[Association of various cardiac parameters and signal-averaged electrocardiographic late potentials in patients with myocardial infarction].
After the amplification and filtration of the surface ECG, late potential signal (LP) in QRS termination was determined. Subjects were 52 patients who experienced acute myocardial infarction within 5 years and measurement was undertaken 70 times. 271 pulses (average) were measured using the Model 101 PC system (ART Co, Ltd) with 40-250 Hz filter. Relationship of LPs and ventricular tachyarrhythmia, LPs and left ventricular function were studied according to the ejection fraction (EF) of left ventricle (= index of left ventricular function) and maximum value of CPK (CPKmax) in acute phase. The patients with bundle branch block, atrial fibrillation and noise above 1.0 microV were excluded.


RESULTS
(1) Higher incidence of LP was shown in patients with triplet or more runs of ventricular tachycardias. (2) Higher incidence of LP was shown in patients with lower EF and higher CPKmax. Above results showed that non-invasive and simple recording of LPs in patients with myocardial infarction was useful in the discrimination of the patients with ventricular arrhythmia and presumption of left ventricular function.
Miura
M
M
Okabe
S
S
Kimura
M
M
Takahashi
T
T
Tsuburaya
T
T
Watanabe
H
H
Hosoya
K
K
Hayashi
M
M
D000328:Adult; D000368:Aged; D000369:Aged, 80 and over; D001145:Arrhythmias, Cardiac / Q000503:physiopathology; D004562:Electrocardiography; D005260:Female; D006801:Humans; D008297:Male; D008875:Middle Aged; D009203:Myocardial Infarction / Q000503:physiopathology*; D013318:Stroke Volume