14. Topilsky Y, Khanna A, Le Tourneau T, et al. Clinical context and mechanism of functional tricuspid regurgitation in patients with and without pulmo- nary hypertension. Circ Cardiovasc Imaging. 2012;5:314 23. 15. Mutlak D, Lessick J, Reisner SA, et al. Echocardiography-based spectrum of severe tricuspid regurgitation: the frequency of apparently idiopathic tricuspid regurgitation. J Am Soc Echocardiogr. 2007;20:405 8. 16. Zhao SX, Soltanzad N, Swaminathan A, et al. Frequency and associat- ed clinical features of functional tricuspid regurgitation in patients with chronic atrial fibrillation. Am J Cardiol. 2017;119:1371 7. 17. Utsunomiya H, Itabashi Y, Mihara H, et al. Functional tricuspid regur- gitation caused by chronic atrial fibrillation: a real-time 3-dimensional transesophageal echocardiography study. Circ Cardiovasc Imaging. 2017;10:e004897. 18. Yamasaki N, Kondo F, Kubo T, et al. Severe tricuspid regurgitation in the aged: atrial remodeling associated with long-standing atrial fibrillation. J Cardiol. 2006;48:315 23. 19. Maeder MT, Holst DP, Kaye DM. Tricuspid regurgitation contributes to re- nal dysfunction in patients with heart failure. J Card Fail. 2008;14:824 30. 20. Lau GT, Tan HC, Kritharides L. Type of liver dysfunction in heart failure and its relation to the severity of tricuspid regurgitation. Am J Cardiol. 2002;90:1405 9. 21. Mangoni AA, DiSalvo TG, Vlahakes GJ, et al. Outcome following isolated tricuspid valve replacement. Eur J Cardiothorac Surg. 2001;19:68 73. 22. Kim JB, Jung S-H, Choo SJ, et al. Surgical outcomes of severe tricuspid re- gurgitation: predictors of adverse clinical outcomes. Heart. 2013;99:181 7. 23. Ailawadi G, Lapar DJ, Swenson BR, et al. Model for end-stage liver dis- ease predicts mortality for tricuspid valve surgery. Ann Thorac Surg. 2009;87:1460 7. 8.2. Tricuspid Regurgitation 8.2.1. Diagnosis of TR 1. Zoghbi WA, Adams D, Bonow RO, et al. Recommendations for noninva- sive evaluation of native valvular regurgitation: a report from the Ameri- can Society of Echocardiography. 