(Level of Evidence: C) 6.3.1.3. Irrespective of Ability to Exercise Class IIb 1. CCTA for assessment of patency of CABG or of coronary stents 3 mm or larger in diameter might be reasonable in patients with known SIHD who have new or worsening symptoms not consistent with UA, irrespective of ability to exercise.1244 1248 (Level of Evidence: B) 2. CCTA might be reasonable in patients with known SIHD who have new or worsening symptoms not consistent with UA, irrespective of ability to exercise, in the absence of known moderate or severe calcifi- Table 20. 