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Biomedical subjects

Mehmet Yazici

Publications and source records attributed to Mehmet Yazici.

At least 19 recordsLinked to original sources
PubMed2007

Obstructive sleep apnea syndrome is associated with metabolic syndrome rather than insulin resistance.

The aim of this study was to investigate cross-sectionally the prevalence and covariates of obstructive sleep apnea syndrome (OSAS) and its relationship to metabolic syndrome (MS), insulin resistance (IR), and coronary heart disease (CHD) in a population sample of 1,946 men and women representative of Turkish adults. OSAS was identified when habitual snoring and episodes of apnea were combined with another relevant symptom. MS was diagnosed based on modified criteria of the Adult Treatment Panel III and IR by homeostatic model assessment (HOMA). OSAS was identified in 61 men (6.4%) and 58 women (5.8%), at a similar prevalence, after adjusting for covariates. Among individuals with OSAS, significantly higher odds ratios (ORs), adjusted for age, body mass index (BMI), and waist girth, were observed for MS, hypertension, and prevalent CHD, but not for HOMA or menopause. Significantly higher C-reactive protein existed only in women with OSAS who were also more frequent smokers. In logistic regression models, waist circumference, but not BMI nor hypertension, was significantly associated with OSAS among men. In women, by contrast, current cigarette smoking and hypertension were the significant independent covariates. Regression models controlling for sex, age, and smoking revealed that MS (and not IR per se) was associated significantly with OSAS (OR 1.94) in nondiabetic individuals. To conclude, abdominal rather than overall obesity in men and smoking among women are significant independent determinants of OSAS in Turkish adults. OSAS is associated with MS rather than IR per se. Relatively high prevalence of OSAS is observed in Turkish women in whom it is significantly associated with CHD.

Adult↗
PubMed2006

Serum uric acid is a determinant of metabolic syndrome in a population-based study.

BACKGROUND: Determination of serum uric acid concentrations and role in risk of metabolic syndrome (MS) were investigated in 1877 participants in a cross-sectional population-based study including a brief follow-up. METHODS: The MS was identified by modified criteria of the Adult Treatment Panel III, and coronary heart disease (CHD) by clinical findings and Minnesota coding of resting electrocardiograms. Uric acid concentrations were measured by the uricase method. RESULTS: Metabolic syndrome was present in 39.1% of the cohort. Linear regression analysis of uric acid levels in a model comprising 13 variables identified gender, waist girth, total cholesterol (TC), alcohol usage, triglycerides, log C-reactive protein (CRP), and log gamma-glutamyl transferase (GGT), and in women diuretic use and elevated blood pressure (BP), as significant independent covariates whereby the largest contribution (1.6 mg/dL) was generated by waist girth. Logistic regression analysis of serum uric acid for MS disclosed for the top versus the bottom tertile an odds ratio (OR) of 1.89 (95% confidence interval [CI]: 1.45-2.46) in men and women combined, after adjustment for sex, age, TC, log CRP, log GGT, alcohol, and diuretic drug use, presence of diabetes/impaired fasting glucose, elevated BP, and smoking status. This corresponded to an increase by 35% in MS likelihood for each 1 SD uric acid increment. This rate declined to a significant 15% by inclusion of waist girth into the model. The OR of uric acid concentrations for prevalent and incident CHD, adjusted for age, MS, smoking, and diuretic use, was not significant among women and only tended toward significance in men. CONCLUSIONS: Abdominal obesity is the main determinant of uric acid variance. An increment of 1 SD in serum uric acid levels are associated in both sexes with a 35% higher MS likelihood, independent of 10 risk factors related to MS. After adjustment for waist girth, a more modest but significant likelihood persists, which suggests that serum uric acid is a determinant of MS.

Abdominal Fat↗
PubMed2006

Discordance between insulin resistance and metabolic syndrome: features and associated cardiovascular risk in adults with normal glucose regulation.

