Initial effects of the left ventricular repair by plication may not last long in a rat ischemic cardiomyopathy model

Circulation. 2001 Sep 18;104(12 Suppl 1):I241-5. doi: 10.1161/hc37t1.094522.


Background: Long term effects of left ventricle (LV) repair surgery (LVR) for ischemic cardiomyopathy are not well understood.

Methods and results: Sixty-nine rats developed ischemic cardiomyopathy with large akinetic LV area 4 weeks after the left anterior descending artery was ligated. In a second surgery 4 weeks later, 33 rats underwent LVR by plication of the akinetic LV area (LVR group), and 36 underwent rethoracotomy alone (sham group). No medication was used in either group. All rats survived the second surgery. LV end-diastolic dimension as measured by echocardiography, LV fractional shortening, and the maximal end-systolic pressure-volume relationship (E(max)) as calculated from the data by catheter-tipped manometer and echocardiography improved in the LVR group after the second surgery, but LV end-diastolic dimension and E(max) gradually deteriorated as time passed. LV end-diastolic pressure improved 1 week after LVR but rose significantly 4 weeks after LVR. Brain natriuretic peptide mRNA was lower in the LVR group than in the sham group 1 week after LVR but not 4 weeks postoperatively.

Conclusions: Initial improvement in LV function and neurohormonal status after LVR did not last for 4 weeks in this rat model when untreated medically. The mechanism of deterioration should be elucidated to improve long-term results of LVR.

MeSH terms

  • Animals
  • Cardiac Surgical Procedures*
  • Cardiomyopathies / complications
  • Cardiomyopathies / physiopathology
  • Cardiomyopathies / surgery*
  • Disease Models, Animal*
  • Disease Progression
  • Echocardiography
  • Heart Ventricles / diagnostic imaging
  • Heart Ventricles / physiopathology
  • Heart Ventricles / surgery*
  • Hemodynamics
  • Male
  • Myocardial Ischemia / complications
  • Myocardial Ischemia / physiopathology
  • Myocardial Ischemia / surgery*
  • Myocardium / metabolism
  • Natriuretic Peptide, Brain / genetics
  • Natriuretic Peptide, Brain / metabolism
  • RNA, Messenger / metabolism
  • Rats
  • Rats, Sprague-Dawley
  • Stroke Volume
  • Time
  • Treatment Failure
  • Ventricular Dysfunction, Left / complications
  • Ventricular Dysfunction, Left / diagnosis
  • Ventricular Dysfunction, Left / physiopathology


  • RNA, Messenger
  • Natriuretic Peptide, Brain