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Correlation of the Endocardial Fragmented Electrogram with Body Surface Signal‐Averaged Electrocardiographic Mapping
Author(s) -
SASAKI YASUYUKI,
FURIHATA AKIKO,
SUYAMA KAZUHIRO
Publication year - 1994
Publication title -
pacing and clinical electrophysiology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.686
H-Index - 101
eISSN - 1540-8159
pISSN - 0147-8389
DOI - 10.1111/j.1540-8159.1994.tb01512.x
Subject(s) - qrs complex , medicine , ventricle , electrocardiography , cardiology , signal averaged electrocardiogram , root mean square , body surface , mathematics , physics , geometry , quantum mechanics
We compared signal‐averaged electrocardiography (SAE), SAE mapping, and left ventricular catheter mapping in 60 patients with ischemic heart disease. Using the data obtained in patients with no fragmented electrograms (EE) in the left ventricle, the late potential was defined by SAE as a filtered QRS duration > 131 msec or a root mean square voltage < 16 μV for the last 40 msec of the QRS complex. SAE mapping was performed by recording the signal‐averaged electrocardiogram at 48 sites on the body surface. With SAE mapping, the filtered QRS duration and the area in the last 20 msec of the QRS complex were significantly different between the patients with and without EEs. The late potential was defined by SAE mapping as a filtered QRS duration > 136 msec or an area < 28 μV.msec for the last 20 msec of the QRS complex. The sensitivity and specificity of detecting FEs were 46% and 88%, respectively, by the SAE filtered QRS criterion, while they were 66% and 88% by the root mean square criterion. In contrast, SAE mapping gave values of 66% and 92% by the filtered QRS criterion, as well as values of 100% and 92% by the area criterion. Thus, SAE mapping provided better detection of the EE and was more closely correlated with the results of catheter mapping, suggesting its potential for clinical application.