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Monitoring functional patency of percutaneous transluminal angioplasty
E V Kinney1, D F Bandyk, M W Mewissen
1Surgical Service, Clement J. Zablocki Veterans Affairs Medical Center, Milwaukee, WI.
Insights
Duplex ultrasound effectively monitors lower limb angioplasty success. Residual stenosis over 50% predicts restenosis, while less than 50% indicates durable results, even in high-risk patients.
Area of Science:
- Vascular Surgery
- Interventional Radiology
- Non-invasive Vascular Imaging
Background:
- Percutaneous transluminal angioplasty (PTA) is a common treatment for lower limb arterial disease.
- Accurate post-procedure assessment is crucial for predicting long-term outcomes.
- Non-invasive methods like duplex scanning offer serial hemodynamic monitoring.
Purpose of the Study:
- To evaluate the utility of duplex scanning and Doppler-derived blood pressure measurements in monitoring lower limb hemodynamics after PTA.
- To determine the correlation between residual stenosis identified by duplex scanning and long-term clinical outcomes.
- To assess the durability of PTA based on the degree of residual stenosis.
Main Methods:
- Serial monitoring of lower limb hemodynamics using duplex scanning and Doppler-derived blood pressure measurements.
- Evaluation of 90 PTA sites judged satisfactory by arteriography in 73 patients.
- Assessment of residual stenosis (20-49% and >50% diameter reduction) within 1 week post-angioplasty.
Main Results:
- Significant hemodynamic improvement was observed in 90% of limbs, with 86% achieving both hemodynamic and clinical improvement.
- Duplex scanning identified moderate or severe residual stenosis in 63% of balloon-dilated segments.
- Residual stenosis >50% predicted restenosis and late clinical failure (11% success at 1 year), whereas <50% stenosis indicated durable results (80% success at 2 years).
Conclusions:
- Duplex scanning is a valuable tool for assessing residual stenosis after lower limb PTA.
- The degree of residual stenosis is a critical predictor of long-term PTA success and durability.
- Maintaining residual stenosis <50% ensures favorable outcomes, irrespective of patient comorbidities like critical ischemia, poor runoff, or diabetes mellitus.
Abstract:
Duplex scanning and Doppler-derived blood pressure measurements were used to serially monitor lower limb hemodynamics in 73 patients who underwent percutaneous transluminal angioplasty. Ninety percutaneous transluminal angioplasty sites judged technically satisfactory by arteriography were evaluated. Significant hemodynamic improvement was seen in 81 (90%) of the 90 limbs, although both hemodynamic and clinical improvement were achieved in only 77 (86%) limbs. Duplex scanning within 1 week of successful angioplasty identified moderate (20% to 49% diameter reduction) or severe (greater than 50% diameter reduction) residual stenosis in 49 (63%) of 77 balloon-dilated arterial segments. The presence of a greater than 50% diameter reduction residual stenosis predicted further restenosis and late clinical failure (11% success rate at 1 year). When the degree of residual stenosis at the percutaneous transluminal angioplasty site was less than 50% diameter reduction by duplex scanning, the procedure was durable (80% success rate at 2 years), even in patients with critical ischemia, poor runoff, or diabetes mellitus.