[Follow-up of late potentials and complex tachycardiac arrhythmias following myocardial infarct over a 2-year period].
50 patients (mean age 53.8 +/- 9.2 years) were studied at 1.5 to 2 months (U1), 12 months (U2) and 24 months (U3) after acute myocardial infarction. Late potentials were registered at the body surface using the signal-averaging technique and a digital Butterworth filter with high pass cut-off frequencies DC, 25, 50, 100 Hz and a low pass cut-off frequency 300 Hz, 18 db/octave, and a 24-hour ECG was recorded. All patients underwent coronary angiography at U1. Late potentials were found at least once during the observation period in 56% of patients, and 18% of patients demonstrated late potentials at all three examinations but up to 38% at one of the three examinations. Complex tachyarrhythmias (Lown class IV) were found at least once in 48% of patients and at all three examinations in 18% but up to 38% at one of the three examinations. Only four patients demonstrated late potentials and complex tachyarrhythmias at all three examination dates. In contrast, 36% of patients showed neither late potentials nor complex tachyarrhythmias at all three examinations. When late potentials and complex arrhythmias were present simultaneously, the former were most often detected at the cut-off frequencies DC, 25 to 300 Hz (p less than 0.05). The median of the duration of late potentials was significantly longer at U1 and U2 when complex arrhythmias were also present. There was a significant relation between late potentials and complex arrhythmias at U1 and U2 (p less than 0.01 and p less than 0.025) and between the latter and disorders of regional wall motion at all examination dates (p less than 0.05).(ABSTRACT TRUNCATED AT 250 WORDS)
D000328:Adult; D000368:Aged; D001145:Arrhythmias, Cardiac / Q000175:diagnosis; D004562:Electrocardiography; D005260:Female; D005500:Follow-Up Studies; D006801:Humans; D008297:Male; D008875:Middle Aged; D009200:Myocardial Contraction; D009203:Myocardial Infarction / Q000150:complications* / Q000175:diagnosis; D013610:Tachycardia / Q000175:diagnosis*
Verlaufsbeobachtungen von Spätpotentialen und komplexen tachykarden Rhythmusstörungen nach Myokardinfarkt über zwei Jahre.