Low muscle mass is linked with presence of non-alcoholic fatty liver disease irrespective to central obesity: highlights from a prospective epidemiological study in Greece

Background/Introduction

The association between sarcopenia and nonalcoholic fatty liver (NAFL) is highlighted in recent epidemiological studies, although results remain inconsistent.

Purpose

This study aimed to examine the association of low skeletal muscle mass with NAFL as well as the potential mediating effect of waist circumference on the examined association.

Methods

At baseline, 3,042 participants from the Attica region of Greece were recruited. NAFL was assessed through hepatic steatosis index (HSI). Skeletal muscle mass index (SMI) was indirectly calculated using a standard validated procedure.

Results

Ranking from 1st to 3rd SMI tertiles NAFL rate was 45%, 33% and 22%, respectively (p<0.001). Multi-adjusted logistic regression analysis revealed that participants assigned in the 2nd (Odds Ratio (OR): 0.50, 95% Confidence Interval (95% CI): 0.41–0.61)) and 3rd SMI tertile had 50% and 76% (OR: 0.24, 95% CI: 0.19–0.29) lower likelihood to have NAFL compared with their 1st tertile counterparts. This association remained robust after multiple adjustments; however, significance was marginally lost, when waist circumference was added to the model. Subsequently, a multi-adjusted dose-response analysis between SMI and NAFL was performed in the total sample, as well as in the subcategories of normal and abnormal waist circumference. In the total sample, a significant inverse association between SMI and NAFL was observed [OR (per 2 points increase in SMI) = 0.94 (95% CI: 0.92–0.95); p=0.001]. When categorized by waist circumference, participants with moderate/high SMI and normal waist circumference had the lowest NAFL rates (24.3%). Those with low SMI and normal waist circumference and those with moderate/high SMI and abnormal waist circumference had similar rates of NAFL (47.4% and 50.3%, respectively; p=0.25). Participants with both low SMI and abnormal waist circumference presented the highest NAFL rate (60.5%), which was significantly higher compared with the rest subgroups (p<0.001). These findings were confirmed in multi-adjusted analysis to assess NAFL odds per case: participants with adnormal waist, [OR (per 2 points increase in SMI) = 0.97 (95% CI: 0.94–1.00)] vs. participants with normal waist [OR (per 2 points increase in SMI) = 0.89 (95% CI: 0.84–0.95)].

Conclusions

Increasing SMI was associated with lower rates of NAFL independently to abdominal obesity, whereas the two interact as key determinants of NAFL.

Funding Acknowledgement

Type of funding sources: Other. Main funding source(s): Hellenic Society of Cardiology

Ultra-processed foods and ten-year cardiovascular disease incidence in a Mediterranean population: results from a population-based cohort study

Background/Introduction

Although cardiovascular disease (CVD) guidelines emphasize consuming minimally processed foods, such as fruits, vegetables, whole grain products, nuts and seeds, less attention has been given to the importance of minimizing ultra-processed foods, probably due to the paucity of studies that exist.

Purpose

The aim of the present work was to investigate the association between the consumption of ultra-processed foods and ten-year first fatal/non fatal CVD event in a sample from Greece.

Methods

A prospective study was conducted during 2001–2012 studying n=1,514 men and n=1,528 women (>18 years old) free of CVD. Baseline dietary assessment was based on a validated semi-quantitative food frequency questionnaire. Ultra-processed foods were defined according to a standardized procedure and included among others sweets and desserts, beverages, salty snacks, breakfast cereals and fast foods. Follow-up assessment of first fatal/non fatal CVD event (2011–2012) was achieved in n=2,020 participants (n=317 cases). Cox proportional hazards models were constructed to determine the multiadjusted association between ultra-processed food intake (energy-adjusted servings per week) and incident fatal/non fatal CVD.

Results

On average, participants consumed about 15 servings of ultra-processed foods per week. Ranking from 1st to 3rd ultra-processed food consumption tertile (low to high level of intake) CVD incidence was 8.1%, 12.2%, 16.6% (p=0.006). Each additional weekly serving of ultra-processed food was associated with 10% higher CVD risk within the decade (Hazard Ratio (HR)=1.10, 95% Confidence Interval (95% CI) (1.02, 1.21), p=0.04). This association was reexamined according to participants' level of adherence to a cardiac friendly dietary pattern i.e. Mediterranean diet (defined through MedDietScore, range 1–55). In particular, the aggravating effect of ultra-processed foods was retained and only slightly attenuated even in the subset of participants with moderate to high level of adherence to Mediterranean diet (defined as MedDietScore>27) (HRper 1 serving/week=1.08, 95% CI (0.98, 1.19), p=0.09). On the other side, it became even stronger in case of low level of adherence to this pattern (HRper 1 serving/week=1.19, 95% CI (1.12, 1.25), p=0.02).

