Intra-aneurysmal pressure after incomplete endovascular exclusion

Area of Science:

• Biomedical Engineering
• Vascular Surgery
• Medical Device Research

Background:

• Endoleaks, incomplete exclusion of aneurysms during endovascular repair, pose a significant clinical challenge.
• Understanding the hemodynamic consequences of endoleaks is crucial for predicting aneurysm sac behavior and rupture risk.

Purpose of the Study:

• To develop an experimental model for analyzing hemodynamic changes within an aneurysm sac in the presence of endoleaks.
• To investigate the impact of simulated endoleaks of varying sizes and the presence of collateral branches on intrasac pressure.

Main Methods:

• A latex aneurysm model connected to a pulsatile pump was used to measure systemic and intrasac pressures.
• Experiments were conducted with simulated endoleaks (3.5-mm, 4.5-mm, 6-mm orifices) and without (control).
• Pressures were recorded with and without a patent aneurysm side branch to assess its influence.

Main Results:

• Intrasac diastolic and mean pressures were significantly elevated compared to systemic pressures across all endoleak groups.
• The pressure curves within the sac showed damping despite the elevated pressures.
• A patent side branch significantly reduced intrasac diastolic and mean pressures.

Conclusions:

• Even small endoleaks result in intrasac pressures significantly exceeding systemic pressures.
• Elevated intrasac pressure is a potential risk factor for aneurysm rupture.
• While patent side branches mitigate intrasac pressure, aggressive management of endoleaks is recommended.