title: Beta-adrenergic receptor gene polymorphisms and hemodynamic response to dobutamine during dobutamine stress echocardiography.
abstract: Our objective was to determine if beta(1)-adrenergic receptor (beta(1)-AR) and beta(2)-AR gene polymorphisms influence heart rate (HR), systolic blood pressure (SBP) and diastolic blood pressure (DBP) response to dobutamine during dobutamine stress echocardiography (DSE). Patients (n=163) undergoing clinically indicated DSE were enrolled. Dobutamine doses were titrated from 5 to 40 microg kg(-1) min(-1) at 3 min intervals and HR, SBP and DBP were measured. Genotypes were determined for beta(1)-AR Ser49Gly, beta(1)-AR Arg389Gly, beta(2)-AR Arg16Gly and beta(2)-AR Gln27Glu polymorphisms by polymerase chain reaction-restriction fragment length polymorphism analysis, pyrosequencing and single primer extension methods. beta(2)-AR Glu27 homozygotes had a greater HR response at the highest dobutamine dose than Gln27 carriers (P=0.002). Beta(2)-AR Gly16 homozygotes had a lower HR response during 5-30 microg kg(-1) min(-1) of the dobutamine infusion protocol compared to Arg16 carriers (P=0.03). Differences in SBP by beta(2)-AR codon 16 genotype and DBP by beta(1)-AR codon 389 genotype were found at baseline and were maintained throughout DSE (P=0.06 and 0.02, respectively). However, the magnitude of SBP and DBP response to dobutamine did not differ significantly by beta(2)-AR codon 16 or beta(1)-AR codon 389 genotypes, respectively. These data suggest that the four selected beta(1)- and beta(2)-AR polymorphisms do not substantially influence the magnitude of hemodynamic response to dobutamine during DSE.
authors.affiliation: Department of Pharmacy Practice, University of Florida College of Pharmacy, Gainesville, FL 32610, USA.
authors.forename: C L
authors.initials: CL
authors.lastname: Aquilante
authors.forename: H N
authors.initials: HN
authors.lastname: Yarandi
authors.forename: L H
authors.initials: LH
authors.lastname: Cavallari
authors.forename: T E
authors.initials: TE
authors.lastname: Andrisin
authors.forename: S G
authors.initials: SG
authors.lastname: Terra
authors.forename: J F
authors.initials: JF
authors.lastname: Lewis
authors.forename: K K
authors.initials: KK
authors.lastname: Hamilton
authors.forename: J A
authors.initials: JA
authors.lastname: Johnson
mesh_terms: D000368:Aged; D001794:Blood Pressure / Q000187:drug effects*; D015331:Cohort Studies; D004280:Dobutamine / Q000008:administration & dosage* / Q000494:pharmacology; D004452:Echocardiography / Q000379:methods*; D005260:Female; D005838:Genotype; D006339:Heart Rate / Q000187:drug effects*; D006801:Humans; D008297:Male; D008875:Middle Aged; D011110:Polymorphism, Genetic; D011943:Receptors, Adrenergic, beta / Q000235:genetics*
chemical_list: D011943:Receptors, Adrenergic, beta; D004280:Dobutamine