Conclusions

Current findings support that even in a population with Mediterranean origins and easy access to healthy least processed choices, systematic consumption of ultra-processed foods on a weekly basis was associated with increased risk of hard CVD events. Tailor-made public health initiatives and nutrition policies are demanded to promote healthy and sustainable dietary patterns with less-processed foods of high nutritional value.

Funding Acknowledgement

Type of funding sources: None.

The quality of plant-based dietary patterns affects the ten-year cardiovascular disease risk of participants with non-alcoholic fatty liver disease: highlights from a population-based cohort study

Background/Introduction

Some plant-based diets like the Mediterranean diet have been suggested to have a beneficial impact on liver disease. However, the quality of plant-based diets – in general – varies.

Purpose

The association between plant-based diet indices and non-alcoholic fatty liver disease (NAFLD) as well as their interaction on ten-year cardiovascular disease incidence was examined.

Methods

A prospective study was conducted during 2001–2012 studying n=1,514 males and n=1,528 females (aged >18 years old) free of CVD. Healthy metabolic status was defines as absence of all NCEP ATP III (2005) metabolic syndrome components (excluding waist circumference). Follow-up CVD assessment (2011–2012) was achieved in n=2,020 participants (n=317 cases). Overall, healthful and unhealthful plant-based dietary indices (PDI, hPDI and uPDI) were created through a standard procedure; hPDI was principally characterized by increased consumption of fruits/vegetables, whole grains, nuts, legumes, oils, tea/coffee while uPDI was related with increased intake of juices, sweetened beverages, refined grains, potatoes and sweets. NAFLD was defined according to validated liver steatosis indices.

Results

In total, n=707 (35%) participants presented NAFLD at baseline. Ranking from 1st to 3rd PDI tertile, NAFLD prevalence was 40.3%, 35.6% and 30.9%, respectively (p=0.04). Multiadjusted analysis revealed significant inverse associations between PDI and NAFLD prevalence [Odds Ratio (OR) (3rd vs. 1st tertile)=0.60 95% Confidence Interval (95% CI) (0.35, 0.92)] as well as hPDI [OR (3rd vs. 1st tertile) = 0.75 95% CI (0.64, 0.89)]. On the other side, increased uPDI had a positive association with NAFLD prevalence [OR (3rd vs. 1st hPDI tertile) = 1.22 95% CI (1.05, 1.34)]. NAFLD predicted CVD in multi-adjusted model [Hazard Ratio (HR) = 1.35, 95% CI (1.08, 2.10)]. Subgroup analyses according to participants' adherence to overall, healthy and unhealthy plant-based patterns revealed that this observation remained significant in the following cases: participants in the 1st PDI tertile, [HR=1.40, 95% CI (1.15, 2.09)] and participants in the 1st hPDI tertile [HR=1.47, 95% CI (1.22, 2.12)].

Conclusions

Lower adherence to plant-based diet was associated with substantially higher long-term CVD risk for a NAFLD individual. Most importantly, the healthy or unhealthy food choices within this pattern seemed to determine liver steatosis progression and in turn cardiometabolic health.

Funding Acknowledgement

Type of funding sources: None.

A-posteriori protein-rich dietary patterns and their association with ten-year transition to metabolically unhealthy status: highlights from a population-based cohort study

Background/Introduction

The role of dietary protein on cardiometabolic health remains complex influenced by concomitant changes in overall diet composition. The quality of protein sources is currently suggested as more detrimental than the level of consumption itself.

Purpose

The association between different protein-rich dietary patterns and 10-year transition to metabolically unhealthy status in a sample from Greece was evaluated.

Methods

A prospective study was conducted during 2001–2012 studying n=1,514 men and n=1,528 women (>18 years old) free of CVD. Healthy metabolic status was defined as absence of all NCEP ATP III (2005) metabolic syndrome components. Baseline dietary assessment was based on a validated semi-quantitative food frequency questionnaire. Dietary protein was calculated through standardized food database. Follow-up cardiometabolic assessment (2011–2012) was achieved in n=2,020 participants. Protein-rich dietary patterns were derived through factor analysis in the subsample of participants with high daily protein intake (>15% of total energy intake corresponding to the median consumption level). Patterns were named according to food scores that correlated most with the factor (scores>0.5).

