Abstract:
:The flow pattern and the paths of fluid particles in a saccular aneurysm located at the bifurcation of an intracranial arterial segment are investigated with a numerical method. A normal physiological flow pattern was assumed as input to the studied segment. The theoretical study is carried out for two different Reynolds numbers and two different geometries of the aneurysm. The governing equations for incompressible Newtonian fluid flow are solved using the finite element method. The results show the disturbed blood flow in the pathologically altered bifurcation and the flow activity in the aneurysms. It is particularly important that blood particles can circulate in a whirl within the aneurysm for a time which seems long enough to permit the generation of cell aggregates or/and blood clots.
journal_name
Basic Res Cardioljournal_title
Basic research in cardiologyauthors
Perktold K,Kenner T,Hilbert D,Spork B,Florian Hdoi
10.1007/BF01907101subject
Has Abstractpub_date
1988-01-01 00:00:00pages
24-31issue
1eissn
0300-8428issn
1435-1803journal_volume
83pub_type
杂志文章abstract::Successive ischemic episodes are commonly seen in clinical and experimental cardiology. Although prolonged abnormalities of the canine myocardium have been described following a single ischemic episode, it is not known whether myocardial injury is cumulative following multiple ischemic episodes. Dogs were subjected to...
journal_title:Basic research in cardiology
pub_type: 杂志文章
doi:10.1007/BF01908148
更新日期:1984-07-01 00:00:00
abstract::To determine the effect of magnesium on myocardial function and oxidative metabolism after reperfusion, isolated rat hearts perfused retrogradely with erythrocyte-enriched medium (0.4 mM palmitate bound to 0.4 mM albumin, 11 mM glucose) were subjected to 60 minutes of no-flow ischemia followed by 60 minutes of reperfu...
journal_title:Basic research in cardiology
pub_type: 杂志文章
doi:10.1007/BF00795204
更新日期:1994-07-01 00:00:00
abstract::Hearts preconditioned by brief ischemia are characterized by a reduced rate of cellular purine metabolite production during subsequent prolonged ischemia; the purpose of this study was to determine if transient exogenous adenosine pretreatment can mimic this phenomenon. The accumulation of interstitial fluid (ISF) pur...
journal_title:Basic research in cardiology
pub_type: 杂志文章
doi:10.1007/BF00796210
更新日期:1997-12-01 00:00:00
abstract::We studied TTX-sensitive Na channels in dissociated single ventricular cells from neonatal rats using the patch clamp method for single channel and whole cell recording. In both cases, slowly inactivating or window currents were observed that decayed in a biexponential fashion. Customary models of Na current kinetics ...
journal_title:Basic research in cardiology
pub_type: 杂志文章
doi:
更新日期:1985-01-01 00:00:00
abstract::Cardiac disease is associated with deleterious emission of mitochondrial reactive oxygen species (mito-ROS), as well as enhanced oxidation and activity of the sarcoplasmic reticulum (SR) Ca2+ release channel, the ryanodine receptor (RyR2). The transfer of Ca2+ from the SR via RyR2 to mitochondria is thought to play a ...
journal_title:Basic research in cardiology
pub_type: 杂志文章
doi:10.1007/s00395-020-0797-z
更新日期:2020-05-22 00:00:00
abstract::The sympathetic and parasympathetic nervous system play a powerful role in controlling cardiac function by activating adrenergic and muscarinic receptors. In the human heart there exist alpha1-, beta1- and beta2-adrenoceptors and M2-muscarinic receptors and possibly also (prejunctional) alpha2-adrenoceptors. Beta1- an...
journal_title:Basic research in cardiology
pub_type: 杂志文章,评审
doi:10.1007/s003950170003
更新日期:2001-11-01 00:00:00
abstract::A new experimental in-vitro model is described, which was used for studying prostacyclin (PGI2)-thromboxane A2 (TXA2)-interactions. Langendorff hearts of guinea pigs are perfused at constant volume with Krebs-Henseleit buffer and washed human platelets (4 x 10(8)/min). PGI2 and TXA2 release are measured by bioassay. T...
journal_title:Basic research in cardiology
pub_type: 杂志文章
doi:10.1007/BF01908344
更新日期:1981-09-01 00:00:00
abstract::It was previously reported that inhibition of carnitine synthesis by 3-(2,2,2-trimethyl-hydrazinium) propionate (MET-88) restores left ventricular (LV) systolic and diastolic function in rats with myocardial infarction (MI). Preservation of the calcium uptake function of sarcoplasmic reticulum Ca2+-ATPase (SERCA2) is ...
journal_title:Basic research in cardiology
pub_type: 杂志文章
doi:10.1007/s003950070032
更新日期:2000-10-01 00:00:00
abstract::A canine model for a standardized induction of collaterals is presented with a fixed external constrictor that is not designed to induce an occlusion of the coronary artery and at least over the timespan of 6 weeks does not impair perfusion under resting conditions in the myocardium-at-risk. The coronary constriction ...
