Gene/Protein Disease Symptom Drug Enzyme Compound
Pivot Concepts:   Target Concepts:
Query: UMLS:C0038454 (stroke)
 147,016 document(s) hit in 31,850,051 MEDLINE articles (0.00 seconds)

The importance of the thrombotic component of coronary heart disease is increasingly recognised, and in particular the role of the coagulation system in this process. The Northwick Park Heart study was the first major prospective study to identify both fibrinogen and factor VIIc as risk factors, as powerful as total cholesterol in predicting ischaemic events. Since then, a number of epidemiological studies have confirmed the importance of fibrinogen, not just in CHD but in stroke as well. A variety of environmental factors are known to influence levels of factor VII and fibrinogen and therefore support their role in the development of coronary thrombosis. Both are known to increase with age and body weight and are relatively elevated in diabetes. Fibrinogen is strongly related to smoking habit and a substantial proportion of the IHD risk associated with smoking is mediated through this relationship. There is a dose response effect between number of cigarettes smoked and level of fibrinogen and an inverse relationship with time since cessation of the habit. Factor VII is known to correlate with total cholesterol level, and there is a relationship between dietary variability of fat intake and factor VII, which is likely to play an important role in the risk of CHD. The case for using either anticoagulation or anti platelet agents in secondary prevention of myocardial infarction is now clear, but there are still uncertainties in primary prevention which relate to the ideal dose intensity of either aspirin or anti-coagulation and the type of patient most likely to benefit. The ongoing Thrombosis Prevention Trial identifies middle-aged males at high risk of a myocardial infarction.(ABSTRACT TRUNCATED AT 250 WORDS)
 ...
PMID:Plasma fibrinogen and factor VII as risk factors for cardiovascular disease. 150 57

Epidemiological observations indicate that high plasma fibrinogen levels are strongly correlated to the frequency of two major thrombotic complications of atherosclerosis: stroke and myocardial infarction. Thrombosis is increasingly recognized as a central mechanism in stroke and myocardial infarction, and fibrinogen is involved in events thought to play a major role in thrombosis. Therefore, elucidation of the relationship between fibrinogen and thrombosis may strengthen the predictive value of this protein and define new interventions against stroke and myocardial infarction. In addition, advances in the understanding of the atherogenic potential of several risk factors of coronary heart disease took advantage of information emerging from the measurement of the factor in population-based studies. Thus, it is conceivable that measuring plasma fibrinogen to predict stroke and myocardial infarction is a major direction to be followed to gain insight into the thrombogenic potential on this protein and inspire new strategies against thrombotic complications of atherosclerosis.
 ...
PMID:Fibrinogen and mechanisms of thrombosis. A difficult link. 150 58

Some papers report that the effect of heparin-mediated extracorporeal LDL less than cholesterol, LP(a), triglycerides, fibrinogen greater than precipitation (H.E.L.P.) in cardiovascular disease may results from an influence on the above-mentioned parameters. Hence, this method has been applied in multi-infarct dementia (MID), where fibrinogen, whole blood and plasma viscosity and red cell transit time (RCTT) are increased. The selection of patients was based on DMS-3, on NINCDS/ADRDA criteria and on the Hachinski Ischemic Stroke Scale. All the patients (n = 14) were examined magnet resonance imaging. Fibrinogen, cholesterol, LDL-cholesterol, HDL-cholesterol, LP(a), RCTT and plasma and whole blood viscosity were determined prior to, and after each two H.E.L.P. procedures. Fibrinogen was lowered (in a comparison of the data prior to the first and following the second plasmapheresis) from 526.4 +/- 114 to 314.1 +/- 80.1 mg/dl (p less than 0.01), cholesterol from 210.8 +/- 76.8 to 131.3 +/- 38.2 mg/dl (p less than 0.01), LDL from 125 +/- 53 mg/dl to 63.6 +/- 25.7 mg/dl (p less than 0.01), LP(a) from 26.2 +/- 13.2 to 12.0 +/- 9.5 mg/dl (p less than 0.01), HDL from 31.7 +/- 6.3 to 29.7 +/- 5.6 mg/dl (no significance), RCTT from 14.4 +/- 2.8 to 10.9 +/- 0.9 (p less than 0.01), whole blood viscosity (low shear rate) from 11.64 +/- 1.7 to 8.74 +/- 1.4 mPa/sec (p less than 0.01) and (high shear rate) from 5.38 +/- 0.58 to 4.28 +/- 0.83 mPa/sec (p less than 0.01). Plasma viscosity decreased from 1.51 +/- 0.12 mPa/sec to 1.25 +/- 0.1 mPa/sec (p less than 0.05). In cases of MID the implementation of H.E.L.P. therefore enabled an alteration of the hemorheological profile which has so far not been achieved by any hemorheologically active substance to a comparable degree and in comparable time.
 ...
PMID:[Hemorheology and H.E.L.P. in multi-infarct dementia]. 153 54

