Loss of opposite left ventricular basal and apical rotation predicts acute response to cardiac resynchronization therapy and is associated with long-term reversed remodeling.
BACKGROUND
Normal left ventricular (LV) torsion is caused by opposite basal and apical rotation. Opposite rotation can be lost in heart failure, but might be restored by pacing; therefore, the predictive value of the loss of opposite base-apex rotation in heart failure patients for the response to cardiac resynchronization therapy (CRT) was studied.


RESULTS
In 34 CRT candidates and 12 controls, basal and apical LV rotations were calculated using magnetic resonance image tagging. Loss of opposite rotation was quantified by the correlation between both rotation curves: a negative correlation indicates normal, opposite rotation and a positive correlation indicates that base and apex rotate in the same direction. In patients, LV pressure was measured invasively during biventricular stimulation. Acute response to CRT was defined by >10% increase in dP/dt(max) relative to baseline. LV volume was determined at baseline and 8 months follow-up using echocardiography. The base-apex rotation correlation (BARC) was significantly higher in acute responders (n=22) than in nonresponders (n=12) and controls (0.64+/-0.51, -0.23+/-0.67, and -0.68+/-0.22, respectively; P=.001). The sensitivity and specificity for prediction of acute response were 82% and 83%, respectively, at a cutoff value of 0.5. At follow-up, volumes could be analyzed in 18 patients. In the group with BARC >0.5, end-diastolic volume decreased by 7% (NS), end-systolic volume by 16%, and ejection fraction increased by 28% (both P=.02), whereas in the group with BARC <0.5, no significant changes were observed.


CONCLUSIONS
The loss of opposite base-apex rotation in patients eligible for CRT is an excellent predictor of acute response and is associated with LV reverse remodeling.
Department of Physics and Medical Technology, VU University Medical Center, Amsterdam, the Netherlands. i.russel@vumc.nl
Iris K
IK
Rüssel
Marco J W
MJ
Götte
Gerben J
GJ
de Roest
J Tim
JT
Marcus
Sandra R
SR
Tecelão
Cornelis P
CP
Allaart
Carel C
CC
de Cock
Robert M
RM
Heethaar
Albert C
AC
van Rossum
D000328:Adult; D000368:Aged; D002304:Cardiac Pacing, Artificial / Q000379:methods; D005260:Female; D006329:Heart Conduction System / Q000502:physiology*; D006333:Heart Failure / Q000503:physiopathology / Q000628:therapy; D006801:Humans; D008297:Male; D008875:Middle Aged; D011237:Predictive Value of Tests; D013997:Time Factors; D018487:Ventricular Dysfunction, Left / Q000175:diagnosis / Q000503:physiopathology*; D020257:Ventricular Remodeling / Q000502:physiology*