Atrial electrical, contractile and structural remodeling induced by short-term atrial tachycardia in a canine model.
- Author:
Lei ZHANG
1
;
Xiao-ping JI
;
Wei ZHANG
;
Rong WANG
;
Shi-liang JIANG
;
Wen-qiang CHEN
;
Xue-dong SANG
;
Yun ZHANG
Author Information
- Publication Type:Journal Article
- MeSH: Animals; Atrial Fibrillation; physiopathology; therapy; Atrial Function, Right; Cardiac Pacing, Artificial; methods; Disease Models, Animal; Dogs; Female; Male; Myocardial Contraction
- From: Chinese Journal of Cardiology 2007;35(2):137-140
- CountryChina
- Language:Chinese
-
Abstract:
OBJECTIVETo evaluate atrial remodeling induced by short term pacing in a canine model.
METHODSTransvenous lead was inserted into the right atrial appendage of anesthetized mongrel dogs and paced for 5 hours at 450 bpm (n=12). Effective refractory period (ERP) and P-wave duration were measured before and post pacing and left ventricular pressure was monitored during the procedure. Echocardiography was performed to observe the presence or absence of spontaneous echo contrast and to assess the effect of rapid atrial pacing on atrial function. All measurements were obtained in sinus rhythm. Histology of the myocardium in left atrial trabeculae and appendages was examined by electron microscopy.
RESULTSCompared to pre-pacing status, ERP was significantly reduced [(87.27 +/- 16.35) ms vs. (113.27 +/- 11.99) ms, P<0.01] at a cycle length of 300 ms, P-wave duration significantly increased [(56.09 +/- 8.62) ms vs. (52.09 +/- 7.63) ms, P<0.01], the peak velocity of atrial contraction significantly decreased [(48.92 +/- 10.80) cm/s vs. (59.25 +/- 9.37) cm/s, P<0.05] while heart rates and left ventricular pressure were not affected post five hours rapid atrial pacing. Pacing also induced significantly cellular ultrastructures changes including myofibrils loss, glycogen accumulation, mitochondria loss and swelling.
CONCLUSIONShort term pacing resulted in atrial electrical, contractile and structural remodeling.