journal_title:Basic research in cardiology
pub_type: 杂志文章
doi:10.1007/BF01906671
更新日期:1983-03-01 00:00:00
abstract::Mesenchymal stromal cells (MSCs) exhibit antiapoptotic and proangiogenic functions in models of myocardial infarction which may be mediated by secreted small extracellular vesicles (sEVs). However, MSCs have frequently been harvested from aged or diseased patients, while the isolated sEVs often contain high levels of ...
journal_title:Basic research in cardiology
pub_type: 杂志文章
doi:10.1007/s00395-020-0785-3
更新日期:2020-03-07 00:00:00
abstract::The purpose of this study was to determine the effect of acute and chronic propranolol on heart size and regional O2 supply/consumption variables in thyroxine (T4)-treated rabbit hearts. New Zealand white rabbits were given 0.5 mg/kg T4 for 3 or 16 days with and without concomitant 2 mg/kg propranolol. Another group w...
journal_title:Basic research in cardiology
pub_type: 杂志文章
doi:10.1007/BF01907360
更新日期:1988-05-01 00:00:00
abstract::The purpose of this study was to obtain more information about the role of the plasma membrane in cellular uptake of tracers used in myocardial scintigraphy (radioactive thallium chloride and palmitic acid). This knowledge is of importance for an adequate interpretation of the results obtained under clinical condition...
journal_title:Basic research in cardiology
pub_type: 杂志文章
doi:10.1007/978-3-662-11041-6_12
更新日期:1985-01-01 00:00:00
abstract:OBJECTIVE:Cardiac stunning is the consequence of a brief cardiac ischemia. The underlying mechanism is not completely understood. METHODS:Here we induced cardiac transient ischemia in conscious instrumented dogs by means of an occluder in the left anterior descending coronary artery (LAD). Contractile performance, mon...
journal_title:Basic research in cardiology
pub_type: 杂志文章
doi:10.1007/s00395-005-0577-9
更新日期:2006-05-01 00:00:00
abstract::In Langendorff-perfused guinea pig hearts, local myocardial perfusion was evaluated by analysis of FITC-dextran-150 elution kinetics after bolus injection. Locally estimated half-times of the monoexponential elution curves showed good correlation with global undisturbed coronary flow. After ligation of the left anteri...
journal_title:Basic research in cardiology
pub_type: 杂志文章
doi:10.1007/BF01935807
更新日期:1984-01-01 00:00:00
abstract::The aim of this study was to clarify the role of altered diabetic vascular reactivity in ischaemic heart disease. In diabetic condition, the necrotic area of myocardial infarction was significantly extended and myocardial oedema failed to develop after administration of norepinephrine 2 or 48 hours after ligation of t...
journal_title:Basic research in cardiology
pub_type: 杂志文章
doi:10.1007/BF01907942
更新日期:1982-09-01 00:00:00
abstract::In this report, we showed that a previous enterovirus exposure in ordinary mice with normal T cell function, but not in T cell-deficient mice, can influence development of myocardial inflammation with a second virus exposure. Inoculation of 4-week-old male BALB/c-nu/+ (euthymic and normal T cell function) mice with am...
journal_title:Basic research in cardiology
pub_type: 杂志文章
doi:10.1007/s003950170025
更新日期:2001-09-01 00:00:00
abstract::Ischemic heart disease is the main cause of death worldwide and is accelerated by increased levels of low-density lipoprotein cholesterol (LDL-C). Proprotein convertase subtilisin/kexin type 9 (PCSK9) is a potent circulating regulator of LDL-C through its ability to induce degradation of the LDL receptor (LDLR) in the...
journal_title:Basic research in cardiology
pub_type: 杂志文章,评审
doi:10.1007/s00395-017-0619-0
更新日期:2017-05-01 00:00:00
abstract::In open-chest pigs during severe myocardial ischemia [K+]e, [Ca2+]e and [H+]e increase, [Na+]e increases transiently reaching control values after 30 min. Extracellular osmolality of the ischemic area increases due to an H2O-shift from the ECS to the ICS. The increase of [Na+]e and [Ca2+]e must b explained by the shri...
journal_title:Basic research in cardiology
pub_type: 杂志文章
doi:10.1007/BF01908341
更新日期:1981-07-01 00:00:00
abstract::The characterization of various ion transport systems has led to a better understanding of the effects, which seem to take part in the impairment of ischemic and reperfused cardiac tissue. This review discusses the role of the Na+/H+ exchange system in the pathophysiology of ischemia and reperfusion and the beneficial...
journal_title:Basic research in cardiology
pub_type: 杂志文章,评审
doi:10.1007/BF00795411
更新日期:1993-09-01 00:00:00
abstract::From January 2020, coronavirus disease (COVID-19) originated in China has spread around the world. The disease is caused by the severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2). The presence of myocarditis, cardiac arrest, and acute heart failure in COVID-19 patients suggests the existence of a relationshi...