Results

Overall, six of ten participants lost their metabolically healthy status within a decade. Multiadjusted analysis revealed an inverse yet non-significant association between total energy-standardized protein intake and transition to metabolically unhealthy status [Odds ratio (OR) (high vs. low protein intake)=0.59, 95% Confidence Interval (95% CI) (0.32, 1.10), p=0.09]. Factor analysis extracted three protein-rich dietary patterns, explained 55% of the total variation in intake. Factor A was characterized by increased consumption of processed meet, unprocessed red meat and eggs, factor B was characterized by increased consumption of nuts and seeds, legumes, whole grain products and fish while factor C was characterized by increased consumption of dairy products, poultry and vegetables. Multiadjusted logistic regression analysis revealed that factor B had the strongest protective effect against 10-year transition to metabolically unhealthy status [ORper 1 point increase in factor B score=0.74, 95% CI (0.60, 0.85), p=0.01] followed by a marginally protective effect of factor C [ORper 1 point increase in factor C score=0.89, 95% CI (0.73, 1.05), p=0.07]. Participants with higher adherence to factor A had an increased likelihood to lose their metabolically healthy status [ORper 1 point increase in factor A score=1.15, 95% CI (1.02, 1.30), p=0.04].

Conclusions

The present work confirms that within an increased level of dietary protein intake, different cardiometabolic outcomes were observed according to the quality of protein food sources consumed.

Funding Acknowledgement

Type of funding sources: None.

Liver steatosis, metabolically healthy obesity and ten-year cardiovascular disease risk: results from a population based cohort study

Background/Introduction

Inclusion of non-alcoholic fatty liver disease (NAFLD) as a component of metabolic syndrome (MetS) and/or a criterion for defining metabolically healthy vs. unhealthy obese (MHO vs MUO) status remains to be decided.

Purpose

The present work evaluated the role of NAFLD at baseline in the transition of MHO to MUO status, and its role in predicting cardiovascular disease (CVD) incidence ten years later.

Methods

A prospective longitudinal study was performed between 2001 and 2012 studying 1,514 (49·8%) men and 1,528 (50.2%) women (>18 years old) free of CVD at baseline and residing in the greater Athens area, Greece. Follow-up assessment of first fatal/non fatal CVD event (2011–2012) was achieved in n=2,020 participants (n=317 cases). Healthy metabolic status was defined as absence of all NCEP ATP III (2005) metabolic syndrome components. NAFLD was defined according to validated liver steatosis indices.

Results

Among obese participants, MHO prevalence was 9.8% (n=277). Only half of the MHO subjects retained their metabolically healthy status one decade later. NAFLD was an important predictor of this transition; MHO participants with NAFLD at baseline had about two times higher odds to develop unhealthy metabolic status compared with their non-NAFLD counterparts. Subsequently, MHO status accompanied by NAFLD was associated with increased CVD risk (Hazard Ratio=2.90 95%Confidence Interval (1.35, 5.40)) in contrast to their non-NAFLD MHO counterparts. C-statistics revealed that NAFLD significantly increased the discriminative ability of the standardly defined metabolic status (p for C-index change=0.002), yet in the total sample its contribution to the model seemed to be similar with the common metric of central obesity i.e. waist circumference (CNAFLD=0.711 vs. Cwc=0.710). When the analysis was restricted to the obese subset, it was revealed that the discriminative ability of the model adjusted for NAFLD was significantly higher compared with the one adjusted for waist circumference (CNAFLD=0.719 vs. Cwc=0.702).

Conclusions

Taking under consideration NAFLD – via validated indices – in the clinical assessment of an apparently healthy obese individual contributes to better defining future risk of conversion to metabolically unhealthy obesity and future cardiometabolic risk.

Funding Acknowledgement

Type of funding sources: None.

A diet-related microsimulation modelling approach in the context of cardiovascular disease prevention: the ATTICA and GREECS epidemiological studies

Funding Acknowledgements

Type of funding sources: Other. Main funding source(s): The ATTICA study is supported by research grants from the Hellenic Cardiology Society [HCS2002] and the Hellenic Atherosclerosis Society [HAS2003].

