Association Between ACE Gene Polymorphism and QT Dispersion in Patients with Acute Myocardial Infarction.

Area of Science:

• Cardiology
• Genetics
• Molecular Biology

Background:

• Angiotensin converting enzyme (ACE) gene polymorphism is linked to the renin-angiotensin system, myocardial fibrosis, and ventricular repolarization abnormalities.
• Previous research suggests a connection between ACE gene variations and cardiovascular conditions.

Purpose of the Study:

• To investigate the association between the ACE gene insertion/deletion (I/D) polymorphism and QT dispersion in patients following acute myocardial infarction (MI).

Main Methods:

• The study involved 108 acute MI patients.
• Genomic DNA was analyzed for ACE gene I/D polymorphism.
• Electrocardiograms (ECGs) were recorded at baseline and 6-month follow-up to calculate QT dispersion.

Main Results:

• Patients with the DD genotype showed longer baseline QT dispersion compared to II or DI genotypes.
• At 6-month follow-up, DI genotype patients exhibited longer QT dispersion than DD or II genotypes.
• Carriers of the ACE D allele demonstrated a higher magnitude of QT dispersion prolongation at both baseline and 6-month follow-up.

Conclusions:

• The D allele of the ACE gene I/D polymorphism may be associated with QT dispersion prolongation in MI patients.
• This interaction could potentially elevate serum type I-C terminal pro-collagen, leading to myocardial fibrosis and increased action potential duration.