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Results 201 - 250 of 1702
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Eleftheriadis Savvas - - 2009
INTRODUCTION: The reliability of autocalibrated pressure waveform analysis by the FloTrac-Vigileo(R) (FTV) system for the determination of cardiac output in comparison with intermittent pulmonary arterial thermodilution (IPATD) is controversial. The present prospective comparison study was designed to determine the effects of variations in arterial blood pressure on the reliability of ...
Stover John F - - 2009
Monitoring of cardiac output and blood pressure are standard procedures in critical care medicine. Traditionally, invasive techniques like pulmonary artery catheter (PAC) and arterial catheters are widely used. Invasiveness bears many risks of deleterious complications. Therefore, a noninvasive reliable cardiac output (CO) and blood pressure monitoring system could improve the ...
Xu Da D Department of Electrical and Computer Engineering, Michigan State University, East Lansing, MI 48824, - - 2009
A proven implantable device is now available for long-term ambulatory monitoring of the right ventricular pressure (RVP) waveform of congestive heart failure patients. However, cardiac output (CO) and left atrial pressure (LAP) are far more useful for assessing cardiac function and managing volume status. We developed a new technique to ...
Duschek Stefan - - 2009
Chronic low blood pressure is typically accompanied by symptoms such as fatigue, reduced drive, dizziness, headaches and cold limbs. Reduced cognitive performance, diminished cerebral blood flow and autonomic dysregulation have been furthermore documented in this condition. The present contribution reports two studies exploring systemic hemodynamics in chronic hypotension and their ...
Pendergast D R - - 2009
Water covers over 75% of the earth, has a wide variety of depths and temperatures, and holds a great deal of the earth's resources. The challenges of the underwater environment are underappreciated and more short term compared with those of space travel. Immersion in water alters the cardio-endocrine-renal axis as ...
Chattong Utaiwan - - 2009
Ostrich-meat yor (Thai sausage) was pressurized at 200, 400 and 600MPa, with 40 and 50°C for 40 or 60min, subsequently, the products were assessed by stress control rheometry. Two types of viscoelastic measurement were made. The first was an oscillatory analysis performed at a frequency range of 0.01-10Hz using a ...
Skowno Justin J - - 2008
Maintenance of cardiovascular stability is crucial to safe anesthetic practice, but measurement of cardiac output has been technically challenging, particularly in pediatric patients. Cardiovascular monitoring has therefore generally relied upon pressure-based measurements, as opposed to flow-based measurements. The measurement of cardiac output under anesthesia and in critical care has recently ...
Fanelli Guido - - 2008
STUDY OBJECTIVE: To evaluate the effects on systemic hemodynamics of sequential pneumatic compression of the lower limbs in healthy volunteers. DESIGN: Prospective, self-controlled, volunteer study. SETTING: University teaching hospital. PATIENTS: 11 healthy volunteers, aged 25 +/- 1.3 years. INTERVENTIONS AND MEASUREMENTS: After volunteers underwent a 6-hour period of fasting and ...
Chung R - - 2008
Cardiac resynchronisation therapy (CRT) in the form of biventricular pacing has emerged as a therapeutic option for patients with refractory heart failure. Patient selection and optimisation for CRT is based on the measurement of electromechanical ventricular dyssynchrony by electrocardiogram and echocardiographic techniques. The final common pathway for raising cardiac output ...
van Bemmel T - - 2009
Low blood pressure in the very old has been associated with organ dysfunction and excess mortality but the underlying mechanism has yet to be elucidated. We hypothesized that cardiac dysfunction contributes to low blood pressure in the very old. We invited a convenience sample consisting of 82 participants all aged ...
Oshima Kiyohiro - - 2008
BACKGROUND/AIMS: Thoracic esophagectomy is one of the most invasive operations, and it is necessary to have a precise understanding of postoperative hemodynamics in order to maintain normal circulation. PiCCO (pulse contour cardiac output, Pulsion Medical Systems; Munich, Germany), a new technique based on an arterial thermodilution technique, allows the measurement ...
- - 2008
The minimally invasive CardioQP oesophageal Doppler probe estimates cardiac output by measuring blood flow velocity in the descending aorta. Individual variables to enter are patient's age, weight and height. We measured cardiac output simultaneously with CardioQP and pulmonary artery catheter thermodilution techniques during heart catheterisation in 40 paediatric patients with ...
