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Biomedical subjects

M Tendera

Publications and source records attributed to M Tendera.

At least 19 recordsLinked to original sources

Selectin-P and interleukin-8 plasma levels in coronary heart disease patients.

BACKGROUND: Alterations of the immune system are now believed to play crucial role in the pathogenesis of atherosclerosis. The aim of this study was analysis of soluble forms of selectin-P and interleukin-8 levels in patients with different form of coronary heart disease. MATERIALS AND METHODS: In the study took part 18 patients with stable coronary heart disease, 20 patients with unstable coronary heart disease and 15 healthy persons from control group. Soluble selectin-P and interleukin-8 levels were measured in EDTA plasma with the use of enzyme immunoassay ELISA. RESULTS: The level of soluble selectin-P was significantly higher in unstable coronary heart disease patients in comparison to the stable coronary heart disease patients (P < or = 0.01) and nonsignificantly higher in comparison to the control group. The level of interleukin-8 were significantly higher in unstable coronary heart disease patients in comparison to the stable coronary heart disease patients (P < or = 0.01) and in comparison to the control group (P < or = 0.02). CONCLUSION: Our findings suggest that soluble form of selectin-P and interleukin-8 may be useful clinical predictors of unstable coronary heart disease. The assessment of the risk for the development of coronary heart disease requires further serial investigation.

Aged↗

Mutation A1298C of methylenetetrahydrofolate reductase: risk for early coronary disease not associated with hyperhomocysteinemia.

Diminished activity of 5,10 methylenetetrahydrofolate reductase (MTHFR), a regulatory enzyme of homocysteine metabolism, may predispose to coronary artery disease (CAD). In a case-control study we determined the prevalence of two common MTHFR polymorphisms, C677T and A1298C, in 161 male patients under the age of 50 years with angiographically documented CAD and compared it to that in 211 healthy controls. Genotyping was also performed in a random population sample, consisting of 149 men and 121 women at an average age of 40 years. The studied group had classic risk factors of atherosclerosis but did not differ in fasting plasma homocysteine, folic acid, and vitamin B12 levels in either the control group or population sample. The frequency of the 1298C allele was significantly higher in CAD (0.304) than in controls (0.199) or the population sample (0.235). Allele 1298C showed a significant association with early-onset CAD both in homozygotes and in heterozygous carriers. These findings were further supported by comparisons with the population sample. Homozygosity for allele 677T showed a tendency to associate with CAD. Allele 1298C of MTHFR is associated with early-onset CAD (carriers- RR = 1.71, 95% CI: 1.13-2.59; homozygotes- RR = 3.09, 95% CI: 1.36-7.02), even when blood homocysteine levels are not elevated.

Adolescent↗

Effect of carvedilol on survival in severe chronic heart failure.

BACKGROUND: Beta-blocking agents reduce the risk of hospitalization and death in patients with mild-to-moderate heart failure, but little is known about their effects in severe heart failure. METHODS: We evaluated 2289 patients who had symptoms of heart failure at rest or on minimal exertion, who were clinically euvolemic, and who had an ejection fraction of less than 25 percent. In a double-blind fashion, we randomly assigned 1133 patients to placebo and 1156 patients to treatment with carvedilol for a mean period of 10.4 months, during which standard therapy for heart failure was continued. Patients who required intensive care, had marked fluid retention, or were receiving intravenous vasodilators or positive inotropic drugs were excluded. RESULTS: There were 190 deaths in the placebo group and 130 deaths in the carvedilol group. This difference reflected a 35 percent decrease in the risk of death with carvedilol (95 percent confidence interval, 19 to 48 percent; P=0.00013, unadjusted; P=0.0014, adjusted for interim analyses). A total of 507 patients died or were hospitalized in the placebo group, as compared with 425 in the carvedilol group. This difference reflected a 24 percent decrease in the combined risk of death or hospitalization with carvedilol (95 percent confidence interval, 13 to 33 percent; P<0.001). The favorable effects on both end points were seen consistently in all the subgroups we examined, including patients with a history of recent or recurrent cardiac decompensation. Fewer patients in the carvedilol group than in the placebo group withdrew because of adverse effects or for other reasons (P=0.02). CONCLUSIONS: The previously reported benefits of carvedilol with regard to morbidity and mortality in patients with mild-to-moderate heart failure were also apparent in the patients with severe heart failure who were evaluated in this trial.

