[Left bundle branch block analysis by body surface mapping. Comparison with electrocardiographic and vectocardiographic findings].
OBJECTIVE
To compare the correlation between the departure areas (DA), negative or positive, in patients whose electrocardiogram showed left bundle branch block (LBBB) and association with left ventricular hipertrophy (LVH) and myocardial infarction (MI), to the electrocardiographic (ECG) and vectocardiographic (VCG) classic criteria.


METHODS
The study was carried out with 46 patients (27 males) with LBBB. These patients had hypertension (19.5%), coronary heart disease (34.7%) and 21 patients with no heart disease (45.8%).


RESULTS
The statistic analysis using the Cluster method divided the patients in two groups. Group I (22 patients) showed an average rate for the DA (-2 SD) of 1091 for QRS and of 640 for ST-T. For the DA (+2 SD), the average rate was 618 for QRS and 881 for ST-T; group II (24 patients) showed an averaged for the DA (-2 SD) of 1063 for QRS and of 225 for ST-T. For the DA (+2 SD), the averaged rate was 428 for QRS and 600 for ST-T.


CONCLUSIONS
In general the current ECG/VCG findings, can not differentiate the presence of the association of LBBB to LVH and MI. The DA of ST-T, mainly negative was the most efficient to separate the two groups and help in the differential diagnosis.
Pastore
C A
CA
Instituto do Coração do Hospital das Clínicas, FMUSP.
Moffa
P J
PJ
Tobias
N M
NM
de Moraes
A P
AP
Kaiser
E
E
Cuoco
M A
MA
Mansur
A
A
Granado
G
G
Sanchez
M del C
Mdel C
Bellotti
G
G
Pileggi
F
F
D000328:Adult; D000368:Aged; D000369:Aged, 80 and over; D018780:Body Surface Potential Mapping; D002037:Bundle-Branch Block / Q000175:diagnosis*; D016009:Chi-Square Distribution; D003937:Diagnosis, Differential; D004562:Electrocardiography; D005260:Female; D006801:Humans; D008297:Male; D008875:Middle Aged; D012680:Sensitivity and Specificity; D014672:Vectorcardiography; D016277:Ventricular Function, Left