In this paper the duties of an anesthesiologist and his right of i=;electing patient is discussed. La,ter, we di:=:cuss the <::mergencies cf heart surgery, pre up visit and alsc few dcails of pre up medication cf thei,e pati<mts. We also touch on the stages of anesthPsia and point to our preference for the use cf artery and vein for arterial and venous cannulation. In this paper we discuss in brief pro and con of normoventilation, PH, Po:! , PCo2, and BE. At the end scme of the dangers and comr,lications that enc> may face during the heart surgery and methcds of prevention have been discussed.