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Titolo:
KARHUNEN-LOEVE TRANSFORM AS A TOOL TO ANALYZE THE ST-SEGMENT - COMPARISON WITH QT INTERVAL
Autore:
LAGUNA P; MOODY GB; JANE R; CAMINAL P; MARK RG;
Indirizzi:
UNIV ZARAGOZA,CTR POLITECN SUPER,DEPT INGN ELECT ELECTR & COMUN,C MARIA LUNA 3 E-50015 ZARAGOZA SPAIN HARVARD UNIV,MIT,DIV HLTH SCI & TECHNOL CAMBRIDGE MA 00000 UNIV POLITECN CATALUNA,CSIC,INST CIBERNET BARCELONA SPAIN
Titolo Testata:
Journal of electrocardiology
, volume: 28, anno: 1995, supplemento:, S
pagine: 41 - 49
SICI:
0022-0736(1995)28:<41:KTAATT>2.0.ZU;2-O
Fonte:
ISI
Lingua:
ENG
Soggetto:
HIGH-RESOLUTION; LATE POTENTIALS; ALGORITHM; ECG; RECORDINGS; DEATH;
Keywords:
ECG ANALYSIS; ST-SEGMENT; KARHUNEN-LOEVE TRANSFORM; ST-T COMPLEX; ISCHEMIA;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Science Citation Index Expanded
Citazioni:
26
Recensione:
Indirizzi per estratti:
Citazione:
P. Laguna et al., "KARHUNEN-LOEVE TRANSFORM AS A TOOL TO ANALYZE THE ST-SEGMENT - COMPARISON WITH QT INTERVAL", Journal of electrocardiology, 28, 1995, pp. 41-49

Abstract

The spatial and temporal courses of ventricular repolarization are quite sensitive to the biochemical and biophysiologic environment of themyocardial cells, and are therefore often an early marker of heart disease, particularly of ischemia. The detailed morphology of the surface electrocardiogram contains considerable information about the repolarization process. The ST-segment changes with ischemia, injury, and drugs. The QT interval is affected by drugs, heart rate, and autonomic tone, and in some situations may identify individuals at high risk for arrhythmias and sudden death. Variability in the shape, including duration, of the ST-T waves reflects autonomic nervous system activity andmay identify high-risk patients. Automated methods for quantitativelycharacterizing ST-T complexes are important in studying long-term electrocardiographic records. Two computer-based measurement procedures for characrerizing the repolarization period were comparatively analyzed: Karhunen-Loeve (KL) transform representation of the ST-T shape and measurement of beat-to-beal durations of repolarization (QT intervals). The results of KL transform representation and time-domain QT measurement algorithms for studying the repolarization period of the electrocardiogram on the European ST-T database are presented. II was found that about 20% of the records present a quasiperiodic KL pattern of ischemic ST-T activity and another 20% exhibit repetitive but not clearlyperiodic patterns of ischemic ST-T changes. From these ischemic records, 50% showed QT variations in at least one lead associated with the ischemic episodes.

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 12/07/20 alle ore 06:29:05