IRCT20120215009014N223 IRCT 2018-06-14 Hamedan University of Medical Sciences Effect of selenium versus placebo on clinical symptoms after coronary artery bypass graft in patients with coronary artery stenosis Effect of selenium versus placebo on clinical symptoms after coronary artery bypass graft in patients with coronary artery stenosis: a double-blind randomized clinical trial 2018-05-22 anticipated 60 Complete https://irct.ir/trial/31171 interventional Randomization: Randomized, Blinding: Double blinded, Placebo: Used, Assignment: Parallel, Purpose: Treatment, Randomization description: Random assignment of the patients to the intervention and control groups through the drawing of lots, Blinding description: Patients will be unaware of the type of intervention. The physician who will examine the patients will not be aware of the intervention. Therefore, the trial will be run as double blind. 2 Coronary artery stenosis. Intervention 1: Intervention group: Intravenous injection of selenium 100 mic gr single dose 10 min before detaching the pump. Intervention 2: Control group: Intravenous injection of distilled water 2 ml single dose 10 min before detaching the pump us. Undecided - It is not yet known if there will be a plan to make this available Justification or reason for indecision in sharing IPD is It depends on the situations and the results of the study as well as approval of the financial supporting organization.