Background/Introduction: Among all behaviors, nutrition makes the largest contribution to cardiovascular disease (CVD) morbidity across Europe. Purpose: The aim of the present work was to quantify the changes in 10-year CVD onset or recurrence or mortality, in relation to transitioning from low to higher level of adherence to Mediterranean diet. Methods: An individual-level microsimulation was created based on ATTICA (2002-2012, n = 3042 subjects free-of-CVD) and GREECS (2004-2014, n = 2172 patients with acute coronary syndrome (ACS)) studies (in total n = 5214). Eight scenarios regarding the proportion of participants and the size of improvement of level of adherence to Mediterranean diet were compared in terms of relative change in CVD incidence and mortality, as well as, the number of preventable CVD events and deaths. Results: Improving the level of adherence to the Mediterranean diet, even in 10% of the population, a significant relative percentage reduction was observed in the 10-year risk for CVD onset, recurrence and mortality, with the observed reductions being higher among women. In particular, at least 851 first CVD events, 374 recurrent CVD events and 205 CVD deaths per 100,000 of population could be averted or delayed. Additionally, Mediterranean diet clustering revealed that high consumption of fruits, vegetables, whole wheat products and legumes was more important than low consumption of meat and full fat dairy products against CVD. Conclusion: This microsimulation process confirms the added value of Mediterranean diet in primary and secondary CVD prevention having great achievements even with small modifications on a population basis, while challenges the orientation of a Mediterranean-diet intervention giving higher weights to plant-based part.

Application of non-HDL cholesterol for cardiovascular risk prediction in apparently healthy men and women: Results from the ATTICA prospective epidemiological study

Funding Acknowledgements

Type of funding sources: Other. Main funding source(s): The ATTICA study is supported by research grants from the Hellenic Cardiology Society [HCS2002] and the Hellenic Atherosclerosis Society [HAS2003].

Background/Introduction: Consistent evidence exists for a causal association between blood cholesterol and cardiovascular disease (CVD) yet alternative lipid markers are still discussed. To this issue, non-High Density Lipoprotein (non-HDL) cholesterol offers a simple way to analyze the total amount of pro-atherogenic lipoproteins containing apolipoprotein B100. Purpose: The aim of the present work was to evaluate the 10-year first fatal/non fatal CVD incidence related to non-HDL cholesterol on the basis of existing thresholds suggested by the European Society of Cardiology (ESC) in a sample with prevalent CVD. Methods: ATTICA study was conducted during 2001-2012 including n = 1,514 men and n = 1,528 women (aged >18 years old) from the greater Athens area, Greece. Baseline serum blood lipids profile was measured. Non-HDL cholesterol was evaluated according to the formula "total cholesterol minus HDL cholesterol" and the following categories were used: <100 mg/dL; 100 to <145 mg/dL; 145 to <185 mg/dL; 185 to <220 mg/dL, and ≥220 mg/dL. Ten-year follow up was performed (2011-12) in 2,020 participants (n = 317 cases, man-to-woman CVD incidence ratio = 1.66). Results: About 42% of women had non-HDL values within the range of 100 to <145 mg/dL while in case of men about one third of them had non-HDL values within the range of 100 to 185mg/dL. Ranking from low to high non-HDL cholesterol CVD incidence was 5.3%, 13.3%, 18.0%, 20.0% and 28.9%. The man-to-woman age-standardized CVD incidence ratio was 1.50, 1.93, 1.37, 1.24, 1.64, respectively; indicating a steep rise in CVD incidence rate in favor of men when non-HDL cholesterol levels reached the 2nd category levels (i.e. 100 to <145 mg/dL) while women seemed to present CVD incidence rates closer to their men counterparts in case of higher non-HDL cholesterol values (i.e. 145 to <220 mg/dL). Multi-adjusted Cox regression analysis revealed that 30mg/dL increase in non-HDL cholesterol values corresponded to 34% higher risk to develop CVD within the decade (Hazard ratio (HR)=1.34, 95% Confidence Interval (95%CI) (1.00, 1.81)). The association remained significant only in case of men (p for gender interaction = 0.01); HR = 1.45, 95%CI (1.09, 1.95). Additionally, when the categorical non-HDL variable was used, its independent aggravating effect on CVD outcome reached the level of significance only for non-HDL cholesterol values >220mg/dL; HR5th vs. 1st category = 1.95, 95%CI (1.10, 4.30). Sex-based stratified analysis revealed significance only in men and particularly HR5th vs. 1st category = 3.14, 95%CI (1.26, 5.10). In case of women the aggravating effect was retained yet without reaching the level of significance. Conclusion: Even if non-HDL cholesterol concentrations in blood are strongly associated with long-term risk of atherosclerotic CVD, its use in daily clinical practice is challenged. These outcomes could be useful for physician–patient communication about primary prevention strategies.

