Search Results
Results 301 - 350 of 1690
< 2 3 4 5 6 7 8 9 10 11 12 >
Knobloch Karsten - - 2005
PURPOSE: This study was to compare noninvasive measurement of cardiac output (CO) using a novel Doppler technique with invasive CO measurements in the postcardiac surgical intensive care unit. DESCRIPTION: Thirty-six patients (67.2 +/- 10 years, New York Heart Association functional class 3.1 +/- 0.3) undergoing coronary revascularization were prospectively examined ...
Gheorghiade Mihai - - 2005
An episode of acute heart failure syndromes (AHFS) can be defined as a rapid or gradual onset of signs and symptoms of heart failure (HF) in hospital admission and can arise from a variety of pathophysiologic mechanisms. This article reviews our current understanding of the pathophysiology of AHFS in order ...
Chen Hui Cheng - - 2005
OBJECTIVE: To assess agreement between arterial pressure waveform-derived cardiac output (PCO) and lithium dilution cardiac output (LiDCO) systems in measurements of various levels of cardiac output (CO) induced by changes in anesthetic depth and administration of inotropic drugs in dogs. ANIMALS: 6 healthy dogs. PROCEDURE: Dogs were anesthetized on 2 ...
Gidlewski Josh - - 2005
Pericardial effusion is a potentially life-threatening problem leading to a rise in the intrapericardial pressure resulting in varying degrees of hemodynamic compromise. Cardiac tamponade occurs when the intrapericardial pressure equals or exceeds right ventricular diastolic filling pressures leading to a decreased cardiac output. In dogs, the most common causes of ...
Brown Clive M - - 2005
Water drinking activates the autonomic nervous system and induces acute hemodynamic changes. The actual stimulus for these effects is undetermined but might be related to either gastric distension or to osmotic factors. In the present study, we tested whether the cardiovascular responses to water drinking are related to water's relative ...
de Vaal J B - - 2005
BACKGROUND: Cardiac output by modelflow pulse contour method can be monitored quantitatively and continuously only after an initial calibration, to adapt the model to an individual patient. The modelflow method computes beat-to-beat cardiac output (COmf) from the radial artery pressure, by simulating a three-element model of aortic impedance with post-mortem ...
Bernstein D P - - 2005
The study's goal was to determine if cardiac output (CO), obtained by impedance cardiography (ICG), would be improved by a new equation N, implementing a square root transformation for dZ/dtmax/Z0, and a variable magnitude, mass-based volume conductor Vc. Pulmonary artery catheterisation was performed on 106 cardiac surgery patients pre-operatively. Post-operatively, ...
Bal Miriam P - - 2005
Glucocorticosteroid treatment is widely used to prevent chronic lung disease in premature infants. Recent studies in adult rats, treated with dexamethasone in the neonatal period, report negative long-term effects on the heart and severely reduced life expectancy. We treated neonatal rats with dexamethasone and studied cardiac function after 4 wk ...
Dávila Diego F - - 2005
Patients with chronic congestive heart failure have a sequential and incessant activation of those neurohormonal systems, which control body fluids, cardiac output and systemic blood pressure. Neurohormonal activation is initially selective and regional. Generalized activation is a late event in the natural history of congestive heart failure. Although the ultimate ...
Della Rocca G - - 2005
The transpulmonary thermodilution indicator (TPID) technique has been recently introduced and diffuse in clinical practice. This "less-invasive" device measures intermittent cardiac output and, based on pulse contour method, continuous cardiac output, that agree with cardiac output obtained with pulmonary artery catheter in different clinical setting. Moreover it allowed stroke volume ...
Turkistani Ahmed A - - 2005
With increasing success of laparoscopy, the hemodynamic changes associated pneumoperitoneum (PPM) was described using invasive and non-invasive techniques with variable results. In the present study, we have used non-invasive cardiodynamic monitor to investigate the hemodynamic changes during laparoscopic cholecystectomy. Eleven patients who underwent laparoscopic cholecystectomy under general anesthesia were studied. ...
Ban Koji - - 2005
BACKGROUND: To explore an alternative to the systemic vascular resistance index (SVRI) for monitoring peripheral circulation in patients in the intensive care unit (ICU), the resistive index (RI) in the upper extremity arteries was measured by using surface Doppler ultrasound. METHODS AND RESULTS: The correlation between RI and vascular resistance ...
