Small apolipoprotein(a) isoforms may predict primary patency following peripheral arterial revascularization

Area of Science:

• Cardiovascular Medicine
• Genetics
• Vascular Surgery

Background:

• High lipoprotein (a) [Lp(a)] levels are associated with adverse limb events after lower extremity revascularization.
• Lp(a) levels are genetically determined by the *LPA* gene, influencing apolipoprotein (a) [apo(a)] isoform size.
• Isoform size, determined by kringle IV type 2 (KIV-2) repeats, inversely correlates with Lp(a) levels.

Purpose of the Study:

• To investigate the association between Lp(a) levels, apo(a) isoform size, and inflammatory markers with outcomes of lower extremity revascularization.
• To determine if apo(a) isoform size predicts postoperative complications such as lesion occlusion or need for reintervention.

Main Methods:

• Twenty-five patients with peripheral arterial disease (PAD) underwent lower extremity revascularization.
• Preoperative plasma Lp(a), apoB100, lipids, and inflammatory markers were measured.
• Apo(a) isoform size was estimated using gel electrophoresis, calculating weighted isoform size (*wIS*).

Main Results:

• No significant association was found between Lp(a) levels or *wIS* and measured inflammatory markers.
• Smaller apo(a) *wIS* was significantly associated with postoperative lesion occlusion (OR, 1.97; P < .05).
• A trend suggested smaller apo(a) *wIS* might be linked to reintervention (OR, 1.57; P = .07).

Conclusions:

• Smaller apo(a) isoform size in patients undergoing peripheral revascularization may increase the risk of postoperative occlusion and reintervention.
• These preliminary findings highlight the potential role of apo(a) size in vascular outcomes.
• Larger studies are required to validate these results and elucidate underlying mechanisms.