Arterial aging mediates the effect of TNF-α and ACE polymorphisms on mental health in elderly individuals: insights from IKARIA study

BACKGROUND

Aging is characterized by an insidious decline in cognitive function. Several genetic and lifestyle factors have been implicated in the increased risk or early onset of dementia.

AIM

We sought to assess the role of tumor necrosis factor (TNF) and angiotensin-converting enzyme (ACE) polymorphisms on the development of impaired mental health in respect to indices of arterial aging in nonagenarian individuals.

DESIGN

178 consecutive subjects above 75 years that permanently inhabit in the island of IKARIA, Greece were recruited.

METHODS

Aortic distensibility (AoD) was calculated and genetic evaluation was performed on the ACE Insertion/Deletion gene polymorphism (intron 16) and the G/A transition (position -308) of the TNF gene. Cognitive function was evaluated using the Mini-mental State Examination (MMSE).

RESULTS

The DD genotype for ACE was independently associated ( b  = -0.44, P = 0.007) with AD while AoD remained an independent determinant of mental status (OR = 1.82, P = 0.036). Interestingly though, when a combined genetic index (GI) was calculated for both genes (ACE and TNF), subjects being double homozygous (DD for ACE and GG for TNF) for these loci presented significantly decreased MMSE (adjusted OR = 0.259, P = 0.033). This GI independently associated with AD (beta coefficient = -0.785, P = 0.002). When AoD was included, GI lost its predictive role (OR = 0.784, P = 0.783) towards MMSE. AoD has marginal indirect mediating effect in the association of the GI with MMSE ( P = 0.07).

CONCLUSION

Vascular aging may modulates the genetic substrate of elderly subjects on the risk for developing dementia.

Dietary antioxidant capacity is inversely associated with diabetes biomarkers: the ATTICA study

BACKGROUND AND AIMS

Elevated dietary antioxidant activity has been regarded as providing potential benefits to health. The present work aimed at evaluating the association of glycemic indices with total dietary antioxidant capacity in healthy adults.

METHODS AND RESULTS

The ATTICA study consisted of men and women, randomly selected from all areas of Attica region in Greece. In this work, a random sub-sample from the ATTICA study's database was studied, consisting of 551 men (41 ± 11 years) and 467 women (38 ± 11 years), with complete nutritional and biochemical information. Dietary habits were evaluated using a validated food-frequency questionnaire. The dietary antioxidant capacity was based on published values for Italian foods measured by three different assays: ferric-reducing antioxidant power (FRAP), total radical-trapping antioxidant parameter (TRAP) and Trolox equivalent antioxidant capacity (TEAC). Inverse, age-energy adjusted correlations were observed between FRAP and log-glucose (r = -0.149, p = 0.001), log-insulin (r = -0.221, p = 0.001) and log-HOMA-IR (r = -0.186, p = 0.001) concentration, as well as with TRAP and TEAC. After controlling for age, gender, body mass index, physical activity status, smoking habits and energy intake, multi-adjusted analysis confirmed the previous relationships only among participants who were not on the Mediterranean dietary pattern.

CONCLUSIONS

Although more prospective studies are required, the data presented support the view that dietary modification towards higher consumption of antioxidants should be implemented in public health strategies, in order to better control glycemic markers in individuals, and prevent the development of diabetes at the population level.

Renal function, cardiovascular disease risk factors' prevalence and 5-year disease incidence; the role of diet, exercise, lipids and inflammation markers: the ATTICA study

BACKGROUND

We aimed to evaluate the association between renal function and various cardiovascular disease (CVD) risk factors, as well as 5-year incidence of CVD, in a sample of CVD free adults.

METHODS

(i) Cross-sectional information from n = 1975. Greek men and women (>18 years) without CVD and hypertension at baseline examination and (ii) 5-year (2001-06) survival data from n = 2101 individuals without CVD at baseline, all participants in the ATTICA study, were analysed in this work. Kidney function was quantified by the baseline estimated creatinine clearance rate (C(cr)), using the Cockcroft-Gault formula and the National Kidney Foundation recommendations. Outcome of interest was the development of CVD that was defined according to WHO-ICD-10 criteria.

