Search Results
Results 451 - 500 of 1148
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Airaksinen K E - - 2001
Asymptomatic coronary artery disease and myocardial infarctions are common in diabetic subjects. The available clinical and epidemiological data suggest that the increased incidence of asymptomatic myocardial infarctions and coronary artery disease in diabetic patients mainly reflects accelerated coronary atherosclerosis and the proportion of silent disease relative to symptomatic disease or ...
Métais C - - 2001
Since serotonin (5-HT) is implicated in exacerbating acute coronary syndromes, we studied the reactivity of atrial coronary arterioles (70-140 microm) of atherosclerotic patients undergoing cardiac surgery to 5-HT, substance P (Sub P), and sodium nitroprusside by video-microscopy. Before ischemia, 5-HT-induced relaxation was not affected by NS398 (cyclooxygenase inhibitor), H2O2 or ...
Semmoum Y - - 2001
The effect of ischemia on cardiac Leucine enkephalin (Leu-enk) content, degradation and coronary release was studied in the isolated perfused hearts of male Sprague Dawley rats. Hearts were electrically stimulated at 180 beats/min. Cardiac Leu-enk concentrations were increased when hearts were perfused (635 +/- 41 vs 301 +/- 60 fmol/g ...
Omura T - - 2001
There have been many studies concerning the hemodynamics and physiological mechanisms in ischemic heart disease, little is known about molecular mechanisms during myocardial ischemia in in vivo study. As the signal transduction pathway responsible for myocardial hypertrophy and apoptosis, janus kinase (JAK) and signal transducers and activators of transcription (STAT) ...
Adams J E - - 2001
There is a need for blood-based analytic techniques that allow for the detection of patients either with reversible myocardial ischemia or who are at risk for myocardial ischemia. However, given the diverse etiologies of unstable angina and the complex interactions among various cell types, the term "marker for ischemia" should ...
Birnbaum Y - - 2001
Patients with acute myocardial infarction who have terminal QRS distortion in addition to ST-segment elevation (grade III ischemia) on their presenting electrocardiogram have higher mortality and larger final infarct size than patients with ST-segment elevation without changes in the terminal portion of the QRS complex (grade II ischemia). This article ...
Wittnich C - - 2000
BACKGROUND: This study examines the effect of neonatal exposure to clinically relevant hyperoxia levels on both in vivo myocardial metabolism and the subsequent metabolic response to global ischemia. METHODS: Three-day-old pigs were ventilated to normoxia (80 mm Hg, 2 or 5 hours, n = 11), mild hyperoxia (250 mm Hg, ...
Meissner A - - 2000
Volatile anesthetics exert a protective role in myocardial ischemia. An increase in sympathetic tone might exert deleterious effects on the ischemic myocardium. The use of the volatile anesthetic desflurane in myocardial ischemia is controversial because of its sympathetic activation. We compared propofol and desflurane on myocardial stunning in chronically instrumented ...
Marzilli M - - 2000
Patients with Angina Pectoris benefit from therapy with nitrates, beta-blockers, and calcium channel antagonists. All these drugs, through different action mechanisms, tend to reduce cardiac work and restore the balance between myocardial metabolic demand and blood supply. Failure of this conventional haemodynamic treatment in controlling symptoms and preventing ischemia is ...
De Paulis R - - 2000
This report describes the different clinical and instrumental manifestations of coronary ischemia in a patient with left main coronary artery atresia. Exercise test and thallium-201 perfusion scintigraphy during isometric exercise test were negative for angina and electrocardiographic changes. Conversely, dipyridamole infusion caused severe angina, marked ST-segment changes and diffuse thallium-201 ...
Lockowandt U - - 2000
OBJECTIVE: To evaluate the possibility of using microdialysis of blood from the great cardiac vein for detecting myocardial ischemia. DESIGN: Microdialysis catheters were placed in the great cardiac vein and the left atrium of pigs for analysis of lactate, glycerol, pyruvate and glucose. Blood samples were drawn for measurement of ...
Fujishima M - - 2000
OBJECTIVE: Silent or asymptomatic cerebrovascular disease is believed to be an important risk factor for symptomatic stroke and vascular dementia. Although non-specific complaints such as mild to moderate headache and/or dizziness may also be caused by silent stroke, which remains a topic of controversy. METHODS: To investigate the relationship between ...
