Pathophysiologic Consequences of Early Coarctation Stenting in a Longitudinal Porcine Model

Area of Science:

• Cardiovascular Research
• Interventional Cardiology
• Pediatric Cardiology

Background:

• Novel stent technologies offer early intravascular treatment for coarctation (COA).
• Long-term cardiovascular responses to early COA stent interventions remain undefined.

Purpose of the Study:

• To investigate longitudinal cardiovascular changes in a porcine model of COA with early stent implantation and serial dilation.
• To assess the efficacy and safety of stenting in treating COA in a preclinical setting.

Main Methods:

• Surgical COA was induced in 2-week-old swine.
• Stent implantation followed at 6 weeks, with serial dilations at 12 and 20 weeks.
• Control groups included shams and COA without stenting; all animals were studied terminally at 20 weeks.

Main Results:

• Stenting successfully eliminated COA and prevented post-stenotic dilation and collateralization.
• Stent shortening led to descending aorta narrowing distal to the stent and decreased vessel wall collagen.
• Peri-stent aneurysms occurred in 4 of 6 animals, requiring covered stents; however, hemodynamics and ventricular function were near-normalized.

Conclusions:

• Early stenting with serial dilation effectively achieved adult aortic dimensions and prevented adverse hemodynamic and myocardial remodeling in a COA model.
• Stent-induced descending aorta narrowing and aneurysm formation highlight the need for optimized stent design or additional interventions.
• Altered systemic arterial elastin content was observed, warranting further investigation into long-term vascular effects.