Association of Achilles tendon thickness with lipid profile and carotid IMT in patients with familial hypercholesterolemia.

BACKGROUND AND AIMS: Familial hypercholesterolemia (FH) is characterized by high levels of low-density lipoprotein cholesterol (LDL-C) and Achilles tendon (AT) thickening. AT thickness (ATT) is useful for diagnosing FH and assessing the risk of coronary artery disease (CAD). Nevertheless, the relationship between AT thickening and lipid profile is not clear. We investigated the association of ATT with lipid Profile and carotid IMT.

METHODS

We included 450 patients with clinically diagnosed heterozygous FH. ATT was measured by ultrasonography.

RESULTS

The rate of thickening increased for both AT and carotid-IMT according to age (p < 0.001). In the teens, there was no carotid-IMT thickening, but 39 % of the subjects had a thickened AT. The thresholds of cumulative LDL-C values for AT and carotid-IMT thickening based on ROC curves were 9210 mg/dL∗years (AUC: 0.66, 95 % CI: 0.61-0.72) for ATT and 11,255 mg/dL∗years (AUC: 0.79, 95 % CI: 0.75-0.84) for carotid-IMT. For cumulative LDL-C levels ≥ median, untreated HDL-C level was lower in the AT thickened group than in the non-thickened group (AT thickened: 52 (43-63) mg/dL, non-thickened: 63 (52-72) mg/dL). There was a significant correlation between ATT and cumulative LDL-C (Male: R = 0.48 p < 0.001, Female: R = 0.33 p < 0.001).

CONCLUSIONS

We clarified that both cumulative exposure to LDL-C and untreated HDL-C levels were closely related to AT thickening. Our results show that in ultrasonographic assessment, ATT is more useful than carotid-IMT for predicting the degree of lipid deposition in tissues, especially in young adults.