Genetic influence on femoral plaque and its relationship with carotid plaque: an international twin study

Cardiovascular Risk Assessment in Women With Rheumatoid Arthritis Through Carotid and Femoral Artery Doppler Ultrasound

OBJECTIVE

The aims of this study were to assess cardiovascular risk in patients with rheumatoid arthritis (RA) classified as low-risk by the Framingham score, before and after the multiplication by 1.5 recommended by the European League Against Rheumatism (EULAR), and to stratify them using carotid and femoral Doppler ultrasound (DUS) in order to optimize the assessment of the asymptomatic cardiovascular disease incidence.

METHODS

Thirty-five female patients with RA and 35 healthy women (control group), both with low cardiovascular risk by Framingham score, were enrolled in the study (randomized). All of them underwent carotid and femoral DUS studies.

RESULTS

The mean age at diagnosis was 44.57 years, the mean disease duration was 12.11 years and the mean disease activity score according to the Disease Activity Score 28 was 1.91, whereas according to the Clinical Disease Activity Index, it was 6.176. The sample was homogeneous. Within the RA group, 46% showed changes in the carotid and/or femoral DUS, compared with 14% in the control group (p = 0.004). Of the DUS with abnormalities, in the RA group, 31% of the carotid DUS and 81% of the femoral DUS (p = 0.005) showed intima-media thickness and/or atherosclerotic plaques. After EULAR 1.5 multiplication factor, 66% remained low cardiovascular risk. Of these, 35% of the patients showed changes in the carotid and/or femoral DUS, compared with 14% of the control group (p = 0.07).

CONCLUSIONS

The EULAR criteria are effective at identifying patients with high cardiovascular risk. Carotid DUS and, especially, femoral DUS are tools that can be used in clinical practice as ways to detect CVD even in its asymptomatic form.

Overlapping Genetic Background of Coronary Artery and Carotid/Femoral Atherosclerotic Calcification

Background and objectives: Multivessel atherosclerosis and its genetic background are under-investigated, although atherosclerosis is seldom local and still causes high mortality. Alternative methods to assess coronary calcification (CAC) might incorporate genetic links between different arteries’ atherosclerotic involvement, however, co-occurrences of coronary calcification have not been investigated in twins yet. Materials and Methods: We assessed the heritability of radio morphologically distinct atherosclerotic plaque types in coronary (non-enhanced CT, Agatston score), carotid, and femoral arteries (B-mode ultrasound) in 190 twin subjects (60 monozygotic, 35 dizygotic pairs). Four-segment scores were derived in order to assess the dissemination of the distinct plaque types in the carotid and femoral arteries taking bilaterality into account. We calculated the genetic correlation between phenotypically correlating plaque types in these arteries. Results: CAC and dissemination of calcified plaques in the carotid and femoral arteries (4S_hyper) were moderately heritable (0.67 [95% CI: 0.37–1] and 0.69 [95% CI: 0.38–1], respectively) when adjusted for age and sex. Hypoechoic plaques in the carotid and femoral arteries showed no heritability, while mixed plaques showed intermediate heritability (0.50 [95% CI: 0–0.76]). Age and sex-adjusted phenotypic correlation between CAC and 4segm_hyper was 0.48 [95% CI: 0.30–0.63] and the underlying genetic correlation was 0.86 [95% CI: 0.42–1]. Conclusions: Calcification of atherosclerotic plaques is moderately heritable in all investigated arteries and significant overlapping genetic factors can be attributed to the phenotypical resemblance of coronary and carotid or femoral atherosclerotic calcification. Our findings support the idea of screening extracoronary arteries in asymptomatic individuals. We also propose a hypothesis about primarily carotid-coronary and femoral-coronary atherosclerosis as two distinct genetic predispositions to co-localization.

Carotid Artery Atherosclerosis: A Review on Heritability and Genetics

Carotid atherosclerosis (CAS) is associated with increased cardiovascular risk, and therefore, assessing the genetic versus environmental background of CAS traits is of key importance. Carotid intima-media-thickness and plaque characteristics seem to be moderately heritable, with remarkable differences in both heritability and presence or severity of these traits among ethnicities. Although the considerable role of additive genetic effects is obvious, based on the results so far, there is an important emphasis on non-shared environmental factors as well. We aimed to collect and summarize the papers that investigate twin and family studies assessing the phenotypic variance attributable to genetic associations with CAS. Genes in relation to CAS markers were overviewed with a focus on genetic association studies and genome-wide association studies. Although the role of certain genes is confirmed by studies conducted on large populations and meta-analyses, many of them show conflicting results. A great focus should be on future studies elucidating the exact pathomechanism of these genes in CAS in order to imply them as novel therapeutic targets.