Siu Lyndon - - 2008
BACKGROUND: The USCOM1A continuous wave cardiac output monitor (USCOM Pty Ltd., Sydney, NSW, Australia) is a novel Doppler-based device used to measure cardiac output noninvasively. The proper alignment of the transducer, and hence the ultrasound beam to the aortic or pulmonary outflow tracts, is essential to acquire accurate measurements and ...
Krauskopf Astrid - - 2008
OBJECTIVE: The aim of this study was to determine whether weight force application to the lower torso can lead to impairment of inferior vena cava (IVC) and cardiovascular parameters. METHODS: Using ultrasound sonography and impedance cardiography, the effects of a weight force application of 5, 10, 15, and 25 kg ...
Archer T L - - 2008
Oxytocin is a commonly used uterotonic that can cause significant and even fatal hypotension, particularly when given as a bolus. The resulting hypotension can be produced by a decrease in systemic vascular resistance or cardiac output through a decrease in venous return. Parturients with normal volume status, heart valves and ...
Dyer Robert A - - 2008
BACKGROUND: Hemodynamic responses to spinal anesthesia (SA) for cesarean delivery in patients with severe preeclampsia are poorly understood. This study used a beat-by-beat monitor of cardiac output (CO) to characterize the response to SA. The hypothesis was that CO would decrease from baseline values by less than 20%. METHODS: Fifteen ...
Lemson Joris - - 2008
OBJECTIVE: This study was undertaken to validate the transpulmonary thermodilution cardiac output measurement (CO(TPTD)) in a controlled newborn animal model under various hemodynamic conditions with special emphasis on low cardiac output. DESIGN: Prospective, experimental, pediatric animal study. SETTING: Animal laboratory of a university hospital. SUBJECTS: Twelve lambs. INTERVENTIONS: We studied ...
Calamandrei Marco - - 2008
OBJECTIVE: To assess cardiac output in pediatric patients with the pressure recording analytical method (PRAM) and the Doppler echocardiography method. PRAM derives cardiac output from beat-by-beat analysis of the arterial pressure profile (systolic and diastolic phase) in the time domain. DESIGN: A prospective observational study. SETTING: Pediatric intensive care unit ...
Bernstein Donald P - - 2008
The pressure pulse contour method for measuring stroke volume (SV) and cardiac output (CO) has come of age. Various methods have been proposed, but at this time no single technique has shown clear superiority over the others. This commentary and review discusses the various methods, and particularly the pressure recording ...
Bao Fang-Ping - - 2008
BACKGROUND: Cardiac output monitoring is important for critical patients. This study aimed to determine the delayed response of continuous cardiac output (CCO) thermodilution measurement, whether CCO and bolus cardiac output (BCO) thermodilution agree sufficiently to be used interchangeably, and whether CCO monitoring is reliable for patients undergoing liver transplantation. METHODS: ...
Auler Jose Otavio JO - - 2008
BACKGROUND: The arterial pulse pressure variation induced by mechanical ventilation (deltaPP) has been shown to be a predictor of fluid responsiveness. Until now, deltaPP has had to be calculated offline (from a computer recording or a paper printing of the arterial pressure curve), or to be derived from specific cardiac ...
van Groningen Lenneke Fj - - 2008
OBJECTIVE: To determine which physiological mechanism is responsible for the blood pressure increase during leg crossing at knee-level in the sitting position. METHODS: Finger blood pressure was measured with the Finometer in 102 participants (47 men) before and during leg crossing: 24 treated hypertensive patients, 50 diabetic individuals (25 with ...
Boucaud C - - 2008
BACKGROUND AND OBJECTIVE: Continuous monitoring of cardiac output during liver transplantation is essential to evaluate the patient's haemodynamic tolerance to acute volume variations. The aim of this study was to compare the cardiac output values obtained with a transoesophageal echo-Doppler and those obtained with a continuous thermodilution cardiac output pulmonary ...
Guo Liang - - 2008
The arteriovenous fistula model of circulation can produce a high output and low peripheral resistance situation. Here, we have examined the effects of noradrenaline, vasopressin and sodium nitroprusside on cardiac index, mean arterial blood pressure, venous tone, resistance to venous return, arterial resistance, and blood volume in chronically shunted anaesthetized ...
Wagner Ann E - - 2008
OBJECTIVE: To measure cardiac output and other hemodynamic variables in anesthetized dogs undergoing laparotomy because of abdominal neoplasia. DESIGN: Prospective case series. ANIMALS: 8 dogs with splenic or hepatic tumors. PROCEDURES: Dogs were anesthetized and underwent abdominal laparotomy. End-tidal isoflurane concentration, heart rate, arterial blood pressures, cardiac output, arterial pH, ...