Dhekne R D - - 2000
OBJECTIVE: The purpose of this study was to evaluate the utility of indium-111 leukocyte (In-111 WBC) scintigraphy in a large number of patients with suspected bowel ischemia. METHODS: All patients who underwent In-111 WBC scintigraphy for possible bowel ischemia over a 4-yr period and had subsequent endoscopic or surgical biopsy ...
Madias J E - - 2000
A 72-year-old man with exertional angina had a strongly positive exercise electrocardiogram (EECG) with a negative thallium-201 myocardial perfusion scintigram (Tl). Arteriography revealed triple-vessel coronary artery disease, for which he underwent aortocoronary bypass grafting. Repeat EECG was negative, and it was again associated with a negative Tl. The false-negative Tl ...
Munger M A - - 2000
Adverse cardiac and pulmonary events are frequently observed during hemodialysis and contribute to significant morbidity and mortality. The temporal relationship between these events during the intradialytic period has not been well defined. To examine the event rate and timing of silent ischemia, cardiac ectopy, and hypoxemia, we conducted a prospective, ...
Orford J L - - 2000
Obstructive coronary artery disease is the most common cause of morbidity and mortality in the developed world. Our understanding of the pathobiology of coronary atherosclerosis provides us with new opportunities to reduce myocardial ischemia by interventions that address these mechanisms directly. These interventions include lipid-lowering therapies that improve local coronary ...
Katsumata1 N - - 2000
Diltiazem has cardioprotective properties following myocardial ischemic injury. However, there are controversial results regarding the beneficial effects of diltiazem on regional myocardial flow after ischemia. Therefore, we investigated the effect of diltiazem on changes in regional myocardial flow due to ischemia for different periods. Non-radioactive colored microspheres were used for ...
Piro F R - - 2000
OBJECTIVE: To investigate and quantify the presence of apoptosis in early myocardial ischemia in humans. METHODS: Histologic sections from the left and right ventricles of 16 hearts with impending myocardial infarction were stained with terminal deoxynucleotidyl transferase-mediated deoxyuridine 5-triphosphate nick end labeling (TUNEL) method and with antibodies to p53, bcl-2, ...
Balaguru D - - 2000
We used continuous intraoperative transesophageal echocardiography (TEE) monitoring to detect intraoperative myocardial ischemia in children after they had been weaned from cardiopulmonary bypass for cardiac surgery. Three pediatric patients are described here to illustrate the usefulness of such TEE monitoring in surgical procedures involving coronary arteries. The indications for intraoperative ...
Miraliakbari R - - 2000
BACKGROUND: Recent clinical use of vascular endothelial growth factor (VEGF) in the treatment of both myocardial and peripheral ischemia has suggested the possibility of tissue specific coregulation of VEGF and its receptors (eg, kinase domain region [KDR]). The present study was performed to detect the relationship between VEGF and KDR ...
Zhang Y - - 2000
36 cases of coronary heart disease with silent myocardial ischemia (SMI) were treated sequentially with Tong Xin Luo (TXL) capsule and isosorbide dinitrate in random order. The results showed that both drugs were effective in decreasing episodes of SMI and shortening the duration of asymptomatic myocardial ischemia. TXL, however, was ...
Tabuchi K - - 2000
The objective of the present study was to examine whether mepacrine, a commonly used phospholipase A2 inhibitor, decreases ischemic damage to the cochlea. Transient ischemia of the cochlea was induced in albino guinea pigs for 15, 30 or 60 min by pressing the labyrinthine artery at the porus acusticus internus. ...
Sunagawa O - - 2000
The objective of the present study was to investigate the differences between coronary hyperresponsiveness without ischemia and vasospastic angina in an ergonovine provocation test using multivariate analysis. We have sometimes experienced a more than 50% narrowing response of vascular diameter without ischemia in a coronary response to ergonovine. We studied ...
Shehadeh A A - - 2000
BACKGROUND: Mortality after acute myocardial ischemia has been reduced by aspirin (ASA) but mechanisms other than the antiplatelet effect have not been established. This article evaluates an antiarrhythmic action during sympathetic stimulation in the intact anesthetized dog with and without ischemia. METHODS AND RESULTS: The ventricular fibrillation threshold (VFT) was ...
Akkerhuis K M - - 2000
Computer-assisted continuous monitoring of the ST-segment allows detection and quantification of recurrent ischemia in patients with acute coronary syndromes. In a substudy of the PURSUIT (Platelet glycoprotein IIb/IIIa in Unstable angina: Receptor Suppression Using Integrilin Therapy) trial, this technique was used to evaluate the effects of the glycoprotein IIb/IIIa inhibitor ...
