[Study of lipid metabolic coefficient K2 in patients with hyperlipoproteinemia type IV before and after reduction of triglyceride level by adapted diet therapy].

An intravenous fat tolerance test (IV FTT) was performed in a group of patients with type IV hyperlipoproteinemia before and after reduction of triglyceride level, the latter is obtained through a diet adapted to the nutritional sensitivity, body weight remaining constant. Before the diet the increase in cholesterol (CT) and triglycerides (TG) was related in both obese and non-obese patients to an increase in very-low-density lipoproteins (VLDL), while other lipoprotein fractions were not affected. In these patients, K2 is significantly lower than in controls whatever the nutritional sensitivity. However, K2 is lower in obese patients than in patients with normal weight, VLDL-CT and VLDL-TG are tremendously reduced by the relevant diet and K2 is constantly and significantly increased, although it does not reach a normal value in obese subjects. There is a highly significant correlation between VLDL-TG levels and K2 in obese and non-obese subjects. Several physiopathological explanations are discussed to account for the variation of K2 according to TG levels. The results obtained support the view that the K2 defect is secondary to the hyperlipoproteinemia.