Search Results
Results 101 - 150 of 1828
1 2 3 4 5 6 7 8 9 10 >
Malik Madhur - - 2011
The purpose of this study was to determine the effects of combined low-dose ketamine and etomidate on hemodynamics during cardiac catheterization in children with congenital cardiac shunts. Sixty children undergoing routine diagnostic cardiac catheterization were included: 30 had a right-to-left shunt, and 30 had a left-to-right shunt. Both groups were ...
Yamamoto Nobuyuki - - 2011
The waffle procedure is performed in patients with marked thickening and calcification of the epicardium and no substantial improvement in hemodynamic parameters after pericardiectomy. We retrospectively investigated the efficacy of the waffle procedure in 6 of 11 patients who underwent pericardiectomy. These 6 patients showed no improvement in central venous ...
Grassi Guido - - 2011
Sympathetic activation characterizes essential hypertension, contributing to the development and progression of the high blood pressure state. Throughout the years, evidence has been accumulated to show that adrenergic overdrive also participates in the pathogenesis of the end-organ damage associated with hypertension, including cardiac hypertrophy, left ventricular diastolic dysfunction, and heart ...
Adamson Philip B - - 2011
The purpose of this study was to develop an automated surveillance system, using pressure-based hemodynamic factors that would detect which patients were making the transition from compensated to decompensated heart failure before they developed worsening symptoms and required acute medical care. Intracardiac pressures in 274 patients with heart failure were measured ...
Eichhorn V - - 2011
BACKGROUND: /st> Predicting the response of cardiac output (CO) to volume administration remains difficult, in particular in patients with acutely compromised cardiac function, where, even small amounts of i.v. fluids can lead to volume overload. We compared the ability to predict volume responsiveness of different functional haemodynamic parameters, such as ...
Metzelder S - - 2011
BACKGROUND: /st> Arterial pressure waveform analysis of cardiac output (APCO) without external calibration (FloTrac/Vigileo™) is critically dependent upon computation of vascular tone that has necessitated several refinements of the underlying software algorithms. We hypothesized that changes in vascular tone induced by high-dose vasopressor therapy affect the accuracy of APCO measurements ...
Charles Christopher J - - 2011
Although blood pressure effects have been reported for adrenomedullin 5 (AM-5), a newly identified member of the CGRP super-family, little is known about other biological actions. We report the integrated hemodynamic, hormonal and renal actions of AM-5 (10 and 100 ng/kg/min each for 90 min) in normal conscious sheep. AM-5 ...
Guly Henry - - 2011
This paper describes the use of brandy and other forms of alcohol in the latter part of the 19th and early 20th centuries. Its prime use was as a cardiac stimulant as it seemed to increase the cardiac output and blood pressure. However it was also recognised as a depressant ...
Willie Christopher K - - 2011
A single bout of exercise is associated with postexercise hypotension, transient decreases in autonomic function, and changes in baroreflex sensitivity. The baroreflex is less sensitive to falling blood pressure than to rising blood pressure; we characterized the cardiac baroreflex in terms of hysteresis and its mechanical and neural components. We ...
Mookadam Farouk - - 2011
Aim To study the effect of positional change on inferior vena cava (IVC) diameter. The influence of positional change on IVC size is not well studied. Although the American Society of Echocardiography guidelines for chamber quantification recommend imaging the IVC in the left lateral position, many labs routinely image the ...
Panerai R B - - 2011
The critical closing pressure (CrCP) of cerebral circulation is normally estimated by extrapolation of instantaneous velocity-pressure curves. Different methods of estimation were analysed to assess their robustness and reproducibility in both static and dynamic applications. In ten healthy subjects (mean ± SD age 37.5 ± 9.2 years) continuous recordings of ...
Cataliotti Alessandro A Molecular Medicine, Mayo Clinic, 200 First St. SW, Rochester, MN 55905, USA. - - 2011
Diastolic dysfunction associated with high blood pressure (BP) leads to cardiac remodeling and fibrosis and progression to congestive heart failure. B-type natriuretic peptide (BNP) has BP-lowering, antifibrotic, and antihypertrophic properties, which makes BNP an attractive agent for attenuating the adverse cardiac remodeling associated with hypertension. In the current study, we ...
