[Analysis of electrocardiographic recordings associated with acute myocardial infarction].
OBJECTIVE
Evaluate correlations between variations in eletrocardiogram (ECG) recordings and acute myocardial infarction.


METHODS
Use of a low-cost software to digitalize printed and/or ".pdf" file format ECG recordings. Calculation of ST-segment area and amplitudes of the J and Y points.


RESULTS
The amplitude of the Y point holds maximum correlation with troponin concentration. ST-segment elevation is not a good statistical indicator of myocardial infarction severity. There is a strong negative correlation between the amplitude of the J point and the amount of magnesium ions, but no statistical correlation with sodium or calcium ions. Neither method for calculating the ST-segment area (pixel counts and interpolation) indicated any significant differences in the results.


CONCLUSIONS
The software used proved to be functional and cost-effective. Y point amplitude is a sensitive marker of myocardial infarction, and is also a calculation method both simpler to use and less subject to error than the calculation of the ST-segment elevation area.
Mansur
Paulo Henrique Garcia
PH
Centro de Ensino Superior de Catalão, Catalão, GO, Brazil.
Cury
Lacordaire Kemel Pimenta
LK
Destro-Filho
João Batista
JB
Resende
Elmiro Santos
ES
Destro
José Paulo Breda
JP
de Oliveira
Luana Michelli
LM
de Moraes
Diego Carvalho Gomes
DC
de Freitas
Geraldo Rubens Ramos
GR
Rocha
Lucila Soares da Silva
LS
D000704:Analysis of Variance; D004562:Electrocardiography / Q000191:economics / Q000379:methods / Q000592:standards*; D006801:Humans; D008955:Models, Cardiovascular; D009203:Myocardial Infarction / Q000175:diagnosis* / Q000503:physiopathology / Q000517:prevention & control; D012815:Signal Processing, Computer-Assisted