Long-term cardiac memory in canine heart is associated with the evolution of a transmural repolarization gradient.
OBJECTIVE
The contribution of regional electrophysiologic heterogeneity to the T-wave changes of long-term cardiac memory (CM) is not known. We mapped activation and repolarization in dogs after induction of CM and in sham animals.


RESULTS
CM was induced by three weeks of AV-sequential pacing at the anterior free wall of the left ventricle (LV), midway between apex and base in 5 dogs. In 4 sham controls a pacemaker was implanted but ventricular pacing was not performed. At 3 weeks, unipolar electrograms were recorded (98 epicardial, 120 intramural and endocardial electrodes) during atrial stimulation (cycle length 450 ms). Activation times (AT) and repolarization times (RT) were measured and activation recovery intervals (ARIs) calculated. CM was associated with 1) deeper T waves on ECG, with no change in QT interval; 2) longer activation time at the site of stimulation in CM (29.7+/-1.0, X+/-SEM) than sham (23.9+/-1.3 ms p<0.01); 3) an LV transmural gradient in repolarization time such that repolarization at the epicardium terminated 12.4+/-2.4 ms later than at the endocardium p<0.01), in contrast to no gradient in shams (2.7+/-4.2 ms); in memory dogs, the repolarization time gradient was greatest at sites around the pacing electrode varying from 13.1+/-2.3 ms to 25.5+/-3.8 ms; 4) more negative left ventricular potentials at the peak of the body surface T wave (-4.9+/-0.8 vs -2.2+/-0.4 mV; p<0.05) but no altered right ventricular epicardial T-wave potentials. ARIs did not differ between groups. Right ventricular activation was delayed but was not associated with altered repolarization because of compensatory shortening of the right ventricular ARIs.


CONCLUSIONS
CM-induced T-wave changes are caused by evolution of transmural repolarization gradients manifested during atrial stimulation that are maximal near the site of ventricular pacing.
Coronel
Ruben
R
Experimental Cardiology Group, Academic Medical Center, University of Amsterdam, The Netherlands. r.coronel@amc.uva.nl
Opthof
Tobias
T
Plotnikov
Alexei N
AN
Wilms-Schopman
Francien J G
FJ
Shlapakova
Iryna N
IN
Danilo
Peter
P
Sosunov
Eugene A
EA
Anyukhovsky
Evgeny P
EP
Janse
Michiel J
MJ
Rosen
Michael R
MR
D000200:Action Potentials; D000818:Animals; D002304:Cardiac Pacing, Artificial; D004285:Dogs; D004562:Electrocardiography; D004699:Endocardium / Q000502:physiology; D006329:Heart Conduction System / Q000502:physiology*; D008297:Male; D010496:Pericardium / Q000502:physiology; D013997:Time Factors; D016276:Ventricular Function