Elsevier

Metabolism

Volume 35, Issue 4, April 1986, Pages 311-316
Metabolism

Plasma triglycerides related decrease in high-density lipoprotein cholesterol and its association with myocardial infarction in heterozygous familial hypercholesterolemia

https://doi.org/10.1016/0026-0495(86)90146-0Get rights and content

Abstract

Recent studies suggest that decreased levels of high-density liopoprotein (HDL) may contribute to the risk of premature occlusive atherosclerosis in familial hypercholesterolemia (FH). To investigate further, we have analyzed the concentration as well as distribution of HDL cholesterol in relation to plasma triglycerides and their influence on ischaemic heart disease in FH subjects. The study was carried out in 71 men with heterozygous FH and 46 matched controls. FH subjects were relatively young with a mean age of 38 ± 11 years. Tendon xanthomatas were observed in 57% of the subjects, whereas ischemic heart disease was identified in 33%. Compared to normals, the mean value of HDL cholesterol is significantly reduced by 21% in FH heterozygotes (42 ± 12 v 33 ± 9 mg/dL, P < 0.001). The decrease in HDL cholesterol is highly correlated to the levels of plasma triglycerides (r = −0.50, P < 0.001) and VLDL cholesterol (r = −0.53, P < 0.001). Moreover, HDL cholesterol decrease is not associated with elevated levels of LDL cholesterol (r = −0.20, NS), which is the primary characteristic feature of FH subjects. However, HDL cholesterol decrease is weakly related to total plasma cholesterol concentration (r = −0.24, P < 0.05). The body weight is also contributory to the reduction of HDL cholesterol (r = −0.42, P < 0.01), probably due to its strong positive correlation to plasma triglycerides (r = +0.54, P < 0.001). Grouping of subjects on the basis of triglyceride levels of less than 200 mg/dL (IIa phenotype) and more than 200 mg/dL (IIb phenotype) shows that the concentration of HDL cholesterol undergoes a further significant decrease in the latter group (36 ± 9 v 30 ± 11 mg/dL, P < 0.001). Since the level of LDL cholesterol is similar in both groups (314 ± 68 v 316 ± 76 mg/dL, NS), a further reduction in HDL cholesterol concentration results in an increased LDL/HDL ratio in IIb phenotypes. Although HDL cholesterol is normally distributed in controls and type IIa phenotypes, its distribution is skewed to lower values in type IIb. In addition to similar levels of LDL cholesterol, the presence of tendon xanthomatas is equally observed in both type IIa and type IIb subjects (51.1% and 62.5%, respectively). Similarly, the incidence of angina pectoris (19.2% and 12.5% in type IIa and type IIb, respectively) is also approximately the same in both groups. However, the differences are striking in the incidence of myocardial infarction (MI), which is increased three-fold (25% v 8.5%) in type IIb subjects, as compared to type IIa. These findings indicate that in addition to LDL excess, HDL deficiency associated with elevated plasma triglycerides contributes to the severity of ischemic heart disease, as revealed from the manifestation of MI in some FH heterozygotes.

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