Title :
ECG-based detection of body position changes using a Laplacian noise model
Author :
Mincholé, Ana ; Sörnmo, Leif ; Laguna, Pablo
Author_Institution :
CIBER-BBN, Univ. de Zaragoza, Zaragoza, Spain
fDate :
Aug. 30 2011-Sept. 3 2011
Abstract :
Body position changes (BPC), which are often manifested in the ECG as shifts in the electrical axis of the heart, result in ST changes, and thus, may be misclassified as ischemic events during ambulatory monitoring. We have developed a BPC detector by modeling shifts as changes in the Karhunen-Loève transform coefficients of the QRS complex and the ST-T waveform. The noise is assumed to have a Laplacian distribution. A generalized likelihood ratio test has been chosen as the strategy to detect BPCs. Two different databases have been used to assess detection performance. The obtained results were 93%/99% in terms of sensitivity/positive predictivity value (S/+PV) and a false alarm rate of 2 events/hour. The results clearly outperform current techniques (S/+PV: 85%/99%) based on the Gaussian noise assumption.
Keywords :
Gaussian noise; electrocardiography; BPC detector; ECG based detection; Gaussian noise assumption; Karhunen-Loève transform coefficient; Laplacian noise model; QRS complex; ST-T waveform; ambulatory monitoring; body position change; generalized likelihood ratio test; heart electrical axis; ischemic event; Databases; Detectors; Electrocardiography; Laplace equations; Monitoring; Signal to noise ratio; Adult; Algorithms; Electrocardiography; Electrocardiography, Ambulatory; Equipment Design; False Positive Reactions; Female; Heart Rate; Humans; Male; Models, Statistical; Motion; Normal Distribution; Posture; Predictive Value of Tests; Reproducibility of Results; Sensitivity and Specificity; Signal Processing, Computer-Assisted; Signal-To-Noise Ratio;
Conference_Titel :
Engineering in Medicine and Biology Society, EMBC, 2011 Annual International Conference of the IEEE
Conference_Location :
Boston, MA
Print_ISBN :
978-1-4244-4121-1
Electronic_ISBN :
1557-170X
DOI :
10.1109/IEMBS.2011.6091752