cardiac muscle and cardiac output

... thoracic bioimpedance and the thoracic fluid index (or total thoracic impedance) Cardiac output is then calculated from the product of heart rate and stroke volume, averaged over 16 cardiac cycles We ... method of cardiac output measurement for this group of patients The thermodilution method is an indirect measure of cardiac output, but has been shown to correlate well with the gold standard dye ... (measured by the mean) and precision (± 2SD) are shown Barry et al Critical Care 1997, 1:71 http://ccforum.com cardiac output in patients in the ICU and upon which much of our understanding of the cardiovascular...

Ngày tải lên: 12/08/2014, 18:20

... and height (CardioQ, Deltex Medical Ltd; and Waki, Atys Medical) Systematic errors due to a discrepancy between the actual area and the estimated value would not affect the trend of cardiac output ... before acquiring and interpreting Doppler-derived data Failure to reposition the probe before each measurement may lead to grossly erroneous cardiac output values Validation of cardiac output measurement ... paired cardiac output measurements using thermodilution and oesophageal Doppler In addition, simultaneous suprasternal Doppler and indirect calorimetry (Fick principle) were used to measure cardiac...

Ngày tải lên: 12/08/2014, 18:21

... Comparison of cardiac output determined using the thermodilution method (QTTHERM) and cardiac output determined using the metabolic (Fick) method (QTFICK) according to (a) the Bland and Altman graphic ... high cardiac output values QTFick (l/min) 0 10 11 12 QTTherm (l/min) Passing and Bablok regression of cardiac output determined using the metabolic (Fick) method (QTFICK) against cardiac output ... Comparison of cardiac output determined using the metabolic (Fick) method (QTFICK) and cardiac output determined using the thermodilution method (QTTHERM) according to (a) the Bland and Altman graphic...

Ngày tải lên: 12/08/2014, 19:21

... return and cardiac output (a) Theoretical effects of PEEP on venous return (VR) and cardiac output (CO) PEEP causes an increase in intrathoracic pressure (ITP) and a right shift in the cardiac ... the cardiac function (Frank-Starling) and venous return curves [8] Thus, for any given set of cardiac function and venous return curves there exists only one combination of RAP and cardiac output ... return and the outflow pressure for the circuit, which is right atrial pressure (RAP) RAP is controlled by cardiac function and the interaction of cardiac function and circuit function determine cardiac...

Ngày tải lên: 12/08/2014, 23:20

... Vigileo™ CO = cardiac output; SD = standard deviation Accuracy and precision After selection, 33 periods of very stable CO (PAC-CCO slope > 10%, SD/mean < 20%, representing 4133 points and 34% of ... identity line) and Vigileo™ (in black, r = 0,69, P < 0.05 from identity line) with PAC-CCO during periods of very stable cardiac output (CO) (Right panel) Corresponding Bland and Altman representation: ... blood gases and considering the hemoglobin blood level as normal and stable, VO2 is a direct function of only three variables: cardiac output (CO), arterial oxygen saturation (SaO2), and mixed...

Ngày tải lên: 13/08/2014, 16:20

... (which is independent of compliance and resistance) is added to the formula, which computes the pulse-contour cardiac output [7] This estimation of cardiac output from the pulse-contour analysis ... cardiac output Crit Care 2009, 13:201 doi: 10.1186/cc9058 Cite this article as: Monnet et al., Arterial pressure-based cardiac output in septic patients: different accuracy of pulse contour and ... estimation of stroke volume and cardiac output The PiCCO device calculates stroke volume by measuring the area under the systolic portion of the arterial-pressure curve and dividing it by the aortic...

Ngày tải lên: 13/08/2014, 20:22

... septic-shock patients is able to increase cardiac output • The increase in cardiac output with norepinephrine seems to be related to increases in both cardiac preload and cardiac contractility • These positive ... pressure is also able to increase cardiac output through increases in cardiac preload and contractility Such a beneficial effect remained significant in patients with poor cardiac contractility, except ... participated in study design and in data collection and interpretation, performed the statistical analysis, and drafted the manuscript JFG, XM, HK, and JM participated in study design and data collection...