Umeno Y - - 2000
We herein describe a 70-year-old male patient who developed colonic necrosis following severe acute pancreatitis. He was referred to our hospital with a diagnosis of acute pancreatitis. In the course of the disease, he developed sudden and massive hematochezia and died. The autopsy findings revealed large bowel ischemia with transmural ...
Colonna P - - 2000
Myocardial contraction behaves heterogeneously, being greater in subendocardial than in subepicardial layers. Similarly, during acute myocardial ischemia or infarction, the subendocardium is the first myocardial layer to suffer. Conventional two-dimensional echocardiography cannot distinguish the transmural extension of myocardial ischemia or infarction, showing akinesia also when only the subendocardium is affected. ...
Tanonaka K - - 2000
Contribution of sodium channels and sodium/hydrogen exchangers (NHEs) to sodium accumulation during ischemia in the ischemic/reperfused heart was examined. Ischemia increased the myocardial sodium. Reperfusion elicited a further increase in the myocardial sodium, which was associated with little recovery of the left ventricular developed pressure (LVDP) of the perfused heart. ...
Lubarsky D A DA Department of Anesthesiology, Duke Clinical Research Institute, Duke University Medical Center, Durham, NC 27710, USA. - - 2000
To evaluate the relationship between perioperative ischemia and serial concentrations of D-dimer, which is a sensitive and specific marker of fibrinolytic activity. Myocardial ischemia and infarction are well-recognized complications of peripheral vascular surgery. We hypothesized that patients at increased risk of perioperative myocardial ischemia might be identified preoperatively by abnormal ...
Fink S - - 2000
BACKGROUND: Acute mesenteric ischemia can be a difficult diagnosis to make, but delay contributes directly to infarction, and this may provide a setting for malpractice claims. METHODS: We reviewed 180 consecutive malpractice claims submitted by attorneys for medical expert (ME) review during the 12 years ending in late 1998. Seven ...
Wirth K J - - 2000
ATP-sensitive potassium channels (KATP) open during myocardial ischemia. The ensuing repolarising potassium efflux shortens the action potential. Accumulation of extracellular potassium is able to partially depolarise the membrane, reducing the upstroke velocity of the action potential and thereby impairing impulse conduction. Both mechanisms are believed to be involved in the ...
Semenov S Y - - 2000
The purpose of this study was to assess whether physiologic changes in canine myocardium due to coronary blood flow reduction, ischemia, and infarction could be detected by changes in dielectrical properties. Measurements were made in the frequency range of 0.2-6.0 GHz. Percent coronary blood flow reduction was linearly related to ...
Kalapura T - - 1999
The authors report a case of acute myocardial infarction following gemcitabine infusion and electrocardiographic abnormalities suggestive of ischemia on rechallenge of the drug. The possible underlying mechanisms of ischemia and/or infarction and the strategies for prevention are discussed.
Cohn P F - - 1999
The pathophysiology of silent ischemia remains unclear, but it is extremely prevalent in patients with coronary artery disease. Stress testing is the preferred method of detection, but Holter monitoring is reliable in recording ischemia during daily life and in evaluating therapy. Prognosis is adversely affected by silent ischemia, whether the ...
Marwick T H - - 1999
Unidentified coronary artery disease remains a significant cause of premature death and morbidity during the prime of life. The availability of effective interventions for the management of ischemia has provoked new interest in screening for this condition in asymptomatic patients, in the hope of reducing the burden of this condition. ...
Lotze U - - 1999
In order to assess the prognostic value of silent myocardial ischemia in acute myocardial infarction after thrombolysis and early coronary angiography (14-48 h after start of thrombolysis) including percutaneous transluminal coronary angioplasty, if indicated, 126 patients underwent 24 h-Holter-monitoring in the early postinfarction period. The 24 h-Holter-recording was initiated directly ...
Srivastava S - - 1999
OBJECTIVE: To determine the frequency and effects of weaning-related myocardial ischemia on weaning outcomes in patients with coronary artery disease. DESIGN: Prospective cohort study. SETTING: Medical and cardiac intensive care units of a 300-bed teaching community hospital. MEASUREMENTS AND MAIN RESULTS: Three-lead ST segments, heart rate-systolic blood pressure products, and ...
