Device-induced platelet dysfunction in patients after left ventricular assist device implantation

Area of Science:

• Cardiovascular Surgery
• Hematology
• Biomedical Engineering

Background:

• Non-surgical bleeding (NSB) is a significant complication following left ventricular assist device (LVAD) implantation.
• Non-physiological shear stress from LVADs may alter platelet function, leading to bleeding disorders.

Purpose of the Study:

• To investigate the combined role of platelet receptor expression and oxidative stress in LVAD patients with and without NSB.
• To compare platelet characteristics between patients with and without coagulation disorders post-LVAD.

Main Methods:

• A prospective, monocentric study involving 39 LVAD patients (19 bleeders, 20 non-bleeders).
• Quantification of platelet receptors (PECAM-1, GPIbα, P-selectin, CD63, GPIIb/IIIa) and reactive oxygen species (ROS) using flow cytometry.
• Evaluation of platelet aggregation capacity via aggregometry.

Main Results:

• Bleeder group showed decreased surface expression of P-selectin and GPIbα.
• Reduced mean fluorescence intensity of ADP-stimulated P-selectin and PECAM-1 in bleeders.
• Higher intraplatelet reactive oxygen species (ROS) production observed in patients with NSB.

Conclusions:

• Altered expression of GPIbα, P-selectin, and PECAM-1, along with elevated oxidative stress, are implicated in bleeding complications after LVAD implantation.
• These findings may elucidate the mechanisms behind spontaneous hemorrhage in LVAD patients due to impaired platelet function.