 After 25 minutes of cooling, the aorta was cross-clamped and the heart arrested by administration of 30 cubic centimeter/kilogram of cold-blood cardioplegia delivered directly within the aortic root following the aorta cross-clamping. 
After 25 minutes of cooling , the aorta was cross - clamped and the heart arrested by administration of 30 cubic centimeter / kilogram of cold - blood cardioplegia delivered directly within the aortic root following the aorta cross - clamping .