U.S. guidelines need updating
To foster this, U.S. guidelines, which influence every aspect of care, including testing, prevention, treatment, reimbursement, and medical legal issues, need to be simplified. The discussion of Lp(a) testing in the 2018 U.S. guidelines on cholesterol management is already obsolete. The contingencies on when testing is “reasonable” or “may be reasonable” are dated and cumbersome. In contrast, a recommendation to test everyone once, perhaps in adolescence, would be a useful, forward-looking strategy.
To date, trials of an antisense oligonucleotide and a small interfering RNA molecule targeting hepatic LPA messenger RNA have confirmed that plasma Lp(a) levels can be significantly and safely lowered. If the ongoing Lp(a) HORIZON and OCEAN(a) phase 3 trials have positive outcomes in patients with known ASCVD, this would spawn a host of clinical trials to explore the possibilities of these therapies in primary prevention as well. These will require tens of thousands of enrollees, and universal testing would expand the pool of potential participants.
The majority of at-risk individuals identified through universal testing would be candidates for primary prevention. This large, currently unidentified cohort should have all coexisting risk factors assessed and managed; lowering elevated LDL cholesterol early and aggressively is paramount. Recent data from the United Kingdom suggest that attainment of specific LDL cholesterol levels may offset the risk for vascular events in those with high Lp(a) levels.
Of note, this was the advice given to the small fraction of high-risk individuals like me, who had their Lp(a) level tested long before its ominous implications were understood. This recommendation was informed mostly by common sense. For any number of reasons, the same might be said for universal testing.
Dr. Leahy, a retired cardiologist in San Diego, has an abiding professional and personal interest in Lp(a), which has been responsible for a number of cardiovascular events in his own life over the past 2 decades. He was a participant in the phase 2 clinical trial of the Lp(a)-lowering antisense oligonucleotide being studied in the Lp(a) HORIZON trial, funded by Novartis, and is currently undergoing apheresis treatment. A version of this article originally appeared on Medscape.com.