Search Results
Results 251 - 300 of 1698
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Ifuku Hirotoshi - - 2007
By using (dP/dt)/P of carotid artery pulse, a non-invasive index of cardiac contractility, we examined the regulatory mechanism of cardiac function during a cold pressor test in athletes and untrained subjects. Twenty-four healthy subjects (9 athletes, 8 untrained subjects, and 7 hyperreactors of 4 athletes and 3 untrained subjects with ...
Liu Xinxin - - 2007
The present study investigated the circulatory responses to two mental tasks. Forty males and females performed a mental subtraction task and a color-word task. During each task, the systolic and diastolic blood pressure, mean arterial pressure, heart rate, stroke volume, cardiac output, and total peripheral resistance were measured as cardiovascular ...
Walpoth B H - - 2007
BACKGROUND: Skeletal muscular counterpulsation (MCP) has been used as a new noninvasive technique for treatment of low cardiac output. The MCP method is based on ECG-triggered skeletal muscle stimulation. The purpose of the present study was to evaluate acute hemodynamic changes induced by MCP in the experimental animal. METHODS: Eight ...
Meyhoff C S - - 2007
BACKGROUND AND OBJECTIVE: In most studies of cardiac output changes after spinal anaesthesia, the time-resolution is limited. The aim of this study was to demonstrate cardiac output changes with high time-resolution during onset of spinal anaesthesia in elderly patients. METHODS: We investigated 32 patients aged 60 yr scheduled for elective ...
Squara Pierre - - 2007
OBJECTIVE: To evaluate the clinical utility of a new device for continuous noninvasive cardiac output monitoring (NICOM) based on chest bio-reactance compared with cardiac output measured semi-continuously by thermodilution using a pulmonary artery catheter (PAC-CCO). DESIGN: Prospective, single-center study. SETTING: Intensive care unit. PATIENTS: Consecutive adult patients immediately after cardiac ...
Breukers Rose-Marieke B G E - - 2007
OBJECTIVES: To investigate whether measuring cardiac output and its course after cardiac surgery by a new analysis technique of radial artery pressure waves, without need for calibration (FloTrac/Vigileo [FV]; Edwards Lifesciences, Irvine, CA), conforms to the standard bolus thermodilution method via a pulmonary artery catheter (PAC). DESIGN: Prospective study. SETTING: ...
Hangai-Hoger Nanae - - 2007
OBJECTIVE: To determine how top loads with different doses of carbon monoxide (CO)-saturated saline solutions (CO-saline) affect microvascular and systemic hemodynamics and to delineate the corresponding biochemical mechanisms. DESIGN: Prospective study. SETTING: University research laboratory. SUBJECTS: Male Golden Syrian hamsters. INTERVENTIONS: Hamsters implemented with a dorsal window chamber were given ...
Farrell Anthony P - - 2007
We examined maximum cardiac performance of sea bass Dicentrarchus labrax acclimated to 18 degrees C and 22 degrees C, temperatures near the optimum for growth of this species. Our aim was to study whether cardiac performance, especially the effect of adrenergic stimulation, differed when compared to salmonids. Sea bass and ...
Millar K J - - 2007
In recent years, it has been our practice to treat persistent hypotension in the cardiac intensive care unit with glucocorticoids. We undertook a retrospective review in an attempt to identify predictors of a hemodynamic response to steroids and of survival in these patients. Patients who had received glucocorticoids for hypotension ...
Sano Masanori - - 2007
Cardiac hypertrophy occurs as an adaptive response to increased workload to maintain cardiac function. However, prolonged cardiac hypertrophy causes heart failure, and its mechanisms are largely unknown. Here we show that cardiac angiogenesis is crucially involved in the adaptive mechanism of cardiac hypertrophy and that p53 accumulation is essential for ...
Schmidt Sven - - 2007
OBJECTIVE: Transpulmonary thermodilution is increasingly used for hemodynamic monitoring of critically ill patients. Injection of a cold saline bolus in the central venous circulation is a prerequisite for transpulmonary thermodilution measurements. Superior vena cava access is typically used for injection. This access, however, is not feasible or available in all ...
Rankovic Vitomir I - - 2007
BACKGROUND/AIMS: Cytoreductive surgery and hyperthermic intraperitoneal perioperative chemotherapy (HIPEC) significantly improves patients survival with peritoneal carcinomatosis especially in low-grade tumor e.g. ovarian and appendiceal adenocarcinoma, peritoneal pseudomyxoma and grade I gastric and colorectal cancer. METHODOLOGY: During a period of nine years, hemodynamic and cardiac functions combined with urinary output during ...
