Progression Toward Decompensated Right Ventricular Failure in the Ovine Pulmonary Hypertension Model

Area of Science:

• Cardiovascular Research
• Pulmonary Hypertension Models
• Animal Studies

Background:

• Decompensated right ventricular failure (RVF) in pulmonary hypertension (PH) is a critical clinical challenge with limited therapeutic options.
• Developing novel mechanical circulatory support systems for RVF necessitates a robust large animal model that accurately reflects human pathophysiology.
• Previous work established a sheep model of PH via pulmonary artery ligation and occlusion.

Observation:

• This study details a case of acute decompensation within the established chronic RVF sheep model.
• Progressive pulmonary artery banding induced significant right ventricular pressure elevation (95/56 mmHg).
• Physiological compensation was observed for seven weeks before rapid decline.

Findings:

• Decline in mixed venous saturation and marked creatinine increase indicated systemic compromise.
• Development of subcutaneous edema and eventual expiration occurred by week 10.
• Post-mortem analysis revealed significant findings including pleural effusion, ascites, RV dilatation, eccentric hypertrophy, and myocardial fibrosis.

Implications:

• This case validates the sheep model for studying RVF secondary to PH, closely mimicking human disease progression.
• The model's fidelity supports its utility in advancing the development of novel devices and therapeutic interventions for RVF.
• Further research utilizing this model can accelerate innovation in treating severe pulmonary hypertension and right heart failure.