Scolletta S - - 2005
BACKGROUND: Cardiac output (CO) can be measured using the pressure recording analytical method (PRAM), which is a new, less invasive technique allowing beat-by-beat stroke volume monitoring from the pressure signals recorded in femoral or radial arteries. METHODS: We investigated PRAM by comparing its cardiac output (PRAM-CO) with paired measurements obtained ...
Montoya Pedro - - 2005
Cardiodynamic and hemodynamic reactions to emotion-eliciting film sequences were investigated. Thirty-two healthy subjects (12 women, 20 men) were randomly assigned to one of two groups. In the first group, anger was induced using selected scenes of the film "Ragtime." In the second group, scenes of the film "The Shining" were ...
Claireaux Guy - - 2005
We exploited the inherent individual diversity in swimming performance of rainbow trout Oncorhynchus mykiss to investigate the hypothesis that maximum cardiac performance is linked to active metabolic rate (AMR) and critical swimming speed (U crit). Six hundred juveniles (body mass approximately 150 g) were screened using a swimming challenge of ...
El-Dawlatly Abdelazeem - - 2005
BACKGROUND: The effects of pneumoperitoneum (ppm) on hemodynamic parameters during bariatric surgery were investigated using the impedance cardiography monitor. METHODS: 11 patients with BMI 46.5+/-10 kg/m2 (range 38.9-60.8 kg/m2) underwent laparoscopic adjustable gastric banding under general anesthesia. Besides routine monitoring, the impedance cardiography (ICG) monitor was used to monitor cardiac ...
Lucitti Jennifer L - - 2005
Altered blood pressure and flow impact cardiac function during morphogenesis. How the arterial system supports cardiac morphogenesis after circulatory disruptions is not well characterized. We manipulated arterial flow via left atrial ligation (LAL) or arterial load via right vitelline artery ligation (VAL) in Hamburger-Hamilton (HH) stage 21 chick embryos. Embryos ...
Montmerle Stéphanie - - 2005
We sought to determine to which pressure a full-coverage anti-G suit needs to be inflated in order to obtain the same stroke volume during a brief exposure to twice the normal gravity (2 G) as that at 1 G without anti-G suit inflation. Nine sitting subjects were studied at normal ...
Karamperis Nikolaos - - 2005
BACKGROUND: It is the prevailing view that convective dialysis techniques stabilize blood pressure. The aim of this study was to compare the intrasession hemodynamics during high-dose predilution hemodiafiltration (HDF) and low-flux hemodialsis, under strict controlled conditions. METHODS: Twelve stable hemodialysis patients were investigated in a randomized crossover blinded controlled trial. ...
Tihtonen Kati - - 2005
BACKGROUND: This descriptive study was designed to evaluate maternal hemodynamics and cardiovascular responses to delivery during cesarean section (CS) under spinal anesthesia. We also assessed the feasibility of a noninvasive and continuous method of measuring cardiac output, namely whole-body impedance cardiography (ICG(WB)), during elective CS. Because of the techniques used ...
Gupta Rajinder K - - 2005
Sudden blood loss of moderate degree causes fall in blood pressure, which is compensated to certain extent by baroreceptor mediated rise in heart rate and vasoconstriction. In case of severe haemorrhage fall in blood pressure is accompanied by bradycardia indicating failure of baroreceptor mediated recovery in blood pressure. In such ...
Kogan Jacob - - 2005
BACKGROUND: Hemodynamic changes, including systemic vascular resistance, in cirrhotic patients during massive paracentesis have been reported, but large and small artery compliance has not yet been investigated. OBJECTIVE: To investigate hemodynamic variables, including small and large artery compliance, in cirrhotic patients during total paracentesis. METHODS: The study included 15 cirrhotic ...
Masutani Satoshi - - 2005
BACKGROUND: Many recent studies suggest that vasopressin deficiency is an important cause of catecholamine-resistant hypotension with vasodilation in adults, but little is known about vasopressin deficiency in children. METHODS: To clarify the usefulness of vasopressin administration in pediatric cathecolamine-resistant hypotension with preserved ventricular contractility, urinary output and blood pressure response ...
Cavalcanti Silvio - - 2006
A computer model of pressure response to hemodialysis-induced hypovolemia is reported. Heart rate and hematocrit, measured in the course of hemodialysis, are imposed as computer model inputs and the model computes the arterial pressure response after tuning model parameters representative of patient's cardiovascular reactivity. Computer model reproduced with good accuracy ...
Naidech Andrew - - 2005
OBJECTIVE: Neurogenic stunned myocardium is a well-recognized complication of subarachnoid hemorrhage. Dobutamine and milrinone are both used for neurogenic stunned myocardium, but there are few data comparing them after subarachnoid hemorrhage. METHODS: We compared the physiological dose response of dobutamine and milrinone in patients with subarachnoid hemorrhage requiring a pulmonary ...