The aims of this study were to investigate the extent of concordance between metabolic syndrome (MS) and insulin resistance (IR), the features of discordance, and the magnitude of their independent association with cardiovascular disease (CVD) risk. After exclusion of individuals with diabetes and impaired fasting glucose, the population sample of 1534 men and women, representative of Turkish adults (mean age, 52.2 years), were evaluated cross-sectionally and at a mean 2 years' follow-up. Metabolic syndrome was identified by criteria of the Adult Treatment Panel III, except for male waist circumference (>94 cm). Insulin resistance was defined by the upper quartile in the sample (>2.245) of the homeostatic model assessment (HOMA) index. Clinical fatal and nonfatal CVD existed or developed in 165 subjects. Waist circumference proved to be by far the strongest significant determinant of HOMA in both sexes, followed by triglycerides. The cohort was categorized into 4 by the presence or absence of MS and IR. Each of the latter represented 34% and 25%, but together constituted 45% of the sample, thus disclosing concordance in a third of the conditions combined. The nonconcordant IR/NoMS group was less common than the MS/NoIR group and was distinct from the latter in having significantly lower waist girth, blood pressure, apolipoprotein B and triglyceride levels, and higher high-density lipoprotein cholesterol, glucose, and insulin levels and physical activity in both sexes. When adjusted for 5 important risk factors, although the excess risk in men with MS failed to attain significance, men with IR were associated with a significant 1.9-fold CVD risk. The IR/NoMS group had a 2.2-fold (95% confidence interval, 0.97-5.11) CVD likelihood compared with the large insulin-sensitive group, after adjustment for age, sex, log C-reactive protein, low-density lipoprotein cholesterol, smoking status, physical activity, and the 2 groups of MS with or without IR. Overlapping between MS and IR is limited in either sex, and MS/NoIR is more common than IR/NoMS. Overall, IR is more significantly associated with CVD risk than MS in men and in both sexes after adjustment for important confounders. Insulin resistance without MS tends to implicate in middle-aged and elderly Turkish men roughly a 2-fold CVD risk, corresponding to 50% excess risk per 1 SD in HOMA index, independent of MS and important covariates.

Adult↗
PubMed2006

Association between A/C1166 gene polymorphism of the angiotensin II type 1 receptor and biventricular functions in patients with acute myocardial infarction.

BACKGROUND: Although there have been several association studies of angiotensin II type 1 receptor (AT1R, A/C1166) gene polymorphism in clinical endpoints such as myocardial infarction (MI), hypertension, aortic stiffness, and left ventricular mass, the relationship between AT1R polymorphism and biventricular function in acute anterior MI has not been studied before. METHODS AND RESULTS: The study group comprised 132 consecutive patients who were admitted to the coronary care unit with their first acute anterior MI. Systolic and diastolic diameters, volumes, inflow properties, ejection fraction and myocardial performance index of both ventricles were measured. AT1R polymorphism was determined using polymerase chain reaction amplification. Based on A/C1166 polymorphism of AT1R, the patients were classified into 3 groups: group 1, A/A (n=91) genotype, group 2 A/C (n=28), and group 3 C/C (n=13) genotype. When the left ventricular and right ventricular echocardiographic functions were compared, all parameters of the 3 groups were found to be similar. No difference was detected in either the genotype distribution or allele frequencies between the patients and the controls for AT1R. CONCLUSIONS: The results suggest that A/C1166 polymorphism of AT1R did not influence the risk of either acute MI or biventricular function after anterior MI.

Aged↗
PubMed2005

Plasma triglycerides, an independent predictor of cardiovascular disease in men: a prospective study based on a population with prevalent metabolic syndrome.

BACKGROUND AND METHODS: We aimed to assess whether fasting plasma triglycerides independently predicted future fatal and nonfatal cardiovascular disease (CVD) in a population having a high prevalence of the metabolic syndrome. In the Turkish Adult Risk Factor Study, a population-based survey, 2682 men and women 20 years of age or over with fasting triglyceride values available and free of CVD at baseline examination in 1990, were prospectively followed up till 2003/04. Triglyceride concentrations were measured by the enzymatic dry chemistry method and stratified into sex-specific quintiles. Information on the mode of death was obtained from first-degree relatives and/or health personnel of local health office. Diagnosis of coronary heart disease and stroke among survivors was based on history, physical examination of the cardiovascular system and Minnesota coding of resting electrocardiograms. A total of 120 fatal and 221 new nonfatal CVD occurred among adults (mean age 43+/-14) during a mean 9.3 years of follow-up. RESULTS: CVD was significantly and independently predicted by the top versus the bottom fasting triglyceride quintile in logistic regression analyses when adjusted for age, sex, BMI, systolic blood pressure, total cholesterol, lipid-lowering medication, status of smoking and of glucose regulation (relative risk [RR] in men and all adults 2.38 and 1.79, respectively, p both <0.02). This corresponded to hazard ratios (HR) of 1.43 in men and 1.28 in men and women combined. Adjustment for HDL-cholesterol instead of total cholesterol in the same model gave also significant HRs corresponding to 1.42 in men and 1.32 in sexes combined. CONCLUSIONS: Fasting triglycerides are predictive of future CVD among men with an HR of 1.4, independent of age, diabetes, lipid-lowering medication, traditional risk factors including total cholesterol or HDL-C, in a population in which metabolic syndrome prevails. A modest independent risk increment in women did not reach significance.