Adrenergic beta-Antagonists↗

Local delivery of enoxaparin to decrease restenosis after stenting: results of initial multicenter trial: Polish-American Local Lovenox NIR Assessment study (The POLONIA study).

BACKGROUND: Enoxaparin inhibits smooth muscle cell proliferation in experimental models. Intimal hyperplasia has been found to be the principal cause of restenosis after coronary stent implantation. We sought to determine whether the intramural delivery of enoxaparin before stenting of de novo lesions decreases restenosis. METHODS AND RESULTS: One hundred patients who were undergoing stenting were randomly assigned to either local administration of enoxaparin during predilation with reduced systemic heparinization or stenting with standard, systemic heparinization. All patients were treated with the same type of stent (NIR). The primary study end point was late luminal loss. The secondary end points were major adverse cardiac events, target lesion revascularization, and angiographic restenosis at 6 months. Angiographic follow-up at 6 months was completed in all except 1 patient. Late luminal loss was reduced to 0.76+/-0.42 mm in the local enoxaparin delivery group versus 1. 07+/-0.49 mm in the systemic heparinization group (P:<0.001). Restenosis, using a binary definition, occurred in 10% of patients in the enoxaparin group and in 24% of patients in the systemic heparinization group (P:<0.05). Target lesion revascularization rates occurred in 8% of the enoxaparin group and 22% of the systemic heparinization group (P:<0.05). There were no deaths and no emergent CABGs were performed. The only subacute stent closure and non-Q-wave infarction occurred in a patient assigned to the systemic heparinization group. CONCLUSIONS: This is the first prospective randomized trial in which the local delivery of a drug, enoxaparin, resulted in significant reduction in late luminal loss and restenosis after stent implantation in de novo coronary lesions.

Anticoagulants↗

Scatterplots of RR and RT interval variability bring evidence for diverse non-linear dynamics of heart rate and ventricular repolarization duration in coronary heart disease.

OBJECTIVE: QT interval prolongation and increased spatial QT dispersion are important factors increasing the risk in coronary heart disease. The authors studied the spontaneous beat-to-beat variability of ventricular repolarization (RT intervals) in normal subjects and in patients after myocardial infarction (MI) in order to define the determinants of abnormal temporal dispersion. METHODS: Seventy-six patients with a history of MI (17 female, 59 male, aged 52 +/- 10 years) comprised the study group. Forty-seven patients had preserved left ventricular ejection fraction (EF > or = 40%, MI-A) and 29 patients had left ventricular dysfunction (EF < 40%, MI-B). Twenty healthy volunteers (6 female, 14 male, aged 25 +/- 5 years) were included as the control group. An ECG signal of 512 heartbeats was recorded in the supine position. After analogue-to-digital conversion (16 bit, 2 kHz), the fiducial points of the R wave and T wave were determined. The RR and RT variability (V) assessed in the time domain as the standard deviations of RR and RT (ms), as well as the coefficients of scatterplots of RR and RT intervals. RESULTS: As expected, the standard deviation of RR was significantly reduced in MI patients. The magnitude of RTV in the time domain was similar in the controls and in both subgroups of MI patients. The complexity of heart rate variability (HRV) was slightly, but significantly, reduced in the MI-B group, but not significantly in the MI-A heart group. The complexity of RTV behaved in the opposite manner, being increased in both MI subgroups with the lower mean in the MI-B patients. The different behaviour of HRV and RTV was indicated by the increased ratio of RR/RT coefficients, which reached a significantly greater value in the MI-B group. CONCLUSION: The authors have described different patterns of scatterplot of short-term HRV and RTV in normal subjects, which confirmed that RTV is a less complex phenomenon than HRV. In patients after MI, the complexity of HRV diminishes, while the complexity of RTV increases. These opposing changes are more pronounced in patients with left ventricular dysfunction. A possible prognostic value of this feature is unknown and remains to be elucidated in future prospective studies.

Action Potentials↗

Efficacy and safety of dofetilide in the prevention of symptomatic episodes of paroxysmal supraventricular tachycardia: a 6-month double-blind comparison with propafenone and placebo.

