The relationship between tricuspid regurgitation severity and right atrial mechanics: a speckle tracking...

The aim at this study was to assess the influence of the tricuspid regurgitation volume (TRvol) in right atrium (RA) reservoir phase myocardial mechanics. We included 55 heart failure (HF) patients referred for transthoracic echocardiography during a 2-month period. 18 Had HF with a reduced ejection fraction (HFREF) and 37 HF with a preserved ejection fraction (HFPEF). TR was chronic and functional. TRvol was calculated according to the PISA method. This study of RA used 2D-speckle tracking echocardiography to measure strain (rεR) and strain rate (rSR(R)). The reference frame coincided with the onset of the QRS. RA stiffness was assessed as the ratio: (rE/e')/rε(R). The median age of the sample was 78 (64-84) years, with female gender predominance (63.6%). The median value of rε(R) was 16% (range, 12.7-24.0) and of rSR(R) was 1.57 s(-1) (range, 1.09-2.05). We observed a significant negative correlation between rε(R) (r = -0.68, p < 0.01) and rSR(R) (r = -0.58, p < 0.01) and TRvol. RA mechanics decreased significantly with an increase in the TR grade. We created two multivariate linear regression models for rε(R) and rSR(R), separately for the patients with sinus rhythm or atrial fibrillation. The TRvol was independently associated with rε(R) after adjusting to the RA area, right ventricular longitudinal systolic function and the estimated pulmonary vascular resistance. We demonstrated an increase in RA stiffness with an increase in TR severity, and an association for functional status (NYHA class) and RA compliance. The HFREF group had a significantly lower rε(R) and rSR(R) that the HFPEF patients. According to our study, in HF patients, a chronic volume overload state significantly reduced the RA reservoir phase mechanics.