Surgical ventricular restoration for rabbit dilated cardiomyopathy model: Preliminary study

Area of Science:

• Cardiology
• Veterinary Medicine
• Surgical Innovation

Background:

• Dilated cardiomyopathy (DCM) is a prevalent cardiovascular condition in canines, typically managed with beta-blockers.
• A critical need exists for alternative therapeutic strategies for DCM, particularly those addressing structural cardiac abnormalities.

Purpose of the Study:

• To assess the efficacy of surgical ventricular restoration in a rabbit model of daunorubicin-induced dilated cardiomyopathy.
• To evaluate the impact of surgical intervention on left ventricular (LV) function and structure.

Main Methods:

• A daunorubicin-induced DCM model was established in six rabbits.
• Left ventricular reconstruction surgery was performed using prosthetic sheets and polypropylene sutures.
• Echocardiography was used to assess LV function preoperatively and 3 weeks postoperatively.

Main Results:

• Significant improvements were observed in LV internal dimension at end-diastole and end-systole post-surgery.
• Fraction shortening improved from 23.8% to 30.9%, and ejection fraction increased from 35.3% to 51.9%.
• Histopathological examination revealed a thinner LV wall and fibrosis around the suture sites.

Conclusions:

• Surgical ventricular restoration led to significant improvements in LV volume and function in this preliminary study.
• The findings suggest potential for surgical ventricular restoration as a treatment for DCM.
• Further research is necessary to ascertain the long-term efficacy and safety of this surgical technique.