RESULTS

At baseline, the prevalence of moderate-to-severe renal dysfunction (i.e. C(cr) < 60) was 2.8% in males and 7.7% in females. Physical activity status, cigarette smoking, hypercholesterolemia and homocysteine levels and greater adherence to the Mediterranean diet were inversely associated with C(cr) rate (P < 0.05), while no association was found with history of diabetes. During the 5-year follow-up, people with moderate-to-severe renal dysfunction as compared with normal, had 3.21 times higher CVD risk [95% confidence interval (CI) 1.98-5.19], after adjusting for history of hypertension (hazard ratio = 2.15, 95% CI 1.48-3.11), hypercholesterolemia (1.37, 0.98-1.98), diabetes (3.28, 2.15-5.00), smoking habits (0.89, 0.60-1.32) and physical activity status (0.86, 0.56-1.21).

CONCLUSION

Renal function seems to be associated with the levels of lifestyle and bio-clinical CVD risk factors and contribute to the long-term incidence of cardiac events. Public health care practitioners should take into account renal function in better preventing the burden of CVD at individual, and population level, as well.

Resistance exercise plus to aerobic activities is associated with better lipids' profile among healthy individuals: the ATTICA study

BACKGROUND

The influence of different types of exercise on risk factors for cardiovascular diseases has rarely been investigated. The aim of the present work was to evaluate the effect of adding resistance exercise to aerobic activities on lipid-lipoprotein profile, in a representative sample of men and women from the province of Attica, Greece.

METHODS

We randomly enrolled 1514 and 1528 healthy men and women, respectively, stratified by city, age and gender distribution. Participants were classified as inactive (INA), sufficiently active (SA) and highly active for either aerobic activities (HAA) alone or a combination of aerobic plus resistance exercise (HAC). The main outcome measures are lipid-lipoprotein profile [total, high-density lipoprotein (HDL) cholesterol, low-density lipoprotein (LDL) cholesterol, triglycerides, apolipoprotein-A1, apolipoprotein-B] and anthropometric indices.

RESULTS

From those participating in aerobic activities, 480 (31.7%) men and 502 (32.9%) women were classified as SA, 100 men (6.6%) and 93 women (6.1%) as HAA and 90 men (5.9%) and 49 women (3.2%) as HAC. After various adjustments were made, men from the HAC group had an average of 23% lower plasma triacylglycerol concentration (P = 0.04) and 10% lower LDL-cholesterol (P = 0.01) when compared with the HAA group. Moreover, women from the HAC group had 13% lower LDL-cholesterol when compared with HAA group (P = 0.051).

CONCLUSION

These data suggest that combining aerobic and resistance-type activities may confer a better effect on lipoprotein profile in healthy individuals than aerobic activities alone.

Apolipoprotein E polymorphism is not associated with lipid levels and coronary artery disease in Greek patients with familial hypercholesterolaemia

Familial hypercholesterolaemia is a genetic disorder characterised by high low-density lipoprotein (LDL) cholesterol concentrations, which frequently gives rise to premature coronary artery disease (CAD). The clinical expression of familial hypercholesterolaemia is highly variable even in patients carrying the same LDL receptor gene mutation. This variability may be due to environmental and other genetic factors. Apolipoprotein E (Apo-E) has been extensively studied for its effects on the phenotype of familial hypercholesterolaemia. In this study we examined the influence of Apo-E genotype on lipid parameters and the incidence of CAD in 93 Greek patients with familial hypercholesterolaemia. Apo-E E2, E3 and E4 allele frequencies were 0.06, 0.86 and 0.09 respectively. The levels of total cholesterol, LDL cholesterol, HDL cholesterol, triglycerides, apolipoproteins A and B and lipoprotein alpha did not differ significantly among carriers and non-carriers of the E4 allele. The prevalence of CAD and hypertension did not differ either. Our results suggest that the E4 allele is not associated with lipid levels or with the prevalence of CAD among familial hypercholesterolaemia patients of the Greek population.

FH clinical phenotype in Greek patients with LDL-R defective vs. negative mutations

BACKGROUND

Familial hypercholesterolaemia (FH) is caused by mutations in the low-density lipoprotein receptor gene and the gene encoding apolipoprotein B-100, affecting one in 500 individuals.

METHODS

One hundred and eighty-three Greek FH patients were screened for mutations on the LDLR and ApoB genes.

