Correlation of parents' longevity with carotid intima-media thickness in patients attending a Lipid Clinic

The relationship between carotid intima-media thickness (IMT) and the subject's parents' longevity has been investigated. The association between parents' age at death and IMT was estimated in 593 consecutive patients attending a Lipid Clinic by survival-analysis methods. Average maximum IMT (Avg-IMT), maximum IMT (Max-IMT), clinical and laboratory variables and parental age at death, were assessed. Kaplan-Meier analyses showed significant differences in survival curves, low IMTs being associated with long-lived parents (p=0.0003 and 0.001 by log-rank test for fathers and mothers, respectively). A Cox proportional hazards regression model showed that higher carotid IMT values were associated with father's and mother's deaths at an early age, even after adjusting for conventional cardiovascular risk factors. These data were confirmed after the stratification of patients into younger (<65 y) and older (>/=65 y) or into subjects with and without a family history of dyslipidemia or vascular diseases. In addition, by stratifying subjects into those with no, one or two long-lived parents, we observed a significant trend for the combination of father's and mother's longevity on their offspring's IMTs (p<0.01 and 0.05 for Avg-IMT and Max-IMT, respectively). These data highlight a significant relationship between carotid artery IMT and a familial predisposition to be long-lived that is independent of the individual's vascular risk profile.