BACKGROUND: Existing drug therapies for paroxysmal supraventricular tachycardia (PSVT) have potentially serious adverse effects. Dofetilide, a pure class III antiarrhythmic agent, may offer an effective and safe alternative for treating PSVT. This study compared the efficacy and safety of dofetilide with that of propafenone and placebo in the prevention of PSVT. METHODS: This multicenter, randomized, placebo-controlled, parallel-group study compared the effectiveness of oral dofetilide 500 microg given twice daily with that of propafenone 150 mg given 3 times a day and placebo in preventing the recurrence of PSVT in 122 symptomatic patients. Episodes of PSVT were documented by symptom diaries and Hertcard (Hertford Medical, Hertfordshire, UK) event recorders. RESULTS: After 6 months of treatment, patients taking dofetilide, propafenone, and placebo had a 50%, 54%, and 6% probability, respectively, of remaining free of episodes of PSVT (P <.001 for both dofetilide and propafenone vs placebo). Both dofetilide and propafenone also decreased the frequency of episodes of PSVT; the median numbers of episodes in the dofetilide- and propafenone-treated groups were 1 and 0.5, respectively, compared with 5 in the placebo-treated group. Dofetilide was well tolerated; no proarrhythmia occurred. Three patients taking propafenone had serious treatment-related adverse effects that required drug discontinuation. CONCLUSIONS: Dofetilide and propafenone were equally effective in preventing the recurrence of or decreasing the frequency of PSVT.

Administration, Oral↗

Overview of the results of recent beta blocker trials.

Results of the studies published or reported within the last 2 years provide convincing evidence that beta-blockers can decrease mortality in patients with chronic symptomatic heart failure because of left ventricular systolic dysfunction. The Cardiac Insufficiency Bisoprolol Study (CIBIS)-II and Metoprolol CR/XL Randomised Intervention Trial in Congestive Heart Failure (MERIT-HF) trials showed a 34% reduction in all-cause death with bisoprolol and metoprolol therapy in patients with class II-III heart failure. Data from Carvedilol Prospective Randomized Cumulative Survival (COPERNICUS), with a 35% mortality reduction, extended this benefit to class IV patients treated with carvedilol who do not require intravenous diuretics or positive inotropes. Ongoing beta-blocker studies address new topics, such as treatment of older patients, in whom diastolic heart failure may be more common, and direct comparison of different drugs. Although the use of beta-blockers for heart failure tends to increase, implementation of the knowledge from the trials in clinical practice still remains a challenge.

Adrenergic beta-Antagonists↗

[Prevalence of main risk factors for ischemic heart disease in a cohort of 41,972 participants from Southern Poland Epidemiological Survey].

Southern Poland Epidemiological Survey (SPES) was carried out in 1997 in the former Katowice and Bielsko voivodeships with the aim of cardiovascular disease prevention. One of the objectives of SPES was to establish the prevalence of the risk factors for atherosclerosis. This paper describes a group of 41,927 adults (24,985 women and 16,942 men) with no signs and symptoms of ischaemic heart disease who participated in the study, comprising 83.7% of all the examined cohort. Hypercholesterolemia and hypertension, present in 55.8% and 45.3% of subjects respectively, were found to be the main risk factors in both men and women. Hypercholesterolemia was more prevalent in older age groups. 33.7% of women and 46.3% of men were overweight, 23.9% and 17% respectively were obese. 22.4% of women and 31.9% of men were active smokers. Smoking was more common in younger age groups. 25.3% of women and 21.5% of men had a positive family history for ischaemic heart disease before the age of 60 years. High prevalence of classical risk factors in the examined group indicates that population strategy should be introduced in primary prevention of cardiovascular disease in this area.

Adult↗

[Subjective quality of life in patients with coronary artery disease after percutaneous coronary angioplasty in elderly patients after 65 years of age].

