Patients with SIHD who have survived sudden car- diac death or potentially life-threatening ventricular arrhythmia should undergo coronary angiography to assess cardiac risk.349 351 (Level of Evidence: B) 2. Patients with SIHD who develop symptoms and signs of heart failure should be evaluated to determine whether coronary angiography should be performed for risk assessment.352 355 (Level of Evidence: B) 3.3.2. Coronary Angiography to Assess Risk After Initial Workup With Noninvasive Testing: Recommendations Class I 1. Coronary arteriography is recommended for pa- tients with SIHD whose clinical characteristics and results of noninvasive testing indicate a high likeli- hood of severe IHD and when the benefits are deemed to exceed risk.59,126,260,310,356 362 (Level of Evidence: C) Class IIa 1. Coronary angiography is reasonable to further as- sess risk in patients with SIHD who have depressed LV function (EF <50%) and moderate risk criteria on noninvasive testing with demonstrable ische- mia.363 365 (Level of Evidence: C) 2. Coronary angiography is reasonable to further as- sess risk in patients with SIHD and inconclusive prognostic information after noninvasive testing or in patients for whom noninvasive testing is contra- indicated or inadequate. (Level of Evidence: C) 3. Coronary angiography for risk assessment is reason- able for patients with SIHD who have unsatisfactory quality of life due to angina, have preserved LV function (EF >50%), and have intermediate risk criteria on noninvasive testing.306,366 (Level of Evidence: C) Class III: No Benefit 1. Coronary angiography for risk assessment is not recommended in patients with SIHD who elect not to undergo revascularization or who are not candidates for revascularization because of comorbidities or individual preferences.306,366 (Level of Evidence: B) 2. 