RESULTS

We identified mutations in 67 probands and 11 relatives. Sixteen mutations located in eight different exons and the promoter of the LDLR were discovered. Among them 10 were missense mutations (C6W, S265R, A370T, Q363P, D365E, V408M, A410T, A517T, G528D, G571E), two were nonsense mutations (Q363X and C660X), three were splice defects (2140 + 5G-->A and 2140 + 9C-->T, 1706 - 10G-->A), and one was a nucleotide substitution (- 45delT) on the promoter. None of the subjects carried any apoB mutation. The detection rate of mutations in this study was 43%. From the above mutations, A410T, A519T and the splice site defects 2140 + 9C-->T were detected for the first time in the Greek population. Among them V408M, G528D, C6W and S265R account for 73% of heterozygous FH probands. V408M mutation is more common in Central West, while C6W is more common in Central East. Separating the patients into two groups (receptor defective and receptor negative) we found that the receptor negative group had higher levels of total cholesterol, low-density lipoprotein cholesterol and higher prevalence of tendon xanthomas compared with the receptor-defective group.

DISCUSSION

The homogenous molecular basis of familial hypercholesterolaemia in Greece facilitates the application of a DNA diagnostic strategy based on the origin of the patient. The early mutation analysis would add valuable information on the severity of the disease.

FH-Pyrgos: a novel mutation in the promoter (−45delT) of the low-density lipoprotein receptor gene associated with familial hypercholesterolemia

In a patient with familial hypercholesterolemia (FH), we have identified a new mutation (-45delT) in repeat 3 of the low-density lipoprotein receptor (LDLR) gene promoter. Analysis of a neutral polymorphism in the LDLR mRNA from the patient's white blood cells showed that the expression of one allele was significantly reduced, and cells have only 24% of LDLR activity by binding and uptake of DiI-LDL. Transient transfection studies using a luciferase gene reporter revealed that the -45delT mutation considerably reduces the transcriptional activity of the LDLR promoter and strongly suggest that the mutation is the cause of the FH phenotype.

Association between exposure to environmental tobacco smoke and the development of acute coronary syndromes: the CARDIO2000 case-control study

OBJECTIVE

To investigate the association between environmental tobacco smoke (ETS) exposure (at least 30 minutes a day) and the risk of developing acute coronary syndromes (ACS).

DESIGN AND SETTING

The CARDIO2000 is a case-control study which was conducted in Greece from 2000 to 2001. Cases included 847 individuals with a first event of ACS and 1078 cardiovascular disease-free controls. Cases and controls were frequency matched on age (within three years of age), sex, and region.

MAIN OUTCOME MEASURES

ACS was defined as a diagnosis of first acute myocardial infarction or unstable angina. Main independent variable: Exposure to ETS was measured by self report as follows: after the second day of hospitalisation for the cases, and at the entry for the controls, participants were asked whether they were currently exposed to tobacco smoke from other people (home and/or work) for more than 30 minutes a day. The responses were categorised into three levels: no exposure, occasional exposure (< 3 times per week), and regular exposure. In addition participants were asked how many years they had been exposed. Because these were self reported assessments and prone to bias, the results were compared to reports obtained from subjects' relatives or friends, using the Kendal's tau coefficient that showed high agreement.

RESULTS

731 (86%) of the patients and 605 (56%) of the controls reported current exposure of 30 minutes per day or more to ETS. Among current non-smokers, cases were 47% more likely to report regular exposure to ETS (odds ratio (OR) 1.47, 95% confidence interval (CI) 1.26 to 1.80) compared to controls. Exposure to ETS at work was associated with a greater risk of ACS compared to home exposure (+97% v +33%). The risk of ACS was also raised in active smokers (OR 2.83, 95% CI 2.07 to 3.31) regularly exposed to ETS.

CONCLUSIONS

This study supports the hypothesis that exposure to ETS increases the risk of developing ACS. The consistency of these findings with the existing totality of evidence presented in the literature supports the role of ETS in the aetiology of ACS.

The effect of the combination of Mediterranean diet and leisure time physical activity on the risk of developing acute coronary syndromes, in hypertensive subjects

