At presentation, NLS patients showed higher BP levels than LS patients. Moderate reductions in BP during the first week after admission were associated with short-term functional improvement in patients with acute ischemic stroke.
Recently developed techniques allow the analysis of surface EMG in multiple locations over the skin surface (high-density surface electromyography, HDsEMG). The detected signal includes information from a greater proportion of the muscle of interest than conventional clinical EMG. However, recording with many electrodes simultaneously often implies bad-contacts, which introduce large power-line interference in the corresponding channels, and short-circuits that cause near-zero single differential signals when using gel. Such signals are called 'outliers' in data mining. In this work, outlier detection (focusing on bad contacts) is discussed for monopolar HDsEMG signals and a new method is proposed to identify 'bad' channels. The overall performance of this method was tested using the agreement rate against three experts' opinions. Three other outlier detection methods were used for comparison. The training and test sets for such methods were selected from HDsEMG signals recorded in Triceps and Biceps Brachii in the upper arm and Brachioradialis, Anconeus, and Pronator Teres in the forearm. The sensitivity and specificity of this algorithm were, respectively, 96.9 ± 6.2 and 96.4 ± 2.5 in percent in the test set (signals registered with twenty 2D electrode arrays corresponding to a total of 2322 channels), showing that this method is promising.
ObjectiveThe aim of this pilot study was to evaluate the feasibility of surface
electromyographic signal derived indexes for the prediction of weaning
outcomes among mechanically ventilated subjects after cardiac surgery.MethodsA sample of 10 postsurgical adult subjects who received cardiovascular
surgery that did not meet the criteria for early extubation were included.
Surface electromyographic signals from diaphragm and ventilatory variables
were recorded during the weaning process, with the moment determined by the
medical staff according to their expertise. Several indexes of respiratory
muscle expenditure from surface electromyography using linear and non-linear
processing techniques were evaluated. Two groups were compared: successfully
and unsuccessfully weaned patients.ResultsThe obtained indexes allow estimation of the diaphragm activity of each
subject, showing a correlation between high expenditure and weaning test
failure.ConclusionSurface electromyography is becoming a promising procedure for assessing the
state of mechanically ventilated patients, even in complex situations such
as those that involve a patient after cardiovascular surgery.
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