Furuland Hans - - 2005
OBJECTIVE: Changes in blood viscosity and total peripheral resistance may contribute to increased blood pressure during partial correction of renal anemia with erythropoietin. An increase in hemoglobin level is followed by decreases in cardiac output and left ventricular mass. We examined how normalization of hemoglobin in predialysis patients affects both ...
Kivikko M - - 2005
Levosimendan is a new calcium sensitizer developed for the treatment of congestive heart failure. Experimental studies indicate that levosimendan increases myocardial contractility and dilates both the peripheral and coronary vessels. Its positive inotropic effect is based on calcium-dependent binding of the drug to cardiac troponin C. It also acts as ...
Prasso Jason E - - 2005
Changes in mean arterial pressure (MAP) are often assumed to reflect changes in cardiac output (CO). A linear relationship is postulated to exist between these two quantities based upon the circuit model for systemic circulation. Previous studies have correlated changes in CO and MAP. However, to our knowledge, no studies ...
Bodo Michael - - 2005
Intravenous administration of liposomes, including Doxil, can cause severe life-threatening hemodynamic changes in pigs. The reaction is due to complement activation, and it is characterized by massive pulmonary hypertension, systemic hypotension, and severe cardiac abnormalities including falling cardiac output, tachy-or bradycardia with arrhythmia. There were no data suggesting the involvement ...
Li Chenhong - - 2005
To study the possible cardiac function alternation in hypertension, 13 cardiac function parameters such as blood pressure (BP), cardiac output (CO), ejection time (ET) and stroke volume (SV), etc. were measured in 898 subjects. The subjects were grouped into 3 groups by blood pressure, namely: normotension, prehypertension and hypertension group. ...
Bickel Amitai - - 2004
HYPOTHESIS: The creation of positive-pressure pneumoperitoneum during laparoscopic operations can lead to adverse hemodynamic changes, mainly decreased cardiac output. We hypothesized that pneumatic compression sleeves worn on the legs during pneumoperitoneum could abolish the pressure gradient between the abdominal cavity and the legs and so eliminate these adverse hemodynamic changes. ...
Obst Michael - - 2004
OBJECTIVE: Long-term cardiac output measurements in non-anesthetized mice are now possible. We used this technology to study two different hypertensive models in mice. DESIGN: We combined telemetric blood pressure and heart rate recordings with Doppler flow probe cardiac output measurements in mice during treatment with Nomega-nitro-L-arginine methyl ester (L-NAME) and ...
Chan K - - 2004
OBJECTIVE: To describe a syndrome suggestive of tamponade but secondary to increased intra-thoracic pressure due to undetected dyssynchronous expiratory efforts in mechanically ventilated patients soon after cardiac surgery. METHODS: A retrospective chart review of three patients immediately after cardiac surgery. RESULTS: All patients developed the tetrad of decreased blood pressure, ...
Danzi S - - 2004
Thyroid hormone is an important regulator of cardiac function and cardiovascular hemodynamics. Triiodothyronine, (T(3)), the physiologically active form of thyroid hormone, binds to nuclear receptor proteins and mediates the expression of several important cardiac genes, inducing transcription of the positively regulated genes including alpha-myosin heavy chain (MHC) and the sarcoplasmic ...
Goldstein James A - - 2004
The pericardium envelopes the cardiac chambers and under physiological conditions exerts subtle functions, including mechanical effects that enhance normal ventricular interactions that contribute to balancing left and right cardiac outputs. Because the pericardium is non-compliant, conditions that cause intrapericardial crowding elevate intrapericardial pressure, which may be the mediator of adverse ...
Giomarelli Pierpaolo - - 2004
OBJECTIVE: A less-invasive method has been developed that may provide an alternative to monitor cardiac output from arterial pressure: beat-to-beat values of cardiac output can be obtained by pressure recording analytical method (PRAM). The purpose of this study was to assess the reliability of cardiac output determination by PRAM in ...
Gründeman Paul F - - 2004
PURPOSE: In off-pump coronary surgery through sternotomy, exposure of posterior circumflex branches causes circulatory deterioration in both patients and pigs. We assessed cardiac pump function when displacing the pig heart anteriorly with a suction cardiac positioner. DESCRIPTION: Six pigs (+/-80 kg) underwent sternotomy for hemodynamic instrumentation using catheter-tipped manometers and ...