Adult↗
PubMed2005

Transient silent ischemia after percutaneous transluminal coronary angioplasty manifested with a bizarre electrocardiogram.

Silent myocardial ischemia is recognized as a common manifestation after percutaneous coronary interventions possibly due to induction of coronary artery spasm. A 54-year-old man was performed primary percutaneous transluminal coronary angioplasty with the diagnosis of acute myocardial infarction. His 18-hour control electrocardiogram showed big-notched inverted T waves in precordial, III, and aVF leads without any chest pain. These bizarre electrocardiographic findings were restored after a brief period indicating silent ischemia that is caused by coronary artery spasm.

Angioplasty, Balloon, Coronary↗
PubMed2005

Cross-sectional study of complement C3 as a coronary risk factor among men and women.

In the present study, we examined (i) whether C3 (complement C3) was an independent marker of prevalent CHD (coronary heart disease), and (ii) which preferential associations existed between C3 and some cardiovascular risk factors when jointly analysed with CRP (C-reactive protein) and fibrinogen. In a cohort of 756 unselected adults, 39% of whom had the metabolic syndrome, C3 and other risk variables were evaluated in a cross-sectional manner. In a logistic regression model for the likelihood of CHD, a significant OR (odds ratio) of 3.5 [95% CI (confidence intervals), 1.27 and 9.62)] for C3 was obtained after adjustment for smoking status, TC (total cholesterol) and usage of statins. A similar model, also comprising systolic blood pressure, with a cut-off point of >or=1.6 g/l C3 exhibited a 1.9-fold risk (95% CI, 1.01 and 3.58) compared with individuals below the cut-off point. Both analyses displayed an adjusted OR of 1.37 for each S.D. increment in C3. The significant relationship of C3 with a likelihood of CHD also proved to be independent of CRP. In multiple linear regression models, associations were tested for each acute-phase protein with measures of obesity, fasting insulin, triacylglycerols (triglycerides), TC, HDL (high-density lipoprotein)-cholesterol, physical activity, smoking status, diagnosis of metabolic syndrome and family income. When both genders were combined, C3 was independently associated with serum triacylglycerols, waist circumference, BMI (body mass index) and TC. CRP was independently associated with waist circumference, TC, family income (inversely) and physical activity, and fibrinogen with BMI, TC, smoking status and metabolic syndrome. In summary, elevated levels of complement C3 are associated with an increased likelihood of CHD independent of standard risk factors and regardless of the presence of acute coronary events, suggesting that C3 might be actively involved in coronary atherothrombosis. Unlike CRP and fibrinogen, C3 was preferentially associated with waist girth and serum triacylglycerols.

Adult↗
PubMed2005

Elastic properties of the ascending aorta and left ventricular function in patients with hypothyroidism.