Chang Shoou-Jinn - - 2008
In this study, we report the growth and characterization of lateral ZnO nanowires (NWs) on ZnO:Ga/glass templates. Using x-ray diffraction and micro-Raman spectroscopy, it was found that crystal quality of the as-grown ZnO NWs is good. It was also found that the average length and average diameter of the laterally ...
Palada Ivan - - 2008
Involuntary breathing movements (IBM) that occur in the struggle phase of maximal apneas produce waves of negative intrathoracic pressure. This could augment the venous return, increasing thereby the cardiac output and gas exchange, and release the fresh blood from venous pools of spleen and liver. To test these hypotheses we ...
Compton F D - - 2008
BACKGROUND: Early haemodynamic assessment is of particular importance in the evaluation of haemodynamically compromised patients, but is often precluded by the invasiveness and complexity of the established cardiac output (CO) monitoring techniques. The FloTrac/Vigileo system allows minimally invasive CO determination based on the arterial pressure waveform derived from any standard ...
Lammey Michael L - - 2008
Sudden cardiac death (SCD), presumed secondary to fatal arrhythmias, is a common cause of mortality in captive chimpanzees at the Alamogordo Primate Facility. Over the 6-year period at the Alamogordo Primate Facility between 2001 and 2006, 13 animals were defined as sudden cardiac death (11 male and 2 female) on ...
Cavallaro F - - 2008
Knowing whether or not a fluid infusion can improve cardiac output (fluid responsiveness) is crucial when treating hemodynamically unstable patients. Generally, cardiac filling pressures (central venous pressure, pulmonary artery occlusion [''wedge''] pressure) and volumes (end-diastolic left and right ventricular volume) are used, although they are not reliable predictors of fluid ...
Brown Clive M - - 2008
Overconsumption of fructose, particularly in the form of soft drinks, is increasingly recognized as a public health concern. The acute cardiovascular responses to ingesting fructose have not, however, been well-studied in humans. In this randomized crossover study, we compared cardiovascular autonomic regulation after ingesting water and drinks containing either glucose ...
Fourie Carla M T - - 2008
BACKGROUND: The prevalence of hypertension among Black adults in South Africa is high. Because cardiovascular reactivity can be used to predict hypertension in later life, we attempted to determine whether cardiac and vascular responses to a task in Black South African children influence their cardiovascular parameters. DESIGN: This study was ...
Müller Stig - - 2008
INTRODUCTION: Arginine vasopressin (AVP) is increasingly used to restore mean arterial pressure (MAP) in low-pressure shock states unresponsive to conventional inotropes. This is potentially deleterious since AVP is also known to reduce cardiac output by increasing vascular resistance. The effects of AVP on blood flow to vital organs and cardiac ...
Denvir Martin A - - 2008
Zebrafish are increasingly used to study the influences of gene mutation and manipulation on cardiac development, structure and function. In this study, a video edge detection system was used to characterise, continuously, cardiac ventricle function in 2-5 days old zebrafish embryos embedded in 0.6% agar and examined under light microscopy ...
Chio Shiu-Shin - - 2007
BACKGROUND: Obtaining cardiac output (CO) measurements noninvasively during routine blood pressure recording can improve hypertension management. A new method has been developed that estimates cardiac output using pulse-waveform analysis (PWA) from a brachial cuff sphygmomanometer. This study evaluates the ability of PWA to track changes in CO as derived by ...
Mutoh Tatsushi - - 2007
BACKGROUND AND PURPOSE: Optimal monitoring of cardiac output and intravascular volume is of paramount importance for good fluid management of patients with subarachnoid hemorrhage (SAH). The aim of this study was to demonstrate the feasibility of advanced hemodynamic monitoring with transpulmonary thermodilution and to provide descriptive data early after SAH. ...
Ning Xue-Han XH Division of Cardiology, Department of Pediatrics, University of Washington, Children's Hospital and Regional Medical Center, 4800 Sand Point Way NE M/S G0035, Seattle, WA 98105, United - - 2008
The International Liaison Committee on Resuscitation (ILCOR) consensus statement includes recommendations and guidelines for therapeutic hypothermia in infants and children. The information supporting these recommendations is sparse, and reveals a need for target temperature and cooling mode data in age-appropriate animal models. Accordingly, we determined cardiac function and hemodynamic indices ...