Crisafulli Antonio - - 2007
The muscle metaboreflex is enhanced in chronic heart failure (CHF) patients, and this fact has been associated with the early fatigue shown by these patients in response to exercise. In animal studies of CHF, it was found that the limited capacity to enhance ventricular performance is responsible for a functional ...
Chattong Utaiwan - - 2007
"Yor" is a traditional sausage like product widely consumed in Thailand. Its textures are usually set by steaming, in this experiment ultra-high pressure was used to modify the product. Three types of hydrocolloid; carboxymethylcellulose (CMC), locust bean gum (LBG) and xanthan gum, were added to minced ostrich meat batter at ...
Okrainec A - - 2007
BACKGROUND: Commonly used perioperative measurements of hemodynamics, such as Swan-Ganz catheter assessment, are invasive and may not be reliable under pneumoperitoneum. The purpose of this study was to validate the use of esophageal Doppler for noninvasive hemodynamic monitoring under pneumoperitoneum in an experimental pig model. METHODS: Eight female pigs were ...
Castiglioni Paolo - - 2007
Seismocardiogram (SCG) is the recording of body vibrations induced by the heart beat. SCG contains information on cardiac mechanics, in particular heart sounds and cardiac output. In this paper we present a new wearable device for SCG recordings during long term monitorings, and the results of a validation test in ...
Magder Sheldon - - 2007
Central venous pressure (CVP) is commonly measured, but its clinical use is still not clear. We argue that the interpretation of the CVP needs to be considered in conjunction with an assessment of cardiac output. The objective of this study was to define an elevated CVP as one in which ...
Olivier Nicolas - - 2007
OBJECTIVE: To evaluate the effects of knee surgery on hematocrit and hemoglobin concentration and on resting cardiac parameters as measured by echocardiography. DESIGN: Ten soccer players who underwent knee surgery were evaluated before (T1) and after (T2) hospitalization within a 7-day interval. RESULTS: After hospitalization, end diastolic volume and stroke ...
Sodolski Tomasz - - 2007
This year marks 40 years since the technique was designed of measuring and monitoring the basic haemodynamic parameters in humans by means of impedance cardiography (ICG), also known as "impedance plethysmography of the chest", "electrical bioimpedance of the chest" or "reocardiography". The method makes it possible to denote stroke volume ...
Yamashita Kazuto - - 2007
Minimally invasive cardiac output was determined using transthoracic bioimpedance (BICO), partial carbon dioxide rebreathing (NICO) and transesophageal Doppler echocardiography (TEECO) and compared to thermodilution (TDCO) in 6 beagle dogs. The dogs were 2 years old, weigh between 9.1-13.0 kg and were anesthetized with nitrous oxide-oxygen-sevoflurane. All dogs were administered a ...
Manole Mioara D - - 2006
OBJECTIVE: Gasping, also known as agonal respirations, is the terminal pattern that occurs after anoxia or ischemia and is a universal phenomenon in mammals. In this article we review the physiology of gasping, the prevalence and significance of gasping in cardiac arrest, and the effects of gasping on cardiac function. ...
Takamori Motoko - - 2007
Patients with multiple system atrophy (MSA) often have clinically significant postprandial hypotension (PPH). To elucidate the cause of insufficient cardiac preload augmentation that underlies PPH, we recorded calf venous capacitance (CVC) by strain-gauge plethysmography, in 17 MSA patients and eight healthy controls before and after oral glucose ingestion. Among 17 ...
Saguer Elena - - 2007
The effects of a high hydrostatic pressure (HHP) treatment (450MPa, 15min at 20°C) on both the microbiological quality and the functional properties of plasma from biopreserved porcine blood were evaluated. Blood was inoculated with Enterococcus raffinosus-PS99 (10(7)ufcmL(-1)) and stored at 5°C. After 72-h storage, bacterial counts in inoculated samples decreased ...
Tan K H - - 2006
INTRODUCTION: Physio Flow is a non-invasive impedance cardiograph device that measures cardiac output. Recommended electrode placements involve six electrodes, including two near the xiphisternum (Z3 and Z4/ ECG3/neutral). This study aims to evaluate if changing the positions of these two leads to the left fourth and fifth intercostal spaces along ...
Manecke Gerard R GR Jr Department of Anesthesiology, UCSD Medical Center, San Diego, CA 92103, USA. - - 2007
The purpose of this study was to evaluate the accuracy and precision of a novel algorithm that evaluates cardiac output by using arterial pressure waveform characteristics. Prospective, observational study comparing the cardiac output values of intermittent thermodilution, continuous thermodilution, and continuous arterial pressure wave assessment. The intensive care unit in ...