BACKGROUND: We sought to clarify the possible role of elastic properties of the ascending aorta in the development of cardiac disease associated with hypothyroidism (HT). METHODS: A total of 37 patients with HT (age: 39.3 +/- 8.9 years) and 29 control subjects were studied. Ascending Aortic (Ao) diameter, Ao elastic indexes, strain (AoST), distensibility (AoD), stiffness index (AoSI), and pressure strain modulus were calculated from the echocardiographically derived Ao diameters. Myocardial performance index (MPI), E/A ratio, isovolumetric relaxation time (IVRT), deceleration time (DT) were measured by Doppler echocardiography to assess diastolic LV function. Patients were treated with levothyroxine and followed-up for 6 months. Thyroid function tests and echocardiographic measurements were repeated at the end of the study. RESULTS: AoD (cm2 dyn(-1) 10(-3)) and AoST (%) were significantly lower (3.8 vs. 6.1; P < 0.001, 7.4 vs. 12.6, P < 0.001; respectively), whereas AoSI was higher in HT patients (6.2 vs. 3.3; P < 0.001). After treatment, AoD and AoST were increased (5.7; P < 0.001 and 11.8; P < 0.001; respectively), whereas AoSI was decreased significantly (3.7; P < 0.001). Also, early/late mitral peak velocity ratio (Emax/Amax) was significantly lower in HT patients (1.19 vs 1.34; P < 0.01), whereas MPI was higher (0.52 vs. 0.42; P < 0.001). MPI showed a strong correlation with aortic root indexes [AoST (r =-0.61/P < 0.001); AoD, (r =-0.57/P < 0.002); AoSI, (r = 0.53/P < 0.005)] in the HT group. After 6 months of therapy, MPI significantly decreased P < 0.001) and E/A ratios were normalized (P < 0.001). CONCLUSIONS: Ao root functions have an important role on diastolic LV function. Levothyroxine replacement therapy can reverse all of these adverse effects of HT.

Adult↗
PubMed2005

Effect of reperfusion on P-wave duration and P-wave dispersion in acute myocardial infarction: primary angioplasty versus thrombolytic therapy.

BACKGROUND: Atrial fibrillation (AF) is a common arrhythmia occurring in about 10-20% of patients with acute myocardial infarction (AMI). P-wave dispersion (PWd) and P-wave duration (PWD) have been used to evaluate the discontinuous propagation of sinus impulse and the prolongation of atrial conduction time, respectively. This study was conducted to compare the effects of reperfusion either by thrombolytic therapy or primary angioplasty on P-wave duration and dispersion in patients with acute anterior wall myocardial infarction. METHODS: We have evaluated 72 consecutive patients retrospectively (24 women, 48 men; aged 58 +/- 12 years) experiencing acute anterior wall myocardial infarction (AMI) for the first time. Patients were grouped according to the reperfusion therapy received (primary angioplasty (PTCA) versus thrombolytic therapy). Left atrial diameter and left ventricular ejection fraction (LVEF) were determined by echocardiography in all patients. Electrocardiography was recorded from all patients on admission and every day during hospitalization. Maximum (P max) and minimum (P min) P-wave durations and P-wave dispersions were calculated before and after the treatment. RESULTS: There were not any significant differences between the groups regarding age, gender, left ventricular ejection fraction, left atrial diameter and volume, cardiovascular risk factors, and duration from symptom onset to treatment. P-wave dispersions and P-wave durations were significantly decreased after PTCA [Mean P max was 113 +/- 11 ms before and 95 +/- 17 ms after the treatment (P = 0.007)]. Mean PWd was 46 +/- 12 ms before and 29 +/- 10 ms after the treatment (P = 0.001). Also, P max and PWd were significantly lower in PTCA group (for P max 97 +/- 22 ms vs 114 +/- 16 ms and for PWd 31 +/- 13 ms vs 55 +/- 5 ms, respectively). CONCLUSIONS: Primary angioplasty reduces the incidence of AF by decreasing P max and P-wave dispersion.

Angioplasty, Balloon, Coronary↗
PubMed2005

[Lipoprotein (a) in a population-based study: more significant in Turkish women than men?].