Duan Sheng Zhong - - 2007
Pressure overload (POL) is a classical model for studying cardiac hypertrophy, but there has been no direct measure of hemodynamics in a conscious ambulatory mouse model of POL. We used abdominal aortic constriction to produce POL and radiotelemetry to measure the blood pressure and heart rate for three weeks. The ...
Lorsomradee S - - 2007
This study compared cardiac output measured with an arterial pressure-based cardiac output measurement system and a thermodilution cardiac output measurement system. We studied 36 patients undergoing cardiac surgery with cardiopulmonary bypass. Simultaneous arterial pressure-based and thermodilution cardiac output measurements were compared before and after cardiopulmonary bypass, and after phenylephrine administration. ...
Pratt Benjamin - - 2007
Work on applying physical and physiological principles for determining cardiac output by analysis of pressure measurements has been pursued for decades. Reference measurements for this kind of cardiac output analysis rely on the pulmonary artery catheter (PAC), considered the clinical gold standard for cardiac output monitoring. Recent advances in signal ...
Mozaffarian Dariush - - 2007
Consistent evidence indicates that modest consumption of fish or fish oil supplementation lowers the incidence of cardiac death and possibly other cardiovascular events. Precise physiologic mechanisms accounting for such reduced clinical risk are not well understood. Animal-experimental studies, randomized trials, and large observational studies indicate that consumption of fish and ...
Mendonça Paula C - - 2007
In situ Starling and power output curves and in vitro pressure-volume curves were determined for winter flounder hearts, as well as the hearts of two other teleosts (Atlantic salmon and cod). In situ maximum cardiac output was not different between the three species (approximately 62 ml.min(-1).kg(-1)). However, because of the ...
Esquivel Amanda O - - 2007
STUDY OBJECTIVE: By using an animal model, we determine whether repeated exposures to a conducted electrical weapon could have physiologic consequences. METHODS: Exposures to the Stinger S-400 conducted electrical weapon were applied to 10 healthy, anesthetized, Yorkshire-cross, male swine by attaching probes from the cartridge to the sternal notch and ...
Wang Jia-Jung - - 2007
We tested the validity of regional impedance cardiography (RIC) for measuring changes in both cardiac output and stroke volume by comparing the values with a 2D ultrasound technique in response to the breath-hold manipulation. Among 13 subjects, changes in the maximum amplitude of the regional impedance waveform from the forearm ...
Tayama Eiki - - 2007
Low systemic vascular resistance (SVR) hypotension concomitant with pulmonary hypertension (PH) is difficult to manage postoperatively because they are often catecholamine-resistant. So, we applied arginine vasopressin (AVP), which is a potent vasoconstrictor in a specific condition, for post-cardiotomy refractory low SVR hypotension concomitant with PH. We treated nine cases of ...
Knobloch K - - 2008
BACKGROUND: Chemotherapy with epirubicin is approved in women with breast cancer and is associated with a certain degree of cardiotoxicity. HYPOTHESIS: Epirubicin changes stroke volume, cardiac output and systemic vascular resistance, while liposomal doxorubicin does not. METHODS: 75 patients with HER-2-positive metastatic breast cancer were continuously measured with CW-Doppler ultrasound ...
Wyffels Piet A H - - 2007
BACKGROUND: It has been shown that ventilation-induced pulse pressure variation (PPV) is a better variable than central venous pressure (CVP) or pulmonary artery occlusion pressure (PAOP) for predicting cardiac output changes after fluid administration. The plethysmographic wave form measured with a fingertip pulse is very similar to the arterial blood ...
de Wilde R B P - - 2007
The bias, precision and tracking ability of five different pulse contour methods were evaluated by simultaneous comparison of cardiac output values from the conventional thermodilution technique (COtd). The five different pulse contour methods included in this study were: Wesseling's method (cZ); the Modelflow method; the LiDCO system; the PiCCO system ...
Nakamura Tomohiko - - 2007
OBJECTIVE: Cardiac uptake of [(123)I]metaiodobenzyl guanidine (MIBG) is reduced in patients with Parkinson's disease (PD). However, the cardiac sympathetic abnormality associated with this reduction is unclear. To unmask this abnormality in PD patients we examined the functional consequences of cardiac beta-receptor activation. METHODS: Cardiovascular responses to stepwise administration of the ...
Dunaway Stacy - - 2007
BACKGROUND: Phenylephrine (PE) is a alpha-adrenergic agent commonly administered by perfusion and anesthesia. It is important to identify the effect of PE, especially on cardiac function. This study was intended to show the effects of PE on cardiac function in the murine model via pressure-volume loops. METHODS: Six C57BL/6J twelve-week-old ...
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