Abstract
Abdominal aortic aneurysm (AAA) is an irreversible bulge in the artery with higher prevalence among the elderlies. Increase of the aneurysm diameter by time is a fatal phenomenon which will lead to its sidewall rupture. Invasive surgical treatments are vital in preventing from AAA development. These approaches however have considerable side effects. Targeted drug delivery using microbubbles (MBs) has been recently employed to suppress the AAA growth. The present study is aimed to investigate the surface adhesion of different types of drug-containing MBs to the inner wall of AAA through ligand-receptor binding, using fluid-structure interaction (FSI) simulation by using a patient CT-scan images of the vascular system. The effect of blood flow through AAA on MBs delivery to the intended surface was also addressed. For this purpose, the adherence of four types of MBs with three different diameters to the inner surface wall of AAA was studied in a patient with 40-mm diameter aneurysm. The effects of the blood mechanical properties on the hematocrit (Hct) percentage of patients suffering from anemia and diabetes were studied. Moreover, the impact of variations in the artery inlet velocity on blood flow was addressed. Simulation results demonstrated the dependency of the surface density of MBs (SDM) adhered on the AAA lumen to the size and the type of MBs. It was observed that the amount of SDM due to adhesion on the AAA lumen for one of the commercially-approved MBs (Optison) with a diameter of 4.5 μm was higher than the other MBs. Furthermore, we have shown that the targeted drug delivery to the AAA lumen is more favorable in healthy individuals (45% Hct) compared to the patients with diabetes and anemia. Also, it was found that the targeted drug delivery method using MBs on the patients having AAA with complicated aneurysm shape and negative inlet blood flow velocity can be severely affected.
Highlights
Abdominal aortic aneurysm (AAA) is one of the most common types of cardiovascular diseases (CVDs) occurring in the middle part of the aorta
The effect of surface density of MBs (SDM) adhesion on AAA was addressed in the last cardiac cycle
The SDM adhesion was compared with other effective drug delivery parameters such as MBs kinetic energy (MKE) and MBs residence time (MRT)
Summary
Abdominal aortic aneurysm (AAA) is one of the most common types of cardiovascular diseases (CVDs) occurring in the middle part of the aorta. Micro- and nanoparticles have drawn a considerable deal of attention in the field of the targeted drug delivery[15,16,17] In this content, particles with optimised diameter and the shape have been designed to increase the adhesion and the migration ability to the target site[18,19]. Studies have shown that the geometry of the vessel, velocity and pressure of blood are the key parameters in optimisation of the particles shape and size. It can affect the migration and adhesion of particles to the targeted surface[12]. No study was found concerning the effect of MBs size and type (two factors with significant roles in adhesion to the artery wall). The surface density of MBs (SDM) on lumen AAA, average MBs residence time (MRT) and the effects of forces exerted on MBs on delivery to the targeted surface were examined
Sign-in/Register to view highlights & summary Sign-in/Register to access full text options 
Free) 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a call