Nagueh Sherif F - - 2011
Doppler echocardiography is currently applied for the assessment of left ventricular and right ventricular hemodynamics in patients with cardiovascular disease. However, there are conflicting reports about its accuracy in patients with unstable decompensated heart failure. The objective of this study was to evaluate the accuracy of the technique in patients ...
Fujimoto Naoki - - 2011
Pericardial constraint and ventricular interaction influence left ventricular (LV) performance when preload is high. However, it is unclear if these constraining forces modulate LV filling when the heart is unloaded, such as during upright posture, in humans. Fifty healthy individuals underwent right heart catheterization to measure pulmonary capillary wedge (PCWP) ...
Schneider Johanna - - 2011
Increased activity of the sympathetic system is an important feature contributing to the pathogenesis and progression of chronic heart failure. While the mechanisms and consequences of enhanced norepinephrine release from sympathetic nerves have been intensely studied, the role of the adrenal gland in the development of cardiac hypertrophy and progression ...
Winkler Christine - - 2011
OBJECTIVES: Patients with cirrhosis often exhibit abnormalities in cardiovascular regulation and oxygenation. Many of these patients are treated with β-blockers and aldosterone antagonists that may influence the regulation of systemic haemodynamics, but the specific effects on systemic haemodynamics and oxygenation are less studied. We therefore investigated systemic haemodynamics and oxygenation ...
Hwang You-Cheol - - 2012
Abnormal left ventricular (LV) structure and diastolic function are frequently detected in a variety of heart diseases, and insulin resistance has been suggested to be associated with LV diastolic dysfunction (LVDD). The aims of this study were to determine the association between LVDD or LV structure and metabolic syndrome (MetS) ...
Paget Vinciane - - 2011
Natriuretic peptides are controregulatory hormones associated with cardiac remodeling, namely, left ventricular hypertrophy and systolic/diastolic dysfunction. We intended to address the prognostic value of N-terminal pro-brain natriuretic peptide (NT-proBNP) in hypertension. We prospectively studied the relationship between plasma NT-proBNP and all-cause mortality in 684 hypertensive patients with no history or ...
Niizeki Kyuichi - - 2011
To determine the effects of muscle pump function on cardiac autonomic activity in response to quiet standing, we simulated the muscle pump effect by rhythmic lower leg cuff inflation (RCI) with 4 cuff pressures of 0 (sham), 40, 80, and 120 mmHg at 5 cycles/min. The R-R interval (RRI) and ...
Qi Guanming - - 2011
The activated renin-angiotensin-aldosterone system increases blood pressure and intracellular signals, thus leading to cardiac fibrosis. Whether increased blood pressure or angiotensin II-activated signaling is responsible for elevated angiotensin II-induced cardiac remodeling is unknown. Here, we aimed to determine whether lowering blood pressure with hydralazine might prevent inflammation and cardiac fibrosis ...
Nagy Gábor - - 2011
Background/Aims: Dual renin-angiotensin system (RAS) blockade has no more efficiency to decrease cardiovascular mortality than mono-blockade. Our goal was to explore differences between other cardiovascular markers in patients with RAS blockade. Methods: We analyzed two groups of patients treated with a long-term ACE inhibitor (MONO-group, n = 20) and an ...
Giraud Raphael - - 2011
BACKGROUND:: Respiratory change in pre-ejection period (ΔPEP) has been described as a potential parameter for monitoring cardiac preload dependency in critically ill patients. This study was designed to describe the relationship between ΔPEP and pulse pressure variation (PPV) in pigs submitted to severe hemorrhagic shock. METHODS:: In 17 paralyzed, anesthetized ...
Andersen Stig - - 2011
BACKGROUND: Elevated blood pressure is a risk factor for cardiovascular disease and may be detected by left ventricular hypertrophy (LVH) in electrocardiogram (ECG). Pre-western Inuit had frequent signs of LVH in ECG predominantly in the 3rd decade while a low occurrence of ischemic heart disease. METHODS: We evaluated the association ...
Velpula Madhavi - - 2011
We describe the case history of a 42-year-old man with cardiac cirrhosis, portal hypertension, and life-threatening variceal bleeding after Fontan revision surgery. Direct pressure measurements in the portal vein, though high, demonstrated only a modest portosystemic gradient (PSG), 9 mm Hg. A transjugular intrahepatic portosystemic shunt procedure was performed. This reduced the ...