UNLABELLED: The aim of our study was to determine the quality of life in elderly patients after PTCA using the SF 36 questionnaire measuring post procedural physical and mental health. STUDY GROUP: 71 pts > 65 years (M-46, F-25), mean age 70.92 +/- 3.49, post PTCA were examined with SF 36 questionnaire. CONTROL GROUP: 73 pts < 65 years (M-61, F-12) mean age 53.6 +/- 7.37, post PTCA. The mean follow-up time was 19.3 +/- 3.2 month in the study group and 18.8 +/- 8.5 month in the control group (NS). The mean physical component summary score was 67.2 vs 69.7 points (NS) in the control group. The mean mental component summary score was 72.3 vs 74.4 points (NS) respectively. There were no significant differences between the groups in the following multi item domains: general health, vitality, social functioning, emotional role functioning and mental health, except physical functioning: 73.5 vs 76.3 points, p < 0.008 respectively. Additional questions asked revealed high satisfaction with performed PTCA, similar in both groups: 65 pts (91.6%) vs 71 pts (98.6%) (NS). 70 (99%) elderly pts considered this method most valuable and would undergo this procedure eagerly again, if necessary. During the observation 21 (29.6%) elderly pts required hospitalization because of the chest pain, 2 pts (2.8%) had nonfatal myocardial infarction and 3 pts (4.2%) underwent surgical revascularisation (CABG). In the control group 12 pts (16.4%) were re-hospitalized, 1 pt (1.4%) required CABG and no acute cardiac events were observed. Smoking was continued significantly more frequently in the younger pts: 12 (16.4%) vs 2 (2.8%) p = 0.05. 72 (98.6%) younger pts and 60 (84.5%) elderly pts reported regular cholesterol level control (NS). Our data suggest that PTCA in elderly pts with symptomatic coronary artery disease, is well tolerated and reflects positively in their quality of life after the procedure.

Aged↗

Survival and prognosis: investigation of Crataegus extract WS 1442 in congestive heart failure (SPICE)--rationale, study design and study protocol.

UNLABELLED: SPICE is the first, international, randomized, placebo-controlled, double-blind study to investigate the influence of the herbal drug Crataegus Special Extract WS 1442 (hawthorn leaves with flowers) on mortality of patients suffering from congestive heart failure. BACKGROUND: In vitro and experimental animal studies have suggested the following pharmacological modes of action of standardized Crataegus extracts: (1) cAMP-independent positive inotropy; (2) peripheral and coronary vasodilation; (3) protection against ischemia-induced ventricular arrhythmias; (4) antioxidative properties; and (5) anti-inflammatory effects. STUDY DESIGN: In this randomized, placebo-controlled, double-blind, international trial (approximately 120 investigational centers in seven European countries), up to 2300 patients with congestive heart failure, New York Heart Association class II and III and markedly impaired left ventricular function, will be enrolled and treated over a period of 24 months. During this time patients receive either two film-coated tablets of 450 mg of the Special Extract WS 1442 standardized to 84.3 mg of oligomeric procyanidines or matched placebo per day in addition to standard therapy for congestive heart failure, such as diuretics, digoxin or digitoxin, beta-adrenoceptor blockers and angiotensin-converting-enzyme inhibitors. The primary outcome variable is the combined endpoint of cardiac death, non-lethal myocardial infarction, and hospitalization due to progression of heart failure. Secondary outcome variables are total mortality, exercise duration, echocardiographic parameters, quality of life as well as pharmacoeconomic parameters. The first patient was included in October 1998. The trial is expected to be completed at the end of 2002.

Adult↗

[Genetic changes and clinical management in familial hypertrophic cardiomyopathy].

Hypertrophic cardiomyopathy (HCM) is phenotypically and genotypically heterogeneous disease of heart. Nine chromosomal loci responsible for this condition have been identified: beta-myosin heavy chain, essential and regulatory myosin light chains, troponin T and I subunits, alpha-tropomosin, cardiac myosin binding protein C, cardiac actin and titin. These genes code for proteins involved in the contraction mechanism or in the control of contraction, therefore HCM has been classified as a disease of cardiac sarcomere. Over 107 mutations have been identified. More then half of them have been detected in the beta-myosin heavy chain gene (beta-MHC). Some mutations in beta-MHC gene are associated with a benign prognosis, other are associated with high incidence of sudden cardiac death (SCD) and severe hypertrophy. Mutations in myosin binding protein C are associated with mild, delayed expression of cardiac hypertrophy and benign prognosis. Mutations in cardiac troponinT are associated with a mild degree of hypertrophy but a high incidence of SCD. Study of genes responsible for HCM will assume role in the context of clinical management of HCM, in particular regarding diagnosis and prognosis patients and families with HCM.

Cardiomyopathy, Hypertrophic↗

[Long-term observation of exercise capacity and left ventricular function in patients with coronary heart disease treated surgically and conservatively].