OBJECTIVE: Serum lipoprotein(a) [Lp(a)] concentrations, determined in 665 persons in the 2003/04 survey of the Turkish Adult Risk Factor Study, were investigated in regard to distribution, determinants and relationship to cardiovascular risk factors, metabolic syndrome (MS) and coronary heart disease (CHD). METHODS: Diagnosis of MS was based on Adult Treatment Panel III criteria, that of CHD on the presence of clinical findings and Minnesota coding of resting electrocardiograms. Metabolic syndrome was observed in 44%, CHD in 14% of the study sample. Behring nephelometry was used for Lp(a) values measurements which were log-transformed for analyses because of skewing. RESULTS: Geometric mean values of Lp(a) in 286 men and 379 women, aged 55.5 +/-12.0 years, were 9.46+/-2.90 mg/dL and 10.46+/-3.00 mg/dL (p>0.2), respectively. Apart from a slight correlation with age, Lp(a) exhibited significant positive correlations with apolipoproteins A-I and B, low density lipoprotein-cholesterol (LDL-C) (r =0.15), total cholesterol, high density lipoprotein-cholesterol (HDL-C), systolic blood pressure and log C-reactive protein, and inverse ones with thyroid stimulating hormone (r =-0.25) in men, and log gamma glutamyltransferase in women. Further 10 variables were not significantly correlated in either gender. In linear regression analyses for independent covariates of Lp(a), positive associations were noted with serum total cholesterol and systolic blood pressure, and inverse ones with waist circumference, triglycerides and (only in women) with gamma glutamyltransferase. Logistic regression analyses revealed in men no association with either MS or CHD likelihood. Among women, age-adjusted Lp(a) was associated inversely at a borderline significance with MS, as did levels of Lp(a) >30 mg/dl vs. the remaining sample, controlled for age and MS, display an odds ratio (OR) of 1.62 for prevalent CHD (p=0.20). An OR of 1.92 (p<0.19) was noted in all adults for the coexistence of Lp(a) >30 mg/dl and LDL-C >150 mg/dl, after controlling for age, MS, smoking status and LDL-C categories. CONCLUSION: Lipoprotein(a), the variance of which is known to be overwhelmingly due to the apo(a) isoforms, proved to have a significant inverse independent association with a measure of abdominal obesity. Lipoprotein(a) levels appeared not to be associated with risk for MS or CHD among men. In women, however, high Lp(a) levels were accompanied with an environment less prone to MS, and - without attaining significance -- tended to be associated with CHD likelihood, independent of age and MS. Further studies are warranted in this area.

Adult↗
PubMed2004

In vivo effect of losartan on platelet aggregation in patients with hypertension.

The angiotensin II receptor, losartan, has been found to inhibit platelet aggregability to some extent in in vitro experiments. There have been conflicting results about the in vivo effects of losartan. We sought to clarify the in vivo effect of losartan on platelet aggregation. Forty patients with grade I essential hypertension were treated with losartan for 3 weeks. Platelet aggregation tests with adenosine diphosphate (ADP) and ristocetin were analyzed and compared before and at the end of the study. Losartan effectively decreased systolic (SBP) and diastolic (DBP) blood pressure. Mean SBP before and after treatment was 159.6 +/- 12.8 and 149.2 +/- 17.3 mmHg, respectively. Mean DBP decreased from 93.7 +/- 8.2 to 87.7 +/- 10.3 mmHg after treatment. The results of the platelet aggregation tests with ADP and ristocetin were not significantly different when both rate and amplitude of maximal aggregation were included. Peak platelet aggregation with ADP regarding the lowest light transmission in the aggregometer was 59.8% +/- 24.3% before and 58.3% +/- 18.1% after the treatment. The same variables with ristocetin were 66.8% +/- 21.6% and 60.8% +/- 23.3%, respectively. In vivo effects of losartan on platelet aggregation with ADP and ristocetin were insignificant.

Adenosine Diphosphate↗
PubMed2004

Effects of iohexol on ventilatory functions in patients undergoing diagnostic coronary angiography.

BACKGROUND AND OBJECTIVES: Adverse respiratory reactions have been reported with intravascular radiographic contrast media. The aim of the present study is to assess the effects of iohexol on pulmonary functions in patients undergoing diagnostic coronary angiography (CA). MATERIALS AND METHODS: 30 patients enrolled in the study. The respiratory functions of the patients were measured at three different stages during angiography (before, immediately after and 2 h later) and arterial blood gas analyses were performed at six stages during CA (before, immediately after the insertion of angiography catheter, 2 min after the injection of contrast agent, at the end of angiography, an hour and 2 h after angiography). A single, experienced angiographer performed the angiography procedures via radial artery route. Totally six multiple angled views of the left and right coronary arteries were recorded in all patients by hand injection. None of the patients were performed ventriculography. RESULTS: Angiography caused significant reduction in forced expiratory volume in 1 sec [FEV1] (from 103 +/- 15 to 95 +/- 17, p < 0.01), forced vital capacity [FVC] (from 99 +/- 13 to 95 +/- 18, p < 0.05) and maximum mid-expiratory flow rate [MMF] (from 95 +/- 33 to 84 +/- 29, p < 0.01) whereas there were no significant changes in the mean FEV1/FVC ratios at different stages of angiography. Statistically significant decrease in PaO2 (from 91 +/- 10 to 85 +/- 13 mmHg, p < 0.01) and arterial O2 saturation (from 97 +/- 1% to 96 +/- 1%, p < 0.01) were also observed. Data in present study showed a clinically insignificant but statistically significant restrictive impairment in pulmonary functions. CONCLUSIONS: Diagnostic CA using iohexol decreases ventilatory functions in a small but significant extent in patients without any overt pulmonary disease.