Ngày tải lên: 13/08/2014, 21:21

... purposes) Theoretical Biology and Medical Modelling 2005, 2:5 http://www.tbiomed.com/content/2/1/5 Figure Muscle and Smooth Muscle Cardiac Cardiac Muscle and Smooth Muscle Circuit diagram used ... (Fig 2B for cardiac muscle and D for smooth muscle) A slightly lower current intensity failed to produce a stable repolarization of cell A5 (Fig 2A for cardiac muscle and 2C for smooth muscle) Note ... resistance of K+ compared to Na+ (cardiac muscle) or Ca++ (smooth muscle) were set to give resting potentials (RPs) of -80 mV for cardiac muscle and -55 mV for smooth muscle During excitation, the...

Ngày tải lên: 13/08/2014, 22:22

... PAC-derived estimates of cardiac output by the thermodilution technique are not the gold standard for estimating cardiac output at the bedside, all available measures of cardiac output need to be compared ... PiCCO Plus and FloTrac) (Edwards Lifesciences, Irvine, CA, USA) and two PAC thermodilution techniques: CO by thermodilution (COtd) and continuous cardiac output (CCO) in postoperative cardiac surgery ... arterial pressurederived estimates of cardiac output give differing degrees of error relative to each other • The cardiac output error among devices is low for cardiac output values < L/min • Studies...

Ngày tải lên: 14/08/2014, 07:21

... actual and preceding calibration; APACHE II: Acute Physiology and Chronic Health Evaluation II score; CI: cardiac index; CO: cardiac output; COTCP: transcardiopulmonary thermodilution cardiac output; ... for pulse contour-derived cardiac output (PCCO) and transcardiopulmonary thermodilution cardiac output (COTCP); npatient, number of patients; mean, mean of all PCCO and COTCP measurements bInterchangeability ... http://ccforum.com/content/15/1/R22 Page of Figure Bland-Altman plots of different norepinephrine (NE) subgroups PCCO, pulse contour cardiac output; COTCP, transcardiopulmonary thermodilution cardiac output; PE, percentage...

Ngày tải lên: 14/08/2014, 07:21

... cardiology and random walk and lognormal distributions,” Acta Physiol Pharmacol Neerl., vol 14, pp 175–204, 1966 [19] R K Mallard, Indicator-Dilution Dispersion Models and Cardiac Output Computing ... ultrasound systems and transducers,” U.S Department of Health and Human Services, Food and Drug Videodensitometric Methods for Cardiac Output Measurements Administration, Center for Devices and Radiological ... P2 , and P3 are the parameters to be optimized, x1 and x2 are the variables of the linearized model, and t0 is the estimate of t0 The least squares estimation of the parameters P1 , P2 , and...

Ngày tải lên: 23/06/2014, 01:20

... runs, give cardiac output values that may vary by up to 25% at low cardiac outputs (

Ngày tải lên: 12/08/2014, 19:22

... inadequate cardiac output? LOW adequate cardiac output? LOW OUTPUT SYNDROME (hypervolemia, heart failure pulmonary embolism ) Influence of sepsis mediators on the relationship between oxygen uptake and ... SvO2 is a global parameter and gives no specific regional information, but neither does cardiac output; in fact, it may be interesting to combine SvO2 and cardiac output (Fig 2) Indeed, this ... the blood returns to the right heart and hence gives a measure of the balance between DO2 and VO2, thus providing an indication of the ability of the cardiac output to meet the individual’s oxygenation...

Ngày tải lên: 12/08/2014, 19:22

... achieved high CI and DO2 with the subgroup of control patients with normal or low CI and DO2 (thus excluding protocol patients with low CI and DO2 and control patients with high CI and DO2); they ... MAP, urine output, and creatinine and osmolar clearance, without an associated increase in CI [26] Martin and coworkers [27] found that norepinephrine significantly increased both MAP and DO2 in ... reserves and prognosis, and were incapable of achieving the target values Thus, the overwhelming evidence from randomized controlled trials does not support the hypothesis that maintaining high CO and...