The World Health Organization reports that the number of hypertensives, worldwide, is estimated to be 600 million people. In addition a considerable proportion of hypertensive subjects remains untreated or uncontrolled. In this work we investigated the combined effect of physical activity and Mediterranean diet on coronary risk, in hypertensives. Thus we randomly selected, from all Greek regions, 848 hospitalised patients (695 males, 58 +/- 10 years old and 153 females, 65 +/- 9 years old) with a first event of coronary heart disease (CHD) and 1078 paired, by sex, age, region controls, without any suspicions for CHD. Physically active were those who reported non-occupational physical activity more than once per week. Subjects 'closer' to the Mediterranean diet were assessed through a special nutrient questionnaire. A total of 418 (49%) of the patients and 303 (28%) of the controls were hypertensive. Of these, 115 (27%) patients and 70 (23%) controls were untreated, 148 (35%)-111 (36%) were uncontrolled and 155 (38%)-122 (41%) were controlled (P-value <0.01). One hundred and sixty-two (19%) of the patients and 265 (25%) of the controls (P < 0.01) were 'closer' to the combination of Mediterranean type of diet and physical activity. The analysis showed that the previous combination is related to a 25% reduction of the coronary risk in controlled hypertensive subjects (OR = 0.75, P < 0.01), a 11% reduction in untreated (OR = 0.89, P < 0.05) and 17% reduction (OR = 0.83, P < 0.05) in uncontrolled, after adjusting for age, sex, educational and financial level and the conventional cardiovascular risk factors. Consequently, the adoption of Mediterranean diet by physically active subjects seems to reduce significantly the coronary risk and prevent, approximately, the one-third of acute CHD, in controlled hypertensive subjects.

Influence of biological factors on lipid and fibrinogen measurements in young men. An epidemiological study in 2009 recruits

AIMS

The aim of the present study was to detect significant relationships between lipid and fibrinogen measurements and several biological factors in young men.

METHODS AND RESULTS

Medical history was obtained, and plasma lipids, lipoprotein (a) and fibrinogen levels were measured in 2009 male Greek army recruits (mean age 22.37+/-3.03 years) not taking any drugs. Plasma levels were as follows: total cholesterol, 171+/-34 mg x dl(-1), low density lipoprotein (LDL) cholesterol, 111+/-34 mg x dl(-1), high density lipoprotein (HDL) cholesterol, 45+/-10 mg x dl(1), and triglycerides, 74+/-32 mg x dl(-1). Lipoprotein (a) and fibrinogen were 18+/-13 and 278+/-67 mg x dl(-1). The atherosclerotic index, calculated as the ratio of total cholesterol/HDL, was 4+/-1. Analysis of multivariate models that included potentially confounding factors revealed the following: body mass index, season of year during which blood examinations were performed, alcohol consumption, and place of residence were found to be significantly associated with plasma levels of total cholesterol, LDL-cholesterol, fibrinogen and the atherosclerotic index in the pooled population. Season and physical activity were significantly associated with HDL-cholesterol, whereas season and family history of acute myocardial infarction were associated with triglycerides levels. Body mass index, family history of myocardial infarction and physical activity were associated with lipoprotein (a).

CONCLUSION

Body mass index, season, alcohol consumption and place of residence are markers of plasma lipid profile and fibrinogen in young men. A family history of acute myocardial infarction and physical activity are related to lipoprotein (a).

Aortic stiffness in young patients with heterozygous familial hypercholesterolemia

BACKGROUND

Dyslipidemia is a primary risk factor for the development of atherosclerosis. Aortic distensibility is an important determinant of left ventricular function and coronary blood flow whose possible alterations in patients with dyslipidemia have not been fully investigated.

METHODS

To assess the effect of dyslipidemia on the elastic properties of the aorta, we studied 60 patients (mean age 37+/-11 years) with heterozygous familial hypercholesterolemia and no manifest arterial disease and compared them with 20 of their normolipidemic siblings (mean age 34+/-10 years). Two indexes of the aortic elastic properties were measured: aortic distensibility was calculated by use of the formula: 2 x (AoS-AoD)/PP x AoD, and aortic stiffness index was calculated by use of the formula: In (SBP/DBP)/(AoS-AoD)/AoD, where AoS and AoD are aortic root end-systolic and end-diastolic diameters, respectively, SBP and DBP are systolic and diastolic arterial pressure, respectively, and PP is pulse pressure. Internal aortic root diameters were measured at 3 cm above the aortic valve by use of two-dimensional guided M-mode transthoracic echocardiography, and arterial pressure was measured simultaneously at the brachial artery by sphygmomanometry.

RESULTS

The mean aortic systolic and diastolic diameter index did not differ significantly between the two groups. In contrast, aortic distensibility was found to be significantly reduced in subjects with isolated familial hypercholesterolemia compared with that in the control group (2.15+/-1.72 cm2.dynes(-1).10(-6) vs 3.18+/-1.58 cm2.dynes(-1).10(-6), p < 0.02). In addition, the mean aortic stiffness index was double in patients with familial hypercholesterolemia compared with that in normolipidemic subjects.

CONCLUSIONS

Severe dyslipidemia does not overtly influence aortic dimensions but leads to impairment of aortic elastic properties before the occurrence of clinical manifestations of atherosclerotic disease.