Impact of transcatheter aortic valve implantation or surgical aortic valve replacement on right ventricular function.

Objective: Transcatheter aortic valve implantation (TAVI) has become an alternative to surgical aortic valve replacement (sAVR) in selected high risk patients. While improvement in left ventricular function after TAVI has been demonstrated, little is known about the impact on right ventricular (RV) function. Since postoperative RV dysfunction is linked to adverse outcomes, the authors sought to investigate the effect of TAVI and aortic valve replacement (AVR) on RV function using speckle tracking echocardiography.
Design: Cross-sectional study in tertiary healthcare setting.
Setting: 101 patients with severe symptomatic aortic stenosis (age 81 ± 11 yrs) who underwent TAVI and 22 patients who underwent sAVR were included. RV function was assessed using 2D longitudinal strain (RV-LS), fractional area change and tricuspid annular plain systolic excursion before and after sAVR and TAVI (median 89 days).
Results: Although the TAVI group had worse baseline characteristics, RV function remained unchanged in this group whereas significant deterioration of RV function was observed in patients undergoing conventional AVR: RV-LS (-25.2 ± 6.1 vs -20.0 ± 7.0%; p=0.009), RV-fractional area change (47.0 ± 7.0 vs 39.8 ± 10.7%, p=0.019) and tricuspid annular plain systolic excursion (24 ± 5 vs 16 ± 4 mm, p=0.0001).
Conclusion: While TAVI did not affect RV function it deteriorated significantly in patients undergoing sAVR. The authors speculate that this may be related to the detrimental effects of pericardiotomy and, to a lesser degree, cardiopulmonary bypass. While further studies are required to assess the clinical significance of this finding, these data suggest that patients with pre-existing RV dysfunction may benefit from TAVI and that RV function should be incorporated into future risk scores.