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Ovine Model of Ischemic Mitral Regurgitation

  • Dae-Hee Kim
  • Brittan Morris
  • J. Luis Guerrero
  • Suzanne M. Sullivan
  • Judy Hung
  • Robert A. Levine
Protocol
Part of the Methods in Molecular Biology book series (MIMB, volume 1816)

Abstract

Ischemic mitral regurgitation (IMR) is a common complication of ischemic heart disease that doubles mortality after myocardial infarction and is a major driving factor increasing heart failure. IMR is caused by left ventricular (LV) remodeling which displaces the papillary muscles that tether the mitral valve leaflets and restrict their closure. IMR frequently recurs even after surgical treatment. Failed repair associates with lack of reduction or increase in LV remodeling, and increased heart failure and related readmissions. Understanding mechanistic and molecular mechanisms of IMR has largely attributed to the development of large animal models. Newly developed therapeutic interventions targeted to the primary causes can also be tested in these models. The sheep is one of the most suitable models for the development of IMR. In this chapter, we describe the protocols for inducing IMR in sheep using surgical ligation of obtuse marginal branches. After successful posterior myocardial infarction involving posterior papillary muscle, animals develop significant mitral regurgitation around 2 months after the surgery.

Key words

Mitral regurgitation Myocardial infarction Sheep Echocardiography Tethering Papillary muscle 

Notes

Acknowledgments

This study was supported in part by NIH grants R01 HL128099 and HL141917, and by support from the Ellison Foundation, Boston, MA.

Supplementary material

Movie 1a

Movie clips of baseline (normal) short axis images (a, b) and posterior infarction with PM involvement (c, d, and e). The PM does not contract; not moving toward the center in short axis (c, d) and the base in long axis (e) (MP4 520 kb)

Movie 1b

Movie clips of baseline (normal) short axis images (a, b) and posterior infarction with PM involvement (c, d, and e). The PM does not contract; not moving toward the center in short axis (c, d) and the base in long axis (e) (MP4 537 kb)

Movie 1c

Movie clips of baseline (normal) short axis images (a, b) and posterior infarction with PM involvement (c, d, and e). The PM does not contract; not moving toward the center in short axis (c, d) and the base in long axis (e) (MP4 550 kb)

Movie 1d

Movie clips of baseline (normal) short axis images (a, b) and posterior infarction with PM involvement (c, d, and e). The PM does not contract; not moving toward the center in short axis (c, d) and the base in long axis (e) (MP4 541 kb)

Movie 1e

Movie clips of baseline (normal) short axis images (a, b) and posterior infarction with PM involvement (c, d, and e). The PM does not contract; not moving toward the center in short axis (c, d) and the base in long axis (e) (MP4 714 kb)

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Copyright information

© Springer Science+Business Media, LLC, part of Springer Nature 2018

Authors and Affiliations

  • Dae-Hee Kim
    • 1
    • 2
    • 3
  • Brittan Morris
    • 4
  • J. Luis Guerrero
    • 4
  • Suzanne M. Sullivan
    • 4
  • Judy Hung
    • 3
  • Robert A. Levine
    • 3
  1. 1.Cardiac Imaging Center, Asan Medical CenterCollege of Medicine, University of UlsanSeoulKorea
  2. 2.Division of Cardiology, Asan Medical CenterCollege of Medicine, University of UlsanSeoulKorea
  3. 3.Cardiac Ultrasound Laboratory, Massachusetts General HospitalHarvard Medical SchoolBostonUSA
  4. 4.Surgical Cardiovascular LaboratoryMassachusetts General Hospital, Harvard Medical SchoolBostonUSA

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