Long-term clinical impact of functional mitral regurgitation after aortic valve replacement. Ann Thorac Surg. 2011;92:1339 45. 8. Ruel M, Kapila V, Price J, et al. Natural history and predictors of outcome in patients with concomitant functional mitral regurgitation at the time of aortic valve replacement. Circulation. 2006;114:I541 6. 9. Barbanti M, Webb JG, Hahn RT, et al. Impact of preoperative moder- ate/severe mitral regurgitation on 2-year outcome after transcath- eter and surgical aortic valve replacement: insight from the Placement of Aortic Transcatheter Valve (PARTNER) Trial Cohort A. Circulation. 2013;128:2776 84. 10. Abdelghani M, Abdel-Wahab M, Hemetsberger R, et al. Fate and long- term prognostic implications of mitral regurgitation in patients undergo- ing transcatheter aortic valve replacement. Int J Cardiol. 2019;288:39 43. 10.2.4. Intervention for Mixed MS and AR 1. Gash AK, Carabello BA, Kent RL, et al. Left ventricular performance in patients with coexistent mitral stenosis and aortic insufficiency. J Am Coll Cardiol. 1984;3:703 11. 2. Unger P, Pibarot P, Tribouilloy C, et al. Multiple and mixed valvular heart diseases. Circ Cardiovasc Imaging. 2018;11:e007862. 3. Gillinov AM, Blackstone EH, Cosgrove DM 3rd, et al. Mitral valve repair with aortic valve replacement is superior to double valve replacement. J Thorac Cardiovasc Surg. 2003;125:1372 87. 11. PROSTHETIC VALVES 11.1. Evaluation and Selection of Prosthetic Valves 11.1.1. Diagnosis and Follow-Up of Prosthetic Valves 1. Burstow DJ, Nishimura RA, Bailey KR, et al. Continuous wave Doppler echocardiographic measurement of prosthetic valve gradients. A simulta- neous Doppler-catheter correlative study. Circulation. 1989;80:504 14. 2. Baumgartner H, Khan S, DeRobertis M, et al. Effect of prosthetic aortic valve design on the Doppler-catheter gradient correlation: an in vitro study of normal St. Jude, Medtronic-Hall, Starr-Edwards and Hancock valves. J Am Coll Cardiol. 1992;19:324 32. 3. Vandervoort PM, Greenberg NL, Powell KA, et al. 