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Clinical use of body surface potential mapping in cardiac arrhythmias.
Luigi De Ambroggi,
Alexandru D Corlan,
Anadolu Kardiyol Derg 7 Suppl 1:8-10, 2007
ABSTRACT
The electrocardiology and specifically body surface potential maps
(BSPM) have two main objectives in the arrhythmologic field: 1) identification
of signs of susceptibility to arrhythmias and 2) identification
of site of origin of the arrhythmias. In order to detect the susceptibility
to ventricular arrhythmias maps were recorded with different lead
systems by different authors and in particular various methods
of analysis of BSPM have been used to study repolarization potentials:
QRST integral maps eigenvector analysis principal component analysis
autocorrelation analysis. From these analyses several markers of
vulnerability to arrhythmias were identified which demonstrated
a predictive accuracy of various degree in selected patient populations.
As concerns the identification of site of origin of the arrhythmias
the use of 62 leads BSPMs during endocardial pace mapping technique
enabled more precise identification of the site of origin of postinfarction
ventricular tachycardia episodes compared with the use of the 12-lead
electrocardiography (ECG). Recently a new electrocardiographic modality
(ECG-imaging) enabled to compute non-invasively and with high resolution
epicardial potential distribution and epicardial activation sequences
from potentials recorded on the body surface together with cardiac
computed tomography images. The ECG-imaging has been successfully
applied in humans using geometrical information from computed tomography
of each subject in different heart conditions: normal heart heart
with a conduction disorder focal activation initiated by right or
left ventricular pacing focal ventricular tachycardia and atrial
flutter.
[Medline]