Search Results
Results 551 - 600 of 1297
< 7 8 9 10 11 12 13 14 15 16 17 >
Petersson Magnus J - - 2002
BACKGROUND: Patients with renovascular hypertension (RVH) have high cardiovascular mortality and morbidity. In these patients, overall sympathetic nerve activity is increased. It is unknown, however, whether this increase also involves the heart. OBJECTIVE: We tested the hypothesis that cardiac sympathetic activity is increased in patients with hypertension and renal artery ...
Brunner Michael - - 2002
BACKGROUND: Transmyocardial laser revascularization (TMLR) and left ventricular reduction by endoventricular patch plasty (LVR) are 2 new surgical procedures performed in patients with endstage coronary artery disease and left ventricular dilation/aneurysms, respectively. As these are performed in patients at high risk for sudden cardiac death and may interact with arrhythmogenesis, ...
Kitagawa Hirotoshi - - 2002
With the use of the microdialysis technique, we examined the modulatory effect of ketamine on catecholamine efflux from in vivo cardiac sympathetic nerve endings. A dialysis probe was implanted in the left ventricular myocardium, and dialysate norepinephrine (NE) levels in anesthetized cats were measured with liquid chromatogram-electrical detection. A 60-min ...
Abe Yusei - - 2002
The aim of this study was to clarify the effect of preinfarction angina on heart rate variability (HRV) in anterior wall acute myocardial infarction (AMI). A total of 36 patients experiencing their first anterior wall AMI were prospectively examined. The patients were divided into 2 groups according to the presence ...
Wang Liuyi - - 2002
OBJECTIVE: To investigate whether transdermal scopolamine increased cardiac vagal activity in patients during the acute phase of myocardial infarction. METHODS: 30 patients with a first acute myocardial infarction and preserved sinus rhythm who were on no drug that could influence the sinus node were randomly assigned to either treatment group ...
Tateishi Osamu - - 2002
BACKGROUND: Cheyne-Stokes breathing (CSB) is an abnormal cyclical pattern of respiratory fluctuations observed during sleep in congestive heart failure (CHF) of poor prognosis. We examined the clinical usefulness of CSB screening using the heart rate variability (HRV) data from the ambulatory electrocardiogram. METHODS: We monitored ambulatory electrocardiograms and respiration simultaneously ...
Steeds Richard P - - 2002
AIMS: Heart rate variability (HRV) is a measure of cardiac autonomic control and is therefore subject to regulation by the renin-angiotensin system. The primary objective of this study was to determine the effect of an insertion/deletion polymorphism within the angiotensin-converting enzyme (ACE) gene on HRV in the early stages after ...
Routledge H C - - 2002
Reduced heart rate variability (HRV) is a powerful and independent predictor of an adverse prognosis in patients with heart disease and in the general population. The HRV is largely determined by vagally mediated beat to beat variability, conventionally known as respiratory sinus arrhythmia. Thus, HRV is primarily an indicator of ...
Darbin Olivier - - 2002
PURPOSE: Cardiac autonomic changes accompany complex partial seizures and generalized tonic-clonic seizures, and participate, at least partially, in the sudden and unexpected death in epilepsy (SUDEP). The analysis of the heart rate variability (HRV) is one of the simplest ways of providing insight into autonomic functions. The entropy quantifies the ...
Ekholm Eeva - - 2002
The effects of docetaxel treatment on autonomic cardiac function was studied with 24-h ECG recordings in breast cancer patients pretreated with anthracyclines. Twenty-four women were evaluated before docetaxel treatment and after 3-4 courses of docetaxel 100 mg/m(2). The heart rate, cardiac extrasystoles and heart rate variability (HRV) in both the ...
Villareal Rollo P - - 2002
The autonomic nervous system plays a major role in affecting the cardiac milieu and promoting malignant ventricular activity. The measurement of heart rate variability (HRV) is a noninvasive tool for assessing the status of the autonomic nervous system. A depressed HRV among post-myocardial infarction patients is a well-established risk factor ...
Ando Makoto - - 2002
The relationship between baroreceptor sensitivity (BRS) and cardiac sympathetic nerve function after acute myocardial infarction (AMI) was investigated in 34 patients. BRS was measured during the Valsalva maneuver and cardiac sympathetic function was assessed by the washout rate (WR) of I-123 meta-iodo-benzyl guanidine (123I-MIBG) with planar image (global WR) and ...
