All authors have no conflicts of interest.
High-Resolution Optical Mapping of Ventricular Tachycardia in Rats with Chronic Myocardial Infarction
Article first published online: 18 FEB 2010
©2010, The Authors. Journal compilation ©2010 Wiley Periodicals, Inc.
Pacing and Clinical Electrophysiology
Volume 33, Issue 6, pages 687–695, June 2010
How to Cite
DING, C., GEPSTEIN, L., NGUYEN, D. T., WILSON, E., HULLEY, G., BEASER, A., LEE, R. J. and OLGIN, J. (2010), High-Resolution Optical Mapping of Ventricular Tachycardia in Rats with Chronic Myocardial Infarction. Pacing and Clinical Electrophysiology, 33: 687–695. doi: 10.1111/j.1540-8159.2010.02704.x
C. Ding and L. Gepstein contributed equally as first authors.
- Issue published online: 2 JUN 2010
- Article first published online: 18 FEB 2010
- Received April 29, 2009; revised October 7, 2009; accepted December 20, 2009.
- optical mapping;
- ventricular tachycardia;
- myocardial infarction;
- action potential;
- infarct border zone
Background: Ventricular tachycardia (VT) is a common cause of mortality in post-myocardial infarction (MI) patients, even in the current era of coronary revascularization treatment. We report a reproducible VT model in rats with chronic MI induced by ischemia-reperfusion and describe its electrophysiological characteristics using high-resolution optical mapping.
Methods: An MI was generated by left anterior descending coronary ligation (25 minutes) followed by reperfusion in 20 rats. Electrophysiology study and optical mapping were performed 5 weeks later using a Langendorff-perfused preparation and compared to normal rats.
Results: The conduction velocity of the MI border zone was decreased to 53% of the normal areas remote from the infarct (0.37 ± 0.16 m/sec vs 0.70 ± 0.09 m/sec, P < 0.0001). The rate of VT inducibility in MI rats was significantly greater than in normal control rats (70% vs 0%, P = 0.00002). VT circuits involving the infarct area were identified with optical mapping in 83% MI rats. In addition, fixed and functional conduction block were observed in the infarct border zone.
Conclusion: This ischemia-reperfusion MI rat model is a reliable VT model, which simulates clinical revascularization treatment. High-resolution optical mapping in this model is useful to study the mechanism of VT and evaluate the effects of therapies. (PACE 2010; 33:687–695)