Ngày tải lên: 12/08/2014, 19:22

... dilution cardiac output as a technique for measurement of cardiac output in dogs Am J Vet Res 2001, 62:1255-1261 Linton RA, Jonas MM, Tibby SM, Murdoch IA, O’Brien TK, Linton NW, Band DM: Cardiac output ... stroke volume variation, stroke volume and cardiac output in volume resuscitation as compared with current parameters (end-diastolic volume index, cardiac output, cardiac index) in a trauma setting; ... necessary, and recalibration may be required Because cardiac output is estimated every cardiac cycle, atrial fibrillation, and occasionally other arrhythmias, may result in irregular data output, ...

Ngày tải lên: 12/08/2014, 20:20

... pulmonary artery catheter thermodilution cardiac output; COTranspulm, aortic transpulmonary thermodilution cardiac output; COWave, uncalibrated pulse contour cardiac output; CVP, central venous pressure; ... measurement catheter thermodilution cardiac output; COTranspulm, aortic transpulmonary thermodilution cardiac output; COWave, uncalibrated pulse contour cardiac output; CPB, cardiopulmonary bypass; ... measurements prior to surgery and prior to CPB, prior to CPB and admission to the ICU, and between admission to the ICU and six hours later were, for COPAC, 1.2 (1.5), -0.2 (1.8), and 0.3 (1.4), respectively...

Ngày tải lên: 13/08/2014, 03:20

... difference in cardiac output as a function of mean cardiac output Mean difference in cardiac output, measured by arterial pressure-based carmean cardiac output diac output (APCO) and intermittent ... Figure Change in cardiac output The change in cardiac output (ΔCO) measoutput ured by intermittent thermodilution cardiac output (ICO) and by either arterial pressure-based cardiac output (APCO) ... APCO and ICO values and the difference between CCO and ICO values were determined for each set of cardiac output measurements The mean and standard deviation of the difference between cardiac output...

Ngày tải lên: 13/08/2014, 08:20

... (continuous cardiac output [CCO] and APCO) track dynamic change in cardiac output utilizing ICO as a reference in a remarkably similar fashion Although the absolute magnitude of cardiac output change ... Care Vol 12 No Lemson and van der Hoeven decisions on cardiac output changes of 10% to 15% likely results in unnecessary hemodynamic manipulation of unknown clinical impact and we would strongly ... ±30% (96% of the time for APCO and 95% of the time for CCO using this well accepted technology) Breukers and colleagues [5] found concordance of delta cardiac output in 75% of determinations...

Ngày tải lên: 13/08/2014, 08:21

... with cardiac failure to increase myocardial contractility and hence cardiac output Indeed, in the short-term, acute phase of heart failure, inotropic drugs can be useful to increase cardiac output ... interpretation of cardiac output is not as straightforward as it may seem at first glance Comparing the complex relationship of cardiac output and its four components with the speed of a bicycle and its ... therefore equals cardiac output, whereas preload is only one component of cardiac output Afterload Afterload is the force against which the ventricles must act in order to eject blood, and is largely...

Ngày tải lên: 13/08/2014, 11:22

... Distribution and bias cardiac output methods Distribution and bias ofof cardiac output methods (a) Cardiac output (CO) measured by the different CO methods at each experimental step (b) Bias and precision ... Scatter plots and Bland–Altman plots pooled data pairs Scatter plots and Bland–Altman plots of of pooled data pairs Scatter plots (left-hand side) and Bland–Altman plots (right-hand side) of pooled ... between (a) and (b) bolus transcardiopulmonary thermodilution cardiac output (COTCP) and continuous cardiac output by pulse power analysis (PulseCO; LiDCO system), (c) and (d) between COTCP and continuous...

Ngày tải lên: 13/08/2014, 11:23