Langer Oliver - - 2002
The human cardiac nervous system consists of a sympathetic and a parasympathetic branch with (-)-norepinephrine and acetylcholine as the respective endogenous neurotransmitters. Dysfunction of the cardiac nervous system is implicated in various types of cardiac disease, such as heart failure, myocardial infarction and diabetic autonomic neuropathy. In vivo assessment of ...
Wichter Thomas - - 2002
BACKGROUND: Patients with Brugada syndrome present with characteristic ECG abnormalities (atypical right bundle-branch block and ST-segment elevation) and life-threatening ventricular tachyarrhythmias despite structurally normal hearts. Involvement of the autonomic nervous system is suggested by the occurrence of ventricular tachyarrhythmias and sudden death at rest or during sleep and by changes ...
Joho Shuji - - 2002
OBJECTIVES: This study was designed to elucidate the influence of cardiac sympathetic denervation on the sympathoexcitatory response to acute myocardial ischemia during balloon coronary occlusion (BCO) in humans. BACKGROUND: Alterations of cardiac sympathetic nerve function could modulate sympathetic reflexes originating from the ischemic area. METHODS: In 23 patients with angina ...
Pan Hui-Lin - - 2002
Chest pain caused by myocardial ischemia is mediated by cardiac sympathetic afferents. Although silent nociceptors exist in somatic structures and some visceral organs, their presence in the heart remains uncertain. The present study examined the presence and the functional characteristics of mechanically insensitive cardiac sympathetic afferents using an electrical search ...
Delaney Joseph P A - - 2002
AIM OF THE STUDY: To investigate the effects of myofascial trigger-point massage therapy to the head, neck and shoulder areas on cardiac autonomic tone.Background. No studies have reported on the effect of back massage on autonomic tone as measured by heart rate variability. This is especially relevant to the nursing ...
Bengel Frank M - - 2002
Little is known about the effects of altered sympathetic innervation on the efficiency of the cardiomyopathic heart. Thus, it was the aim of this study to determine non-invasively the relationship between the metabolic cost of cardiac work and alterations of the sympathetic nervous system. In ten patients with chronic idiopathic ...
McCaffery G - - 2002
Multiresolution wavelet analysis has been used to study the heart rate variability in two classes of patients with different pathological conditions. The scale dependent measure of Thurner et al. was found to be statistically significant in discriminating patients suffering from hypercardiomyopathy from a control set of normal subjects. We have ...
Christensen Merete - - 2002
OBJECTIVE: To find out if drugs, position, and endoscopic manipulation during endoscopic retrograde cholangiopancreatography (ERCP) influence the changes in the variability of heart rate. DESIGN: Single-blind randomised trial. SUBJECTS: 10 volunteers given butyscopolamine, glucagon, or saline intravenously on three different study days, and 10 patients who had ERCP without butylscopolamine ...
Zhang Cuntai - - 2002
The effect of the autonomic nerves on the transmural dispersion of ventricular repolarization (TDR) under acute myocardial ischemia in intact canine was investigated. Using the monophasic action potential (MAP) recording technique, MAPs of the epicardium (Epi), mid-myocardium (Mid) and endocardium (Endo) were recorded simultaneously by specially designed plunge-needle electrodes at ...
Muders Frank - - 2002
In the course of cardiac diseases, various neuruhomonal systems in the plasma are activated. So far there have been only isolated results of investigations about the functional state of central neuropeptide systems in cardiac diseases and, in particular, in heart failure. We investigated, therefore, the central vasopressinergic system, an important ...
Majercak I - - 2002
Heart rate variability is the marker of the heart's response to the autonomic nervous system activity. The decrease in HRV is a clinical predictive factor of overall cardiac mortality, and especially that of arrhythmia complications in the population after infarction. The parameters most significantly used in practice include SDNN and ...
Pauza Dainius H - - 2002
The intrinsic cardiac nervous system is known to be important both in the prevention and treatment of risky heart diseases. The present study was designed to determine the topography and 3-dimensional architecture of the intrinsic nervous system in the canine heart highlighting the differences of this system in dogs and ...
Hoyer Dirk - - 2002
The heart rate variability (HRV) is related to several mechanisms of the complex autonomic functioning such as respiratory heart rate modulation and phase dependencies between heart beat cycles and breathing cycles. The underlying processes are basically nonlinear. In order to understand and quantitatively assess those physiological interactions an adequate coupling ...
Guzzetti Stefano - - 2002
OBJECTIVE: The low frequency spectral component (LF; 0.04-0.15 Hz) of heart rate variability (HRV) is considered to be an index of sympathetic modulation of sinus node activity under physiological conditions, although the relationship is less clearly defined in non-physiological conditions. Several cardiovascular diseases are characterized by an absent or blunted ...