Kenkel Jeffrey M - - 2004
Little is known about the physiology of large-volume liposuction. Patients are exposed to prolonged procedures, general anesthesia, fluid shifts, and infusion of high doses of epinephrine and lidocaine. Consequently, the authors examined the thermoregulatory and cardiovascular responses to liposuction by assessing multiple physiologic factors. The aims of their study were ...
Ishida Toru - - 2004
INTRODUCTION: In the postoperative management of cardiac surgery patients, pulmonary capillary wedge pressure (PCWP) and central venous pressure (CVP) are the most commonly used parameters of preload. However, these pressure parameters are easily affected by ventricular compliance, positive end-expiratory pressure and other factors. The aim of this study was to ...
Burattini Roberto - - 2004
The aims of this study were (a) to apply in the animal with intact baroreflex a two-point method for estimation of overall, effective open-loop gain, G0e, which results from the combined action of baroregulation and total systemic autoregulation on peripheral resistance; (b) to predict specific baroreflex gain by correcting the ...
Olszowka A J - - 2004
Cardiac output (Q) is a determinant of blood pressure and O(2) delivery and is critical in the maintenance of homeostasis, particularly during environmental stress and exercise. Cardiac output can be determined invasively in patients; however, indirect methods are required for other situations. Soluble gas techniques are widely used to determine ...
Feissel Marc - - 2004
OBJECTIVE: To investigate whether the respiratory variation in inferior vena cava diameter (DeltaD(IVC)) could be related to fluid responsiveness in mechanically ventilated patients. DESIGN: Prospective clinical study. SETTING: Medical ICU of a non-university hospital. PATIENTS: Mechanically ventilated patients with septic shock (n=39). INTERVENTIONS: Volume loading with 8 mL/kg of 6% ...
Blyton Diane M - - 2004
STUDY OBJECTIVES: Recent studies suggest a specific association between intrauterine growth restriction that commonly occurs in preeclampsia and decreased maternal cardiac output. Sleep is associated with marked hypertension in preeclampsia. We therefore aimed to determine how sleep influences other hemodynamic parameters in preeclampsia, specifically to determine if sleep-induced exacerbation of ...
Laszlo Gabriel - - 2004
The measurement of cardiac output was first proposed by Fick, who published his equation in 1870. Fick's calculation called for the measurement of the contents of oxygen or CO2 in pulmonary arterial and systemic arterial blood. These values could not be determined directly in human subjects until the acceptance of ...
Al-Said Haffor
Obstructive sleep apnea (OSA) relates to cardiovascular diseases. This study evaluated oxygenation and the ventilatory responses to hypercapnea in OSA in whom cardiac output is elevated. Sleep studies were conducted using CASE system. From an arterial line, blood pressure was monitored directly by blood pressure transducer and blood samples were ...
Sheriff Don D - - 2004
A change in cardiac output induced by a change in cardiac performance is accompanied by opposite changes in cardiac filling pressure owing to the resistive and capacitive properties of blood vessels. The inverse relationship between cardiac output and cardiac filling pressure provides a passive (hydraulic) regulatory mechanism that functions to ...
Fernández J A - - 2004
BACKGROUND: Cardiovascular changes during drainage of pericardial effusion are not well understood, and most studies are of systemic effects and not of right ventricular performance. Thoracoscopy is not widely used to drain pericardial effusions because of haemodynamic changes in relation to the use of single lung ventilation. PATIENTS AND METHODS: ...
Hsu Cheung-Hwa - - 2004
Automatic physiological control of the pneumatic Phoenix-7 total artificial heart (TAH) occupies a pivotal position for clinical application of the device. We developed a fuzzy logic automatic control algorithm for the Phoenix-7. The object of the automatic control system is to regulate the cardiac output at a level desirable for ...
Mukkamala R - - 2004
We have developed a novel technique for monitoring cardiac output (CO) changes by mathematically analyzing a single peripheral arterial blood pressure (ABP) waveform. In contrast to all previous techniques, our technique analyzes the ABP waveform over time scales greater than a cardiac cycle in which complex wave reflections are attenuated. ...
Danzi Sara - - 2003
Thyroid hormone has well-recognized effects on the cardiovascular system and blood pressure regulation. Blood pressure is altered across the entire spectrum of thyroid disease. The effects of hyperthyroidism include increased cardiac output, contractility, tachycardia, widened pulse pressure, decreased systemic vascular resistance, and increased basal metabolic rate. The manifestations of hypothyroidism ...
< 2 3 4 5 6 7 8 9 10 11 12 >