Jiang Lijun - - 2011
Total liquid ventilation (TLV) is a promising treatment for severe lung injury and heart resuscitation. We aim to investigate the hemodynamic effect of TLV in piglets with preexisting cardiac dysfunction. After onset of cardiopulmonary dysfunction induced by cardiopulmonary bypass (CPB), piglets were randomly treated with TLV (n = 6) or conventional gas ...
Kim In Byung - - 2011
Pulse pressure variation (PPV) is an accepted measure of intravascular filling. It can now be estimated automatically. However, there is limited knowledge of the epidemiology and associations of such estimates in cardiac surgery patients. We conducted a pilot prospective observational study of the epidemiology and associations of automatically estimated PPV ...
Erblich Joel - - 2011
Laboratory exposures to smoking cues have been shown to reliably induce self-reported cigarette cravings among smokers, a model of environmentally triggered urges to smoke that can contribute to poorer cessation success. Several studies have also demonstrated that cue exposures give rise to changes in heart rate and blood pressure. Few ...
Kamran Haroon - - 2011
Nonhuman primates are used frequently in cardiovascular research. Cardiac time intervals derived by phonocardiography have long been used to assess left ventricular function. Electronic stethoscopes are simple low-cost systems that display heart sound signals. We assessed the use of an electronic stethoscope to measure cardiac time intervals in 48 healthy ...
de Heer Linda M - - 2011
Cardiac pulsatility and aortic compliance may result in aortic area and diameter changes throughout the cardiac cycle in the entire aorta. Until this moment these dynamic changes could never be established in the aortic root (aortic annulus, sinuses of Valsalva and sinotubular junction). The aim of this study was to ...
Zile Michael R - - 2011
The purpose of this study was to determine which pressure-based hemodynamic factor was most closely associated with the transition from chronic compensated to acute decompensated heart failure. Intracardiac pressures were retrospectively examined in 274 heart failure patients using an implantable hemodynamic monitor. The relationship between the development of a heart ...
Aronson Solomon - - 2011
Background: Few studies describe an association of perioperative blood pressure stability with postoperative outcome. We tested the hypothesis that systolic blood pressure (SBP) variability in patients undergoing cardiac surgery is associated with 30-day mortality. Methods: Perioperative blood pressure variability was evaluated in the 1512 patients who were randomized and had ...
Maeder Micha T - - 2011
The accuracy of Doppler echocardiography to estimate key hemodynamic parameters in subjects with normal left ventricular ejection fraction (LVEF) has not been fully investigated. Thirty-six subjects with LVEF >50% (median age 62 years), with a broad clinical profile, underwent Doppler echocardiography immediately followed by right heart catheterization. Correlation coefficients between ...
Kalk Philipp - - 2011
Hypertensive heart disease is a major contributor to cardiovascular mortality. Endothelin is a potent vasoconstrictive and profibrotic mediator produced by the endothelin-converting enzyme (ECE), whereas natriuretic peptides, degraded by the neutral endopeptidase (NEP), have diuretic, vasodilatory, and antifibrotic properties. Thus, combined ECE/NEP inhibition may halt hypertensive cardiac remodeling. This study ...
Dujic Zeljko - - 2011
Breath hold divers are faced with two main physiological challenges: pressure induced compression and extended time without breathing, exposing them to extremes of hypoxia/hypercapnia. Current world records are 214m for depth and 11:35min for duration. Hypoxic loss of consciousness is frequently observed during competitions. The major physiological components of the ...
Amigoni Angela - - 2011
In this study we monitored renal, hepatic and muscular oxygen saturations by near-infrared spectroscopy and we evaluated the correlation with variables that could affect tissue oxygenation in 16 paediatric patients during surgical heart procedure. We considered the following phases: 1) basal time (after induction of anaesthesia and before median sternotomy), ...
Fogari Roberto R Department of Internal Medicine and Therapeutics, Centro per l'ipertensione e la fisiopatologia cardiovascolare, University of Pavia, Pavia, Italy. - - 2012
This study evaluated the effect of telmisartan, ramipril, and amlodipine on atrial fibrillation (AF) recurrence and severity in hypertensive patients with metabolic syndrome. A total of 391 hypertensive outpatients with metabolic syndrome, in sinus rhythm but with at least 2 episodes of AF in the previous 6 months were randomized ...
