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Effects of Early Losartan Therapy on Ventricular Late Potentials in Acute Myocardial Infarction

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Background: Ventricular late potentials (LPs) obtained by the signal-averaged electrocardiogram (SAECG) have prognostic significance as independent predictors of arrhythmic events after an acute myocardial infarction (AMI). Angiotensin receptor blockers reduce the overall mortality and risk of sudden cardiac death in postinfarction patients. The aim of this study was to investigate the effect of early losartan therapy on ventricular LPs, a noninvasive method for the evaluation of arrhythmogenic substrates in AMI patients.

Methods: The study included 97 patients with their first AMI. Forty-eight patients (39 men and 9 women, aged 58.8 ± 13.19 years), received early losartan therapy. The control group consisted of 49 patients (38 men and 11 women, aged 59.55 ± 11.0 years), did not received early losartan therapy. The SAECG was performed at admission and day 14.

Results: The baseline clinical, angiographic characteristics, and reperfusion methods were similar in both groups. The baseline SAECG findings were also similar in the two groups. There was a significant decrease in the rate of LP, between the first and last SAECG recordings, after reperfusion therapy in the losartan group. All of the parameters of LPs were significantly improved in the losartan group on the last SAECG recordings.

Conclusion: The results of this study showed that losartan treatment, early after an AMI, reduced the incidence of LP and may thus favorably affect arrhythmia substrates.

Ann Noninvasive Electrocardiol 2008;13(4):371–377
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Keywords: late potentials; myocardial infarction; signal-averaged ECG

Document Type: Research Article

Affiliations: Department of Cardiology, Inha University College of Medicine, Incheon, Korea

Publication date: October 1, 2008

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