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. 2022 Dec 1;5(12):e2245720.
doi: 10.1001/jamanetworkopen.2022.45720.

Association of Lipoprotein(a) Levels With Incidence of Major Adverse Limb Events

Alexis F Guédon  1 , Jean-Baptiste De Freminville  1 , Tristan Mirault  1   2 , Nassim Mohamedi  1 , Bastien Rance  3 , Natalie Fournier  4   5 , Jean-Louis Paul  4   5 , Emmanuel Messas  1   2 , Guillaume Goudot  1   2
Affiliations

Association of Lipoprotein(a) Levels With Incidence of Major Adverse Limb Events

Alexis F Guédon et al. JAMA Netw Open. .

Abstract

Importance: High lipoprotein(a) (Lp[a]) levels are involved in the development of cardiovascular events, particularly in myocardial infarction, stroke, and peripheral artery disease. Studies assessing the Lp(a) levels associated with adverse lower-limb events are lacking.

Objective: To assess the association between Lp(a) levels and incidence of major adverse limb events in unselected hospitalized patients.

Design, setting, and participants: This large retrospective monocentric cohort study was conducted from January 1, 2000, to December 31, 2020. Data were derived from the clinical information system of the Hôpital Européen Georges-Pompidou, a Paris-based university hospital. Patients who underwent at least 1 Lp(a) measurement at the center during the study period were included. Patients who had no follow-up data or who had the first Lp(a) measurement after the study outcome had occurred were excluded. Data analyses were performed from May 2021 to January 2022.

Main outcomes and measures: The primary outcome was the first inpatient major adverse limb event, defined as a major amputation, peripheral endovascular revascularization, or peripheral surgical revascularization, during follow-up. Secondary outcomes included individual components of the primary outcome. Lipoprotein(a) levels were categorized as follows: normal (<50 mg/dL), high (50 to <134 mg/dL), and very high (≥134 mg/dL); to convert Lp(a) values to milligrams per liter, multiply by 0.1.

Results: A total of 16 513 patients (median [IQR] age, 58.2 [49.0-66.7] years; 9774 men [59.2%]) were included in the cohort. The median (IQR) Lp(a) level was 24 (10.0-60.0) mg/dL. The 1-year incidence of major adverse limb event was 2.44% in the overall population and 4.54% among patients with very high Lp(a) levels. High (adjusted accelerated failure time [AFT] exponential estimate: 0.43; 95% CI, 0.24-0.78; Benjamini-Hochberg-corrected P = .01) and very high (adjusted AFT exponential estimate: 0.17; 95% CI, 0.07-0.40; Benjamini-Hochberg-corrected P < .001) Lp(a) levels were independently associated with an increased risk of major adverse limb event.

Conclusions and relevance: Results of this study showed that higher Lp(a) levels were independently associated with an increased risk of a major adverse limb event in hospitalized patients. The Lp(a) measurement needs to be taken into account to improve lower-limb vascular risk assessment.

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Conflict of interest statement

Conflict of Interest Disclosures: Dr Mirault reported receiving grants from Genzyme and personal fees from Novartis during the conduct of the study; personal fees from Bayer Healthcare and Incyte outside the submitted work; and nonfinancial support from Bayer Healthcare, Merck Sharp & Dohme, Amgen, Bristol-Myers Squibb–Pfizer, and Alexion outside the submitted work. No other disclosures were reported.

Figures

Figure 1.
Figure 1.. Flowchart of Study Population
HEGP indicates Hôpital Européen Georges-Pompidou; Lp(a), lipoprotein(a).
Figure 2.
Figure 2.. Kaplan-Meier Survival Curves of the Cumulative Incidence of Major Adverse Limb Event (MALE) by Lipoprotein(a) (Lp[a]) Level Categories
The inset shows the detail on an enlarged y-axis.
See this image and copyright information in PMC

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