Evidence for a storage pool defect in platelets from cirrhotic patients with defective aggregation

Area of Science:

• Hematology
• Hepatology
• Platelet Physiology

Background:

• Cirrhosis is associated with impaired hemostasis.
• Defective platelet function is a known complication of advanced liver disease.

Purpose of the Study:

• To investigate the mechanisms of defective platelet function in cirrhotic patients.
• To compare platelet function in patients with mild and severe cirrhosis against healthy controls.

Main Methods:

• Studied 11 cirrhotic patients with mild disease, 20 with severe cirrhosis, and 31 controls.
• Measured platelet aggregation, adenosine triphosphate, 5-hydroxytryptamine, beta-thromboglobulin, and platelet factor 4 content.
• Assessed plasma beta-thromboglobulin-platelet factor 4 ratio as an index of in vivo platelet activation.

Main Results:

• Significantly reduced platelet aggregation in cirrhotic patients compared to controls.
• Severe cirrhosis group showed significant reductions in adenosine triphosphate, 5-hydroxytryptamine, beta-thromboglobulin, and platelet factor 4.
• Elevated plasma beta-thromboglobulin-platelet factor 4 ratio observed in severe cirrhosis patients, indicating in vivo platelet activation.

Conclusions:

• Cirrhosis leads to a platelet storage pool defect.
• This defect in platelet function may contribute to the increased bleeding tendency observed in cirrhotic patients.