Changes in high-frequency QRS components are more sensitive than ST-segment deviation for detecting acute coronary artery occlusion.
J Am Coll Cardiol
; 36(6): 1827-34, 2000 Nov 15.
Article
em En
| MEDLINE
| ID: mdl-11092652
ABSTRACT
OBJECTIVES:
This study describes changes in high-frequency QRS components (HF-QRS) during percutaneous transluminal coronary angioplasty (PTCA) and compares the ability of these changes in HF-QRS and ST-segment deviation in the standard 12-lead electrocardiogram (ECG) to detect acute coronary artery occlusion.BACKGROUND:
Previous studies have shown decreased HF-QRS in the frequency range of 150-250 Hz during acute myocardial ischemia. It would be important to know whether the high-frequency analysis could add information to that available from the ST segments in the standard ECG.METHODS:
The study population consisted of 52 patients undergoing prolonged balloon occlusion during PTCA. Signal-averaged electrocardiograms (SAECG) were recorded prior to and during the balloon inflation. The HF-QRS were determined within a bandwidth of 150-250 Hz in the preinflation and inflation SAECGs. The ST-segment deviation during inflation was determined in the standard frequency range.RESULTS:
The sensitivity for detecting acute coronary artery occlusion was 88% using the high-frequency method. In 71% of the patients there was ST elevation during inflation. If both ST elevation and depression were considered, the sensitivity was 79%. The sensitivity was significantly higher using the high-frequency method, p<0.002, compared with the assessment of ST elevation.CONCLUSIONS:
Acute coronary artery occlusion is detected with higher sensitivity using high-frequency QRS analysis compared with conventional assessment of ST segments. This result suggests that analysis of HF-QRS could provide an adjunctive tool with high sensitivity for detecting acute myocardial ischemia.
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Coleções:
01-internacional
Base de dados:
MEDLINE
Assunto principal:
Angioplastia Coronária com Balão
/
Doença das Coronárias
/
Eletrocardiografia
/
Sistema de Condução Cardíaco
Tipo de estudo:
Diagnostic_studies
Limite:
Adult
/
Aged
/
Female
/
Humans
/
Male
/
Middle aged
Idioma:
En
Revista:
J Am Coll Cardiol
Ano de publicação:
2000
Tipo de documento:
Article
País de afiliação:
Suécia