Tricuspid Regurgitation Improvement Following Mitral Valve Repair

Mechanisms of TR Improvement

• The American Heart Association suggests that when TR coexists with mitral stenosis or regurgitation, pulmonary hypertension is often present, which contributes to the TR development 1, 2
• The American College of Cardiology recommends that after successful mitral valve repair or valvotomy, pulmonary hypertension and TR almost always diminish if the tricuspid valve anatomy is not grossly distorted 3, 4
• The reduction in left atrial pressure following mitral valve repair leads to decreased pulmonary artery pressure, which reduces right ventricular afterload and improves tricuspid valve function, as stated by the European Society of Cardiology 1, 2

Predictors of TR Improvement

• TR is more likely to improve when pulmonary hypertension is severe and the tricuspid valve anatomy is not grossly distorted, according to the American Heart Association 1, 5
• The European Society of Cardiology states that TR is more likely to improve when the tricuspid annulus is not significantly dilated (diameter <35 mm or <21 mm/m²) 6, 7
• The American College of Cardiology recommends that TR is more likely to improve when there is no severe tethering of the tricuspid valve leaflets (tenting area <1 cm²) 6, 7
• Functional TR rather than organic tricuspid valve disease is a predictor of TR improvement, as suggested by the American Heart Association 3, 4

Evidence on TR Improvement

• Despite some studies being ignored, the European Heart Journal suggests that concomitant tricuspid annuloplasty should be considered during mitral valve surgery when severe TR is present 8
• The American College of Cardiology states that concomitant tricuspid valve repair provides more durable results than mitral valve repair alone in patients with significant TR, and improves functional status independent of the degree of TR when based on tricuspid dilatation 9

Clinical Implications and Monitoring

• The European Society of Cardiology recommends regular echocardiographic follow-up to monitor TR progression and right ventricular function after mitral valve repair, as up to 20-50% of patients may develop recurrent TR if no concomitant tricuspid intervention was performed 6

Common Pitfalls to Avoid

• The European Heart Journal suggests that failing to assess the severity of TR and tricuspid annular dimensions before mitral valve surgery is a common pitfall to avoid 8
• The American College of Cardiology states that underestimating the importance of tricuspid valve tethering as a predictor of residual TR after surgery is a common pitfall to avoid 6, 7