Ile164 variant of beta 2-adrenoceptor does not influence outcome in heart failure but may interact with beta blocker treatment

Background: The Ile164 variant of the beta 2-adrenoceptor has been shown to alter cardiovascular phenotypes and adversely affect survival in heart failure patients. Aims: We aimed to replicate this observation by genotyping a cohort of 451 heart failure patients for the Ile164 polymorphism. Methods: Patient outcome was recorded over a median follow-up period of 3.09 years, and genotypes were derived by multiplex amplification refractory mutation system PCR. Results: Genotypes were obtained for 443 patients, and 3.2% of these (14 patients) were heterozygous for the Ile164 SNP. Demographic data, cardiac function and neurohormonal profiles did not differ between genotype groups. Ile164 genotype did not significantly affect survival in this cohort (Thr164 homozygotes 48.9%, Ile164 heterozygous 42.9%, p=0.66), although multivariate analysis suggested that beta-blocker treatment may negatively impact survival in the heterozygote group. Conclusion: This study suggests that the Ile164 polymorphism of the beta 2-adrenoceptor does not have a major impact on outcome in individuals with heart failure, although it's potential interaction with beta-blockers requires further examination. (c) 2007 European Society of Cardiology. Published by Elsevier B.V. All rights reserved.