The purpose of this study is to determine whether polymorphisms in G protein subunits, namely Galphas and Galphaq, are associated with altered cardiac performance in heart failure patients.

G Protein pathways plays a pivotal role in mediating positive inotropy and cardiac hypertrophy by transducing signals of neurohormones in cardiomyocytes. Single nucleotide polymorphisms (SNPs) in the G protein subunits Galphas and Galphaq have been shown to result in altered protein expression. We now want to examine whether G Protein polymorphisms alter NYHA functional class, and hemodynamic variables in patients with coronary artery disease scheduled for coronary artery bypass grafting .

Inclusion Criteria:

• clinical diagnosis of coronary artery disease
• patients scheduled for coronary artery bypass grafting

Exclusion Criteria:

• emergency operation
• combined vitium

Patients with coronary artery disease scheduled for coronary artery bypass grafting in the university hospital