Noori Shahab - - 2006
OBJECTIVE: We sought to investigate whether the increase in blood pressure and decrease in vasopressor support after hydrocortisone administration are associated with changes in systemic hemodynamics in neonates who receive high-dosage dopamine to maintain blood pressure at the lowest acceptable levels. METHODS: In this prospective, observational study, preterm and term ...
Katori Tatsuo - - 2006
Generation of peroxynitrite (ONOO-) as a result of altered redox balance has been shown to affect cardiac function; however, inconsistencies in the data exist, particularly for myocardial contractility. The hypothesis that the cardiac impact of ONOO- formation depends on its site of generation, intravascular or intramyocardial, was examined. Cardiac contractility ...
Kristensen Jens - - 2006
BACKGROUND: Previous studies in rodents from different kinds of shock models and isolated vessel models indicate that erythropoietin (EPO) has haemodynamic effects through interaction with sympathetic stimuli. This has relevance to the recently described non-haematopoietic effects of EPO, e.g. tissue protective effects. Studies describing the acute effects on integrated physiological ...
Svensén Christer H - - 2006
We studied whether central hemodynamics measured by a pulmonary artery catheter can serve as a pharmacodynamic expression of fluid therapy in 10 patients undergoing open abdominal surgery. We examined how closely hemodynamic variables follow plasma dilution, which is an index of plasma volume expansion, during and after an IV infusion ...
Perner A - - 2006
BACKGROUND: Stroke volume variation (SVV)--as measured by the pulse contour cardiac output (PiCCO) system--predicts the cardiac output response to a fluid challenge in patients on controlled ventilation. Whether this applies to patients on pressure support ventilation is unknown. METHODS: Thirty consecutive patients with septic shock were included. All were on ...
Sagristà-Sauleda Jaume - - 2006
BACKGROUND: Low-pressure cardiac tamponade is a form of cardiac tamponade in which a comparatively low pericardial pressure results in cardiac compression because of low filling pressure. This syndrome is poorly characterized because only isolated cases have been reported. We conducted a study of its clinical and hemodynamic profiles. METHODS AND ...
Hewitt Nicky A - - 2006
Cardiac output (CO) determination by pulmonary artery (PA) catheter has increasingly been criticised within the literature due to its invasive nature and poor correlation between the pressure measurements and intravascular volume status in mechanically ventilated patients. Consequently, alternative less invasive technologies to PA catheterisation are emerging within intensive care. One ...
Prisant L Michael - - 2006
Isolated systolic hypertension is the most common form of hypertension, especially among patients 50 years or older. What is not appreciated is that there are secondary causes of isolated systolic hypertension. Hyperthyroidism increases systolic blood pressure by decreasing systemic vascular resistance, increasing heart rate, and raising cardiac output. Potential cardiovascular ...
Lopes Marcel Rezende - - 2006
In order to turn a fluid challenge into a significant increase in stroke volume and cardiac output, 2 conditions must be met: 1) fluid infusion has to significantly increase cardiac preload and 2) the increase in cardiac preload has to induce a significant increase in stroke volume. In other words, ...
de Wilde R B P - - 2006
This study was performed to determine the interchangeability of femoral artery pressure and radial artery pressure measurements as the input for the PiCCO system (Pulsion Medical Systems, Munich, Germany). We studied 15 intensive care patients following cardiac surgery. Five-second averages of the cardiac output derived from the femoral artery pressure ...
Lu Zhenwei - - 2006
We present an evaluation of a novel technique for continuous (i.e., automatic) monitoring of relative cardiac output (CO) changes by long time interval analysis of a peripheral arterial blood pressure (ABP) waveform in humans. We specifically tested the mathematical analysis technique based on existing invasive and noninvasive hemodynamic data sets. ...
Shiels Holly A - - 2006
During vertebrate evolution there has been a shift in the way in which the heart varies cardiac output (the product of heart rate and stroke volume). While mammals, birds, and amphibians increase cardiac output through large increases in heart rate and only modest increases (approximately 30%) in stroke volume, fish ...
Sakka Samir G - - 2007
OBJECTIVE: The effects of increasing cardiac output by epinephrine on indocyanine green plasma disappearance rate (ICG-PDR) and gastric mucosal PCO(2) (P(R)CO(2)) were studied as indicators of splanchnic microcirculation. DESIGN: A prospective clinical study. SETTING: Intensive care unit of a university hospital. PARTICIPANTS: With ethics approval and written consent, 12 elective ...
