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Output Determination (output + determination)

Distribution by Scientific Domains
Medical Sciences100%

Kinds of Output Determination

  • cardiac output determination
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    Selected Abstracts

    USE OF LITHIUM DILUTION AND PULSE CONTOUR ANALYSIS CARDIAC OUTPUT DETERMINATION IN ANAESTHETISED HORSES , A CLINICAL EVALUATION

    JOURNAL OF VETERINARY EMERGENCY AND CRITICAL CARE, Issue S1 2004
    Gayle D Hallowell
    Pulse contour analysis is a relatively new method of continuously monitoring cardiac output. The objective of this study was to evaluate the suitability of the human algorithm for calculation of continuous cardiac output from the pulse waveform, for use in anaesthetised horses. Cardiac output was measured in 27 anaesthetised clinical cases comparing lithium dilution (LiDCO) with a preceding, calibrated cardiac output measured from the pulse waveform (PulseCO) using a commercial system (LiDCOplus, LiDCO Ltd., Cambridge, UK). These comparisons were repeated every 20,30 min. Positive inotropes or vasopressors were administered when clinically indicated. Cardiac output values obtained ranged from 15.2,52.2 L/min, with cardiac indices from 30.7,114.9 ml/kg/min. Eighty-nine comparisons were obtained. The mean bias was 0.24 ml/kg/min +/,6.48 ml/kg/min. The limits of agreement were ,12.72,13.2 ml/kg/min. The 95% confidence interval for the upper limit of agreement was 12.07,14.33 ml/kg/min and for the lower limit of agreement was ,11.59,13.85 ml/kg/min. Linear regression analysis demonstrated a correlation coefficient (r2) of 0.89 and produced an equation of PulseCO (mls kg,1 minute,1)=0.9226LiDCO (mls kg,1minute,1) +5.354. This method of pulse contour analysis is a relatively non-invasive and reliable way of monitoring continuous cardiac output in the horse under anaesthesia. The ability to easily continuously monitor cardiac output may improve morbidity and mortality in the anaesthetised horse. [source]

    Comparison of Impedance Cardiography to Direct Fick and Thermodilution Cardiac Output Determination in Pulmonary Arterial Hypertension

    CONGESTIVE HEART FAILURE, Issue 2004
    Gordon L. Yung MD
    Cardiac output (CO) is an important diagnostic and prognostic tool for patients with ventricular dysfunction. Pulmonary hypertension patients undergo invasive right heart catheterization to determine pulmonary vascular and cardiac hemodynamics. Thermodilution (TD) and direct Fick method are the most common methods of CO determination but are costly and may be associated with complications. The latest generation of impedance cardiography (ICG) provides noninvasive estimation of CO and is now validated. The purpose of this study was to compare ICG measurement of CO to TD and direct Fick in pulmonary hypertension patients. Thirty-nine enrolled patients were analyzed: 44% were male and average age was 50.8±17.4 years. Results for bias and precision of cardiac index were as follows: ICG vs. Fick (,0.13 L/min/m2 and 0.46 L/min/m2), TD vs. Fick (0.10 L/min/m2 and 0.41 L/min/m2), ICG vs. TD (respectively, with a 95% level of agreement between ,0.72 and 0.92 L/min/m2; CO correlation of ICG vs. Fick, TD vs. Fick, and ICG vs. TD was 0.84, 0.89, and 0.80, respectively). ICG provides an accurate, useful, and cost-effective method for determining CO in pulmonary hypertension patients, and is a potential tool for following responses to therapeutic interventions. [source]

    Comparison of the USCOM ultrasound cardiac output monitor with pulmonary artery catheter thermodilution in patients undergoing liver transplantation,

    LIVER TRANSPLANTATION, Issue 7 2008
    Lai-Sze Grace Wong
    The aim of the study was to compare the standard technique of cardiac output determination by pulmonary artery catheter thermodilution (PAC-TD) with a noninvasive ultrasound Doppler monitor (USCOM Pty., Ltd., Coffs Harbour, Australia) in surgery for liver transplantation. We wished to determine if the degree of accuracy would allow the ultrasound cardiac output monitor (USCOM) to be used as an alternative monitor in a clinical setting in which wide fluctuations in cardiac output could be expected. This was a prospective method comparison study, with 71 paired measurements obtained in 12 patients undergoing liver transplantation in a university teaching hospital. Bland-Altman analysis of the 2 techniques showed a bias of 0.39 L/minute, with the USCOM cardiac output lower compared with that of PAC-TD. The bias was small and did not vary with the magnitude of the cardiac output. The 95% limits of agreement were ,1.47 and 2.25 L/minute. There was good repeatability for USCOM measurements, with a repeatability coefficient of 0.43 for USCOM versus 0.77 for PAC-TD. We conclude that USCOM is acceptable for the clinical determination of noninvasive cardiac output, particularly in situations in which tracking changes over time is more important than knowing the precise value. However, the utility of USCOM is limited by its inability to measure pulmonary artery pressure. Liver Transpl 14:1038,1043, 2008. © 2008 AASLD. [source]

    Cardiac output determination using compliance

    ANAESTHESIA, Issue 11 2002
    D. I. Campbell
    No abstract is available for this article. [source]