[1] CASS Principal Investigators and their Associates.: Coronary Artery Surgery Study (CASS): a randomized trial of coronary artery bypass surgery. Survival data. Circulation 1983; 68: 951-960. [2] Danchin N i wsp. Effect of late percutaneous angioplastic recanalization of total coronary artery occlusion on left ventricular remodeling, ejection fraction, and regional wall motion. Am J Cardiol 1996; 78: 729-735. [3] Dilsizian V i wsp.: Enhanced regional left ventricular function after distant coronary bypass by means of improved collateral blood flow. J Am Coll Cardiol 1989; 14: 312-318. [4] European Coronary Surgery Study Group.: Long-term results of prospective randomized study of coronary artery bypass surgery in stable angina pectoris. Lancet 1982; 27: 1173-1183. [5] Frick MH, Harjola PT, Valle M. Persistent improvement after coronary bypass surgery: ergometric and angiographic correlations at 5-years. Circulation 1983; 67: 491-496. [6] Gasior Z i wsp. Chirurgiczna rewaskularyzacja mieśnia serca a funkcja skurczowa lewej komory. Kardiol Pol 1997; 46: 200-211. [7] Hirnle T i wsp.: Badanie histologiczne wycinków tetnicy piersiowej wewnetrznej, zyły odpiszczelowej wielkiej i aorty pobranych w czasie operacji kardiochirurgicznych. Kardiol Pol 1991; 34: 155-159. [8] Hultgren HN i wsp.: The 5 year effect of bypass on relief of angina and exercise performance. Circulation 1985; 72: (suppl V) 79-89. [9] Kmieć G, Zwirski W, Moczurad K. Ocena odległych wyników leczenia operacyjnego choroby niedokrwiennej serca w oparciu o testy wysiłkowe, badanie polikardiograficzne oraz powrót do pracy zawodowej. Kardiol Pol 1990; 3: 179-183. [10] The Veterans Administration Coronary Artery Bypass Surgery Cooperative Study Group.: Eleven-year survival in the Veterans Administration randomized trial of coronary bypass surgery for stable angina. N Engl J Med 1984; 311: 1333-1339.

Adult↗

[Normalization of lipid metabolism disturbances and clinical course after percutaneous coronary angioplasty: 6 month observation].

UNLABELLED: The recurrent stenosis of previously successfully dilated coronary arteries still remains a matter of concern despite of the improved short and long term results of percutaneous coronary angioplasty. The role of dyslipidaemia in the origin of restenosis after coronary angioplasty is still controversial. The aim of our study was to evaluate the efficacy of hypolipemic treatment in patients undergoing coronary angioplasty and to find out whether successful lowering of lipid parameters to normal limits is related to improvement exercise capacity and systolic function of left ventricle. The study group comprised 152 patients (17 women, 135 men), aged 52 +/- 8.8 years, who were reffered for percutaneous coronary angioplasty (PTCA). The patients were divided, according to the ratio of total cholesterol to HDL cholesterol (CH/ch-HDL), into two subgroups: subgroup I with CH/ch-HDL > 5.0 and subgroup II with CH/ch-HDL < or = 5.0. In all patients following parameters: total cholesterol, HDL cholesterol, LDL cholesterol, triglycerides and body mass index were measured before PTCA, 1 month and 6 months after the procedure. At the same times a treadmill test and echocardiography were performed. Baseline total cholesterol, HDL cholesterol and triglycerides were significantly higher in subgroup I. In subgroup I Ch/ch-HDL ratio was at baseline 7.4 +/- 2.0 and decreased 6 months after PTCA to 5.2 +/- 1.7, p < 0.001. The CH/ch-HDL ratio was 4.2 +/- 0.6 in subgroup II before PTCA and remained the same 4.1 +/- 1.2 after 6 months. Before PTCA, the exercise capacity did not differ between groups 9.1 +/- 2.5 vs 9.6 +/- 3.3 MET, p = ns. A significant improvement of exercise capacity was observed in subgroup I 1 month after PTCA 9.1 +/- 2.5 to 11.2 +/- 2.7 MET, p < 0.001, remaining at the same level after 6 months. The differences seen in group II did not reach the statistical significance. Echocardiography revealed improvement of left ventricle contractility in both subgroups, with statistically significant increase in group I (1.24 +/- 0.36 to 1.14 +/- 0.27, p < 0.001). The left ventricle systolic function was within normal limits in all patients before coronary angioplasty and increased significantly 1 month after PTCA in subgroup I (56.1 to 60.4%, p < 0.001). 6 months after PTCA no further significant changes were observed. CONCLUSIONS: The dyslipidaemic state recognised before PTCA does not influence clinical outcomes after the procedure. Lipid lowering therapy should be offered to every patient undergoing coronary angioplasty regardless of the baseline value of total cholesterol to HDL cholesterol ratio. Optimal treatment of dyslipidaemia leading to lower total cholesterol, triglycerides and total cholesterol to HDL cholesterol ratio, to normal limits, is associated with improved exercise capacity and systolic function of left ventricle six months after successful coronary angioplasty.

