Why the study?
Does an alternate high-fat diet that elevates HDL preserve adenosine-elicited coronary vasodilatation in hypercholesterolemic swine compared to a continuous high-fat diet?
Does an alternate high-fat diet that elevates HDL preserve adenosine-elicited coronary vasodilatation in hypercholesterolemic swine compared to a continuous high-fat diet?
Absolute Event Rate: 1.6% vs 2.6%
p-value: p=<0.001
In a swine model of hypercholesterolemia, elevation of plasma HDL levels via an alternate diet regimen counteracted LDL-related impairment of coronary vasodilation.
No immediate practice change from swine data; hypothesis-generating for HDL-elevating regimens preserving coronary flow in humans.
It is known that high-cholesterol diet impairs coronary vasodilatation in animal models of athe-rosclerosis irrespective of overt pathology. We evaluated the specific role of LDL and HDL on adenosine-elicited coronary vasodilatation after short time (10 weeks) high-cholesterol diet in pigs. Nineteen pigs on standard (C), atherogenic (HF) and alternate standard or atherogenic diet every other week (IHF) underwent left coronary angiography and flow (CFR) measurement during intracoronary adenosine injection. Total cholesterol, HDL, LDL, Apo lipoprotein A-1, IL-6, TNF-α and ICAM-1 were measured and histology of coronary samples was performed. IHF and HF show comparable intimal thickening of lesions, similar cholesterol (598.4 ± 198.2 and 633.2 ± 83.5 mg/dL) and LDL (502.6 ± 193.7 and 576.1 ± 83.2), while HDL is double in IHF group (88.3 ± 6.4 vs 46.4 ± 18.7 p < 0.0001). Vasodilation is reduced in HF (CFR = 1.6 ± 0.2, p < 0.001) as compared to C (2.6 ± 0.4), whilst it is preserved in IHF (2.7 ± 0.4). CFR and HDL values of all hypercholesterolemia cases are positively correlated (r = 0.88, p < 0.001). No relation with cytokines/cell adhesion markers is present. These findings suggest for the first time that elevation of plasma HDL level counteracts LDL related vasodilation impairment during coronary atherogenesis in swine.
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Vozzi et al. (2014) studied Hypercholesterolemia (n=21). Continuous high-fat diet (HF) vs. Standard diet (C) was evaluated on Coronary Flow Reserve (CFR) (p=<0.001).
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