Sex-related differences in platelet aggregation in native whole blood

Area of Science:

• Hematology
• Cardiovascular Research

Background:

• Discrepant reports exist regarding sex-related differences in platelet aggregation (PA).
• Understanding these differences is crucial for personalized medicine, particularly concerning antiplatelet therapies like acetylsalicylic acid (ASA).

Purpose of the Study:

• To investigate sex-related differences in platelet aggregation using a novel impedance method in native whole blood (NWB).
• To compare NWB impedance results with citrated whole blood (CWB) and turbidometric methods (TM).
• To assess the impact of acetylsalicylic acid (ASA) on sex-related PA differences.

Main Methods:

• Platelet aggregation (PA) was measured using impedance methods in native whole blood (NWB) and citrated whole blood (CWB).
• Results were compared with the turbidometric method (TM).
• Stimuli included collagen, adenosine diphosphate (ADP), sodium arachidonate (NaAA), and epinephrine.

Main Results:

• In NWB, collagen- and ADP-induced PA were stronger in women than men, similar to TM, indicating citrate is not the sole cause.
• This sex difference in collagen-induced PA persisted after 125 mg ASA, suggesting a potential reason for greater ASA therapeutic benefit in men.
• The impedance method in NWB demonstrated higher sensitivity to collagen, ADP, and NaAA compared to CWB and TM. Epinephrine-induced PA was not reliably tested by impedance methods.

Conclusions:

• Sex-related differences in platelet aggregation exist and are not solely attributable to citrate.
• The greater therapeutic benefit of ASA in men may be partly explained by sex-based differences in collagen-induced PA response.
• The novel NWB impedance method offers enhanced sensitivity for certain PA inducers, but limitations exist for others like epinephrine.