Santhanakrishnan Arvind - - 2011
The morphology, muscle mechanics, fluid dynamics, conduction properties, and molecular biology of the developing embryonic heart have received much attention in recent years due to the importance of both fluid and elastic forces in shaping the heart as well as the striking relationship between the heart's evolution and development. Although ...
Monnet Xavier - - 2011
OBJECTIVE:: To evaluate to which extent the systemic arterial pulse pressure could be used as a surrogate of cardiac output for assessing the effects of a fluid challenge and of norepinephrine. DESIGN:: Observational study. SETTING:: Medical intensive care unit. PATIENTS:: Patients with an acute circulatory failure who received a fluid ...
Howard Siobhán - - 2011
The Type D personality (identified by high levels of both negative affectivity and social inhibition) has been associated with negative health consequences in cardiac patients. However, few studies have explored whether the Type D personality is associated with particular patterns of cardiovascular responses to stress. In the present study, cardiovascular ...
Koeken Yvette - - 2011
Clinical observations suggest that the assumption of a linear relationship between chest compression pressure and cardiac output may be oversimplified. More complex behaviour may occur when the transmural pressure is large, changing the compliances and resistances in the intra-thoracic vasculature. A fundamental understanding of these compression induced phenomena is required ...
Lancien Frédéric - - 2011
Although PACAP and VIP exert diverse actions on heart and blood vessels along the vertebrate phylum, no information is currently available concerning the potential role of these peptides on the regulation of the baroreflex response, a major mechanism for blood pressure homeostasis. Consequently, the goal of this study was to ...
Okutucu Sercan - - 2011
Arterial blood pressure fluctuates with a pattern that follows a circadian rhythm, with a peak in the early morning hours and a trough during nighttime. Nocturnal dipping of arterial blood pressure is part of this normal circadian pattern, and its absence, which is called non-dipping is associated with more severe ...
Hamid Tahir - - 2011
The pressure wire has emerged as a useful tool to assess the clinical severity of moderate coronary artery lesions. We report a novel use of the pressure wire in adult patients with complex congenital cardiac disease in whom it was used in assessing pressures beyond the stenosis in the distal ...
Neira Victor M - - 2011
PURPOSE: The prone position is required for posterior spinal fusion surgery and may be associated with cardiovascular changes, including a decrease in venous return and cardiac index. We report a case of a patient who developed cardiovascular collapse, increased central venous pressure (CVP), and massive bleeding during posterior spinal fusion ...
Kittnar Otomar - - 2011
Operations in pleural cavity have circulatory effects both in pulmonary and systemic circulations. Nevertheless studies of these effects have yielded conflicting results. The importance of good understanding of hemodynamic changes during the operation in pleural cavity consists in fact that they are one of the factors influencing postoperative course of ...
Cuspidi Cesare - - 2011
The association between a blunted decrease in day–night heart rate and subclinical organ damage has not been investigated earlier in human hypertension. Therefore, we assessed such an association in a cohort of 658 untreated essential hypertensive patients. All patients underwent procedures including cardiac and carotid ultrasonography, 24-h urine collection for ...
Oka H - - 2011
Background:  Clinical symptoms of Parkinson's disease (PD) include not only motor distress, but also autonomic dysfunction. Objective:  To study the characteristics of subclinical autonomic nervous dysfunction in de novo PD without orthostatic hypotension (OH). Methods:  Autonomic nervous function including cardiac sympathetic gain was evaluated on the basis of cardiac radioiodinated ...
Guglin Maya - - 2011
Renal dysfunction in heart failure is thought to be due to poor perfusion of the kidney. We tested the hypothesis that passive congestion is more important than poor perfusion. We retrospectively studied the data on 178 patients who underwent right heart catheterization for evaluation of heart failure and had serum ...
Etter Karen E - - 2011
Eur J Clin Invest 2011 ABSTRACT: Background  Of the many possible factors that may contribute to orthostatic intolerance, the loss of circulating blood because of capillary filtration is one of the few that can explain the gradual decline of arterial pressure during stand tests. This study used a computer model ...
Amin Ahmad - - 2011
The authors studied the relationship between liver function tests and serum uric acid level with clinical and hemodynamic profiles in heart failure. Fifty patients (aged 44±15 years; 74.5% men) with an ejection fraction (EF) <35% were enrolled and clinical assessment was performed. Hemodynamic indices (including pulmonary arterial pressure [PAP], pulmonary ...
1 2 3 4 5 6 7 8 9 10 >