<prompt> In stable anginaCK- MB is elevatedTroponin 1 is elevatedMyoglobin is elevatedThe level of cardiac markers remain un changed  <response>: Ref Harrison 19 th ed pg 1593 Necrotic myocardial fibres release a variety of enzymes into blood stream. In stable angina necrosis of the cell does not occur so there is no elevation of serum enzymes. 