journal_title:Basic research in cardiology
pub_type: 社论
doi:10.1007/s00395-020-0791-5
更新日期:2020-04-09 00:00:00
abstract::The isolated working rabbit heart preparation was used to study whether the "contractile machinery" remains unchanged in globally stunned myocardium. The function of the heart has been measured in nonischemic and postischemic conditions. The effect of isoprenaline or calcium chloride administration in both conditions ...
journal_title:Basic research in cardiology
pub_type: 杂志文章
doi:10.1007/BF02190601
更新日期:1991-05-01 00:00:00
abstract::Beta-blockers have been shown to reduce the risk of coronary events and reduce the mortality of patients with hypertension and in those who have had a myocardial infarction. Furthermore, the evidence for long-term benefits in these two patient groups are much more convincing for beta-blockers than for other therapeuti...
journal_title:Basic research in cardiology
pub_type: 杂志文章,评审
doi:10.1007/s003950070006
更新日期:2000-01-01 00:00:00
abstract::DNA-dependent protein kinase catalytic subunit (DNA-PKcs) is a novel inducer to promote mitochondrial apoptosis and suppress tumor growth in a variety of cells although its role in cardiovascular diseases remains obscure. This study was designed to examine the role of DNA-PKcs in cardiac ischemia reperfusion (IR) inju...
journal_title:Basic research in cardiology
pub_type: 杂志文章
doi:10.1007/s00395-019-0773-7
更新日期:2020-01-09 00:00:00
abstract::The influence of cardiac cholinergic activation was studied in rats and cats on the induction and maintenance of ventricular fibrillation (VF). Acetylcholine (ACH 2-25 micrograms/kg), in doses which did not cause bradycardia or hypotension, induced appearance of spontaneous VF (duration 2-60 sec.) in 9/20 rats which h...
journal_title:Basic research in cardiology
pub_type: 杂志文章
doi:10.1007/BF01908386
更新日期:1984-11-01 00:00:00
abstract::The genetic defect in the cardiomyopathic (CM) hamster is a mutation in the glycoprotein-sarcoglycan (a component of the dystrophin-glycoprotein complex). Apoptosis has been identified in skeletal muscle of dystrophin-deficient mice, and therefore the role of myocardial apoptosis in relation to oncosis in causing myoc...
journal_title:Basic research in cardiology
pub_type: 杂志文章
doi:10.1007/s395-002-8389-4
更新日期:2002-01-01 00:00:00
abstract::In the human ventricle two isoforms of the phosphorylatable myosin light chain (MPLC) are expressed. These two forms are designated with increasing acidity as LC-2 and LC-2*. In the normal human heart the relation between LC-2/LC-2*-expression is 70/30, suggesting the existence of three different myosin isoenzymes (MP...
journal_title:Basic research in cardiology
pub_type: 杂志文章
doi:10.1007/978-3-642-72474-9_11
更新日期:1992-01-01 00:00:00
abstract::Autologous bone marrow mononuclear cell (BM-MNC) therapy for patients with ST-segment elevation myocardial infarction (STEMI) has produced inconsistent results, possibly due to BM-MNC product heterogeneity. Patient-specific cardiovascular risk factors (CRFs) may contribute to variations in BM-MNC composition. We sough...
journal_title:Basic research in cardiology
pub_type: 杂志文章
doi:10.1007/s00395-016-0592-z
更新日期:2017-01-01 00:00:00
abstract::K201 has previously been shown to reduce diastolic contractions in vivo during β-adrenergic stimulation and elevated extracellular calcium concentration ([Ca(2+)](o)). The present study characterised the effect of K201 on electrically stimulated and spontaneous diastolic sarcoplasmic reticulum (SR)-mediated Ca(2+) rel...
journal_title:Basic research in cardiology
pub_type: 杂志文章
doi:10.1007/s00395-011-0218-4
更新日期:2011-11-01 00:00:00
abstract::Although epicardial blood flow can be restored by an early intervention in most cases, a lack of adequate reperfusion at the microvascular level is often a limiting prognostic factor of acute myocardial infarction (AMI). Our group has recently found that paracrine factors secreted from apoptotic peripheral blood monon...
journal_title:Basic research in cardiology
pub_type: 杂志文章
doi:10.1007/s00395-012-0292-2
更新日期:2012-09-01 00:00:00
abstract::Dietary intake of unsaturated fatty acid of eicosapentaenoic acid (EPA) is thought to reduce the size and incidence of myocardial infarction. These beneficial effects are postulated to be due to chronic antithrombotic properties of EPA itself. We studied the possible direct effects of EPA on vascular smooth muscle as ...
journal_title:Basic research in cardiology
pub_type: 杂志文章
doi:10.1007/BF01907066
更新日期:1987-03-01 00:00:00