The Relationship between Angiotensin-II Type 1 Receptor Gene Polymorphism and Repolarization Parameters after a First Anterior Acute Myocardial Infarction.
OBJECTIVE
Genetic influence on T-wave peak to End (Tpe) time in patients with a first anterior acute myocardial infarction (AMI) is uncertain. A polymorphism in the angiotensin-II type 1 receptor (AT1R) gene was discovered recently. The polymorphism consists of an A or C variant, given three different possible genotypes: AA, AC, CC. The purpose of this study was to determine the effects of polymorphism of the AT1R gene polymorphism on Tpe after a first anterior AMI.


METHODS
The subjects were 142 patients (110 men, 32 women, 58±13 years) with a first anterior AMI; ten patients were excluded from this study. Based on the polymorphism of the AT1R gene, they were classified into two groups: Group 1 (AA genotype) of 91 patients and group 2 (AC and CC genotype) of 41 patients. A 12-lead resting ECG was recorded at admission to the coronary care unit in patients with anterior AMI and were manually measured with a ruler. QTc, QTd, QTcd, Tpe, Tpe/QT parameters were measured.


RESULTS
There was no significant difference in the baseline characteristics of patients (p>0.05). We found significant reduction in QTc, QTd, QTcd, Tpe, Tpe/QT indices Group 1 (AA genotype) (mean 66±28 ms) than group 2 (AC and CC genotype) (mean 95±34 ms) (p<0.05).


CONCLUSIONS
In patients with a first anterior AMI, AT1R gene polymorphisms may influence on repolarization parameters. Although further studies are required.
Department of Cardiology, Diyarbakır Gazi Yasargil Education and Research Hospital, Diyarbakir, Turkey.
Onder
O
Ozturk
Department of Public Health and Neurology, Dicle University Medical Faculty, Diyarbakir, Turkey.
Unal
U
Ozturk
Department of Microbiology, Dicle University Medical Faculty, Diyarbakir, Turkey.
Sebnem
S
Nergiz
Department of Cardiology, Diyarbakır Gazi Yasargil Education and Research Hospital, Diyarbakir, Turkey.
M Zulkif
MZ
Karahan
Electrocardiography; Genetic; Myocardial infarction; Polymorphism