To assess the incidence, risk factors, and clinical importance of deep vein thrombosis in acute stroke, we studied 70 consecutive patients who underwent hemostasis screening at the time of entry into the study and followed up these patients with serial venous Doppler examinations and the iodine 125-labeled fibrinogen uptake test. Mortality was significantly higher among the 20 patients who developed a deep vein thrombosis, and eight of them had necropsy evidence of pulmonary embolism. Severity of leg paresis and a shortened activated partial thromboplastin time were significantly associated with subsequent deep vein thrombosis with multivariate analysis. Significantly higher levels of fibrinopeptide A were found in patients with postmortem evidence of pulmonary embolism. Deep vein thrombosis is a frequent complication of acute stroke and may influence the prognosis by inducing pulmonary embolism. Our findings allow rapid identification of high-risk patients who may benefit maximally from prophylactic treatment of venous thromboembolism.
 ...
PMID:Venous thromboembolism in acute stroke. Prognostic importance of hypercoagulability. 153 31

The physiology of the blood and the vascular system suggest that the rheological properties of blood gain in importance as arteriosclerotic vascular changes progress. Thus, for example, in arterial segments distal to a stenosis, a decrease in perfusion pressure (in the nutritive vessels) occurs--a situation that is probably of causative relevance in a considerable percentage of patients with apoplexy. An increasing number of studies seem to indicate that blood and plasma viscosity, red cell aggregation and fibrinogen levels in these patients reveal significant pathological changes, and may well be of prognostic significance. It may be speculated that routine monitoring of these and possible other rheologically important parameters in patients with a relevant risk together with suitable treatment may contribute to more effective primary and secondary prevention of cerebrovascular diseases, in particular ischemic insults.
 ...
PMID:[Hemorheology and stroke]. 155 43

Current knowledge indicates that high plasma levels of fibrinogen help predict stroke and myocardial infarction. It is known that plasma fibrinogen is synthesized in the liver, that interleukin-6 (IL-6) affects this synthesis, and that, when exposed to appropriate stimuli, monocytes generate a variety of monokines, including IL-6. It is also known that prolonged administration of N-3 fatty acids, ticlopidine, fibrates, pentoxifylline, or alcohol lower plasma fibrinogen levels. The mechanism(s) involved in this effect are poorly understood. However, in view of the role of IL-6 and monocytes in the regulation of plasma fibrinogen levels, it is conceivable that the lowering effect of these drugs involves effects on some steps of the regulatory machinery. In addition to fibrinogen, IL-6 regulates the synthesis of other acute-phase proteins. This raises the question of whether high plasma fibrinogen levels do reflect the response of an acute-phase reactant to the severity of the atherosclerotic vascular damage taking place. Current evidence is inconclusive with respect to this possibility. On the other hand, the epidemiological data available indicate that measurements of plasma fibrinogen should be included in the cardiovascular risk-factor profile. In view of this, we believe that information emerging from population-based studies in which plasma fibrinogen is measured is important to identify appropriate directions to be followed to address unsolved issues in the area.
 ...
PMID:Drugs affecting plasma fibrinogen levels. 157 94

Moderate hyperhomocysteinaemia is a frequent finding in atherothrombotic cerebrovascular disease. This study confirms and extends this observation. Hyperhomocysteinaemia was present in 57 of 142 survivors with stroke (40%) and in four of 66 controls (6%). Plasma homocysteine concentrations were increased not only in carotid artery disease or lucunar stroke but also in haemorrhagic or embolic strokes. Homocysteine values were unrelated to the presence of hypertension, smoking, or hypercholesterolaemia, or to the concentrations of blood glucose, glycosylated haemoglobin, and plasma fibrinogen. Multiple regression analysis of the patient data showed that about 40% of the variation in plasma homocysteine concentrations could be predicted by the values for the homocysteine metabolism cofactors, blood folate and plasma pyridoxal 5-phosphate and by renal function as reflected in the values for serum creatinine. In patients, urine excretion of homocysteine per unit creatinine was significantly increased and strongly correlated both to the plasma homocysteine concentration and to the values for blood folate, plasma pyridoxal 5-phosphate, and serum vitamin B12. We conclude that moderate hyperhomocysteinaemia is frequently present in cases of stroke, is independent of other stroke risk factors or the type of stroke, and is partly related to renal function and the concentrations of homocysteine metabolism cofactors.
 ...
PMID:Hyperhomocysteinaemia in stroke: prevalence, cause, and relationships to type of stroke and stroke risk factors. 158 47

