Predicting Outcomes of PAD Patients Undergoing Endovascular Intervention With CTA

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This is a prospective, observational, multi-center, clinical study examining predictors of clinical outcomes for patients undergoing PAD endovascular treatment. The study population will undergo lower extremity computed tomographic angiography (CTA )and endovascular intervention procedures. CT scann...

This is a prospective, observational, multi-center, clinical study examining predictors of clinical outcomes for patients undergoing PAD endovascular treatment. The study population will undergo lower extremity computed tomographic angiography (CTA )and endovascular intervention procedures. CT scanning was performed with the coverage from the common iliac artery bifurcation to the tiptoe, CTA data were transfer to an offline workstation for further analysis. Axial images, cross-sectional views, curved planar reformations and multiplane reformations, as well as three dimensional maximum intensity projection images were available for evaluation. This includes disease in a vessel located proximal(involving the aortoiliac and femoropopliteal locations), distal, (involving the infrapopliteal location), proximal and distal (multilevel disease). We conduct a detailed chart review to gather the data related to the index endovascular intervention procedures report, study personnel history and physical presentation, laboratory inspection, the lesion characteristics arising from CTA. Data abstract from chart review include indication for procedure (intermittent claudication, rest pain, and tissue loss), detailed lesion characteristics (lesion length, stenosis severity, diameter, and presence of total occlusion), procedure(s) performed and devices used, and per procedural events. Patients will be followed up for the occurrence of these outcomes from the time of their initial revascularization procedure(1month after enrollment, and at months 3 (+- 2 weeks), 6 (+- 2 weeks), and 12 (+- 2 weeks)). The follow-up of Clinical outcomes : Primary clinical outcomes of interest were ?1?restenosis in the treated segment?Restenosis was defined as a reduction in the luminal diameter of more than 50 percent according to any imaging examinations such as duplex ultrasound, CTA,magnetic resonance Imaging(MRI) or digital subtraction angiography(DSA) ??2?re-intervention in the treated segment for the clinical progression. Secondary end points included:1) all lower extremity amputation, 2) all -cause death, myocardial infarction, and stroke; 3) a neo- segment more than 75 % stenosis and clinical assessment requires intervention . Cox proportional hazards models were created to show the hazard ratios (HRs) associated with lesion characters and patient demographic and clinical characteristics ,and further identify predictors of clinical outcomes, moreover, plotted unadjusted Kaplan Meier curves for lower extremity peripheral artery patients undergone endovascular revascularization.

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