[The prognostic significance of late potentials in patients with chronic coronary disease].
OBJECTIVE
The prognostic value of late potentials (LP) in the subacute phase of myocardial infarction (MI) is well known, but its prognostic value in long-standing coronary disease (LSCD) has not yet been established. In a population with LSCD we searched for a relation between the presence of LP in signal-averaged ECG (SAECG) performed before cardiac catheterization, and the incidence of cardiac events.


METHODS
Based on our department's casuistics, we selected 50 consecutive patients with coronary disease confirmed by an angiogram and LP, and a control group without LP, in SAECG. We selected 91 men and nine women with an average age of 59 +/- 8 years. None of the patients had had ischemic events or revascularization procedures, in the 3 month period before catheterization. The follow-up was made between the time of the SAECG and the last medical visit. The events recorded were: ventricular arrhythmia, cardiac death, coronary angioplasty, coronary artery by-pass graft, MI or unstable angina.


RESULTS
During a follow-up period of 20.1 +/- 8 months, we found no statistically significant difference between the two groups, regarding the incidence of such events. However, there was a higher incidence of ventricular arrhythmic events in the group with LP (four patients with ventricular tachycardia against none in the control group). All patients with ventricular tachycardia had had a previous MI.


CONCLUSIONS
In this study, the presence of LP in SAECG did not have the same prognostic value found in the subacute phase of MI, but a higher incidence of arrhythmic events was observed in the group with LP and a previous MI.
Almeida
M
M
Serviço de Cardiologia, Hospital de Santa Cruz, Carnaxide, Portugal.
Ferreira
J
J
Bronze
L
L
Trabulo
M
M
Brízida
L
L
Morgado
F
F
Adragão
P
P
Bonhorst
D
D
Seabra-Gomes
R
R
D000328:Adult; D000368:Aged; D001145:Arrhythmias, Cardiac / Q000453:epidemiology / Q000209:etiology; D006328:Cardiac Catheterization; D002908:Chronic Disease; D003327:Coronary Disease / Q000150:complications / Q000175:diagnosis* / Q000401:mortality; D004562:Electrocardiography; D005260:Female; D005500:Follow-Up Studies; D006801:Humans; D015994:Incidence; D008297:Male; D008564:Membrane Potentials; D008875:Middle Aged; D011379:Prognosis; D012815:Signal Processing, Computer-Assisted