Improved right ventricular function following transapical transcatheter mitral valve implantation for severe mitral regurgitation

Hungerford, Sara and Bart, Nicole and Jansz, Paul and Kay, Sharon and Emmanuel, Sam and Namasivayam, Mayooran and Dahle, Gry and Duncan, Alison and Hayward, Christopher and Muller, David W.M. (2021) Improved right ventricular function following transapical transcatheter mitral valve implantation for severe mitral regurgitation. IJC Heart & Vasculature, 32. p. 100687. ISSN 23529067

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Background: Transapical transcatheter mitral valve implantation (TMVI) may be a therapeutic option for patients with severe mitral regurgitation (MR) excluded from cardiac surgery due to excessive risk. Exclusion criteria frequently include pulmonary hypertension and right ventricular (RV) dysfunction. The effect of TMVI on RV function has not previously been well-characterized. The aim of this study was to examine the procedural and 3-month impact of TMVI on RV hemodynamics and function. Methods: This was a multi-center, retrospective, observational cohort study of patients with >3+MR undergoing TMVI. Pre- and post-TMVI hemodynamics were assessed with right heart catheterization. RV function was assessed at baseline, pre-discharge and at 3-months by echocardiography. Results: Forty-six patients (age 72+/-9 years; 34 men) with >/=3+MR underwent TMVI over a 5-year period. Successful device implantation was achieved in all patients with abolition of MR (p < 0.001) and reduction in left-ventricular end-diastolic volume (p = 0.001). RV stroke work index (RVSWI) increased intra-operatively (7 +/- 4 g/m/beat/m(2) vs 11 +/- 5 g/m/beat/m(2); p < 0.001). At 3-months there were reductions in severity of tricuspid regurgitation (TR) (p < 0.001) and pulmonary artery systolic pressure (PASP) (49 +/- 16 mmHg vs 36 +/- 12 mmHg; p < 0.001), and improvements in RV fractional area change (28 +/- 7% vs 34 +/- 9%, p<0.001), tricuspid annular plane systolic excursion (TAPSE) (1.0 +/- 0.3 vs 1.5 +/- 0.5cm, p = 0.03), and RV free wall longitudinal strain (-14.2+/-5.0 vs -17.6+/-7.3, p = 0.05). Conclusions: Transapical TMVI results in significant improvement of RV function that is sustained to 3-months as evidenced by improvements in RVSWI and RV fractional area change, as well as reductions in PASP and TR severity.

Item Type: Article
Subjects: R Medicine > R Medicine (General)
Depositing User: Repository Administrator
Date Deposited: 25 Feb 2021 08:41
Last Modified: 14 Oct 2021 07:52

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