Singh R B - - 2002
Autonomic functions, such as increased sympathetic and parasympathetic activity and the brain's suprachiasmatic nucleus, higher nervous centres, depression, hostility and aggression appear to be important determinants of heart rate variability (HRV), which is, itself, an important risk factor of myocardial infarction, arrhythmias, sudden death, heart failure and atherosclerosis. The circadian ...
Szot Wojciech M - - 2002
The purpose of the study was to evaluate the effect of myocardial revascularisation and associated improvement of left ventricular systolic function on heart rate variability in patients after myocardial infarction. The study population consisted of 35 patients, who within the previous 6 months had suffered from myocardial infarction and in ...
Gögenur Ismail - - 2002
OBJECTIVE: Most sudden postoperative deaths occur during the night and we conjectured that this was associated with circadian variations in the autonomic nervous tone, reflected in heart rate variability. DESIGN: Prospective clinical study. SETTINGS: University hospital, Denmark. SUBJECTS: 44 patients who had had major abdominal operations. INTERVENTIONS: Patients were monitored ...
Takase Bonpei - - 2002
PURPOSE: Silent myocardial ischemic episodes as well as decreased heart rate variability (HRV) indices are associated with an unfavorable outcome in patients with coronary artery disease. Nipradilol, which is a nonselective beta-adrenergic and nitrate-like vasodilator anti-anginal agent developed in Japan, may ameliorate silent myocardial ischemia, while it also improves exercise ...
Shimizu Masami - - 2002
Cardiac sympathetic nerve activity is changed in patients with hypertrophic cardiomyopathy (HCM). However, the relationship between heterogeneity of this activity and systolic left ventricular dysfunction in patients with HCM is not well established. This study was performed to evaluate the sympathetic nerve activity in various cardiac regions and to investigate ...
Jonsson Gisli - - 2002
The Carvedilol Acute Myocardial Infarction Study (CAMIS) investigates cardiac remodeling in patients (n = 250) randomized to carvedilol vs atenolol and treated for 12 months after acute myocardial infarction. In a sub-study, we compared sympathetic, hemorrheological and vascular effects in small but particularly well-matched groups of participants who had been ...
Saleh T M - - 2001
Systemic estrogen administration in male rats has been shown to normalize the autonomic dysfunction and reduce the infarct size after permanent middle cerebral artery occlusion (MCAO). Therefore, the present investigation determined if local microinjection of estrogen at the site of the infarct also promoted recovery of autonomic function and reduction ...
Druschky A - - 2001
We studied the post-ganglionic cardiac sympathetic innervation in patients with chronic temporal lobe epilepsy (TLE) by means of [(123)I]metaiodobenzylguanidine-single photon computed tomography (MIBG-SPECT) and evaluated the effects of carbamazepine on cardiac sympathetic innervation. TLE is frequently associated with dysfunction of the autonomic nervous system. Autonomic dysregulation might contribute to unexplained ...
de Milliano P A - - 2001
Sympathetic activation plays a pivotal role in heart failure attributing to the disease process and symptoms of the patient. Myocardial sympathetic activity can be visualized using radioiodinated metaiodobenzylguanidine 123I-MIBG, a structural analogue of norepinephrine (NE). We investigated whether a relation exists between myocardial MIBG uptake and different functional, hemodynamic and ...
Daliento L - - 2001
OBJECTIVES: The study was done to define the role of the autonomic nervous system in postoperative tetralogy of Fallot. BACKGROUND: Subsequent to surgical correction of tetralogy of Fallot, patients are at long-term risk of sudden death owing to ventricular electrical instability. The status of the sympathetic nervous system in these ...
Wakabayashi T - - 2001
Cardiac (123)I-labeled metaiodobenzylguanidine (MIBG) activity has significant incremental prognostic value, but the difference between the long-term prognostic value of MIBG imaging for ischemic cardiomyopathies and the long-term prognostic value of MIBG imaging for idiopathic cardiomyopathies is not clear. This study aimed to determine whether assessment of cardiac (123)I-MIBG activities in ...
Goldstein David S - - 2002
After injection of 6-[18F]fluorodopamine, thoracic positron emission tomographic scanning visualizes the sympathetic innervation of the heart. This report introduces a kinetic model that relates 6-[18F]fluorodopamine positron emission tomographic scanning results to specific aspects of cardiac sympathoneural function. Inputs were the 6-[18F]fluorodopamine concentration in arterial blood and the estimated contribution of ...
