In heart failure, derangements in HDL cholesterol particle (HDL-P) subfractions have prognostic implications beyond those of conventional cardiovascular risk factors, according to investigators who analyzed plasma samples from more than 6,500 patients.
Dr. Wynn G. Hunter
The study revealed derangements that were shared and more severe in heart failure with reduced ejection fraction (HFrEF) as compared to heart failure with preserved ejection fraction (HFpEF), according to the researchers, who said their study is the largest to date of HDL-P subfractions in heart failure.
Both total HDL-P and small HDL-P had a strong inverse association with adverse outcomes, consistent with the conclusions of previous studies, they said in a report on their study in the Journal of the American College of Cardiology.
“Altogether, our findings support total and small HDL-P as important markers of residual risk in both HFrEF and HFpEF,” said the investigators, led by Wynn G. Hunter, MD, of Duke University, Durham, N.C.
Dr. Hunter and colleagues used the CATHGEN (Catheterization Genetics) biorepository to identify plasma samples obtained at catheterization for 782 patients with HFrEF, 1,004 with HFpEF, and 4,742 with no heart failure.
Lipoprotein profiling of the samples revealed that mean HDL-P size was greater in HFrEF than in HFpEF, and in both of those cases, mean HDL-P size was greater than in patients with no heart failure (P less than .0001), investigators reported.
Concentrations of small HDL-P and total HDL-P were by contrast lower in HFrEF versus HFpEF, and again, the values for both HFrEF and HFpEF were lower than in patients without heart failure (P less than .0001), they added.
Small HDL-P and total HDL-P had an inverse association with time to adverse events and all-cause mortality for both the HFrEF and HFpEF groups, according to investigators, who said those links remained robust even after multivariate adjustment for 14 cardiovascular risk factors, including diabetes, LDL particle, and GlycA, a marker of inflammation.
For example, small HDL-P and total HDL-P were inversely associated with all-cause mortality risk, with adjusted hazard ratios of 0.69-0.79 (P less than .0001), they reported. Similarly, a greater mean HDL-P size was associated with increased risk of all-cause mortality, yielding adjusted hazard ratios of 1.23-1.46 (P less than .0001).
Further studies are needed to clarify the role of HDL-P in the pathophysiology of heart failure, and to identify treatments that might increase total and small HDL-P in heart failure patients, Dr. Hunter and coauthors concluded.
Dr. Hunter reported no disclosures related to the study. Coauthors provided disclosures related to Amgen, Ostuka, Roche Diagnostics, Novartis, Trevena, Singulex, Medtronic, AstraZeneca, Bristol-Myers Squibb, Janssen, Portola, Boston Scientific, Gilead, GlaxoSmithKline, Merck, Alnylam, Ikaria Pharmaceuticals, Pfizer, Philips, LipoScience, and Pfizer, among others.
SOURCE: Hunter WG et al. J Am Coll Cardiol. 2019 Jan 22;73(2):177-86.