[Molecular mechanisms of individual platelet reactivity in hematuria secondary to lithotripsy]

To investigate the mechanisms of individual platelet reactivity to ADP and adrenaline associated with the variability of hematuria after lithotripsy in patients with chronic obstructive pyelonephritis (COPN).

The study included 41 COPN patients admitted to the Department of Urology for lithotripsy (LT). The contact ultrasonic LT was performed using the Karl Storz Calcuson Ultrasonic Lithotripsy System. Postoperative hematuria was assessed by microscopic red blood cell count. Platelets were separated from the citrated peripheral blood by centrifugation. Platelet aggregation was measured by Chrono-log aggregometer using agonists (ADP, adrenaline) at a concentration of EC50 and EU10.

There were three types of platelet functional response to ADP and adrenaline after LT (increased, unchanged and decreased aggregation), but the predominant type of individual response was increased platelet aggregation. Testing 24 hours after LT revealed 7 platelet phenotypes differing in functional activity of 2-adrenoceptor agonist and purine receptors (R2Y1 and R2Y12). Normal purine receptor activity was associated with the ability of platelets to respond to adrenaline by increasing the functional activity aimed at limiting hematuria. Reduced platelet response to ADP after LT reaching the level of hyporesponsiveness may be viewed as a predictor of severe hematuria after surgery.

Individual platelet reactivity, manifested by the interaction of ADP and adrenaline agonist, determines the effectiveness of the increase in pro-aggregation capacity of platelets in developing postoperative hematuria.