Researchers have found that oral contraceptives (OCs) change carbohydrate and lipoprotein metabolism and these changes are like those linked with increased risk of cardiovascular (CV) disease, especially myocardial infarction and stroke. Since CV disease is the major cause of death in US women, it is important that OCs not induce changes in carbohydrate and lipoprotein metabolism. A new progestin, norgestimate, has an advantage over other progestins in that it tends not to induce male traits. This is beneficial because androgenicity is related to atherosclerosis which increases the risk of myocardial infarction. Further studies show that the new combined OC (250 mcg norgestimate/35 mcg ethinyl estradiol) does not influence serum glucose tolerance levels. It also does not affect the physiologic regulating system of prostacyclin, the inhibitor of platelet aggregation, by high density lipoprotein (HDL). In addition, it increases prostacyclin metabolites and HDL which may indeed decrease the risk of occlusive thrombotic vascular diseases. Moreover a study in Germany demonstrates that it causes no changes in fibrinopeptide A,m the anticoagulation factors antithrombin III and protein C, or coagulation promoting factors fibrinogen, factor VII, and the components of VIII. In women, it is absorbed well and metabolized extensively before the body eliminates it. Moreover this new combined OC has an overall Pearl index of 0.25. Studies to data indicate that norgestimate/ethinyl estradiol may be more advantageous than other OC formulations. Yet only long term epidemiologic studies can determine if it can indeed decrease the risk of CV diseases linked with older OCs.
 ...
PMID:Norgestimate: a clinical overview of a new progestin. 160 87

In view of reported associations between increased bleeding tendency and systemically decreased alpha 2-antiplasmin in patients with systemic amyloid deposition we studied alpha 2-antiplasmin, fibrinogen, C-reactive protein and blood levels of locally produced endothelial hemostasis factors in the acute and quiescent phase in 16 patients with hereditary cerebral hemorrhage with amyloidosis-Dutch type (HCHWA-D). None of the factors measured in the quiescent phase of the disease was abnormal. In the acute phase, shortly after a stroke, only factor VIII:Ag was evidently elevated. We concluded that systemic abnormalities in the part of the fibrinolysis system studied are not likely to be responsible for multifocal and recurrent cerebral hemorrhages in HCHWA-D. The role of an elevated factor VIII:Ag level in the acute phase is unclear.
 ...
PMID:Hereditary cerebral hemorrhage with amyloidosis-Dutch type: a study of fibrinolysis. 161 71

Conventional risk factors predict only about 30-50% of incidental cases in cardiovascular diseases, which are still the leading cause of death in western societies. During the last decade, the importance of thrombosis as an essential mechanism in acute myocardial infarction (AMI) and stroke has been established. The introduction of thrombolysis has led to an impressive reduction in AMI case fatality and possibly also to a substantial amelioration of its prognosis. Evidence from experimental, clinical and epidemiological studies suggest, that several hemostatic and hemorheological factors (e.g., fibrinogen, Factor VII, plasma viscosity, hematocrit, red blood cell aggregation, total white cell count) might not only play an important role in the evolution of acute thrombotic events, but may also take part in the pathophysiology of atherosclerosis. An increasing number of studies reports altered hemostatic and hemorheological parameters to be associated with smoking, hyperlipoproteinemia, and high blood pressure, as well as with adverse dietary habits and other life-style factors. To date, their way of interaction with the atherosclerotic process is poorly understood. Hemorheological or hemostatic mechanisms that might promote thromboatherogenesis include the predisposition to thrombosis via a hypercoagulable state, the enhancement of atherosclerosis by fibrinogen and its metabolites, and finally the reduction of blood flow through various rheological effects (e.g., increase in plasma viscosity and red cell aggregation, or leukocyte activation). Future research should focus in more detail on the interrelationship between accepted risk factors and the hemostatic system as well as hemorheological parameters. Deeper insight into the mechanisms involved might lead to new preventive strategies as well as to therapeutic procedures in the management of atherosclerosis and associated thrombotic events.
 ...
PMID:The possible role of hemorheology in atherothrombogenesis. 163 76


<< Previous 1 2 3 4 5 6 7 8 9 10 Next >>