Value of exercise echocardiography for predicting mortality in elderly patients. Eur J Clin Invest. 2010;40:1122 30. 1155. Bernheim AM, Kittipovanonth M, Takahashi PY, et al. Does the prognostic value of dobutamine stress echocardiography differ among different age groups? Am Heart J. 2011;161:740 5. 1156. Bhatt DL, Roe MT, Peterson ED, et al. Utilization of early invasive management strategies for high-risk patients with non-ST-segment elevation acute coronary syndromes: results from the CRUSADE Quality Improvement Initiative. JAMA. 2004;292:2096 104. 1157. Karlson BW, Herlitz J, Pettersson P, et al. One-year prognosis in patients hospitalized with a history of unstable angina pectoris. Clin Cardiol. 1993;16:397 402. 1158. Kwok JM, Miller TD, Hodge DO, et al. Prognostic value of the Duke treadmill score in the elderly. J Am Coll Cardiol. 2002;39:1475 81. 1159. Avezum A, Makdisse M, Spencer F, et al. Impact of age on man- agement and outcome of acute coronary syndrome: observations from the Global Registry of Acute Coronary Events (GRACE). Am Heart J. 2005;149:67 73. 1160. Cannon CP, Weintraub WS, Demopoulos LA, et al. Comparison of early invasive and conservative strategies in patients with unstable coronary syndromes treated with the glycoprotein IIb/IIIa inhibitor tirofiban. N Engl J Med. 2001;344:1879 87. 1161. Mehran R, Aymong ED, Nikolsky E, et al. A simple risk score for prediction of contrast-induced nephropathy after percutaneous coronary intervention: development and initial validation. J Am Coll Cardiol. 2004;44:1393 9. 1162. Maron DJ, Spertus JA, Mancini GB, et al. Impact of an initial strategy of medical therapy without percutaneous coronary intervention in high-risk patients from the Clinical Outcomes Utilizing Revasculariza- tion and Aggressive DruG Evaluation (COURAGE) trial. Am J Cardiol. 2009;104:1055 62. 1163. Pfisterer M, Buser P, Osswald S, et al. 