Korean Circulation Journal

The Korean Society of Cardiology (대한심장학회)
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Survival, Exercise Capacity, and Left Ventricular Remodeling in a Rat Model of Chronic Mitral Regurgitation: Serial Echocardiography and Pressure-Volume Analysis

  • Kim, Kyung-Hee (Department of Internal Medicine, Cardiovascular Center, Seoul National University College of Medicine) ;
  • Kim, Yong-Jin (Department of Internal Medicine, Cardiovascular Center, Seoul National University College of Medicine) ;
  • Lee, Seung-Pyo (Department of Internal Medicine, Cardiovascular Center, Seoul National University College of Medicine) ;
  • Kim, Hyung-Kwan (Department of Internal Medicine, Cardiovascular Center, Seoul National University College of Medicine) ;
  • Seo, Jeong-Wook (Department of Internal Medicine, Cardiovascular Center, Seoul National University College of Medicine) ;
  • Sohn, Dae-Won (Department of Internal Medicine, Cardiovascular Center, Seoul National University College of Medicine) ;
  • Oh, Byung-Hee (Department of Internal Medicine, Cardiovascular Center, Seoul National University College of Medicine) ;
  • Park, Young-Bae (Department of Internal Medicine, Cardiovascular Center, Seoul National University College of Medicine)
  • Published : 2011.10.30
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Abstract

Background and Objectives: The aims of this study were to establish a reliable model of chronic mitral regurgitation (MR) in rats and verify the pathophysiological features of this model by evaluating cardiac function using serial echocardiography and a pressure-volume analysis. Materials and Methods : MR was created in 37 Sprague-Dawley rats by making a hole with a 23 gauge needle on the mitral leaflet through the left ventricular (LV) apex under the guidance of transesophageal echocardiography. Results: Serial echocardiograms revealed that the LV began to dilate immediately after the MR operation and showed progressive dilation until the 14th week (LV end-systolic dimension at 14 weeks, 4.71${\pm}$0.25 mm vs. 6.81${\pm}$0.50 mm for sham vs. MR, p<0.01; LV end-diastolic dimension, 8.32${\pm}$0.42 mm vs. 11.01${\pm}$0.47 mm, p<0.01). The LV ejection fraction tended to increase immediately after the MR operation but started to decrease thereafter and showed a significant difference with the sham group from the 14th week (70.0${\pm}$2.2% vs. 62.1${\pm}$3.1% for sham vs. MR). In a pressure-volume analysis performed at the 14th week, the LV end-systolic pressure-volume relationship and +dp/dt decreased significantly in the MR group. A serial treadmill test revealed that exercise capacity remained in the normal range until the 14th week when it began to decrease (exercise duration, 406${\pm}$45 seconds vs. 330${\pm}$27 seconds, p<0.01). A pathological analysis showed no significance difference in interstitial fibrosis between the two groups. Conclusion: We established a small animal model of chronic MR and verified its pathophysiological features. This model may provide a useful tool for future research on MR and volume overload heart failure.

Keywords

References

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