Conference proceedings : ... Annual International Conference of the IEEE Engineering in Medicine and Biology Society. IEEE Engineering in Medicine and Biology Society. Annual Conference
-
Conf Proc IEEE Eng Med Biol Soc · Jan 2007
Comparative StudyA comparative evaluation between conditions of the wrist band capacitively-coupled ECG recording through signal-to-noise ratio.
The purpose of this study is to evaluate the performance to measure ECG recording based on signal-to-noise ratio of ECG signals recorded with three types of electrodes in four experimental conditions for discussion on appropriate form of the electrodes. The wrist band shaped capacitively-coupled electrodes have been developed. We evaluated the signal-to-noise ratios with statistical methods when the reference and the properties of the electrodes were substituted. From our results, it is indicated that not only performance of the electrodes themselves but also stabilization of electrodes around skin are important for steady ECG recording.
-
Conf Proc IEEE Eng Med Biol Soc · Jan 2007
Diagnosis of hemorrhage in a prehospital trauma population using linear and nonlinear multiparameter analysis of vital signs.
In this study, we analyzed a dataset of time-series vital-signs data collected by standard Propaq travel monitor during helicopter transport of 898 civilian trauma casualties from the scene of injury to a receiving trauma center. The goals of the analysis are two fold. First, to determine which combination of the automatically-collected and -qualified vital signs provides the best discrimination between casualties with and without major hemorrhage. ⋯ We randomly selected a subset of the casualties to train and test the classifiers with multiple combinations of the vital-signs variables, and used the area under the receiver operating characteristic curve (ROC AUC) as a decision metric. Based on the results of 100 simulations, we observe that: (i) the best two features obtained are systolic blood pressure and heart rate (mean AUC = 0.75 from a linear classifier), and (ii) the use of nonlinear classifiers does not improve discrimination. These results support earlier findings that the interaction of systolic blood pressure and heart rate is useful for the identification of trauma hemorrhage and that linear classifiers are adequate for many real-world applications.
-
Conf Proc IEEE Eng Med Biol Soc · Jan 2007
Stroke volume estimation by thoracocardiography is better when glottis is closed.
Thoracocardiography approach pretends to non-invasively monitor stroke volume by inductive plethysmographic recording of ventricular volume curves by a transducer placed on the chest. The purpose of this study was to investigate the potential of thoracocardiography to estimate stroke volumes while apnea with open glottis. We hypothesized that, when glottis is open, stroke volumes would be better estimated if airways flow curves were taken into account.
-
Conf Proc IEEE Eng Med Biol Soc · Jan 2007
Additive and multiplicative noise reduction by back propagation neural network.
A novel filter is proposed by applying back propagation neural network (BPNN) ensemble where the noisy signal and the reference one are the same. The neural network(NN) ensemble filter not only well reduces additive and multiplicative white noise inside signals, but also preserves signals' characteristics. ⋯ Furthermore, it is presented of the relationship between noise reduction and bandwidth of noises. The performance of the NN ensemble filter is demonstrated in computer simulations and actual electroencephalogram (EEG) signals processing.
-
Conf Proc IEEE Eng Med Biol Soc · Jan 2007
Fluid resuscitation: computer simulation and animal experiments.
The purpose of this study was to investigate the hemodynamic system in hemorrhagic shock and to estimate the effects of different infusion fluids and rates on the recovery of the bleeding patient. A mathematical model of the hemodynamic system was developed including fluid transfer to and from the interstitium for different types of fluids. ⋯ The computer simulation followed successfully experimental data collected in five different experiments. Thus, it may now serve as an advanced tool for evaluating and analyzing effects of different fluids and optimize fluid regimen.