Impact of right ventricular contractility on left ventricular dyssynchrony in patients with chronic systolic heart failure.
BACKGROUND
Cardiac resynchronization therapy (CRT) is an important therapeutic approach for patients with symptomatic heart failure. The assessment of mechanical dyssynchrony, however, remains an issue. Little data are available regarding the influence of the right ventricle (RV) on left ventricle (LV) mechanical dyssynchrony as assessed by echocardiography.


OBJECTIVE
We sought to assess the impact of RV contractility on LV function and dyssynchrony.


METHODS
A total of 40 patients with congestive heart failure were analyzed. Twenty had RV dysfunction, as defined by a tricuspid annular systolic peak of tissue Doppler (SaRV)<11.5 cm/s, while the remaining 20 had SaRV>11.5 cm/s. All patients underwent echocardiography in order to determine RV function, LV function, and dyssynchrony.


RESULTS
The two populations were similar regarding diastolic function, atrio-ventricular conduction and interventricular dyssynchrony. Patients with RV dysfunction showed significantly more severe LV longitudinal dyssynchrony (130±103 ms vs. 62±59 ms; p=0.01). In addition, SaRV (systolic peak recorded at the tricuspid annulus) was correlated with LV longitudinal dyssynchrony (r=0.47; p=0.001). In contrast, LV radial contractility and dyssynchrony (103±110 ms vs. 100±78 ms; p=0.5) were not affected by RV function.


CONCLUSIONS
Quantitative analysis of RV function is important when assessing LV function and dyssynchrony in patients with systolic heart failure. RV function is associated with intra-LV dyssynchrony, particularly when considering longitudinal function.
Bernard
Anne
A
Service de Cardiologie, CIT-IC 804, LTSI INSERM U 642, CHU Rennes, France.
Donal
Erwan
E
Leclercq
Christophe
C
Ollivier
Romain
R
Schnell
Frédéric
F
de Place
Christian
C
Daubert
Jean-Claude
JC
Mabo
Philippe
P
D000368:Aged; D016022:Case-Control Studies; D002908:Chronic Disease; D005260:Female; D054143:Heart Failure, Systolic / Q000150:complications / Q000503:physiopathology*; D006801:Humans; D008297:Male; D008875:Middle Aged; D018487:Ventricular Dysfunction, Left / Q000150:complications / Q000503:physiopathology*; D018497:Ventricular Dysfunction, Right / Q000150:complications / Q000503:physiopathology*; D016278:Ventricular Function, Right / Q000502:physiology*