Lipoprotein(a) and Other Serum Lipid Subfractions Influencing Primary Patency After Infrainguinal Percutaneous Transluminal Angioplasty

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Abstract

Purpose:

To evaluate the influence of serum lipid subfraction concentrations on arterial patency after percutaneous transluminal angioplasty (PTA) in patients with infrainguinal peripheral artery occlusive disease (PAOD).

Methods:

From January 2007 to June 2008, a prospective study was conducted involving 39 patients (29 men; mean age 68.6±10.0 years) with infrainguinal PAOD in 41 limbs who had preprocedural lipid assessment and underwent successful PTA (<30% residual stenosis). Patient demographics, Fontaine clinical stage classification, Texas University Classification of ulcers, coexisting medical conditions, endovascular procedures, and lipid profiles were collected in a database. Follow-up included clinical and duplex ultrasound evaluation at discharge and at 1, 3, 6, and 12 months. To analyze any correlation between various lipid subfractions and the loss of primary patency (Cox proportional hazards modeling), the patients were dichotomized into high and low groups according to these thresholds: LDL-C >100 mg/dL, HDL-C <40 mg/dL, Lp(a) >30 mg/dL, and an Apo(B)/Apo(A) ratio >0.8 mg/dL.

Results:

Mean follow-up was 7.5 months (range 3-12). After 1, 3, and 6 months, the primary patency rates by Kaplan-Meier analysis were 94.9%, 73.7%, and 64.1%, respectively. Restenosis at 6 months was significantly related to female gender (HR 95.9, 95% CI 6.8 to 1352.5, p=0.001), HDL-C <40 mg/dL (HR 86.9, 95% CI 6.4 to 1183.1, p=0.001), LDL-C >100 mg/dL (HR 9.6, 95% CI 1.6 to 57.4, p=0.013), and Lp(a) >30 mg/dL (HR 6.1, 95% CI 1.4 to 26.3, p=0.016).

Conclusion:

Our results suggest that Lp(a), LDL-C, and HDL-C are independent risk factors for restenosis after infrainguinal PTA.

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