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Pulse Contour Analysis (pulse + contour_analysis)

Distribution by Scientific Domains

Medical Sciences	100%

Selected Abstracts

Pulse contour analysis: should good-looking curves be trusted?

ACTA ANAESTHESIOLOGICA SCANDINAVICA, Issue 9 2006
P. G. Berthelsen
No abstract is available for this article. [source]

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]

Pulse pressure variation and stroke volume variation during different loading conditions in a paediatric animal model

ACTA ANAESTHESIOLOGICA SCANDINAVICA, Issue 3 2008
J. RENNER
Background: Previous studies in adult patients and animal models have demonstrated that pulse pressure variation (PPV) and stroke volume variation (SVV) can be used to predict the response to fluid administration. Currently, little information is available on the performance of these variables in infants and neonates. The aim of our study was to assess whether PPV and SVV can predict fluid responsiveness in an animal model and to investigate the influence of different tidal volumes applied. Methods: PPV and SVV were monitored by pulse contour analysis in 19 anaesthetized and paralysed piglets during ventilation with tidal volumes (VT) of 5, 10 and 15 ml/kg both before and after fluid loading with 25 ml/kg of hydroxy-ethyl starch 6% (HES). Cardiac output was measured by pulmonary artery thermodilution and a positive response to HES infusion was defined as ,20% increase in the stroke volume index (SVI). Results: Before HES infusion, PPV and SVV were significantly greater during ventilation with a VT of 10 and 15 ml/kg than during ventilation with a VT of 5 ml/kg (P<0.05). After HES infusion, only ventilation with VT 15 ml/kg resulted in a significant increase in PPV and SVV. As assessed by receiver operating characteristic curve analysis, SVV during ventilation with VT 10 ml/kg was the best predictor of a positive response to fluid loading (AUC=0.87). Conclusions: In this paediatric animal model, we found that SVV during ventilation with 10 ml/kg was a sensitive and specific predictor of the response to fluid loading. [source]

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

Cardiac Output Technologies with Special Reference to the Horse

JOURNAL OF VETERINARY INTERNAL MEDICINE, Issue 3 2003
Kevin T.T. Corley
Critical illness, anesthesia, primary cardiovascular disease, and exercise may result in marked hemodynamic alterations. Measuring cardiac output (CO) is central to defining these alterations for both clinician and researcher. In the past 10 years, several new methods of measuring CO have been developed for the human medical market. Some of these methods are now validated in the horse and are in clinical use. The Fick method has been used in equine research for more than a century. It depends on simultaneous measurement of mixed venous (pulmonary arterial) and peripheral arterial oxygen content and oxygen uptake by the lungs. The technique is technically demanding, which restricts its clinical use. Indicator dilution techniques, with indocyanine green, cold (thermodilution), or lithium as the marker, have also been widely used in the horse. The indocyanine technique is cumbersome, and thermodilution requires right heart catheterization, which is not a benign procedure, making both of these methods less than ideal for clinical use. Lithium dilution requires catheterization of a peripheral artery and a jugular vein. It has recently been validated in anesthetized adult horses and neonatal foals. Doppler echocardiography is a noninvasive ultrasound-based technique. More accurate measurements are obtained with transesophageal than with transthoracic measurements; however, both methods require considerable technical expertise. Bioimpedance and pulse contour analysis are 2 new methods that have yet to be validated in the horse. With the currently available technology, lithium dilution appears to be the method of measuring CO best suited to the equine clinic. [source]