Mooss A N - - 1999
BACKGROUND: Asymptomatic myocardial ischemia is commonly observed in patients with coronary artery disease. Numerous studies have shown that patients with asymptomatic ischemia are at higher risk for adverse outcome than those without ischemia. Several recent studies have investigated the therapeutic options available in the management of patients with asymptomatic myocardial ...
Lanza G A - - 1999
BACKGROUND: There are limited data about the circadian distribution of ischemic episodes in patients with variant angina. Furthermore, no previous study investigated whether ischemia-related ventricular arrhythmias follow a circadian variation in these patients. METHODS: The circadian variation of transient ischemia and ischemia-induced ventricular arrhythmias was assessed by cosinor methodology on ...
Lau K Y - - 1999
Myocardial ischemia is common during ICUS imaging in women with and without CAD. Although no long-term adverse effects occurred in our small sample, a larger sample of women is required to confirm our observations and to determine the precise mechanisms of ischemia. Such studies may determine whether the smaller diameter ...
Fujitani N - - 1999
A 43-year-old man was found to show cardiac arrest during overnight detention in a police station. The autopsy revealed no abnormality other than a fatty liver on gross examination. Microscopic examination of the heart showed typical disseminated hypoxemic foci of necrosis with hemorrhaging but without infiltration of inflammatory cells, which ...
Napoli C - - 1999
OBJECTIVE: Inducing tolerance to myocardial ischemia by repeated brief episodes of ischemia has been called "ischemic preconditioning." "Warm-up" phenomenon refers to patients with coronary heart disease improving performance after a first exertion and may represent a clinical counterpart to ischemic preconditioning. The goal of this study was to assess whether ...
Chen J - - 1999
OBJECTIVE: To study the expression of vascular endothelial growth factor (VEGF) in different parts of heart during early acute myocardial ischemia. METHODS: The expression of VEGF in control and study group in rats was performed with the Strept Avidin-Biotin-Peroxidase Complex (SABC) method. RESULTS: A rapid expression of VEGF in ischemic ...
Ruotolo R A - - 1999
Mesenteric ischemia is a well-recognized clinical entity among the elderly. Although first described more than 500 years ago, advances in both diagnostic and treatment regimens only minimally have improved on the bleak morbidity and mortality rates associated with this disease. Significant progress, however, has been made in understanding the pathophysiology ...
L'Abbate A - - 1999
This article reviews the factors affecting myocardial ischemia and necrosis beyond coronary obstruction and in particular those related to the function of microcirculation and to the vulnerability of myocardial cells to deprivation as well as to restoration of blood flow. An effort has been spent to distinguish microcirculatory alterations during ...
Brito F S FS - - 1999
Single coronary artery is a rare congenital anomaly, sometimes associated with myocardial ischemia. We present the clinical and angiographic features of two symptomatic patients with documented myocardial ischemia and with distinct and previously undescribed patterns of single right coronary arteries. These cases are new variants of the types R-I and ...
Young L H LH Department of Internal Medicine and Howard Hughes Medical Institute, Yale University School of Medicine, New Haven, Connecticut 06520, - - 1999
Myocardial glucose utilization increases in response to the energetic stress imposed on the heart by exercise, pressure overload, and myocardial ischemia. Recruitment of glucose transport proteins is the cellular mechanism by which the heart increases glucose transport for subsequent metabolism. Moderate regional ischemia leads to the translocation of both glucose ...
Landesburg G - - 1999
It has been speculated but never proven that tachycardia-induced ischemia per se may lead to myocardial infarction. In 17 anesthetized dogs, the proximal left anterior descending (LAD) artery was cannulated and perfused via bypass from the left subclavian artery. Distal LAD pressure was reduced by a screw clamp to cause ...
Kinne G - - 1999
In coronary heart disease (CHD), pathological myocardial ischemic changes do not always occur with the symptom of heart pain. Methodological problems make it difficult to examine the factors that influence silent and symptomatic myocardial ischemia in everyday life. This study uses a computer-assisted monitoring system with an interactive Holter ECG, ...
French G W - - 1999
One hundred and twenty-seven patients undergoing major lower limb joint replacement surgery were studied to determine the incidence of silent myocardial ischemia and to ascertain any link between pre-operative cardiac risk factors, silent myocardial ischaemia and postoperative morbidity. Patients underwent ambulatory ECG monitoring for 4 days (on the pre-operative night ...
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