitivity was 72%, the specificity 97% and the diagnostic accuracy 87%. For femoro-popliteal disease the corresponding figures were 87%, 78% and 85%, respectively. The accuracy of a positive diagnosis was 93% for both levels. Similar results were obtained for combined aorto-iliac and femoro-popliteal disease. The accuracy in detecting calf disease was poor.