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Lp(a) variability after ACS mainly reclassifies intermediate-risk patients, cohort of 235 (J Clin Med 2026)
Original title: Intra-Individual Variability of Lipoprotein(a) After Acute Coronary Syndrome: A Long-Term Cohort Study
Two-cohort study of 235 acute coronary syndrome (ACS) patients, measuring Lp(a) 24 hours before discharge and at follow-up (Cohort A: 4 and 8 months; Cohort B: 5 years), defining clinically meaningful variability as 20 mg/dL or more, or 25% or more change. 57.9% of patients showed clinically significant Lp(a) variability, with risk-category changes in 15.3% of baseline high-risk, 60.6% of intermediate-risk, and 5.5% of low-risk patients. Incomplete revascularisation independently predicted high variability (OR 2.22, 95% CI 1.14-4.31, p=0.02); female sex and age-adjusted menopause showed non-significant trends (OR 1.92, p=0.08; OR 11.18, p=0.07). Median absolute change was 7.9 mg/dL (IQR 3.0-18.9) at 4 months and 10.7 mg/dL (IQR 3.0-21.7) at 5 years, with excellent concordance between 4- and 8-month measurements. The authors conclude early post-ACS Lp(a) variability mainly reclassifies intermediate-risk patients, for whom early repeat testing may help, while longer-term reassessment appears unnecessary.
Original abstract
Background: Lipoprotein(a) [Lp(a)] is a causal and independent risk factor for atherosclerotic cardiovascular disease (ASCVD) and is largely genetically determined. However, recent studies indicate significant intra-individual variability, particularly among patients with intermediate Lp(a) levels (30-50 mg/dL). Yet, data on long-term variability are limited, and acute coronary syndrome (ACS) may further influence Lp(a) levels, raising questions regarding the optimal timing of assessment after ACS. Methods: We studied 235 ACS patients across two follow-up cohorts. Baseline Lp(a) was measured 24 h before hospital discharge. Cohort A had follow-up measurements at 4 months and 8 months; Cohort B had them at 5 years. Clinically meaningful intra-individual variability was defined as ≥20 mg/dL or ≥25% change. Results: 57.9% of patients exhibited clinically significant Lp(a) variability. Changes in risk category occurred in 15.3% of patients in the baseline high-risk group, 60.6% of patients in the intermediate-risk group, and 5.5% of patients in the baseline low-risk group. In the multivariable analysis, incomplete revascularization was an independent predictor of high Lp(a) variability (odds ratio (OR) 2.22; 95% confidence interval (CI) 1.14-4.31; p = 0.02) while female sex and age-adjusted menopause showed a trend (OR 1.92; 95% CI 0.93-4.00; p = 0.08 and OR 11.18; 95% CI 0.79-157.58; p = 0.07, respectively) without reaching statistical significance. The median absolute changes from baseline to 4-month and from baseline to 5-year follow-up were 7.9 mg/dL (interquartile range (IQR) 3.0-18.9) and 10.7 mg/dL (IQR 3.0-21.7), respectively. Concordance between 4- and 8-month Lp(a) measurements was excellent. Conclusions: Early post-ACS intra-individual variability in Lp(a) is common, mainly affecting risk reclassification in intermediate-risk patients. In those patients, early, targeted, repeat Lp(a) measurement may improve cardiovascular risk stratification, whereas mid- to long-term reassessment appears unnecessary.
Summary written by lp-a.org from the published abstract; figures as published. Page updated 17 August 2026. Methods.