Detection of microplatelet formation using an electroimpedance cell counter.

Changes in the platelet size distribution curves during the process of ADP-induced aggregation were observed using a particle distribution analyzer (PDA) based on electronic impedance. The maximum primary aggregation was seen at a final ADP concentration of 3 microM. After stimulation, the platelet distribution curve changed rapidly from a log normal curve to a curve skewed to the left. When the changes were evaluated at 1 min after the addition of ADP, the peak height was increased, and the median and total volume were decreased significantly. These findings indicate that microplatelets are formed by membrane stimulation and this formation can be monitored with the use of this automated instrument.