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Published on: August 28, 2018
Lipoprotein(a) and Coronary Calcification: Prognostic Implications in Rotational Atherectomy Patients
Yaolin Chen1,2,3, Wei Gao2,3,4, Yinman Wang1,2,3,4
1Department of Cardiology, Zhongshan Hospital, Fudan University (Xiamen Branch), Xiamen, China.
Insights
Elevated Lipoprotein(a) [Lp(a)] levels (≥50 mg/dL) are linked to major adverse cardiac events (MACE) in patients undergoing rotational atherectomy. Markedly elevated Lp(a) (≥68.3 mg/dL) also predicts cardiovascular death, particularly in smokers and those with comorbidities.
Area of Science:
- Cardiology
- Vascular Biology
- Interventional Cardiology
Background:
- Elevated Lipoprotein(a) [Lp(a)] is a known risk factor for major adverse cardiac events (MACE).
- The prognostic role of Lp(a) in patients with severe coronary calcifications undergoing rotational atherectomy (RA) is not well-defined.
- This study investigates the association between Lp(a) levels and clinical outcomes post-RA in this specific patient cohort.
Purpose of the Study:
- To determine the prognostic value of Lipoprotein(a) [Lp(a)] in patients with severe coronary calcifications after rotational atherectomy (RA).
- To assess the relationship between Lp(a) levels and the risk of major adverse cardiac events (MACE) and cardiovascular death (CVD).
Main Methods:
- Retrospective analysis of data from 494 patients who underwent RA.
- Stratification of Lp(a) levels into <50 mg/dL and ≥50 mg/dL categories.
- Evaluation of MACE and CVD as primary outcomes, with survival analysis and Cox regression.
Main Results:
- Patients with Lp(a) ≥50 mg/dL showed a significantly higher incidence of MACE (log-rank p=0.006).
- An optimal threshold of 68.3 mg/dL for CVD was identified, with Lp(a) ≥68.3 mg/dL associated with increased CVD risk (log-rank p=0.02).
- Lp(a) was an independent risk factor for MACE, especially in smokers and patients with comorbidities.
Conclusions:
- Lp(a) ≥50 mg/dL is independently associated with MACE in patients with severe coronary calcification undergoing RA.
- Markedly elevated Lp(a) levels (≥68.3 mg/dL) are associated with cardiovascular death.
- Lp(a) identifies a higher MACE risk subgroup, including smokers and those with comorbidities.
Background:
Elevated Lipoprotein(a)[Lp(a)] concentrations have long been associated with an increased risk of major adverse cardiac events (MACE). However, the relationship of Lp(a) and clinical outcomes in patients with severe coronary calcifications undergoing rotational atherectomy (RA) remains unclear. This study aimed to explore the prognostic implications of Lp(a) in patients with calcified coronary lesions after RA.
Methods:
Data from 494 consecutive patients undergoing RA were retrospectively collected. Lp(a) levels were stratified into two categories: < 50 mg/dL, and ≥ 50 mg/dL. Outcomes included MACE, and cardiovascular death (CVD).
Results:
Kaplan-Meier analysis demonstrated a significantly higher incidence of MACE in patients with Lp(a) ≥ 50 mg/dL (log-rank p = 0.006), but no significant difference was observed in the incidence of CVD (log-rank p = 0.062). We applied the minimum p-value method and identified an optimal threshold of 68.3 mg/dL for CVD, then further validated by survival analysis (log-rank p = 0.02). Multivariate Cox regression analysis showed Lp(a) remained an independent risk factor for MACE after adjusting for confounders. Age, hemodialysis, complications and heart failure were common risk factors for both MACE and CVD. Subgroup analysis indicated that Lp(a) predicted higher MACE risk in smokers and patients with comorbidities.
Conclusion:
In patients with severe calcification undergoing RA, Lp(a) ≥ 50 ml/dL was independently associated with MACE but not with CVD, except when Lp(a) was markedly elevated (≥ 68.3 mg/dL). Additionally, Lp(a) was found to predict a higher risk of MACE in smokers and patients with comorbidities.
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