Adult↗

Single-bolus tenecteplase compared with front-loaded alteplase in acute myocardial infarction: the ASSENT-2 double-blind randomised trial.

BACKGROUND: Bolus fibrinolytic therapy facilitates early efficient institution of reperfusion therapy. Tenecteplase is a genetically engineered variant of alteplase with slower plasma clearance, better fibrin specificity, and high resistance to plasminogen-activator inhibitor-1. We did a double-blind, randomised, controlled trial to assess the efficacy and safety of tenecteplase compared with alteplase. METHODS: In 1021 hospitals, we randomly assigned 16,949 patients with acute myocardial infarction of less than 6 h duration rapid infusion of alteplase (< or = 100 mg) or single-bolus injection of tenecteplase (30-50 mg according to bodyweight). All patients received aspirin and heparin (target activated partial thromboplastin time 50-75 s). The primary outcome was equivalence in all-cause mortality at 30 days. FINDINGS: Covariate-adjusted 30-day mortality rates were almost identical for the two groups--6.18% for tenecteplase and 6.15% for alteplase. The 95% one-sided upper boundaries of the absolute and relative differences in 30-day mortality were 0.61% and 10.00%, respectively, which met the prespecified criteria of equivalence (1% absolute or 14% relative difference in 30-day mortality, whichever difference proved smaller). Rates of intracranial haemorrhage were similar (0.93% for tenecteplase and 0.94% for alteplase), but fewer non-cerebral bleeding complications (26.43 vs 28.95%, p=0.0003) and less need for blood transfusion (4.25 vs 5.49%, p=0.0002) were seen with tenecteplase. The rate of death or non-fatal stroke at 30 days was 7.11% with tenecteplase and 7.04% with alteplase (relative risk 1.01 [95% CI 0.91-1.13]). INTERPRETATION: Tenecteplase and alteplase were equivalent for 30-day mortality. The ease of administration of tenecteplase may facilitate more rapid treatment in and out of hospital.

Aged↗

Perindopril for elderly people with chronic heart failure: the PEP-CHF study. The PEP investigators.

BACKGROUND: The prevalence of chronic heart failure (CHF) rises with increasing age, from < 1% in those below 65 years of age to > 5% in those over 65 years of age and is a major cause of morbidity and mortality in older people. Recent European guidelines point to a major deficiency in our knowledge of how to treat diastolic chronic heart failure, and a lack of information on treatment for heart failure in the elderly in general. AIMS: The aims of this trial are to assess the potential benefits of the ACE inhibitor perindopril to treat chronic heart failure in elderly people, in the absence of any major left ventricular systolic dysfunction. SUBJECTS: One thousand people over the age of 70 years will be recruited into this study. Evidence of chronic heart failure will be confirmed by clinical criteria and echocardiography. METHODS: Once a diagnosis of chronic heart failure has been confirmed, the patient will receive either perindopril or placebo in addition to their usual treatment. Death, and unplanned heart failure related hospitalisations, are the primary outcomes. Quality of life, as measured by the Guyatt questionnaire will be assessed at the beginning of the study and at 1 year. Sub-studies of this trial include a 6-min walking test and more detailed evaluation of ventricular function (as assessed by echocardiography). Both parameters will be measured at 8 weeks and 1 year, and analysed against baseline data. Cognitive function in this group of patients will also be evaluated at baseline and 1 year. This trial is due to report in the year 2001.

Aged↗