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Doppler ultrasound assessment of the femoro-popliteal segment: comparison of different methods using ROC curve
Insights
Assessing femoro-popliteal disease is crucial for vascular surgery success. Normalized transit time is the best noninvasive Doppler method for evaluating this, outperforming pulsatility index damping factor.
Area of Science:
- Vascular Surgery
- Noninvasive Diagnostic Methods
- Hemodynamics
Background:
- Coexisting aorto-iliac and femoro-popliteal occlusive lesions present challenges in vascular surgery.
- Standard arteriography lacks detail on the relative contribution of these lesions to patient symptoms.
- Successful proximal reconstruction hinges on understanding the hemodynamic significance of remaining femoro-popliteal disease.
Purpose of the Study:
- To evaluate and compare the efficacy of noninvasive Doppler methods for hemodynamic assessment of the femoro-popliteal segment.
- To identify the most accurate noninvasive test for determining the significance of femoro-popliteal disease in patients with combined aorto-iliac and femoro-popliteal lesions.
Main Methods:
- Studied 72 limbs from 38 patients with coexisting aorto-iliac and femoro-popliteal occlusive disease.
- Utilized several noninvasive Doppler techniques for hemodynamic assessment.
- Employed receiver operating characteristic (ROC) curve analysis for comparative results.
Main Results:
- Normalized transit time demonstrated superior diagnostic accuracy compared to pulsatility index damping factor (p < 0.01).
- Normalized transit time was identified as the best single noninvasive Doppler test in this patient cohort.
- Combining normalized transit time with damping factor showed a trend towards improvement, but not statistically significant in clinically relevant ROC curve regions.
Conclusions:
- Normalized transit time is a highly effective noninvasive method for assessing femoro-popliteal disease significance.
- This finding aids in surgical planning for patients with combined aorto-iliac and femoro-popliteal occlusive lesions.
- Further research may explore optimizing combined Doppler parameters for enhanced diagnostic precision.
Abstract:
Coexisting aorto-iliac and femoro-popliteal occlusive lesions remain a problem in vascular surgery. Arteriography does not provide information on their relative contributions to the presenting symptoms. The success of proximal reconstruction alone in such cases depends to some extent on the haemodynamic significance of the femoro-popliteal disease which will remain. Several noninvasive Doppler methods have been recommended for haemodynamic assessment of the femoro-popliteal segment. These methods were studied in 72 limbs of 38 patients. The results are compared using receiver operating characteristic curve analysis. The best single test in this group of patients was normalised transit time which was significantly better than pulsatility index damping factor (p less than 0.01). The addition of damping factor to normalised transit time tended to give some improvement but this was not statistically significant in the clinically relevant part of the ROC curve.