Momose M - - 2001
The rich autonomic innervation of the heart plays an important role in modifying cardiovascular function. Recently developed in vivo scintigraphic imaging techniques allow for visualization of the autonomic innervation of the heart. Studies using the modalities have shown heterogeneity of sympathetic innervation in various kinds of pathological conditions as well ...
Miyagawa S - - 2001
BACKGROUND: The left ventricular assist system (LVAS) has been used increasingly for patients with end-stage heart failure who are awaiting transplantation. Sympathetic nerve activity is known to correlate with cardiac function in chronic heart failure patients, but little is known about sympathetic nerve activity during LVAS support. In this study, ...
Calvert C A - - 2001
OBJECTIVE: To determine correlations between time-domain and frequency-domain variables of heart rate variability (HRV) derived from 24-hour recordings obtained by use of an ambulatory electrocardiographic recorder (Holter monitor). ANIMALS: 59 overtly healthy Doberman Pinschers (41 without echocardiographic evidence of cardiomyopathy and 18 with precongestive heart failure attributable to cardiomyopathy). PROCEDURE: ...
Calvert C A - - 2001
OBJECTIVE: To determine whether heart rate variability (HRV) is reduced in Doberman Pinschers with dilated cardiomyopathy. DESIGN: Case series. ANIMALS: 62 overtly healthy Doberman pinschers. PROCEDURE: Heart rate variability was analyzed in time and frequency domains from data obtained during 24-hour ambulatory electrocardiographic Holter recordings in 41 overtly healthy Doberman ...
Hayashi I - - 2001
BACKGROUND: The purpose of this study is to assess the potential of right vagal nerve stimulation for reducing the heart rate during coronary anastomosis without cardiopulmonary bypass. METHODS: Through the fourth left intercostal space, left internal thoracic artery grafts were sutured to the left anterior descending artery with the heart ...
Ellenby M S - - 2001
Healthy physiological systems exhibit marked signal variability and complexity, whereas diseased systems generally show a loss of variability, decreased complexity ("decomplexification"), and increased regularity. The goal of this study was to evaluate the uncoupling and recoupling phenomenon in children with septic shock by observing serial changes in heart rate variability ...
Arora R C - - 2001
BACKGROUND: Prospective trials have demonstrated that transmyocardial laser revascularization (TMLR) imparts symptomatic relief to patients with refractory angina. Because peak clinical effectiveness of TMLR is usually delayed by several months, it has been proposed that ventricular denervation is one mechanism whereby TMLR imparts symptomatic relief. We have demonstrated that TMLR ...
Adigun A Q - - 2001
Cardiac autonomic dysfunction is common in heart disease with or without congestive heart failure, and can cause sudden cardiac death. However, cardiac autonomic abnormalities in non-ischemic (hypertensive) heart failure, which is prevalent in Black Africans is poorly documented. We conducted a cross-sectional study of 32 patients with congestive heart failure, ...
Budgell B - - 2001
The present study examined the effects of cervical spinal manipulation, a widely applied form of physical therapy, which involves innocuous mechanical stimulation, on heart rate and heart-rate variability, in a cohort of healthy young adults. Using a cross-over treatment design, with a one-week washout period and, in contrast to a ...
Kaminaga T - - 2001
PURPOSE: This study was performed to determine whether I-123 metaiodobenzylguanidine (MIBG) scintigraphy can depict myocardial sympathetic nerve abnormalities in Becker muscular dystrophy. MATERIALS AND METHODS: A 34-year-old man with Becker muscular dystrophy underwent Tl-201 and I-123 MIBG scintigraphy sequentially before and 4 months after the beginning of oral administration of ...
Koyama K - - 2001
Myocardial sympathetic neural function in professional athletes who had the long-term tremendous cardiac load has not been fully investigated by myocardial iodine-123-metaiodobenzylguanidine (MIBG) uptake in comparison with power spectral analysis (PSA) in electrocardiography. Eleven male professional cycle racers and age-matched 11 male healthy volunteers were enrolled in this study. The ...
Zareba W - - 2001
Epidemiologic evidence indicates that air pollution adversely affects the cardiovascular system, leading to increased cardiovascular morbidity and mortality. However, the mechanisms of such an association are unknown. Although potential mechanisms of deleterious effects of air pollution may involve response of the respiratory system, immunologic response, or coagulation abnormalities, the cardiovascular ...
< 7 8 9 10 11 12 13 14 15 16 17 >