Serial changes in the high-frequency ECG during the first year following acute myocardial infarction.
BACKGROUND
Previous studies have shown reduced high-frequency QRS components (HF-QRS) after acute myocardial infarction (MI). The purpose of this study was to investigate serial changes in HF-QRS during the first year following acute MI.


METHODS
A total of 75 patients were included. Standard- and high-frequency ECGs were recorded on five occasions during the year following the MI (a few days after the MI, after 6 weeks, and after 3, 6 and 12 months).


RESULTS
There was a statistically significant increase in HF-QRS during the follow-up year (P = 0.002). There were no significant differences in HF-QRS when comparing either the infarct location or the presence or absence of reperfusive therapy. Large differences in HF-QRS were observed, both intra-individually and inter-individually, during the year.


CONCLUSIONS
There was a statistically significant increase in HF-QRS during the year following acute MI.
Trägårdh
Elin
E
Department of Clinical Physiology, Lund University, Lund, Sweden. elin.tragardh@med.lu.se
Pahlm
Olle
O
Hedén
Bo
B
Sörnmo
Leif
L
Tägil
Kristina
K
Wagner
Galen S
GS
Pettersson
Jonas
J
D000368:Aged; D004562:Electrocardiography / Q000379:methods*; D005260:Female; D006801:Humans; D008297:Male; D008875:Middle Aged; D015233:Models, Statistical; D009203:Myocardial Infarction / Q000175:diagnosis* / Q000628:therapy*; D015425:Myocardial Reperfusion; D012815:Signal Processing, Computer-Assisted; D013997:Time Factors