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Hyperaemic colour duplex scanning for the detection of aortoiliac stenoses. A comparative study with intra-arterial
B H Elsman1, D A Legemate, H J de Vos
1Department of Vascular Surgery, Utrecht University Hospital, The Netherlands.
Insights
Duplex ultrasound parameters, specifically peak systolic velocity (PSV) and end diastolic velocity (EDV) after exercise, can accurately assess aortoiliac stenosis severity. These Doppler-derived measurements improve upon resting assessments for hemodynamic significance.
Area of Science:
- Vascular Surgery
- Diagnostic Imaging
- Hemodynamics
Background:
- Intra-arterial pressure measurement is the gold standard for evaluating aortoiliac lesion significance.
- Duplex scanning alone sometimes fails to identify hemodynamically significant lesions.
Purpose of the Study:
- To enhance duplex scanning's accuracy in assessing aortoiliac stenosis.
- To compare flow-related duplex parameters (delta PSV, EDV) with pressure gradients before and during increased blood flow.
Main Methods:
- Prospective study of 45 aortoiliac segments with isolated stenosis.
- Doppler sampling at stenosis site at rest and post-exercise.
- Intra-arterial pressure measurement at rest and during induced hyperemia.
Main Results:
- Resting delta PSV (delta PSVr) at 1.6 m/s had 85% sensitivity and 88% specificity.
- Exercise delta PSV (delta PSVe) at 1.6 m/s achieved 100% sensitivity with slightly reduced specificity.
- Exercise end diastolic velocity (EDVe) provided crucial information at velocities ≤0.5 m/s or ≥1.6 m/s.
Conclusions:
- Delta PSV and EDV after exercise are valuable for assessing aortoiliac stenosis hemodynamic significance.
- Exercise-enhanced Doppler parameters improve diagnostic capability over resting measurements.
Objectives:
Intra-arterial pressure measurement is considered the "gold standard" for the haemodynamic evaluation of aortoiliac lesions. When compared to pressure measurement duplex scanning fails to detect some of the haemodynamically significant lesions. To improve the assessment of the haemodynamic significance of these lesions by duplex scanning, the flow-related duplex parameters delta PSV and EDV at rest and after exercise were compared with intra-arterial pressure gradients before and during increased blood flow.
Patients And Methods:
Forty-five aortoiliac segments with an isolated stenosis were studied prospectively. Doppler samples were taken at the site of the stenosis both at rest and after exercise on a bicycle ergometer, followed by intraarterial pressure measurement at rest and during pharmacologically induced increased blood flow.
Results:
At rest a delta PSV (delta PSVr) of 1.6 m/s showed a sensitivity and specificity of 85% and 88%, respectively. After exercise a delta PSV (delta PSVe) of 1.6 m/s showed a sensitivity of 100% at the cost of only a slight reduction in specificity when compared to delta PSVr. The end diastolic velocity at rest (EDVr) had only limited clinical value. The EDV after exercise (EDVe) provided important information if the velocity was 0.5 m/s or lower or if the velocity was 1.6 m/s or greater.
Conclusion:
The delta PSV and the EDV after exercise can be of value in the assessment of the haemodynamic significance of aortoiliac stenoses.