Thrombotic response to mechanical circulatory support devices.

Area of Science:

• Biomaterials Science
• Cardiovascular Engineering
• Hemostasis and Thrombosis Research

Background:

• Mechanical circulatory support (MCS) devices are crucial for cardiovascular support but frequently induce thrombosis and hemostatic disorders.
• Antithrombotic medications, while necessary, increase bleeding risks and do not fully resolve thrombosis, impacting patient survival.
• MCS thrombosis results from complex interactions between patient factors, device biomaterial properties, and hemodynamic conditions.

Purpose of the Study:

• To review how biomaterial surface properties (roughness, topography, chemistry, wettability, coatings) and hemodynamic factors (flow, shear stress, activation) influence thrombosis in MCS devices.
• To highlight current and proposed design strategies for MCS devices aimed at minimizing thrombotic responses.
• To identify knowledge gaps and suggest future research directions for developing safer, next-generation MCS devices.

Main Methods:

• Literature review focusing on the interplay between biomaterial properties, hemodynamic forces, and thrombotic events in MCS.
• Analysis of established biological, chemical, and physical mechanisms underlying thrombosis in relation to device design.
• Synthesis of current and proposed design strategies for mitigating MCS thrombosis.

Main Results:

• Specific biomaterial surface characteristics and hemodynamic flow patterns significantly affect thrombosis, platelet activation, and coagulation.
• Design strategies targeting surface properties and flow dynamics offer potential to reduce thrombotic complications.
• Despite advances, a deeper understanding of localized thrombotic processes and combined material-flow effects is needed.

Conclusions:

• Optimizing biomaterial properties and hemodynamic flow conditions in MCS device design is critical for reducing thrombosis.
• Future research should focus on mechanistic insights into localized thrombosis and the synergistic effects of material and flow.
• Testing novel biomaterials and geometries under clinically relevant conditions is essential for developing safer MCS devices.