Drake Victoria J - - 2006
It is controversial whether trichloroethylene (TCE) is a cardiac teratogen. We exposed chick embryos to 0, 0.4, 8, or 400 ppb TCE/egg during the period of cardiac valvuloseptal morphogenesis (2-3.3 days' incubation) . Embryo survival, valvuloseptal cellularity, and cardiac hemodynamics were evaluated at times thereafter. TCE at 8 and 400 ...
Kreissl Michael C - - 2006
The aim of this study was to explore the feasibility of determining parameters of cardiovascular function in mice noninvasively by high-temporal-resolution imaging with a dedicated small-animal PET system. Twenty-five anesthetized mice (28.8 +/- 4.6 g) were injected via an intravenous catheter with a 30-microL bolus of (18)F-FDG (8-44 MBq). The ...
Senzaki Hideaki - - 2006
OBJECTIVES: In the present study, we systematically tested cardiac rest and reserve function in patients with Fontan physiology to check for inherent limitations of this circulation. BACKGROUND: Details of the mechanisms of cardiac performance that could account for adverse outcome after Fontan surgery are not well understood. METHODS: The subjects ...
Dharmavaram Sreenivasa - - 2006
STUDY DESIGN: Prospective randomized study of patients undergoing spine surgery. OBJECTIVE: To compare changes in hemodynamic and cardiac function after prone positioning using different prone positioners. SUMMARY OF BACKGROUND DATA: Prone positioning decreases blood pressure and cardiac function. Several studies have evaluated changes in cardiac function after prone positioning, and ...
Kulandavelu Shathiyah - - 2006
In humans, the increased cardiovascular demands of pregnancy are met by increases in cardiac output (CO), stroke volume (SV), plasma volume (PV), and cardiac and aortic inner dimensions and a concurrent decrease in arterial pressure that indicates a fall in total peripheral vascular resistance. The mechanisms responsible for these changes ...
Trivieri Maria Giovanna - - 2006
Thyroid hormone (TH) is critical for cardiac development and heart function. In heart disease, TH metabolism is abnormal, and many biochemical and functional alterations mirror hypothyroidism. Although TH therapy has been advocated for treating heart disease, a clear benefit of TH has yet to be established, possibly because of peripheral ...
Bernard Fabrice - - 2006
To identify dysrhythmias and hemodynamic changes after lidocaine and bupivacaine infusion into the interpleural space with an open pericardium. Experimental study. Six adult dogs. Systemic arterial pressure and electrocardiogram were recorded. A 7.5 Fr Swan-Ganz catheter was advanced to the level of the main pulmonary artery to record pulmonary arterial ...
Gebauer Corinna Mirjam - - 2006
OBJECTIVE: To assess changes in cardiac performance, with Doppler echocardiography, among newborns with hypoxic-ischemic encephalopathy during mild therapeutic hypothermia and during rewarming. METHODS: For 7 asphyxiated neonates (birth weight: 1840-3850 g; umbilical artery pH: 6.70-6.95) who received mild whole-body hypothermia, the following hemodynamic parameters were determined immediately before rewarming (33 ...
Casiglia Edoardo - - 2006
During hypnosis it is easy to induce hallucinations having, for the hypnotized subject, the characteristics and the concreteness of reality. This study was performed to put in evidence the physical effects of hypnotic suggestion of warm tub bathing. 18 volunteers screened for high hypnotizability were studied. They underwent suggestion of ...
Bajorat J - - 2006
BACKGROUND AND OBJECTIVE: Despite the introduction of various less-invasive concepts of cardiac output measurement, pulmonary arterial thermodilution is still the most common measurement technique. METHODS: This prospective controlled study was designed to compare different methods of cardiac output measurement simultaneously. Pulmonary arterial thermodilution, transpulmonary thermodilution (PiCCO), trans-oesophageal echo-Doppler probe (HemoSonic) ...
McMullen Julie R - - 2006
Growth of the heart can be induced by physiological stimuli (e.g. postnatal development or chronic exercise training: 'the athlete's heart') or pathological stimuli (e.g. pressure or volume overload). Physiological hypertrophy is characterized by the normal organization of sarcomeres and fibres, normal or enhanced cardiac function and a relatively normal pattern ...
Kroon Martijn - - 2005
OBJECTIVE: Pulse-dye densitometry (PDD) could be a suitable, low-invasive alternative to thermodilution using a pulmonary artery catheter (PAC) for monitoring cardiac output. The aim of our study was to assess the reproducibility and validity of PDD compared to PAC-thermodilution. METHODS: In 43 post-cardiac surgery patients, the mean of triplicate readings ...
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