Carbon Dioxide↗
PubMed2004

Effects of thyroxin therapy on cardiac function in patients with subclinical hypothyroidism: index of myocardial performance in the evaluation of left ventricular function.

OBJECTIVE: We investigated the effects of thyroxine (T4) therapy on the cardiac function in subclinical hypothyroidism (SHT) by using the index of myocardial performance (IMP) and the conventional echocardiographic parameters. METHODS: Forty-five SHT patients (F/M:38/7, age 39.9+/-7.9) and 29 healthy subjects (F/M:25/4, age 38.3+/-8.6) were studied. Patients were randomly assigned, in a double-blind manner to receive T4 therapy (group I) or a placebo (group II) and for a period of up to 12 months, were followed up using thyroid function tests and both conventional and Doppler echocardiographic measurements. RESULTS: At the baseline, the SHT patients has a significantly higher isovolumic relaxation time (IRT) (98.3+/-23.7 vs. 81.7+/-14.7<0.01), IMP (0.52+/-0.06 vs. 0.42+/-0.05; P<0.001), A max (late mitral peak velocity) (83.4+/-12.6 vs. 74.3+/-13.5; P<0.01) and significantly lower (early mitral peak velocity) Emax/Amax ratio (1.19+/-0.18 vs. 1.34+/-0.17; P<0.01) than the individuals in the control group. In group I, the thyroid hormone profile became normalized after 1 year of L-T4 therapy, but there was no significant change in the left ventricular (LV) morphology or systolic function. After 1 year of follow-up, group I showed a significant reduction of MPI (0.53+/-0.05 vs. 0.42+/-0.07; P<0.001), Amax (84.2+/-13.7 vs. 74.5+/-11; P<0.001) and IRT (98.6+/-23.7 vs. 82.9+/- 23.3; P<0.001) along with a normalization of the E/A ratio (1.17+/-0.16 vs. 1.33+/-0.19; P<0.001). Conversely, no change was observed in group II. CONCLUSIONS: An impairment of left ventricular diastolic function, which may be reversible with T4 therapy, was observed in the SHT patients, and IMP may be useful in the evaluation of LV myocardial dysfunction in these patients.

Adult↗
PubMed2004

Right atrial 'thrombus in transit' and atrial septal defect in a 70-year-old man: cardioembolic source of pulmonary and paradoxical cerebral embolization.

A 70-year-old man was admitted with sudden onset of dyspnea, near syncope and left hemiparesis. Clinical examination, blood gas analysis, ECG and the chest X-ray were consistent with pulmonary embolism. Transthoracic echocardiography (TTE) revealed right atrial free-floating thrombus, large atrial septal defect (ASD), right heart enlargement and pulmonary artery hypertension. Anticoagulation therapy was initiated immediately, soon after thrombolytic therapy was started but the patient died due to possible pulmonary or cerebral embolization. We underscore rapid diagnosis by TTE that revealed right heart thrombus in transit and large ASD.

Aged↗
PubMed2004

Large ascending aortic aneurysm and severe aortic regurgitation in a 7-year-old child with Marfan syndrome and a review of the literature. Marfan syndrome in childhood.

A 7-year-old girl was admitted because of dyspnea on exertion and palpitations. Her symptoms had gradually worsened for the last 6 months. She had physical features of the Marfan syndrome. Transthoracic echocardiography showed an ascending aortic aneurysm, severe aortic regurgitation, and mildly dilated left ventricle. Because of marked aortic aneurysm and severe aortic regurgitation, the patient was treated with a beta-blocker and an angiotensin converting enzyme inhibitor. Surgery was refused by her parents. We describe here a child with Marfan syndrome in whom significant dilatation of the ascending aorta and severe aortic regurgitation is encountered and major cardiovascular complications of Marfan syndrome were reviewed.

Abnormalities, Multiple↗