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- W2084329810 abstract "This study compared 2-mL bolus thermodilution cardiac output measurements with standard 10-mL bolus measurements.Cardiac output was measured with the new 2-mL bolus technique and the 10-mL standard thermodilution technique in a perspective series. We describe a system that automatically cools and injects 2-mL boluses of saline into a standard pulmonary artery catheter. It uses a Peltier effect solid-state cooler and pneumatically driven syringe injector to measure cardiac output once per minute.Animal laboratory.Eight adult Duroc swine weighing between 38.0 and 57.5 kg.Once each minute, 2 mL of cooled 5% dextrose was injected through the pulmonary catheter. Once every 8 mins, four sequential measurements of cardiac output were made using 10-mL injections.A total of 1249 paired waveforms were processed with both a conventional algorithm and with a neural network. For the conventional algorithm, the correlation coefficient was r2 = .92 and the SD of the difference was 1.30 L/min. For the neural network, the correlation coefficient was r2 = .94 and the SD of the difference was 0.88 L/min. Output filtering improved the results in both cases.Neural networks accurately derive cardiac output from 2-mL bolus thermodilution injections, allowing cardiac output to be monitored automatically once per minute in many patients. The technique is convenient and uses standard low-cost catheters." @default.
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- W2084329810 date "1999-08-01" @default.
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- W2084329810 title "Semicontinuous cardiac output monitoring using a neural network" @default.
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- W2084329810 doi "https://doi.org/10.1097/00003246-199908000-00018" @default.
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